Category Archives: Shortwave Radio Reviews

A review of the Elad FDM-S2 software defined receiver

FDM-S2-Front

The following review originally appeared in the November 2014 issue of The Spectrum Monitor magazine.


At the Dayton Hamvention this year, I made it a special point to check out the Italian radio manufacturer, Elad.

Although I’ve known about Elad and their products for some time, and often found them intriguing, I hadn’t yet investigated Elad’s offerings simply because I was under the impression they sold and warrantied their equipment only within Europe. Indeed, this was the case…until just recently. Elad has now begun shipping–and supporting–their products within the US, via their division Elad-USA. Thus my renewed interest in Elad at the Hamvention.

Elad-Dayton-Hamvention

At their Hamvention booth in the East Hall of Hara Arena, the Elad staff gave me a superb table-tour of their array of products. Indeed, I was completely unaware of the broad scope of Elad’s product offerings, which include antenna switches, antenna splitters, test equipment, and, of course, software defined radios (SDRs). Their current SDR offerings are as follows: the Elad FDM-S1, the FDM-S2, and the newly released FDM-DUO. The FDM-DUO is actually a transceiver, while the “S” line is receive-only.

Elad-Radios

Among Elad’s SDRs, I found myself most interested in the FDM-S2 receiver; a quick demo at their booth caught my interest, as I instantly liked the GUI (graphical user interface), the features, and the specifications of this model. I requested that Elad provide the loan of this SDR for review, and they kindly complied.

Unboxing and installing the Elad FDM-S2

FDM-S2-Box

Contents of the FDM-S2 box are few and simple: the FDM-S2 receiver, a black cloth carrying bag, and a 4GB USB drive with installation software and documentation are enclosed. A standard USB cable was also included in the shipping box.

FDM-S2-Box-Contents

I found installation of the S2 to be fairly straightforward. I would encourage new owners to follow the included guide, since installation is a two-part process:

  • First, you install a C++ package on your Windows PC. When complete, this triggers the actual Elad software installation, a two-part installation that you initiate only once.
  • Secondly, you install the USB driver for the FDM-S2, found in the installation folder of the supplied software. Note: at present, the USB driver cannot be automatically discovered and installed by your PC–you must initiate this installation via the device manager. However, this is very easy: the guide takes you through the process step-by-step.

On the back of the FDM-S2 you’ll find an HF and VHF SMA antenna ports, a USB port, serial interface, and on/off switch.

FDM-S2-Back

The FDM-S2 derives its power from the same USB cable that is used for data; no separate external power supply is required–a huge plus, for those of us who like to travel.

Once I installed the software and driver, I hooked up my antenna to the HF SMA connector on the back, turned on the FDM-S2, and launched the application. The FDM-S2 clicked to life, and the application ran on the first go–very nice!

Scope of this review: application

Reviewing an SDR is challenging, especially with a third-generation SDR like the FDM-S2. There are nearly an infinite number of setting combinations for gain control, filters, demodulation, audio, even color schemes; covering all of these is beyond the scope of a basic review such as this, or indeed, virtually any review. In addition, the FDM-S2 can be used with several third-party SDR applications. Therefore, for the sake of this review, I decided to limit myself to evaluating the Elad application that ships with the FDM-S2. In addition, in this evaluation I attempted to retain many of the settings that come as defaults in the Elad application, to support new users. Finally, I limited myself to evaluating the shortwave bands.

After installing the Elad application, I spent a good hour or so familiarizing myself with the software. It’s quite a departure from the WinRadio Excalibur, SDR-IQ, and Microtelecom Perseus applications with which I’m most familiar. There is a modest learning curve involved with using the Elad FDM-S2–it took a good hour with the application to feel relatively comfortable with its functionality. But the trade-off is much more customization and functionality than one can achieve with the Perseus or WinRadio software, for example.

First impressions

Elad-FDM-S2-FrontPanel

First, let me begin by saying that new users will greatly benefit from reading the owners manual and join the Elad Yahoo group. If you’re attempting something that the owner’s manual does not cover, most likely someone in the Elad forum has already posted the answer. Elad’s engineer, Franco, also actively monitors and responds to requests on the Yahoo group.

Once on, the FDM-S2 defaults to the frequency of 0 Hz. Indeed, the Elad software uses Hz as the unit of measure for frequency, so any frequency entered must be in Hz: for example, to enter 9,420 kHz, you must key in 9420000, then press “Enter.” As a shortcut, you can enter 9420 and the “+” key on your number pad which will automatically add the trailing “000.” I found that a bit unusual in the beginning as most SDR software defaults to kHz, but after using the FDM-S2 for a few minutes, it became second nature.

There are several ways of tuning the FDM-S2:

  • Frequencies can be directly keyed in (as described above)
  • You can click on a frequency in the spectrum and waterfall windows (if the center frequency isn’t locked)
  • You can use the scroll wheel on your mouse like a tuning wheel, to scan up or down
  • You can use the arrow keys on your keyboard (left/right are defaults with up/down controlling tuning steps)
  • With your mouse pointer, you can click and drag one of the three horizontal tuning bars at the bottom of the window
TuningBars

Tuning Bars: Click to enlarge

I find it easiest to tune by using the horizontal tuning bars to move to a particular meter band, then locking the center frequency and use the scroll wheel on the mouse to scan in 1 or 5 kHz increments. This makes tuning feel like the experience I’m most used to with other SDRs. I must say that I really like the horizontal tuning bars; these make it quite easy to quickly center on a meter band.

I would also note that I’m favorably impressed with the S2’s waterfall and spectrum display; not only can you customize the colors via the settings window, but you also have the options to embed timecode in the waterfall and to display broadcaster information from the frequency database in the spectrum.

FullScreenShot-FourRX

The FDM-S2 has a total of four “virtual receivers,” labeled RX1, RX2, RX3 and RX4. Depending on the receiver configuration and bandwidth you’ve chosen in the S2’s device configuration (see below), you can use each virtual receiver simultaneously. Each receiver can have its own filter settings and modes selected–your only limitation is that each of the four receivers must be tuned within the FDM-S2’s bandwidth.

FDM-S2 receiver bandwidth configurations

The S2 currently has seven receiver configurations:

  • 1 Channel 192 kHz bandwidth
  • 1 Channel 384 kHz bandwidth;
  • 1 Channel 768 kHz bandwidth;
  • 1 Channel 1,536 kHz bandwidth;
  • 1 Channel 3,072 kHz bandwidth;
  • 1 Channel 6,144 kHz bandwidth; and
  • 2 Channels 384 kHz bandwidth.

If you set the S2 to a total bandwidth of 192 kHz in one channel, all four of your virtual receivers are limited to that 192 kHz area. This is a great configuration if you plan to listen to a single broadcaster at a time, and don’t need to see so many signals within the spectrum display. It’s also an excellent configuration to save storage space if you wish to record a relatively small chunk of IF spectrum.

FDM-S2-DeviceSettingWindow

If you choose the 6,144 kHz bandwidth, you can use each of the four virtual receivers simultaneously within the bandwidth. For example, on Saturday evenings I could tune RX1 to the Voice of Greece on 9,420 kHz; RX2 to The Mighty KBC 7,375 kHz; set RX3 to search for pirates around 6,925-6,975 kHz; and listen to the 40 or 30 meter ham radio bands on RX4. All at once! [Note: in the screenshot above, each virtual receiver is marked in the spectrum with a green, yellow, red or blue vertical marker.]

The two-channel 384 kHz option is also a powerful and unique feature of the S2. With this configuration selected, you can have two completely independent receivers with 384 kHz of bandwidth, each. Though this may be more radio than you need, each receiver has four virtual receivers of its own. That’s a whopping 8 virtual receivers!

Most of the time, I keep the configuration set to 1,536 kHz, unless I want to listen in two different meter bands at once. At 1,536 kHz, I can record spectrum and capture a full broadcast band to play back later. I’ve even recorded 6,144 kHz of spectrum, and played it back with no hiccups on my Intel i5 PC, although it did chew through a lot of storage space (roughly 2 GB of data per minute of recording). That equates to 120 GB per hour–but the result is a recording of everything between, say, 4 and 10 MHz. For shortwave radio archiving this is a most impressive capability!

DRM

While Digital Radio Mondiale (DRM) is not the most popular mode on the shortwave broadcast bands, DRM is built into the FDM-S2; there is no need to purchase a separate license or plugin as with most SDRs. If you’ve never listened to DRM, you might be surprised by the impressive listening results.

Within the first few days of using the FDM-S2, I was simply blown away by the DRM signal lock I achieved with Radio New Zealand International. Indeed, I’ve found that the FDM-S2 provides the most stable DRM decoding locks of any other receiver I’ve tested to date.

Here is a two hour audio sample of the FDM-S2 recording RNZI DRM:

Audio Player

[On a side note: It simply boggles my mind when I realize that this RNZI broadcast originates from a transmitter some 8,400 miles (13,518 km) from my receiver. Regardless of what one thinks about the future or utility of DRM, this is nothing short of magical in my book.]

Note that only the first virtual receiver, “RX1,” employs the DRM mode. This is important to note, as I find I’ve sometimes finished listening to a DRM broadcast, turned off the FDM-S2, then when I turned it back on later, initially wondered why I was hearing no audio on strong AM signals. I had inadvertently left the DRM mode engaged–user error only, in this case. Just something to be aware of.

DRM-Window-FDM-S2-Review

But finding a DRM broadcast is very easy with the Elad software; there is a dedicated button that appears when the DRM mode has been selected. When you press the schedule button, it will load all of the DRM broadcasts from the HFCC schedule. You can simply scroll through this list and click on a frequency to find an audible DRM broadcast. So far, on the FDM-S2, I’ve decoded RNZI, Radio Exterior de Espana, and even All India Radio from my QTH in eastern North America. Not bad!

Recordings

One of the reasons I latched onto the FDM-S2 at the Dayton Hamvention this year was that I immediately saw the potential of the S2 as a recording receiver. Besides posting recordings on the SWLing Post, I also actively make recordings for the Shortwave Radio Audio Archive, so no surprise that one of the first functions I evaluated on the FDM-S2 was its recording capability.

There are two recording modes: AF and Full Span Input Spectrum. You switch between modes in the Recording tab of the Settings window. After the settings have been saved, you simply locate the broadcast or chunk of HF spectrum you wish to record, and press the red record button located on the screen’s bottom left quadrant.

The Elad application also gives you a great degree of control for automatically naming the recorded files; mine is currently set up to embed the frequency, date, time, and device in the filename.

There are few things I’ve reported to Elad as possible improvements for recording:

I do wish that it wasn’t necessary to open the settings window to switch between bandwidth configurations and recording modes (IF or AF); my Excalibur has all of this on the front panel, which is more convenient. While there is a more direct way of opening the recording settings window–simply right click on the red record button–I think it would be preferable to at least have the option of including the information on the main user interface. Also, when you stop a recording, the receiver turns itself off; this obviously needs to be corrected. Fortunately Elad has noted these concerns and plans to address them in future software updates.

