Category Archives: Reviews

Using and setting up the Alinco DX-R8T/E receiver as an SDR (software defined radio)

The Alinco DX-R8T (DX-R8E in Europe) can be used as a traditional tabletop or as a software defined receiver

Some time ago, I posted a review of the Alinco DX-R8T–a surprisingly capable, flexible and affordable dedicated tabletop receiver. In that review, I explored its capabilities as a tabletop unit, and was favorably impressed.

But I knew then that one of the virtues of the DX-R8T is that it’s more than a typical tabletop: the control head (or, front panel) can literally be detached, and with an extension cable, can be moved as far away as 16 feet from the rest of the receiver. Also, with the optional ERW-7 cable and a shielded audio patch cord, you can connect the Alinco to your PC, converting it to a software-defined radio (SDR). Just to be fair, I wanted to further check out this alternative operation mode, and review it independently.

I’ve recently had an opportunity to explore the Alinco DX-R8T/E as an SDR, and here’s what I’ve discovered.

As it took some time to figure out how to get KGSDR, the Alinco control software, communicating with my DX-R8T, it’s fair to state that the Alinco’s SDR functionality is not exactly “plug-and-play.” Nor does Windows seem to find the USB driver automatically. You must download a USB driver for your computer, as well as download KGSDR from external sites. It’s also important to note that the Alinco website is not easy to navigate–at least, the relevant links are somewhat buried in large portions of site content.

When I first attempted to set up my receiver as an SDR, I had to use a combination of the printed owner’s manual, the Alinco website, external sites, and simple determination.

Before reviewing the actual performance of the Alinco DX-R8T/E as an SDR, I’ll simplify setting it up as an SDR with a step-by-step process, below. (I wish this was clearly outlined in the owner’s manual, however.)

How to convert your Alinco DX-R8T/E into a Software Defined Receiver

The ERW-7 is the cable that connects your Alinco DX-R8(T) to your computer.

1.) Connect the ERW-7 cable and download the driver

The ERW-7 is the USB cable that connects your Alinco DX-R8T with your computer. Specifically, it allows your computer to tune and control the DX-R8T; it does not carry audio. If you wish to have full control of your receiver via your PC, you will need to purchase the ERW-7.

You simply plug one end of the cable (the one that looks like an 1/8″ audio connector) in the “clone” port on the back of your Alinco, the other end into an available USB port on your computer.

The download page–at FTDI Chip, the manufacturer of the Alinco cable–has versions of the USB driver for most OS platforms. If you have Windows, you can save a little time by downloading the USB setup tool that will attempt to automatically load the USB driver. Otherwise, you can download and manually install the drivers for the Windows 32 bit version or Windows 64 bit version.

You will need a shielded audio patch cord with 1/8″ stereo plugs on both ends

2.) Connect an audio patch cord

The Alinco DX-R8T/E sends the received IQ signal to your PC via a shielded audio patch cord. This is a standard audio cable that you can purchase at most electronics retailers. It needs to have 1/8″ stereo connectors on both ends, and it must be shielded.

One end of the patch cord is plugged into the IQ port on the back of the receiver, the other is plugged into the microphone input on your computer.

3.) Tell your DX-R8T/E to send the IQ audio to your computer

Your computer will need to “hear” the IQ (spectrum) audio produced by the Alinco DX-R8T/E. The receiver will only send the IQ audio to your computer if you tell it to do so. Fortunately, this is easily done: simply press the MODE button on the front panel of your receiver until FM appears. Then, simply press the FUNCTION button, then the MODE button. Your Alinco should now display “IQ” on the main display. You can feel confident the audio is now being sent to your PC.

4.) Install KGSDR

The KGSDR controls are very similar to those of the Ten-Tec RX-320D

KGSDR is a software-defined radio application built specifically for the Alinco DX-R8T/E receivers. A third-party software developer maintains the download page for the KGSDR. Click here to download the setup software for Windows. (If this link doesn’t work, you can also download a zipped copy by clicking here.) To my knowledge, there are no updates to the software–as of time of this post, the current version is 1.0.0.

Installation is simple and only requires that you extract the contents of the zipped folder, then run the KGSDR executable file.

If all has been installed correctly, and the IQ signal is being sent to KGSDR, then you should be able to hear the received audio via your computer.

I have actually installed KGSDR on three different computers. On my laptop, I had to troubleshoot and tweak the settings to get KGSDR to work. On the other two computers, it worked the first time. All of them were running a 64 bit version of Windows 7.

Troubleshooting tips

If you change the tuned frequency on KGSDR from, say 5,000 kHz to 10,000 kHz, but your Alinco receiver does not change frequencies (it still displays the centered frequency on the front panel), then the USB driver has not been installed or configured properly.