Additionally, I’ve noted that while one can record either IF or AF, both can’t be recorded at the same time, a lacking shared, incidentally, by the Microtelecom Perseus. While I probably do more recording than most SWLs, I frequently record both spectrum and an individual broadcast simultaneously on the WinRadio Excalibur. I hope Elad will consider adding this to their software, as well.

Performance

Features are always nice to play with, and the FDM-S2 is chock-full of them–but most important are your receiver’s ability to detect faint signals, block adjacent ones, as well as cope with unpredictable conditions.

Elad-FDM-S2-BackPanel

The FDM-S2 has a wide frequency coverage: 9 kHz-52 MHz, 74-108 MHz, and 135-160MHz. It’s one of the few SDRs on the market that doesn’t need a module or add-on for FM and VHF coverage. It has separate SMA connectors for HF and VHF antennas. While I have not thoroughly tested beyond the HF bands as of this writing, but many experienced FM DXers tout the S2’s abilities in their own reviews, and I don’t doubt them.

On the shortwave bands, the S2’s performance has impressed me: this SDR has remarkably excellent sensitivity and selectivity. Indeed, its performance is on par with my WinRadio Excalibur, and surpasses that of my RFSpace SDR-IQ, no mean feat. I have made many A/B comparisons with my Excalibur on weak signals; the two receivers are nearly indistinguishable. I’ve conducted blind-listening tests on weak signals (much like those described here) and found that the two recordings were nearly identical. On occasion, I might favor one receiver’s AGC over the other in a recording, but a slight tweak to the AGC settings could readily fix any discrepancies.

Herein lies the difficulty of reviewing an SDR’s performance–the user has so much power to control variables and thus shape the receiver’s function, that it’s hard to make an “apples-to-apples” comparison. But clearly, the Elad holds its own.

Noise reduction

While I’m not a great fan of digital noise reduction, the Elad software has a variable noise reduction feature that I admit to have used on several occasions. I found that by increasing it to approximately 10-20%, audio characteristics of an AM signal were mostly preserved while noise was effectively mitigated. This is where the S2 has a distinct advantage over the Excalibur which has no noise reduction feature.

AM Synchronous detection

With that said, the Excalibur has an edge on the S2 when it comes to blocking adjacent signals. At the time of review, I’m using version 1.12 of the Elad software, which lacks a selectable AM sync detector–a powerful tool to block noise, which may only be present in one sideband of an AM broadcast. Elad engineering tells me that they have this feature planned for a future software update.

Flexibility

Remarkably enough, the FDM-S2 can actually be used with a number of third-party SDR applications. The FDM-S2 comes with Winrad EXTIO Dlls compatible format: all software based on Winrad derivatives (like HDSDR and Studio1) work, and have been tested by S2 users. So if I really need sync detection, for example, I can simply find and use another SDR application to run the S2.

Indeed, flexibility may be among the most powerful features of the S2. If for any reason you don’t like the Elad application, you can simply use another one.

Summary

Invariably, all radios have strengths and weaknesses; here is a list of my notes from the moment I put the S2 on the air:

Pros

  • Beautiful, rich audio fidelity via headphones or my amplified speakers
  • Excellent sensitivity
  • Excellent selectivity (which would be enhanced with USB/LSB selectable sync–see con)
  • Low noise floor
  • Four virtual receivers: RX1, RX2, RX3, and RX4
  • Superb DRM decoding built-in, no additional license key or plug-in purchase required
  • Noise reduction is quite effective with few digital artifacts, even at low levels
  • Tasteful waterfall and spectrum displays
  • Wonderfully rapid tuning via horizontal tuning bars
  • Power derived from USB port (no external power supply needed)
  • Separate HF/VHF antenna ports
  • Ability to embed and record UTC time in waterfall display
  • Can display schedule information in waterfall and spectrum
  • ES2 supported by third-party OEM and open-source SDR applications; not confined to Elad application (as tested)
  • Small form factor/footprint, convenient for travel or limited shack space
  • Networking features for remote receiver control (not tested)
  • Iterative agility: application/firmware updates influenced by customer feedback
  • Great value–$300 less than most of its competitors

Cons

  • Recording cannot be fully controlled from the front panel; to adjust most settings, you must do so via a separate settings window
  • Receiver turns off completely after stopping a recording (Elad plans to fix this)
  • AM sync currently lacks USB/LSB selectivity
  • Elad application has steeper learning curve than other OEM SDR applications
  • Though highly customizable (see pro), changing color schemes requires patience and practice
  • Some reports from users indicate that sensitivity may be compromised if you live near a blowtorch AM station
  • IF and AF recordings cannot be made simultaneously; AF recordings cannot be made from an IF spectrum recording without a virtual audio cable application (similar to the Microtelecom Perseus)

Elad-FDM-S2-FrontPanel

While the Elad FDM-S2 has some growing to do, I expect many of these concerns may be addressed in updates over time, and I look forward to trying the S2 with other SDR applications. I’m fairly confident that Elad is serious about their products’ iterative agility, which is to say, software development based on customer input. They’ve been responsive to email and active on the Elad Yahoo email discussion group, which indicates promise. I believe they’re serious about supporting the North American market as well as they even attended the 2014 Dayton Hamvention.

Frankly, at $580 US (via Elad USA) I think the FDM-S2 is quite reasonably priced, especially considering this SDR’s performance and features. After all, it’s only $80 more than the RFSpace SDR-IQ, while it is $300-400 less than the Microtelecom Perseus and WinRadio Excalibur. That’s good value, in my book.

But with each review, I always ask myself: “Would I buy it?”

For the Elad FDM-S2, the answer is, unhesitatingly, Yes! I intend to purchase the FDM-S2 from Elad immediately following the publication of this review. I believe it will make a fine addition to the shack–I can see myself using it often for travel, future DXpeditions, and, of course, shortwave radio archiving.

As always, the proof is in the pudding: look for my Elad FDM-S2’s coming contributions to the Shortwave Radio Audio Archive in the near future. And listen for yourself.

The SWLing Post 2014-2015 Shortwave Radio Buyer’s Guide

RadiosShootOut-SonyTecsunSangean

The following article originally appeared in the November 2014 issue of The Spectrum Monitor magazine.


Although many large government shortwave broadcasters are departing the shortwave radio scene, there’s no shortage of great products being introduced to it. Indeed, growth in the portable and SDR (software defined radio) markets is reasonably rapid.  This suggests, perhaps, a new kind of future for shortwave.

The following is a basic, easy-to-follow buyer’s guide to some of the best receivers on the market. This guide is, by no means, comprehensive; rather it’s a selection of rigs I know or own, thus have tested.

Compact/Travel portables

If your budget is tight, or if you’re looking for a radio that could easily slip into your glove compartment, backpack, carry-on, or even jacket pocket, you need to look at an compact shortwave radio. Typically, there is a performance compromise with compact radios: they don’t typically have the sensitivity, like their more expensive cousins; they have a more limited frequency range; and they don’t detect single-sideband signals. Nonetheless, the ones listed here are fine performers for their size and price. Entries are listed in alphabetical order.

ccradio-swpCrane CCRadio-SWP

The CC Radio SWP has been on the market for many years and has become a classic portable. The layout and design are very simple, the display clear, with easily-read icons and intuitive controls. The tuning knob on the right side is for fine tuning–no muting or chugging between frequencies, either. Shortwave and MW sensitivity are better than one might expect for a radio this size; I often find myself comparing it to much pricier portables. But most significantly, this radio offers the longest battery life of any radio I own: almost 70 hours on 2 AA cells!

The CC Radio SWP is available from C.Crane for $55.00 US. You can also purchase the CC Radio SWP from Universal Radio ($44.95) and Amazon.com.

Note: The CC Radio SWP may soon be replaced by the new CC Skywave which has just started shipping at time of posting.

KA1103Kaito KA1103 or Degen DE1103

The Kaito KA1103 packs a lot of bang-for-your-buck if you’re looking for an inexpensive, ultra-portable entry into SWLing. Like the CC Radio SWP, the KA1103 (a.k.a. Degen DE1103) has enjoyed a long market life. The KA1103 is full-featured and one of the only sub-$100 radios with SSB mode. One interesting design feature of the KA1103 is its large Digital/Analog frequency display: the LCD screen features the frequency display in digits, but also sports a working digital representation of an analog frequency dial. As you tune up and down the band–with, yes, a tuning knob–the LCD needle moves along the display as it would on an analog radio dial. While I believe radio ergonomics could be improved, the KA1103 is still a great bargain.

The KA1103 is available at Universal Radio for $79.98 and Amazon.com for $79.99. Click here to search eBay for the Degen DE1103.

Tecsun PL-310ETTecsun PL-310ET

The Tecsun PL-310ET is an updated version of the acclaimed PL-310, a mini-legend in the world of portable radio, offering exceptional value and high-performance in a small package. The PL-310ET is fueled by a SiLabs DSP (Digital Signal Processing) chip that gives this ultra-portable excellent sensitivity and selectivity. The PL-310 has been a favorite amongst ultra-light Dxers, as sensitivity and selectivity are  exceptional for the price. The new “ET” version of the PL-310 sports ETM tuning; a feature which allows you to scan the entire band and automatically store all strong stations to temporary memory locations. I believe the updated PL-310ET also has better AGC for weak signal DXing than its predecessor. Another bonus is that the PL-310ET sports an external antenna jack for shortwave and FM reception.

The Tecsun PL-310ET is largely available from Hong Kong-based sellers on eBay (http://ebay.to/1seZP3h) as well as on Amazon.com.

Tecsun-PL-380Tecsun PL-380

The Tecsun PL-380 is my favorite radio under $60. Much like its cousin, the PL-310ET (above), the PL-380 has a DSP (Digital Signal Processing) chip that gives this ultra-portable excellent sensitivity and selectivity. For three years, I have traveled extensively with the PL-380 in tow, and I’m constantly amazed by this radio’s excellent audio and reception across the bands.

The Tecsun PL-380 is available from Universal Radio for $59.95 and from Amazon.com for $54.99. Click here to search eBay for the PL-380.

Tecsun offers a number of compact portables, based on a similar DSP chip as the PL-380, but with built-in stereo speakers. Check out the Tecsun PL-390, PL-398BT, and PL-398MP, too.

Full-Featured Portables

In the portables market, I believe you get the most value and quality in the $90-250 price class. Most beginners and seasoned SWLs prefer a radio that includes everything necessary to get on the air immediately; all of these radios provide just that. Straight out of the box, you’ll have everything you need to listen to shortwave bands. All of these recommended radios are designed to pick up major shortwave broadcasters with ease, and offer the following features: good frequency coverage; circuitry that helps in the detection of weaker stations; and the ability to receive single-sideband (with the exception of the CCRadio-SW, see below).

ccradio-swCrane CCRadio-SW

If you’re not as concerned about portability, the C.Crane CCRadio-SW is an excellent broadcast receiver. Think of the CCRadio-SW as a larger portable or tabletop radio (11.25″ x 7.25″ x 3.5″). What makes this radio stand out from its peers? Exceptional audio fidelity. The large built-in speaker has separate treble and bass controls and reminds me how important audio quality is while listening to a faint signal. This radio’s audio will fill a large room. Shortwave sensitivity is very good. Medium wave (AM broadcast) reception is excellent. Negatives? No direct keypad for frequency entry, and the SW also lacks a native SSB mode (a rare missing feature in this price class). With that said, it does have impressive array of external connections, including an IF-Out connection, which (with an IF converter and some free software) will allow you to interpret SSB and an array of digital signals, including DRM (Digital Radio Mondiale). What really strikes me about the CCRadio-SW is its sheer ease of use.  Its design is simple, ergonomic, and highly effective. I’ve often recommended the CCRadio-SW to listeners who want simplicity of use and robust audio.

The CCRadio-SW is available for $149.95 at C.Cranes’ website, $129.95 from Universal Radio and is also available on Amazon.com. Click here to check eBay for used models.

Radios with a similar form-factor include the Grundig S450DLX and the new Eton Field.

ATS-909XSangean ATS-909X

At $249.95, the Sangean ATS-909X is one of the priciest full-featured portables on the market. The 909X sports a large alpha-numeric display, tactile buttons, and a solid build quality. I also believe the 909X has a one of the better internal speakers and audio fidelity amongst portables. Negatives? Surprisingly, the 909X lacks synchronous detection, a tool most other portables have in this price range. Additionally, in my recent shortwave portable shoot-out, I gave the Sangean low marks for sensitivity; this review was based upon use of the built-in telescopic antenna. With an external antenna, on the other hand, the 909X performs admirably. If you’re looking for a quality portable with a front-end robust enough to be attached to a larger external antenna, the 909X may very well be your radio.

The Sangean ATS-909X is available at Universal Radio for $249.95 and Amazon.com for $219.99. Click here to search for used ATS-909Xs on eBay.

Sangean still has several models of portables available.  Check out the Sangean ATS-404 and ATS-505P.

Sony7600GRSony ICF-SW7600GR

For performance, you’ll find that the Sony ICF-SW7600GR is top of its class among full-featured portables. Two of its outstanding features is a solid synchronous selectable sideband (a feature which helps to reduce fading distortion and adjacent-channel interference) and stable AGC circuit. In fact, the ICF-7600GR was chosen as a favorite in a blind audio test on the SWLing Post. Indeed, my only criticism of the ‘7600GR is that it lacks a tuning wheel; instead, you’re forced to use tuning buttons on the front face of the radio.

The Sony ICF-SW7600GR is available at Universal Radio for about $150.00 and at Amazon.com for $130-150.00. Click here to search eBay for a used ICF-SW7600GR.

KX3-Helper-Tecsun-PL-600Tecsun PL-600

The Tecsun PL-600 is the value leader among the full-featured portables in this list. It can be found at a wide array of retailers, such as Universal Radio, Amazon and eBay. Price ranges from about $65 to $90. I’ve often recommended the PL-600 as a first full-featured radio for the budding SWL, and for good reason: the PL-600 has great sensitivity, selectivity, and even has capable single-sideband reception. The PL-600 does a surprisingly good job of holding its own against the other contenders in this list. Negatives? Like all sub-$100 portables, the PL-600 lacks synchronous detection (and if this is a deal-killer for you, check out the PL-660). Additionally, the PL-600 is not well suited for large external antennas; but it does work quite well with its own antenna. In a nutshell: if you’re not willing to spend over the $100 mark, the PL-600 is a safe bet.

The Tecsun PL-600 is available at Universal Radio for $89.95. Click here to search eBay for new and used PL-600s.

PL-660Tecsun PL-660

The Tecsun PL-660 is one of the best selling portable shortwave radios currently on the market–and for good reason. This rig has a full compliment of features and is quite easy to operate. The sync detector (selectable USB/LSB) is currently one of the best in the sub $150 US price range. Sensitivity and selectivity are both excellent; indeed, I consider it to have the most sensitive receiver among the portables listed here (and so. With the introduction of the Tecsun PL-880 on the market, the PL-660 has also become more affordable and can be found at or near the $100-120 price point with shipping. What a bargain!

The Tecsun PL-660 is available at Universal Radio for $109.95 and on Amazon.com (prices vary). Click here to search fro a new or used PL-660 on eBay.

Tecsun PL-880PL-880 (1)

The Tecsun PL-880 was introduced to the market one year ago (November 2013), and while the introduction was a bit bumpy (feature variation based on differing firmware versions), it has recovered and found quite a good following. While the PL-880 does not rank as highly as the PL-660 or ICF-SW7600GR in terms of sensitivity (see review TSM June 2013) it does have compensating factors.  For one thing, the PL-880 has the best audio fidelity from its internal speaker among the radios listed here. It’s also the most feature rich, boasting the most filter selections and a growing number of “hidden” features (http://wp.me/pn3uc-2tl). I also love the build quality, ergonomics, and tuning options; indeed, the PL-880 even has a dedicated fine tuning control. Negatives? Though the PL-880 has an undocumented sync detection among its “hidden” features, I find its sync lock quite feeble, compromising audio fidelity a bit too much. If you’re looking for a small portable that will fill a room with rich audio–whether you’re listening to the BBC, a classical concert, or just two ham radio operators chatting on 40 meters– look no further than the PL-880.

The Tecsun PL-880 is available at Universal Radio for $159.95 and on Amazon for $159.99. The Tecsun PL-880 is also available from Hong Kong-based sellers on eBay.

New Eton portables now shipping

Eton-SatellitAt time of publishing, Eton Corp–the North American distributor of Grundig–has four updated models of shortwave portables new to the market. All are updated versions of recently retired Grundig models:

If history is a guide, I expect all of these radios to prove worthy of the 2016 Shortwave Radio Buyer’s Guide. Indeed, preliminary reviews of the Field have been most favorable. Barring schedule changes, all models should be available in time for the 2014 holiday season…Stay tuned.

Tabletop receivers

While tabletop receivers have started to decline with the advent of SDRs, there are many listeners who still prefer a simple, dedicated, stand-alone high-performance receiver with a good tuning knob and clear display, which is to say, a tabletop receiver. Tabletops are designed to perform best with a resonant external antenna.

AlincoDXR8TFrontFaceAlinco DX-R8T

I reviewed the Alinco DX-R8T in 2011 a few months after it was introduced. I was favorably impressed with the DX-R8T. So much so, I purchased one after the review. It has excellent selectivity and sensitivity, a large display and tuning knob, a detachable faceplate (if your desktop space is limited), and a decent built-in speaker. What’s more, the DX-R8T has an SDR mode that allows you to hook up the receiver to your PC to see a spectrum display, and with an optional accessory cable, control its rig functions and tuning. The DX-R8T requires a regulated 12-volt power supply (not included). Cons? The DX-R8T lacks a selectable synchronous detector–a feature I enjoy using to combat adjacent signal interference.

The Alinco DX-R8T is available at Universal Radio for $449.95. Click here to search eBay for the Alinco DX-R8T.

Icom-R-75Icom R-75

Various versions of the Icom R75 have been on the market for well over a decade.  This receiver stands the test of time because it’s a full-featured tabletop with attributes like twin passband controls, a two-level pre amp, separate AF/RF gain, adjustable AGC, an alpha numeric display, a direct frequency entry keypad, not to mention a logical, ergonomic layout for all controls.  Amateur Radio operators, pirate radio listeners, as well as utility broadcast listeners will all appreciate the R75’s performance in SSB mode. Cons? The current base version of the R75 lacks synchronous detection, though some models in the past have had this option.

The Icom R75 is available at Universal Radio for $669.95. Click here to search eBay for the R75.

SDRs/IF Receivers

If you’re searching for maximum performance for the price, software-defined radios (SDRs) and IF receivers are hard to beat. These small “black box” radios require a computer to unlock their performance; none of these are stand-alone. But while I’ve never been a fan of combining my PC with radio listening, once I starting using an SDR, I never turned back.  Now, 90% of the time that I’m on the air, it’s with an SDR. They’re simply incredible.

The following selection of SDRs–and IF receivers–are all available for $1,000 or less.

BonitoRadioJetDaytonBonito RadioJet IF-Receiver 1102S

The Bonito RadioJet is included in this group because it is very similar to an SDR, but strictly speaking, it’s an IF receiver. Like an SDR, it requires a PC for operation. But while the RadioJet’s spectrum bandwidth is more limited than the SDRs that follow, it has advantages over the others.  For one, the RadioJet is more akin to a PC-controlled radio–most of the hard work is done in the receiver itself, not your computer–-so even older model Windows PCs, tablets and netbooks can run the  RadioJet application with ease. The RadioJet is great for travelers since it requires no external power supply: it derives its power from your computer, from the same USB cable used for data. The RadioJet is an excellent receiver and has a very low noise floor. If you like listening to DRM, you’ll be impressed with its native ability to decode the mode. Click here to read my comprehensive review of the RadioJet.

The Bonito RadioJet 1102S is available at Universal Radio for $649.95. The RadioJet can also be purchased directly from Bonito in Germany.

Elad-FDM-S2-CoffeeElad FDM-S2

If you’ve read my Elad FDM-S2 review (coming soon!) you’ll know that this little SDR packs a powerful punch for the price. Indeed, I would venture to say that the FDM-S2 offers the best value among the SDRs listed here. Its performance is uncompromising, comparing favorably to receivers $300-400 more in price. The S2 also provides native DRM decoding.  In short, the S2 makes for a fine DRM receiver.

Any negatives with this rig? Some users have reported diminished receiver performance in the presence of high-powered AM stations (fortunately, not an issue in the rural area where I live). Additionally, the Elad application has a greater learning curve than, say, the Perseus or the Excalibur (below). Still, I like the S2 so much that even though I already own a benchmark SDR, I’m planning to purchase the S2 after review.

The Elad FDM-S2 is available at Elad USA for $580.00.

PerseusMicrotelecom Perseus

If you’re looking for a benchmark SDR, it’s hard to overlook the venerable Microtelecom Perseus. Though it’s been on the market for many years now, the receiver architecture holds its own and is as robust as they come. Selectivity and sensitivity are absolutely superb: no matter the mode or band. Another benefit of the Perseus is that users can network their receivers with relative ease, sharing them with other Perseus users. Negatives? The Perseus price point still tops the charts at $1000. And while the supplied application works quite well, it lacks features found in other SDR apps, and the window cannot be resized (though numerous customer requests have been made). Still, the Perseus is likely to remain a DXer’s receiver of choice for years to come.

The Microtelecom Perseus is available at Universal Radio for $999.95. Click here to search eBay for a used Perseus.