If the receiver tunes, but the audio is garbled or non-existent, you will need to check the audio cord connections. First of all, make sure it’s plugged into the microphone input on your computer (not the speaker/headphone port!) and the IQ port on the back of the Alinco. You cannot plug the patch cord into any other port port on the DX-R8T/E. The plug will fit in the headphone jack, for example, but the IQ port is the only one that sends interpretable analog information to your PC.

Review: the Alinco DX-R8T/E as an SDR

KGSDR comes with a spectrum and waterfall display (Click to enlarge)

I have read reports of people achieving remarkable results with their Alinco functioning as an SDR…I wish I could report the same.

While the Alinco DX-R8T/E is a very capable tabletop receiver, I find that the SDR functionality adds very little, performance-wise. In fact, in many respects this function seems to compromise the performance of the DX-R8T/E. Still, there are some positives:

Pros

Affordable – the EWR-7 USB cable is about $45 US, and you can easily buy a shielded audio patch cable for under $10. For about $55 US, you can unlock the SDR functionality of your receiver.
With KGSDR, you can see a bit of the surrounding spectrum on a waterfall display
KGSDR is a very lightweight program, not likely to tax even older PCs.
KGSDR allows for variable filter control–a true compensating factor since the DX-R8T/E only has a wide/narrow filter on AM (see review)
You get the basic benefits of typical SDR receivers:
- Spectrum/Waterfall display
- Recording at the push of a button (.wav only)
- Practically unlimited memory slots
- With practice, you can import frequency databases
- A basic DSP filter
Simple “lightweight” application that should work on any Windows-based PC (see con)
With a DRM decoder, you will be able to receive and decode DRM transmissions (see con)

Cons

Performance is underwhelming–not as good as the DX-R8T as a stand-alone tabletop receiver
- Images of strong stations several kilohertz above the source
- DX-R8T/E sensitivity is somewhat compromised in SDR mode
- Selectivity is mediocre
Audio patch cord transfers computer/shack RF noise more easily than SDRs which use a digital IQ output via USB
Audio fidelity, in general, is not as good as the stand-alone receiver will provide
KGSDR has only the most basic of SDR features
KGSDR does not allow the spectrum display to be expanded vertically
Requires tweaking and repeated efforts in order to function properly
Owner’s manual and website are confusing and lack vital information about the installation and trouble-shooting process (hopefully our guide above can help the average user)
DRM mode is not native; you will have to use a program like DREAM (see pro)

Summary

So, is it worth it? Well, yes––and no.

Yes

If you have $55-60 US dollars to spare, it’s a real bargain. I believe the extra SDR features and functionality are worth the price. I have not yet tested this in a DXpedition setting, where there are a limited number of RF noise-producing devices around. If you have an RF-“quiet” location in which to use the Alinco as an SDR, you may find you have better results than I describe above. I imagine you will still suffer from some imaging of stronger signals, however.

Plus, KGSDR is so lightweight, I believe you could use it on a netbook. Moreover, I have heard of owners who’ve actually used other open source SDR applications to drive the Alinco DX-R8T/E. Additionally, though I have not yet tested it, N4PY makes a software controller that would be far superior to the KGSDR–I base this on the fact that N4PY’s RX-320D software was such an improvement over the standard OEM package.

If you wish to enhance the performance (not features) of your Alinco DX-R8T/E, I do not think it’s worth it to put your Alinco into service as an SDR. Again, I find that it somewhat compromises the performance of what is otherwise an excellent tabletop radio.

If, like me, you have other SDRs in the shack, you’ll find that you’ll seldom use the Alinco as an SDR. Your other digital IQ-based receivers or IF receivers will most likely run circles around it.

Thanks, Alinco

I think it’s pretty cool that for under $500, you can purchase an excellent tabletop receiver like the Alinco DX-R8T/E. Its price tag is significantly lower than its top two competitors (the Icom R75 and Palstar R30A). Still, even with this price edge, Alinco added bonuses like a detachable face plate and SDR functionality, making this a “Swiss Army Knife” of a receiver. So, again,I’ll say…thanks, Alinco!

What do you think?

If you are using the Alinco DX-R8T or E as an SDR and feel you are achieving better performance than I’ve described, or would like to share any other thoughts/suggestions, please comment below. Note that my Alinco is a very early-release–perhaps from the first production run. It is possible that some of the issues I mention above have been resolved in later production, or that I simply have not finished properly tweaking settings. I await your responses!