WinRadio Excalibur

I have owned the WinRadio Excalibur since 2012, and it has become my primary home receiver. I have directly compared the Excalibur to the Microtelecom Perseus and the Elad FDM-S2 (above); any receiver performance differences are minor. As a radio broadcast archivist, I find the Excalibur to be the best receiver suited to capturing broadcasts, as it’s the only one in this group that can record up to 2 MHz of radio spectrum (and allow you to play back this recording later); up to three broadcasts can be captured simultaneously within that 2 MHz window. Negatives? The Excalibur application only works on Windows PCs. Additionally, it requires a dedicated 12V power supply, thus is less convenient than the RadioJet or FDM-S2 for travel and outdoor listening. Read my full review of the Excalibur by clicking here.

The WinRadio Excalibur is available directly from WinRadio for $945.95. Click here to search eBay for a used Excalibur.

Hybrid Stand-Alone SDR/Tabletops

The CommRadio CR-1

CommRadio CR-1a

The CommRadio CR-1a could be classed as either an SDR or a stand-alone tabletop receiver, as it fits both profiles. Furthermore, the CR-1a is as portable as nearly any of the portable radios mentioned above. In short, I really dig this radio! It’s beautifully engineered and mil-spec rugged; performance-wise, it’s hard to beat. Receiver sensitivity and selectivity are superb. The best part? The CR-1a has an optional internal battery that will power it for hours on a single charge. With antenna and fully-charged CR-1a, you will enjoy hours of outdoor listening while traveling [check out my recent travel review]. If you’re on the fence about getting an SDR or tabletop radio, grab the CR-1a; at $599.95, it’s a lot of kit for your investment. Click here to read my comprehensive review of the CR-1.

The CommRadio CR-1a is available from Universal Radio for $599.95 and directly from CommRadio for $599.99. Click here to search eBay for a used Comm Radio CR-1 or CR-1a.

The Shortwave Radio Index

If you would like to view a comprehensive list of all shortwave radios currently on the market, check out the Shortwave Radio Index (http://swling.com/db).

Shoot-out results: Top ultra-portable shortwave

Tecsun-ShootOutThanks to all who participated in our ultra-portable shoot-out! A little over a week ago, I posted recordings of shortwave broadcasts, weak and strong, in an attempt to evaluate which recording–thus which radio–our listeners prefer. I conducted this test on the three radios pictured above: the Tecsun PL-310ET, the CountyComm GP5/DSP (Tecsun PL-360), and the Tecsun PL-380–among the most popular ultra-portables currently on the market. This test was “blind” in the sense that all three radios evaluated were merely labeled “Radio 1,” “Radio 2,” and “Radio 3,” respectively.

The samples

To refresh your memory, I’ve embedded the audio samples below for you to hear; but if you haven’t yet heard them, I encourage you to read our previous post before doing so. (If you’re already heard the recordings, simply skip this section.)


Global 24 – 9395 kHz (Strong)

Radio 1

Audio Player

Radio 2

Audio Player

Radio 3

Audio Player

ERT Open/ Voice of Greece (Relatively strong)

Radio 1

Audio Player

Radio 2

Audio Player

Radio 3

Audio Player

Radio Riyadh (Weak)

Radio 1

Audio Player

Radio 2

Audio Player

Radio 3

Audio Player

Rádio Bandeirantes (Very weak)

Radio 1

Audio Player

Radio 2

Audio Player

Radio 3

Audio Player

And now…the results!

The following chart shows how each radio scored out of a total of 106 (wow!) survey responses:

ShootOutRadios

Let’s start with the radio that scored lowest in this contest…

Radio 3: the CountyComm GP5/DSP (a.k.a., the Tecsun PL-360)CountyCommGP5DSP

Interestingly, the GP5/DSP consistently came in last in every category. I think a few factors outside of receiver performance led to this.

For some reason, the recorded audio of the GP5/DSP sounds out-of-phase.  Several of you noted this. The resulting sound almost mimics a “stereo” effect. No matter how many times I made recordings on the GP5/DSP, this feature predominated, and I eventually assumed it to be characteristic of this radio’s DSP.

But I’m wondering now, however, if there might be oxidation on one of the headphone jack conductors, or if the headphone jack on my unit is somehow faulty–?  Because of this, before conducting the medium wave shoot-out, I’ll try to clean the conductors with a little Deoxit to see if it makes a difference.

Unlike the PL-310ET and PL-380, the GP5/DSP can’t change AM bandwidths. On the strong recordings, I widened the bandwidths of the PL-310ET and PL-380 to 6 kHz; this improved their audio fidelity. On weak signals, I narrowed the bandwidth to 3 or 4 kHz, keeping both at the same level as I did so. While the GP5/DSP’s fixed bandwidth is well chosen, it simply couldn’t compete with the wider filters of the other two radios on strong signals.

Though the GP5/DSP (Tecsun PL-360) came in last, the irony is that most people who made comments on the survey form actually mentioned that the GP5/DSP was also a strong contender. Here are a few responder’s comments:

  • “The bassiness of Radio 1 was pleasing to listen to, but the clarity of radio 3 was also pleasing. All three sounded very good.”
  • “I was divided–Radio 1 seemed to provide the better audio on the stronger stations (not as muddy) yet Radio 3 beat it out on the weak stations and seemed to hold the station steadier (less fading) thereby providing a better audio to hear and understand.”
  • “I think if I were to place these three radios in order of “listening pleasure” based on the provided samples, my order would be 3, 1, 2.”
  • “By a small margin Radio 3 seemed to have the best signal to noise ratio and general audio quality across the range of signal strengths.”

Also notable:  the GP5 has one very distinct advantage over the other two radios, something that wouldn’t have been noticed in this test: its ETM function, which scans the whole band then automatically stores stations to temporary memory, is almost two times faster that that of the other radios. It also seemed to be equally accurate.

So, who would buy the CountyComm GP5/DSP (Tecsun PL-360)? Someone who likes this radio’s form factor, it’s stable AGC, and quick ETM scanning. Keep in mind, we are comparing this model with two of the best radios under $60, in my opinion. Had we compared the GP5 with most other sub-$60 radios, it might have won that shoot-out, and with ease.

Click here to purchase the CountyComm GP5/DSP. [Note that the new CountyComm GP5/SSB should be available soon–I plan to review it shortly thereafter.]

Radio 2: The Tecsun PL-380

Tecsun-PL-380

The Tecsun PL-380 came in a very consistent second place in this shoot-out.

The ‘380 is one of my favorite portables on the market; for many years, it has been my go-to radio for one-bag travel.

Before recording the shoot-out, I guessed that the PL-380 might take first place. But up to this point, I had never actually compared it with either of the two other radios in this shoot-out. Listening to the blind samples, I tend agree with the results.  Still, the PL-380 is a great value and a fun little radio, one I can still easily recommend for travel.

Click here to search for the Tecsun PL-380 on Amazon.com, click here for eBay and click here for Universal Radio.

Radio 1: The Tecsun PL-310ETTecsun PL-310ET

As you can see from the graph, the Tecsun PL-310ET won our shoot-out in every category–and by a fairly wide margin:

UltraPortableShootOut

While comparatively few participants’ comments were specific to the PL-310ET (“Radio 1”), it’s interesting that these most often made note of this radio’s very close resemblance to the PL-380 (“Radio 2”).

The PL-310ET had only a slight advantage over the PL-380 to my ear, but it was enough; so along with most survey respondents, I took note of that advantage.

Now, I know this much: when people ask me whether they should purchase the PL-380 or PL-310ET, I think I’ll suggest the PL-310ET. In the end, it makes for a better travel radio because it also has an external antenna jack, one of the few sub-$60 radios that has this useful feature.

In summary, the Tecsun PL-310ET is truly a fantastic ultra-portable radio, and, at $48 – 52 US, it’s a real bargain, to boot.

Click here to search for the Tecsun PL-310ET on Amazon.com, click here for eBay.

Coming soon…our medium wave shoot-out!

When I find the time in the next month or so, I plan to test the same radios in a medium wave (AM) shoot-out. Weak-signal medium wave will put AGC circuits and internal ferrite antennas center stage. Please be patient, however, as these tests actually take time to put together and evaluate.  Again, your participation will be most welcome!

Video: Tom reviews the Eton Traveller III

The Eton Traveler III

The Eton Traveler III

I just discovered that SWLing Post reader, Tom Stiles, has made a video review of the new Eton Traveller III:

Tom is a great fellow (usually posts as “Another Tom” in our comments!) and has an extensive collection of radio related videos on his YouTube channel. Thanks, Tom!

Mega Review: the Tecsun PL-880, PL-660, Sangean ATS-909X, and Sony ICF-SW7600GR go head-to-head

This article, which extensively reviews–and compares–the Tecsun PL-880, PL-660, the Sangean ATS-909X, and the Sony ICF-SW7600GR, originally appeared in the June 2014 issue of The Spectrum Monitor Magazine. Without a doubt, it’s my longest and most comprehensive review to date.


AllFourRadios

Summer:  time for travel–and for portable shortwave DXing. As I mentioned in the March TSM issue, I love combining travel with shortwave radio listening. But what radio should I pack?

This time of year, on the SWLing Post, I receive an increase in the number of queries asking some variation of the following, “What is the best, full-featured, portable shortwave radio on the market?” Oftentime it’s an upcoming trip, or just some time off work, that prompts the question, but without a doubt, this is the most-often-asked question from my readers. Typically, the reader has several models in mind and is curious how they compare. And since a good portable radio costs between $100 – $230 US, it’s not an impulse purchase decision for most of us.

In this month’s column, I hope to answer this question as thoroughly as possible so you can make an informed purchase decision that’s right for you. All four radios I mention in this article are what I would call “flagship portables” (generally, these are the best portables from any particular manufacturer). These were recently featured in a highly-energized reader survey on the SWLing Post, and are as follows: the Tecsun PL-660, the Tecsun PL-880, the Sony ICF-SW7600GR, and the Sangean ATS-909X.

AllFourRadiosInLine

The price tags for these radios fluctuate, but all are generally available between $100-$230 US, and are actively in production right now.

Moreover, all these radios have a similar form factor: they are portable enough to be operated handheld, sport a direct-frequency entry keypad, a dedicated external antenna jack, and a generous backlit display. All of them also have SSB, and all but one have selectable sideband synchronous detection.

The competitors

With the exception of the Sangean ATS-909X–on loan from a friend for the purposes of this review–I have easily spent 40+ hours of listening time with each of these radios. I know their individual characteristics quite well and have used them in a variety of situations.

In case you’re not familiar with each of the contenders, a brief summary of each radio follows with an overview of the features that make it unique.

Sangean ATS-909X

ATS-909X

If there was an award for the best-looking radio, I think the ATS-909X would win. The 909X designers put a great deal of thought behind the design and ergonomics of the 909X; for instance, there are two indentations on the back of the radio which allow it to fit nicely in your hands.  The 909X sports an internal speaker that produces excellent audio fidelity with a crisp response and even some distinct bass notes, especially notable if listening to an FM station. Of all of the radios listed here, the 909X has the the best variable receiver gain, tone control, largest display, and is the only radio with RDS (Radio Data System).

909X-Grip

While I like the position of the tuning wheel on the front of the radio, which is ideal for tuning with your thumb and reminiscent of the ICF-SW55, I don’t like the indents you feel as you tune. If you’re a listener that takes advantage of radio memory, the ATS-909X has a very appealing feature: alpha-numeric memory tags. When you store a Radio Australia frequency to memory, your 909X can display the full station name in large, easy-to-read characters.

909Xdisplay

There is one omission from the 909X, though, that I find a bit surprising: it has no synchronous detection. While I don’t use a sync detector all of the time, it does come in handy when fading (QSB) and adjacent signal interference (if the sideband is selectable) are present.  For a radio that costs over $210 US, on average–the priciest on this list, by a long shot–I feel like sync should have been a given.

Sony ICF-SW7600GR

Sony7600GR

The Sony ICF-SW7600GR comes from a series of “7600” portables that date back to 1977. Though the ’7600GR has all of the modern features one would expect for a radio in its price class, it’s a bare-bones receiver in this particular crowd. It lacks the advance memory functions of the PL-880, PL-660 and, especially, the 909X. The display is smaller and more basic, although it does provide the most vital information.

I have traveled extensively with the ’7600GR, however, as it has rock-solid, reliable performance; it’s my work horse and go-to radio for field recordings because I find its AGC and sync detector remain among the best in this class of radio. It also has a dedicated, stable line-out jack. Important controls are all accessible, and I can easily engage the key lock without fear of accidentally pressing the wrong button during the recording.

SonyKeypad

My main gripe about the ’7600GR, however, is its lack of a tuning knob and overall poor ergonomics.  My personal preference is to use a tuning knob for band-scanning, as pressing buttons just doesn’t give the same sense of responsiveness.  For casual tuning and band-scanning, I leave the ’7600GR in its case.  Nor is this radio intuitive–indeed, to learn all but the most obvious functions of the ’7600GR, you’ll need to reference the owner’s manual. Audio from the ’7600’s internal speaker is average/unremarkable.

Still, my Sony ’7600GR’s solidity makes it a friend I would never part with.  The real test? If it was ever lost or broken, I would promptly repair or replace this radio.

Tecsun PL-660

PL-660

Though I’m often an early adopter of new shortwave portables, I wasn’t for the Tecsun PL-660. When it came out, I figured it would be redundant, considering the many other portables I own with synchronous detection.

Long story short:  I was wrong.

Having at last acquired the Tecsun PL-660 last year, I now know it’s a pleasure to operate, and feature-rich for its price. The PL-660 is the bargain in this bunch of benchmark rigs, and significantly so: at an average price of $105 US currently, it is easily half the price of the ATS-909X.

The PL-660 is a pleasure to operate, and a true performer.  Its selectable synchronous detector is one of the best in this group of portables: it’s on par with the Sony ICF-SW7600GR. It locks onto a station and rarely loses that lock. Ergonomics are excellent on the PL-660, too–the buttons have a tactile response, are well marked, and all functions are simple to find. The right side-mounted tuning knob has a smooth action.

The Tecsun PL-660 has been on the market since 2011 and has a dedicated following amongst SWLs, many of whom favor it above anything else in its class.

Of course, the PL-660 isn’t perfect, however. It lacks a line-out jack, something I find essential for recording shortwave broadcasts. The audio from the internal speaker is okay, but not on par with the ATS-909X, or its cousin, the PL-880 (below). Still, at $105 US, the PL-660 is truly a steal.

Tecsun PL-880

PL-880 (1)

The Tecsun PL-880 only started shipping in November 2013. It was highly anticipated as the new flagship portable in the Tecsun line. The PL-880 is chock-full of features and without a doubt, is the most complicated portable I’ve ever reviewed.

The PL-880 feels like a quality piece of kit: its buttons have a highly-tactile response, the tuning/volume wheels are silky smooth, and feel well-engineered. Out of the four portables evaluated here, I find the PL-880 the most pleasurable to operate. One of my favorite features is its dedicated fine-tuning knob, just below the main tuning knob on the right side of the radio.

PL-880-RightSide

Unquestionably, the one feature which makes the PL-880 highly desirable is the amazing audio fidelity you’ll enjoy from its built-in speaker: it’s well-balanced, rich, and clear. I almost can’t emphasize this point enough–the PL-880’s speaker is capable of room-filling audio. It’s one of the few radios I’ve ever owned (other than some of my antique tube radios) that encourage listening to shortwave from across the room, with pleasing results.

The PL-880 also sports the most filter options of any other portable on the market. Indeed, in SSB mode, the filter can be narrowed all the way down to 500 hz, making this CW operator, at least, quite contented.

Cons? Yes, the PL-880 has some. First of all, I feel like its current firmware version leaves room for improvement. One of the first things I had to do after receiving my radio was adjust the muting threshold so that it wouldn’t engage. Many of the PL-880’s adjustments are mysteriously hidden, even undocumented in the manual. One such hidden feature is its synchronous detection, which is the least refined in this set of portables: it has difficulty maintaining a stable lock, thus audio is significantly compromised.

[Click here for our comprehensive (and growing) list of PL-880 hidden features.]

Changing settings often results in the radio “thinking” for a second or two, during which time it mutes the receiver. This phenomenon is most pronounced when changing modes (from AM to LSB, for example). I find it rather distracting.

Still, I do like the PL-880. Its audio and overall quality make up for any annoyances. I suspect it will have a long product life and a loyal following over the coming years.

Evaluating performance

AllFour-LeftSideLine

Since I’m listening to the shortwaves 90% of the time I’m listening to a radio, I’ve limited the scope of my assessment here to the shortwave bands. With that said, none of these radios will disappoint you on AM or FM. I did note in my simple home comparison that the Sangean ATS-909X seemed to be the leader on the FM band.  The Tecsuns were perhaps best on the AM (mediumwave) band.

But what about on shortwave? I like using recordings to evaluate shortwave radio performance, typically representative clips that are 25-60 seconds in length. Why? Anytime I have more than two radios to compare, it gets difficult to switch between radios, insuring that I give each one the same opportunity to receive a station. More importantly, with this method, I can listen to the audio clips on my computer, and flip between them quickly to determine characteristics I like in each.

Before recording, I set each radio in the same spot on a table, though I might change the orientation for optimal reception (since this can differ from one radio to another). I then extend the antennas fully and set all of the filters, gain controls, tone, volume levels, and frequencies to the same position on each rig.  This way, my comparison can be on an “apples-to-apples” basis.

Note that I do not use an external antenna in any of these tests. This because I believe, when considering portables, they should be able to function very well off of their built-in antennas–thus taking into account situations in which employing an external antenna is not practical.

So that you have an opportunity to evaluate each radio in a “blind” test, I’ll tag each audio sample with a number, the order of which will not necessarily be consistent in each consecutive test. After the clips, I’ll reveal which is which.

Strong Signals

FourRadiosAbstract2

When I evaluate relatively strong broadcasts I typically listen for the best audio fidelity and signal stability a radio can offer. Unless there’s an adjacent signal (and in this case, there was not), I open the filter as widely as possible.

One of the strongest stations in my part of the world is Radio Havana Cuba–not always the cleanest signal, but always at blowtorch power levels. In this sample clip, I tuned our four radios to RHC.

To be fair, propagation from this station was poor the day of recording, so you’ll hear a little fading that is not normally present. Additionally, you’ll want to listen to the full clip, as a portion of each contains RHC interviews that were recorded by telephone (thus “tinnier” sounding); you’ll also hear the typical RHC transmitter hum:

Sample #1

Sample #2

Sample #3

Sample #4

You’ll hear that all of these receivers–with the exception of Sample #3–are nearly identical. Sample #3 is less sensitive than the others, thus more prone to shallow fading and a slightly higher noise level. To my ears, Sample #4 has the best audio quality and receiver characteristics, followed by Sample 2 and Sample 1.

Now let’s reveal the radios behind the samples:

  • Sample #1: the Tecsun PL-660
  • Sample #2: the Sony ICF-SW7600GR,
  • Sample #3: the Sangean ATS-909X, and
  • Sample #4: the Tecsun PL-880.

Weak signal DX

AllFour-RightSide

I like comparing radios while listening to weak signals and/or when conditions are less favorable. Since I often listen to weak signals (after all, so few broadcasts are actually directed to North America), it’s an important test.

I found a weak signal from Radio Romania International on 11,975 kHz. Normally, the signal would have been much stronger, but propagation was rough and QSB (fading) pronounced at times. Under these conditions, you get the opportunity to hear how the receiver’s AGC circuit handles fading and troughs, how the noise floor sounds as conditions change, and judge the overall sensitivity.

While I give priority to a receiver’s sensitivity and selectivity, there’s obviously more to evaluate here–for example, the more sensitive radio may be less pleasing to the ear.

If you like, jot down what you observe as you listen to each 50 second clip:

Sample #1

Sample #2

Sample #3

Sample #4

Obviously, the radio in Sample #4 is significantly less sensitive than the other radios–it truly struggled to hear the RRI signal under these conditions.

The other radios were able to hear RRI. Sample #3 sounded fine when there was no fading present, but in the fading troughs, there was a pronounced high-pitched noise–most likely a DSP-based noise. Sample #1 had pretty solid copy with stable AGC (automatic gain control). Sample #2 was the most sensitive of this bunch.

Now let’s reveal the radios behind the weak signal samples:

  • Sample #1: the Sony ICF-SW7600GR,
  • Sample #2: the Tecsun PL-660,
  • Sample #3: the Tecsun PL-880, and
  • Sample #4: the Sangean ATS-909X.

In this particular test, I was most impressed with the PL-660’s sensitivity, but given the choice, I would have chosen the Sony ICF-SW7600GR as the best overall. Why?

The Sony produced audio simply more pleasant to my ears due to the stability of the AGC.

Wondering if others would draw a similar conclusion, I posted the same clips above on my blog, the SWLing Post (http://wp.me/pn3uc-2pl).  I doubted whether many readers would take the time to listen, or to vote, in this blind test. Boy, was I wrong–!

I received about seventy responses by email and in the comments section of my post. All but a very few readers ranked the clips in order of preference. The Sony was the clear favorite, with a total of 40 votes as the best of the bunch. The Tecsun PL-660 was second, with a total of 23 votes as the best. No one voted the PL-880 as best. (Click here for full results: http://wp.me/pn3uc-2qH)

What became very clear from the results and the comments, however, was that people who prefer sensitivity, prefered the PL-660. People who preferred stability, preferred the ’7600GR. In a sense, both were “best,” simply depending on the listener’s preference and/or listening requirements.

Weak single-sideband (SSB)

AllFour-LeftSide

To test the SSB performance of these radios, I tuned to W1AW as they worked a pile-up from Puerto Rico. You will hear some fading. For those of you not familiar with SSB listening, you should note that W1AW sounds a little “grainy” in all of these recordings; this is simply the audio processor on W1AW’s transceiver which is set to be most audible and punch through the static.