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Review of the 2012 Pirate Radio Annual

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Pirate radio is perhaps one of the most dynamic aspects of the diverse landscape of SWLing. In direct contrast with major broadcasters, many of whom are now thinning out their offerings, pirate radio just seems to adapt and grow.

I started listening to shortwave pirates in earnest only a few years ago. I had listened to pirates in the past, but had never followed the pirate scene, nor understood how to reliably find pirates on the shortwave radio dial. I now know, by the number of emails I receive from SWLing Post readers, that there are many others who feel as I did then.

Pirate radio broadcasters do not follow a regular broadcasting schedule, often operate at very low power, and are not necessarily always on the same frequency or even mode. It’s no wonder they’re hard to find.

I wish, in those early days of exploring the pirate bands, I had known about the Pirate Radio Annual, produced by pirate radio guru Andrew Yoder.

Not only is this book, which explores the pirate radio scene in North America, well written and insightful, it is chock-full of information. It’s a bit like the programming section of the former Passport to Worldband Radio, only focused on pirates. The book also comes with an accompanying audio CD. Yoder, by the way, has been covering the pirate scene for decades; he’s also the former publisher of hobbyist magazine Hobby Broadcasting.

The 2012 Pirate Radio Annual is divided into several sections:

An intro to the guide which–among many other things–explains important terminology, such as the difference between a pirate and a jammer
How to QSL pirates
Pirate station classification
A feature article comparing three different AM shortwave pirate transmitters
Other articles with interviews and events/media that have had an impact on the pirate scene (including the controversial “Pirate War” of 2012)
Profiles of pirate radio stations heard in 2011, with an additional section on international pirates heard in North America
An index for the included audio CD

I especially like the extensive station profiles of pirates who were active in 2011. Not only can I get more info about the more elusive stations that don’t offer many clues to their raison d’etre–such as Radio Strange Outpost–but it also makes for a handy resource to glean QSL contact info. In fact, I learned a lot about the personalities, broadcast histories and habits of many pirates we’ve featured here (like Undercover Radio, Captain Morgan Shortwave, Wolverine Radio, and North Woods Radio, to name a few). Yoder is able to provide details about these station that your average listener just wouldn’t know, including the types of transmitters used, output power, and historical perspectives.

The accompanying audio CD features clips from 78 stations, and includes audio from the transmitter comparison in the book.

For about $20.00 US (with shipping), the 2012 Pirate Radio Annual is unquestionably a great buy for those interested in pirate radio.

You can purchase the 2012 Pirate Radio Annual from:

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Frank’s assessment of the Elad FDM-S1

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The ELAD FDM-S1 Software Defined Receiver

SWLing reader Frank Holden (VK3JFH/VP8DNM) contacted me by email to share his experience with the ELAD FDM-S1–of particular interest because we have yet to see many reviews of this particular software defined receiver. Although the FDM-S1 was announced with some modest fanfare, its actual release and availability skipped over many of us. Not over Frank, however: he purchased an FDM-S1 and had it shipped to his home in Australia, where he apparently put it through its paces.

Frank’s overview of the ELAD FDM-S1 is quite good, and he has kindly given us permission to post his observations here:

I have had an ELAD FDM-S1 now for over a month, having purchased it directly from the manufacturers, and while I don’t feel qualified to write a review you may be interested in my opinion of it.

In my shack at present I have an Icom R-1500, Icom 718, Tecsun 390, Tecsun 660, Grundig G6, Sangean ATS 909, Drake SW 8, Kenwood R5000, a Funcube Dongle and an Alinco DJ-X11. In the way of antennas I have a couple of dipoles, a G5RV , and a 10 metre vertical for TX together with an AOR DC to Daylight, a Diamond discone , a GWhip longwire and a simple 7 metre long untuned vertical on a squid pole for RX.

I was going to buy my ELAD pre-release from WoodBoxRadio but language difficulties and confusion over getting it VAT-free put paid to that. I take full responsibility for the confusion……

In the end I bought one direct from ELAD sdr for 362.81 Euros VAT-free, which price included 10 Euros postage to Australia. It arrived within a week… would that everything that I bought from overseas was as cost effective and fast.

Out of the box it was simple enough to set up with just a USB connection to the computer. I have it connected to a Dell Netbook and this had to be upgraded to XP Service Pack 3 together with some .Net software, the purpose of which remains something of a mystery. I imagine with a newer computer it would operate straight out of the box. It came with a DVD which had both the .net software on it plus an early version of the operating software. I immediately upgraded this software to v3.07 which is what I am currently using.