Sample #1

Sample #2

Sample #3

Sample #4

W1AW is barely audible in Sample #1. In Sample #2, audio is well-balanced, with good audio, low noise, and a stable AGC. Sample #3 sounds more narrow (even though its filter, like all, was set to the widest setting), but the audio “pops out” of the static and is very intelligible. Sample #4 sounds much like Sample #2, perhaps slightly more sensitive but with slightly less stable AGC.

By now you may have guessed each radio behind these samples…Here’s the lowdown:

  • Sample #1:  the Sangean ATS-909X,
  • Sample #2:  the Sony ICF-SW7600GR,
  • Sample #3:  the Tecsun PL-880, and
  • Sample #4:  the Tecsun PL-660.

I believe the Tecsuns perform best in this category, even though the difference between the two models is pretty dramatic. The PL-880 has the best sensitivity in SSB–indeed, I could have probably lowered the gain on my recorder and made the background noise sound even less pronounced, but I wanted the levels to match the other receivers. I was somewhat surprised its 5 kHz filter sounded so narrow on SSB.

The Tecsun PL-660 had the most pleasant audio, but during QSB peaks, its audio would suffer a little distortion (you only hear this once in this sample, near the end of the recording). The Sony had slightly less sensitivity, but the most stable AGC.

Once again, the Sangean ATS-909X struggled to hear the signal, having the least sensitivity of the group.

A note about the Sangean ATS-909X

909Xkeypad

Alas, the most disappointing radio in all of these tests is the Sangean ATS-909X.

To be fair, however, it’s worth noting that the Sangean performs admirably if connected to an external antenna. Again, I resisted connecting an external antenna in this particular series of tests because I believe a good portable radio’s performance should first be judged upon what it can receive with only its telescoping whip antenna, considering that, when traveling, it’s not always possible to use an external antenna.

Indeed, if you plan to buy a portable that will be hooked up to an external antenna more often than not, the Sangean ATS-909X may be a good choice for you. Its front end can handle external antennas better than most of the radios above (with the Sony as an exception, in my experience).

Syncronous detection

I did not test sync detection, as the Sangean ATS-909X lacks a sync detector and the Tecsun PL-880’s sync detector leaves much to be desired. But many hours of listening to the Sony ’7600GR and the Tecsun PL-660 leads me to conclude that their sync detectors are fairly comparable in performance.

So, how do you translate these results?

Although all of these receivers are considered best in the portable realm for a particular manufacturer, each has a character that suits individual listening skills or requirements.

Herein lies the difficulty offering advice on which portable to purchase. Because radio listening tends to be a solitary hobby, it comes down to personal preference–like choosing a friend. What one person values may matter very little to someone else.

For example, I rarely (if ever) save stations to memory on a permanent basis. Other than temporary auto-tuning memory features, I never give memory functions any weight when making a purchase decision (for myself, that is). Yet there are listeners who place a great deal of emphasis on memory functions.

To be perfectly honest, I think each one of these radios has an individual character that makes it a stand out for a particular type of listening.  While I often sort through my collection to give away radios that I seldom use, you won’t find me letting go of any of these rigs. The Sony ICF-SW7600GR is still my favorite portable for field recordings; its stable nature and robust front end mean that I can hook up long wire antennas if I wish. The PL-880 is the radio I reach for if want robust sound and armchair listening to shortwave and mediumwave–I also find it the best of the bunch to tune, a quality machine harkening back to the glory days of Panasonic and Sony. The PL-660 is my simple, bullet-proof performer–when in doubt of conditions, it’s the radio I reach for. If I owned the Sangean ATS-909X, it would probably become my bedside shortwave; its audio fidelity, large display, stable back stand, and ability to benefit from an external antenna make it very appealing for this purpose.

You can’t go wrong with any of these benchmark performers, so long as you know its weaknesses and strengths–which I hope this review has made clear.

If I had to choose just one of these radios…

FourRadiosAbstract

I’m forcing myself answer this question. While it’s difficult to answer, I believe if I could only have one of these radios for travel…I would chose the Tecsun PL-660. I find it the best overall performer, and a true bargain at its price point.

To be clear, if the Sony ICF-SW7600GR only had a tuning knob, it would be my choice, instead.  If the Tecsun PL-880 handled weak broadcast signals better, it might be my choice.

But this is my personal choice; you might have a completely different answer.  I guess that’s the point I made earlier–it all depends on the listener.

Now…which do you choose? 

Mechanically-tuned portable DSP radios: a shootout

Three of the five contenders: The Degen DE32, Degen DE321 and Tecsun R-2010D (Click to enlarge)

Three of the five contenders: The Degen DE32, Degen DE321 and Tecsun R-2010D (Click to enlarge)

Following is my premiere shortwave radio column for the January 2014 issue of The Spectrum Monitor digital magazine.  It takes the form of a review–or “shoot-out,” if you will–of a few select mechanically-tuned DSP radios I’ve tested over the years.

While I’m a big fan of print publications, digital publications like TSM offer me flexibility that I can’t get in traditional print: namely, shorter time to publication (thus more up-to-date information) and especially, the ability to embed links and audio as I do here on The SWLing Post. In this case, I’m able to include audio clips which the reader can utilize to compare the radios firsthand (embedded here, as well).

Note: This being my first contribution to a brand new magazine, I thought it would be fitting to begin by explaining why I still believe in shortwave radio…I mean, how could I resist? I guess I’ll always be a shortwave evangelist at heart.

Hope you enjoy.


First:  why I still believe in shortwave

SP600Dial3While I’ve been blogging about shortwave for several years now, I simply can’t tell you how many times I’ve received an email asking doubtfully, “This seems like a fun hobby, but isn’t shortwave radio dead?”

My response?  No way!  Here’s why.

I once had the truly good fortune to be interviewed by Gareth Mitchell, host of the BBC World Service technology program Click. For once, I made a point of listening to this interview that featured me––always a bit embarrassing––but after all, this was the BBC World Service!

But Gareth’s lead-in to our segment about my shortwave radio-based charity, Ears To Our World (ETOW), truly surprised me:  our non-profit, he said, “distributes portable battery powered devices that can stream audio in real time, all via an intuitive touch interface.”

Wow…how true.  And since that interview, this is exactly how I see shortwave radio, too: not as a forgotten relic of the past century, but as a medium at home in the future with a unique, highly accessible, and yet global reach.  Shortwave radio, after all, requires no apps, no subscriptions, and no mobile phone or Internet connection to deliver information worldwide at the speed of light.

All you need––in short––is a radio.

Shortwave lives!

This column exists to prove to the doubtful that shortwave radio––indeed, radio in general––is not only alive and well, but loud and clear in urban as well as rural settings the world over.   Here, you’ll find in-depth articles that reflect the changing state of shortwave radio:  the technologies, the techniques, and the vast array of content currently available across the shortwave radio spectrum. Best yet, because SWLing (shortwave listening) is what you make of it, you can be part of it:  share your input, so that I can cover (and uncover) shortwave topics you wish to discuss.

So I begin this first column with a little comparison––a shootout––between five newly-popular analog DSP radios.  Let’s find out who’s left standing.

The contenders

We’ll be pitting five models against each other here: the Degen DE321, the Degen DE32, the Tecsun R-2010D, the Kchibo KK9803 and the ShouYu SY-X5. With the exception of the ShouYu SY-X5, all of these manufacturers have in the past produced at least one portable with truly notable performance (the Degen DE1102, 1103, Kchibo D96L and an array of Tecsuns, including the PL 310, 380, 390, 600 and 660).

Moreover––so that you can hear the difference for yourself!––I’ve included linked audio clips for each model. They were all tuned to the same frequency, same broadcast and within seconds of one another.

But first, what is a DSP radio? And why do we need them?

The Silicon Labs DSP chip found in many of these radios.

The Silicon Labs DSP chip found in many of these radios.

Mechanically-tuned DSP

Radio is no longer just your granddad’s medium.  Several years ago, the digital signal processing chip manufacturer, Silicon Labs (SiLabs), altered the entire radio landscape with one little chip. Indeed, most new digital shortwave/AM/FM radios on the market use a SiLabs (or other manufacturer’s) DSP chip as the centerpiece of their receiver architecture.

Using a DSP chip in a fully digital radio makes sense: after all, you have a digital display, digital buttons, and digital encoder. But using a digital chip with a traditional analog display––a mechanically-tuned DSP radio––does that make sense?

SiLabs and a growing number of radio manufacturers and retailers believe the answer is a resounding “yes.” In truth, there are concrete benefits to making this addition; among them:

  • Decreasing production cost of radios by as much as 80%
  • Decreasing R&D costs of new radios dramatically
  • Digital signal processing with the simplicity of analog radio design
  • Reduced power consumption when compared with digital display radios
  • An avenue to make radios more affordable––especially to listeners living in poverty, such as those in developing world settings, who make up a large subgroup of listeners

When I first learned about the implementation of a DSP chip with a mechanically-tuned radio in 2010, I felt like it might be “the” way to make quality receiver performance available and accessible to many.  Now, four years later, several manufacturers have produced mechanically-tuned DSP shortwave radios.  All are available from sellers at a price of under $40 USD. Not bad…

Common review points for mechanically-tuned DSP radios

I’ve now reviewed enough mechanically-tuned DSP-based radios that I’m beginning to note performance commonalities that can only be attributed to the design of the DSP chipset itself, regardless of how these are implemented in each model. So, before the shooting starts, let’s take a quick look at some common review points of the contenders.

Tuning: not quite an analog radio…

I’ve got to begin with the most obvious common review point: namely, tuning.

For those of us accustomed to analog tuning, the DSP/analog combination is, well, completely different and a little quirky. Tuning a traditional analog radio is a fluid process which allows for a certain amount of play; you need not be precisely on a frequency to hear a station, and often you hear a station fade as another pops into the band pass. But when tuning analog DSP, you hear stations and static pass by in comparatively coarse 5 kHz chunks. Especially in radios with tiny analog frequency dials, it makes tuning feel somewhat “sticky” or finicky, and ironically, rather imprecise. You feel like you’re skipping over stations while band-scanning.  And for those accustomed to digital tuning, instead of using buttons to tune in these 5 kHz increments, you’re using a tuning wheel, with no customary “step” response.  Not what you would expect from either digital or analog radio.

But of course, you can locate your station with this method.  It takes a little practice––and a measure of patience––but you’ll adjust to this different method of tuning.  Note that much of this awkwardness may disappear if SiLabs produces a chip with more precise tuning increments, such as 1 kHz steps with decreased muting.

Automatic Gain Control

In all the models I’ve tested so far, the Auto Gain Control (AGC) is a little too overactive when listening to weak AM/SW stations. This results in a “pumping” sound and serious listening fatigue when set on weaker stations. However, on strong stations, all models perform quite well.

Conformity

Since all of these radios are based on the same chip family from SiLabs, you can expect eight shortwave bands: two FM bands, one AM (medium wave) band, and eight shortwave bands. The frequency ranges available to the manufacturer in all bands are identical.

FM

FM performance on each of these radios is above average, and the coverage quite wide––from 64 MHz to 108 MHZ in two FM bands. If you like listening to FM radio, you’ll be pleased with any of these inexpensive models.

And now for some action!

Now, we’ll pit these five radios against each other in an listener’s challenge that will leave the losers in the dust…and the winners clear.

Degen-DE321

The Degen DE321 – Current retail:  $21.00 USD

The DE321 was the first analog DSP shortwave radio on the market. The DE321 is small, slim, über-simple, and fits nicely in the hand. The analog tuning dial takes up more than half of the front face of the radio––a good thing, as the larger the dial, the easier the tuning. Performance-wise, the DE321 holds its own in this crowd; it’s quite reasonable in both sensitivity and selectivity. The DE321 is the most bare-bones radio among the five described here.

Degen-DE32

The Degen DE32 – Current retail: $27.00 USD

The DE32 is the smallest radio of the five. Unlike the DE321, the DE32 is not “just” a radio; it also sports a simple MP3 audio player and a small white LED flashlight. The DE32 has a small built-in speaker which delivers tinny and rather cheap audio, but is okay for a single listener, and fine for spoken-word broadcasts. Audio fidelity is greatly improved with headphones. Performance-wise, the DE321 is slightly better than the DE32 on shortwave.

Tecsun-R2010D

The Tecsun R-2010D – Current retail: $39.00 USD

When I first held the R-2010D, I initially assumed I had found the holy grail among analog/DSP radios:  while the R-2010D is the largest of the five radios, measuring nearly equivalent to my Sony ICF-SW7600GR (not a pocket-sized portable like the others) it nonetheless has a beautiful large analog display (a major plus!), an amply-sized speaker for great portable audio, and a fluid tuning mechanism. To top it off, the R-2010D has a small digital frequency display so that you can verify your frequency. The R-2010D’s AGC circuit handles strong stations well, but clips on weak stations. But the promising R-2010D has one major flaw: terrible selectivity. Indeed, the selectivity is so sloppy, that you will not be able to delineate two strong signals spaced 10 kHz apart from each other.

ShouYu SY-X5

The ShouYu SY-X5 – Current retail:  $27.00 USD

The SY-X5 surprised me: what makes this model stand out is the fact that it can be powered by either a rechargeable slim battery pack (found in the DE32) or three standard AA batteries.  It also has a built-in MP3 player that, like the Degen DE32, uses a standard microSD card for media storage. Unlike the DE32, the SY-X5 has a bright red LED display that helps in navigating MP3 files. The SY-X5 also has surprisingly good audio from its built-in speaker, rivaling the much larger Tecsun R-2010D. The negative here? Though the SY-X5 has a fluid tuning mechanism, it is prone to drifting when trying to adjust the analog tuning needle to frequency.

IMG_0823The Kchibo KK9803 – Current retail:  $16.00 USD

When I first wrote this review, I didn’t even include the KK9803. Why? Because, frankly, it’s one of the worst performing radios I’ve ever owned, and I would strongly discourage you from even considering it. My primary criticism of this radio is that the tuning is barely functional:  the shortwave band segments are far too close to one another on the dial, hence the digital tuning steps are too narrowly-spaced to offer any sort of tuning accuracy whatsoever. Barely moving the tuning wheel, one may pass over even a strong station…undetectably. The only hint of the station’s existence may be an occasional quick blip or audio buzz. I must confess that the experience of band-scanning (tuning) this radio offers is the worst I’ve ever known in any radio. Don’t buy it. In our shootout, it’s bitten the dust before it even aims, because let’s face it:  this radio just can’t.

Audio comparisons

Click on each radio model to hear a short comparison audio clips. Note that I added an audio sample of the Tecsun PL-660 to the weak signal DX examples as a benchmark.

The Tecsun R-2010D (left) has the best audio from its large internal speaker, the Degen DE32, on the other hand, produces "tinny" audio via its speaker.

The Tecsun R-2010D (left) produces excellent audio from its large internal speaker. The Degen DE32 (right) produces “tinny” audio via its tiny built in speaker.

Local AM Comparison (1350 AM)
Degen DE321
Degen DE32
ShouYu SY-X5
Tecsun R-2010D

Weak Signal Shortwave Comparison (KBS 9,805 kHz)
Degen DE321
Degen DE32
ShouYu SY-X5
Tecsun R-2010D

Tecsun PL-660 (AM and Sync)

Strong Signal Shortwave Comparison (WINB 9,265 kHz)

Degen DE321
Degen DE32
ShouYu SY-X5
Tecsun R-2010D

The Winners

All of these radios share similar qualities.  After all, they’re brothers of a sort, built around the same family of DSP chips. If you’ve read the summaries above, then you won’t be disappointed by any of these that follow–especially at this modest price point. Still, I reach for different radios based on their strengths, and to help you choose, here’s a “best of” list:

Most versatile: ShouYu SY-X5

Best Audio: Tecsun R-2010D and ShouYu SY-X5

Best sensitivity: Tecsun R-2010D

Best value: Degen DE321

Best overall?

The ShouYu SY-X5

The ShouYu SY-X5

If I had to choose just one of these radios, it might just be the ShouYu SY-X5. It offers the most value and versatility for the performance. I think its audio is brilliant for a pocket radio, and I love the fact it has an LED display to help me navigate through the MP3 files loaded on my microSD card. However, as with any of these low-cost contenders, don’t expect to try any weak-signal DXing with the SY-X5.

By the way, if the Tecsun R-2010D simply had better selectivity and weak signal gain control, it would win this contest, hands down. In fact, I actually sent feedback to Tecsun engineering regarding the R-2010D selectivity shortcoming in the hope that they’ll fix this problem in future production runs.  You might do the same.

In conclusion, mechanically-tuned DSP portables may not pack DXer-grade performance, but they are priced so that everyone can afford to experiment. And for your buck, that’s pretty good radio bang!


This article was previously published in The Spectrum Monitor.


Resources

Click on the radio model to read full reviews of each radio on the SWLing Post–I’ve also provided links to eBay:

Review of the Elecraft KX3: world-class transceiver, superb shortwave receiver

I originally wrote this review for Monitoring Times Magazine, May 2013 issue (pages 56-57). The review that follows has been expanded and includes updates.

The Elecraft KX3 Transceiver (Click to enlarge)

The Elecraft KX3 Transceiver (Click to enlarge)

You may have noticed that in the past few years, while more and more software defined radios (SDRs) are appearing on the market, fewer and fewer traditional tabletop shortwave receivers are being introduced. Most of the receivers in production, meanwhile, are quite mature, having been in production for years. For those of us who still have an appreciation for the traditional front panel, tuning knob, and portability of an all-in-one tabletop receiver, perhaps we should look to the active ham radio transceiver market.

Introducing the Elecraft KX3

Besides being an avid SWLer (ShortWave Listener, for the newbies out there), I’m also a ham radio operator (callsign: K4SWL). But if you’re not a ham, you may not be familiar with the innovative, US-based radio designer and manufacturer, Elecraft. First of all, note that “US-based” adjective: this is an increasingly rare phenomenon in the world of radio production, and it deserves a word of praise up front. Elecraft started life as a kit manufacturer, focusing on QRP ham-band-only radio transceivers that were effective, affordable, and maintained a very high level of performance. Their K1, KX1 and K2 transceivers are legendary, and I’ve had the good fortune to own them all at some point along the way. Their K3, introduced in 2008, became a benchmark transceiver and still tops the charts in performance; it’s truly a choice DXpeditioner’s radio.

In 2011, Elecraft introduced the KX3–a portable SDR transceiver with a full-featured knob-and-button user interface that doesn’t require connection to a computer to operate. At the Dayton Hamvention, the KX3 instantly drew crowds, as it was unlike any other transceiver on the market. I was there, and like others in the crowds around the Elecraft booth, I was eager to try out this full-featured transceiver, especially upon learning that even the basic, no-options model has a general coverage receiver. A ham transceiver with “general coverage,” incidentally, means that its receiver is not limited to the ham bands only; these receivers typically receive between 100 kHz and 30 MHz (i.e., the full shortwave radio spectrum). That morning at the Hamvention, I quickly made my way to one of Elecraft’s owners, Wayne Burdick, to ask him,“Would the KX3 make for a good shortwave radio receiver?” Wayne’s prompt response: “Yes.”

That was enough for me: more than ever, I simply couldn’t wait to get within reach of a KX3. Why? I love to travel and take radio along, but I’ve always had to haul separate transceivers and receivers for my separate-but-related hobbies: 1) ham radio and 2) SWLing. Perhaps the KX3 would suit both purposes? I was hopeful. If this was true, with a KX3, I could have a full-featured QRP transceiver and a shortwave receiver in one…and a portable one at that. Ideal!

I just had to get my hands on one to find out.

(Click to enlarge)

(Click to enlarge)

A closer look

Though the KX3 was introduced in the summer of 2011, it didn’t start shipping until a few months later, and there was a backlog of orders for it. Fortunately, my good buddy, Dave Anderson (K4SV), was among the first purchasers of the KX3, and he was generous enough (and trusted me enough!) to let me borrow it.

At first glance, the KX3 resembles just the faceplate of a tabletop radio: it has a large tuning knob, wide, clear amber backlit display, and a traditional set of function buttons and multi-function knobs…but not much else. Or so it appears, as there’s no bulky chassis. Connections for microphones, DC power, headphones, IQ out, key and PC interface are located on the left side panel of the radio, while the RF connection (a female BNC) is on the right side panel. The KX3 has built-in folding feet, quite sturdy, that allow the radio to be tilted at a comfortable angle for tabletop operation.

To best evaluate the KX3, I’ll first discuss some of the features that would interest a ham radio operator, then focus on those best suited to the SWLer.

There is a hidden keypad for direct frequency entry (notice the numbers printed next to the multi-function knobs and buttons?)

There is a hidden keypad for direct frequency entry (notice the numbers printed next to the multi-function knobs and buttons?)

Everything for the Ham

If you’re a ham, you’ll love the feature set on the KX3. It must be one of the most comprehensive set on any radio I’ve ever used. At a bare-bones level, meaning without adding any options, the basic KX3 is truly an all-in-one QRP transceiver.

Of course, it will function on any mode: USB, LSB, CW, data, AM and FM. The output power is adjustable from 0 to 10 Watts. You can easily adjust the DSP filters, AF, RF, passband, and notch all from dedicated buttons and knobs. It even has a memory keyers for both CW and voice.

You say you prefer digital modes? Not only will the KX3 natively decode RTTY and PSK31 and display the scrolling text on the display, but you can also send RTTY and PSK31 without a PC. How? Simply set the appropriate data mode and use your key to tap out your message in CW. Though you will hear the CW side tone, the KX3 will transform your code into RTTY or PSK-31, and send. Hypothetically, armed with only a KX3, you could run a RTTY contest from the field with no computer. Remarkable.

The variable DSP filtering is most impressive and the KX3’s ability to block adjacent signals is benchmarked. Indeed, if you look at Sherwood Engineering’s receiver test data rankings (http://www.sherweng.com/table.html), which are sorted by third-order dynamic range (narrow spacing), the KX3 is second only to the Hilberling PT-8000A, an $18,000 transceiver.

With the installation of the $170 optional internal automatic antenna tuner (the KXAT3), you will be able to tune most any wire antenna on the go, with no need to carry an external ATU.

In short, for the ham, the KX3 offers a cornucopia of features, too numerous to list here; but I can at least tell you that I discover something new on this radio almost every day and continue to be amazed by the features on this transceiver, especially considering that it costs only $1000 ($900 in no-solder modular kit form).

The Elecraft KX3 is built for travel and portability--here we compare its size with the Grundig G3

The Elecraft KX3 is built for travel and portability–here we compare its size with the Grundig G3

For the SWLer

We’ve talked about the KX3 as a ham radio transceiver, but how does it stack up if your primary interest is to just sit back and listen to broadcasts? Short answer: Very, very well.

The KX3 is loaded with features that would please even the most discriminating DXer.

First, on the faceplate, the KX3 has a multi-function knob that controls both the AF and RF gains. It’s very simple to use, even though I’m not a fan of switching between the AF/RF gain controls on the same knob. AF gain is what most of us refer to as a volume control and many dedicated shortwave receivers lack an RF gain control even though it’s a vital tool for broadcast listening in noisy conditions. By default, the KX3 RF gain is set to zero; turning the RF pot counter-clockwise will decrease RF gain.

Grundig G3 (left), Elecraft KX3 (right)

Grundig G3 (left), Elecraft KX3 (right)

The KX3 also has three different preamp settings, which are useful for amplifying weak stations, as well as an attenuator for local or strong broadcasters. The KX3 has passband and notch filtering, and an auto-notch function that effectively deals with heterodynes from nearby carriers. The KX3 also has DSP noise-reduction (NR) for noisy band conditions (or to help a signal “pop” out from the noise) and noise blanking (NB) for local RFI.

Many automatic gain control (AGC) parameters are adjustable, too, so they can be tweaked for AM fading and weak-signal DXing. The fact is, the KX3 has more built-in receiver controls than the dedicated tabletop shortwave receivers I’ve owned.

Audio

Left side panel of the Elecraft KX3 (click to enlarge)

Left side panel of the Elecraft KX3 (click to enlarge)

To be clear, however, there is one negative in the architecture of the KX3 when viewed through the eyes of an SWLer. The KX3 is designed around the amateur radio operator and AM bandwidth is narrower than you will find on most dedicated tabletop shortwave receivers–indeed, a commonality on any general coverage ham transceiver. The KX3’s AM bandwidth can only be widened to 4.2 kHz–a figure that almost made me dismiss this radio’s SWLing abilities out of hand. I’m glad I didn’t let that spec stop me, though: I had read many a favorable comment from KX3 owners who used the radio to listen to the broadcast bands. Their comments on the audio were very positive, and for good reason.

What the KX3 lacks in wide bandwidth is made up for by the 32-bit floating point DSP architecture. I’m not sure how, but the KX3’s audio fidelity “sounds” much wider than 4.2 kHz. Indeed, I still have a difficult time believing that the filter is not closer to 7-8 kHz in width. When using headphones or amplified speakers, the bass response rivals some of my tube receivers. There are even adjustable 8-band equalizer settings for audio to improve this even further.

In addition, Elecraft has unique audio effects available in the audio effects menu. One I’ve found very valuable in broadcast listening is called “delay,” a stereo simulation effect that broadens the mono sound in such a way that the audio sounds even richer.

Memories, scanning and tuning

The KX3 has 100 general-purpose VFO A/B memories with optional alpha numeric labels. It also supports channel-hopping or scanning within any number of labeled memory groups. Auto scan is simple and works in both muted and (my favorite) non-muted, or continuous, modes.

The KX3 can also use the “K3 Memory” application from Elecraft’s K3 transceiver, which allows for longer labels and the instant selection of desired memories from a PC. The “K3 memory” application is a free software download on Elecraft’s website.

The tuning knob on the KX3 is substantial and of good quality. It’s only slightly smaller than the tuning knob on my Alinco DX-R8T, so it’s a substantial knob, which is helpful to big (or buttery) fingers. The drag can be easily adjusted with a supplied hex wrench. The tuning rate can be adjusted to .5 kHz increments, allowing you to quickly tune through the band. The small multi-function knob next to the main tuning knob can also be set for a 1 kHz rate.

At first glance, you might not realize that the KX3 has a direct frequency-entry keypad. Check out the photo, however [MAKE REFERENCE TO POSITION ON PAGE]. The buttons and multi-function knobs in the lower left quadrant of the KX3 double as number pad, decimal point, and an “enter” button for a keypad. I thought this a bit odd at first, but now find I use this all the time.

Installing the optional ATU is very simple and requires no special tools or soldering

Installing the optional ATU is very simple and requires no special tools or soldering

Optional ATU: Worth the Cost

As I mentioned earlier, the optional automatic antenna tuner, the KXAT3, makes a lot of sense for the ham who operates portable. If you are a licensed amateur radio operator, the ATU can be a powerful tool for matching random length, or multi-band antennas to your desired broadcast band by tuning to a nearby ham band frequency. The L and C parameters of the tuner can be manually adjusted to optimize without transmitting. The user can select one of 8 L’s or one of 8 C’s parameters in the ATU MD menu entry. When an L is selected, C is set to 0, and vice-versa. However, it is not presently possible to select combinations of L and C to achieve a closer resonance. Still, selecting an L or C value in this way will provide a useful increase in gain.

In addition, if you like medium wave (MW) DXing, the ATU comes with MW (AM broadcast band) filtering that tracks the VFO, somewhat improving image rejection between 300-1,000 kHz. I have tested the KX3 on medium wave both with and without the ATU installed and find that it certainly improves rejection.

To be clear though, sensitivity decreases as you tune below 1,500 kHz. Elecraft informed me that it was necessary because the KX3 uses PIN diodes in its T/R switch, and the signal must be high-pass filtered to avoid IP2 problems with the diodes. When you tune through the 300-1200 kHz range (or so) you will certainly notice the loss of sensitivity. Elecraft also noted that selectivity in the AM broadcast band was not a major design criteria, so in this band the 160 meter low pass filter is used. This is not ideal from a harmonic rejection standpoint, and there will be some 3rd and 5th-harmonic images from strong stations. Adding the ATU helps with this. However, adding the ATU doesn’t generally improve sensitivity in this range.

The ATU is very easy to install–almost “plug and play” (see photo).

Oh, yes–and it’s an SDR, too!

As if the KX3 didn’t do just about everything, it also has a quadrature down-sampling mixer compatible with PC-based SDR (software-defined radio) applications. This means, via a shielded stereo audio patch cable and a supplied USB control cable, you can connect the KX3 to your PC and use a freeware SDR application like HDSDR to turn your KX3 into a proper software-defined receiver.

SDR functionality is limited to receiver functionality, and depending on the bandwidth and sampling rate, will be dependent on the quality of your sound card. The true benefit is the ability to see a wide–48 kHz or more–chunk of spectrum.

Summary

Every radio has its pros and cons. When I begin a review of a radio, I take notes from the very beginning so that I don’t forget some of my initial impressions. Here is the list I formed over the time I’ve spent evaluating the KX3. Note that I created this list with the shortwave listener in mind, not necessarily the ham radio operator.

I even had some success SWLing using an inexpensive whip antenna (attached via BNC).

I even had some success SWLing using an inexpensive whip antenna (attached via BNC).

Pros:

  • World class, benchmarked receiver performance powered by high-performance 32-bit floating-point DSP
  • Rich, full audio fidelity on AM despite limited bandwidth (see con)
  • AF and effective RF gain controls
  • Adjustable filters (no optional roofing filters needed for SWLing)
  • Superb sensitivity and selectivity; outperforming even my WinRadio Excalibur with weak signal DXing
  • Very low noise floor
  • Auto-notch, which helps eliminate annoying heterodynes, even in AM
  • Internal ATU option brings improved MW image rejection (see MW con) and hams have the ability to tune a random length antenna
  • Natively decode (170 Hz) 60-WPM RTTY and display it right on the KX3’s VFO B display, which is alphanumeric
  • Battery operation via 8 AA batteries
  • Lightweight
  • Dedicated headphone jack
  • For non-ham radio operators, the transceiver can be disabled and re-activated once you have a license with a simple hardware adjustment. No need to fear accidental transmission
  • For hams, or those who plan to become one, the KX3 is a QRP transceiver in the top of its class

Cons:

  • AM bandwidth limited to 4.2 kHz (see pro)
  • Hand mic connector is the less standard 3.5 mm audio plug
  • Built-in speaker is small with limited volume and fidelity–only intended as a back-up when headphones or external powered speakers are unavailable
  • AA batteries fit a bit tightly in internal holder and can present a challenge to remove
  • Medium wave reception is mediocre at best, but with the optional ATU, is improved though slightly better image rejection (see ATU pro)
  • Very slight audio whine (similar to a faint heterodyne sound) heard in some zero beat AM stations; may be fixed in future firmware update
  • No AM sync detector (AMS)

Did I buy one? Confession time

I must admit, I was appreciating my buddy Dave’s KX3 very much. Maybe too much…

I have three hobbies: shortwave radio listening, ham radio, and traveling. After using the KX3 for a few hours, I knew it would be my perfect companion. Not only is it a top-notch amateur radio transceiver, its also an excellent shortwave radio receiver. It’s portable, but also makes an excellent tabletop radio. It’s an all-in-one radio, but can also double as an SDR when connected to a PC.

So, is the KX3’s broadcast audio fidelity as good as a purpose-built broadcast receiver like the legendary Drake R8B? Not quite. But I would argue that its ability to receive weak signals would give even a Drake a run for its money. I have to admit, the KX3 receiver outperforms my Alinco DX-R8T in every respect. Even though the AM bandwidth is limited to 4.2 kHz, I think the audio also sounds better than my Alinco and any of my portable radios with wider bandwidth.

The Elecraft KX3 Transceiver (Click to enlarge)

My Elecraft KX3 Transceiver (Click to enlarge)

Needless to say, I bought one. It was only fair to Dave, who needed to discover for himself what his loaned-out rig could do.

The KX3 is a game changer for me. Though I’ve always carried portable transceivers in my travels, I’ve also had to carry a separate tabletop receiver and an SDR or portable radio for my SWLing. No more. Moreover, I like the broadcast audio on the KX3 well enough to record and archive shortwave broadcasts, which I frequently do for my blog, The SWLing Post and The Shortwave Radio Audio Archive. In my shack, I’m even considering purchasing Elecraft’s 100 watt amplifier and doing away with my 100 watt tabletop transceiver.

As for support? No worries there. I’ve been an Elecraft customer for years and I can tell you that they believe in and stand behind their products. I purchased with confidence.

I encourage you to try on the KX3 as well. It may very well be all the radio you’ll ever need.