I believe that originally the frequency range stopped at 30 MHz… however, it can now receive up to 452 MHz if this is selected in the advanced menu. As I write this I am monitoring aviation traffic on 132.200. Likewise the original viewable spectrum was quite restricted, but in the latest version 1.2 MHz can be viewed in the waterfall.

Tuning is straightforward… either by direct keyboard entry or by clicking on the waterfall…. there are also three ‘sliders’ at the bottom of the screen which permit ‘mouse tuning’ by either metre band, MHz, or kHz. Mode selection and quite a bit of other stuff (did I mention that this is not a technical review?) are on a drop down menu at the right hand side of the screen. DRM is included amongst the modes and I listen to RNZI DRM most evenings.

I haven’t used any of the recording options on this radio yet. What I have been doing is either simple SWLing where the ability to monitor an entire Metre band is excellent, especially when combined with the info on the WRTV frequency guide DVD. I also use it at other times of the day in what I suppose you could call ‘Ham’ mode where it can be left watching the 20 metre, 40 metre or other ham band and I can see when a band has opened… far simpler than scanning around…

So all in all, I am very satisfied and would recommend this SDR to anyone.

My #2 radio these days is my Tecsun 390 with its ETM… another bit of brilliant kit.

Frank also sent some helpful photos of his screen, and added:

I am currently running v.3.07 beta… the last shot is the latest ‘polished’ version 3.01.

As you can see in that shot, you can now get three screens, including an AF and an IF screen. That version also comes with a separate program that lets you work with recorded files more easily.

He even included some photos of recording:

Thanks for your most interesting observations, Frank. If there are any others out there who have experience with the Elad FDM-S1, feel free to comment below or simply contact me.

For those of us here in the US, to my knowledge there still is no FCC approval of this device. I have contacted Elad with this question; they’re on annual holiday leave just now.

Follow our other Elad FDM-S1 posts with the tag: Elad FDM-S1

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Recording Radio Kuwait with the RadioJet’s IF recorder

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While playing with the Bonito 1102S RadioJet the other day, I received a strong signal from Radio Kuwait. I thought I’d record the music they were playing, as the fidely was impressive for a signal traveling nearly 7000 miles.

Instead of recording the actual audio of the broadcast with the RadioJet’s AF recorder, I decided to use the IF recorder, which saves and records 24 kHz of actual spectrum. This is an excellent way to record while leaving it unattended. Later, when you review the material, you can refine and shape your recording of an individual broadcast. Then, if an adjacent signal or some other condition requires you to adjust filters, you can do so just as you would when recording a live broadcast.

Though the file sizes are marginally larger than those the AF recorder produces, it’s not a hard drive-eater like broad spectrum recordings on an SDR.

One more (very cool) RadioJet feature: while making an IF recording, the RadioJet embeds UTC time code in the recording. This way, should you make a recording and forget to note the time you begin it, the time code shows up in the display. The Perseus also does this, and I think it’s a brilliant addition.

If you want to hear the 30+ minute recording I made of Radio Kuwait, simply listen to the file embedded below, or click here to download the mp3:

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Review: The Worldwide Listening Guide

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The Worldwide Listening Guide by John Figliozzi

On the SWLing Post, I write an annual review of the World Radio TV Handbook–a fantastic and comprehensive frequency guide, with a focus on broadcasters and frequencies, though it certainly lacks the programming detail–i.e. content–I so enjoyed in the late Passport To World Band Radio.

That’s where John Figliozzi’s The Worldwide Listening Guide (WWLG) comes in–in short, I think you need a copy in your shack, not to mention, next to your computer.

The Worldwide Listening Guide is like no other frequency/schedule guide you’ll find on the market. First of all, it’s instantly apparent that the author, John Figliozzi, is a DXer, since the book has a spiral bind–which permits it to lie flat when open, and allows the pages to be folded back to take up less table space. A small detail, but important for those of us who want an easily accessible reference in the shack. Figliozzi, moreover, is a noted SWLer, a long-time active member of the North American Shortwave Association, co-host of the annual NASWA Winter SWL Fest in Plymouth Meeting, PA–and did I say, a great guy?

But back to the book: perhaps what makes the WWLG so unique is its comprehensive look at “radio” listening in general, guiding the reader through the many forms radio content now takes: live, on-demand, WiFi radio, podcasts, satellite, internet, AM/FM and, of course, shortwave radio. He explains the pros and cons of each delivery method and a little about its utility. I thought that I wouldn’t gain a lot from these beginning sections as I’m quite familiar with all of them, but was pleasantly surprised to find all sorts of interesting facts hidden within; no doubt you will, too. Figliozzi also spends a good deal of time time covering the various devices–such as WiFi radios, satellite radios, apps, shortwave radios, portables–that have become indispensable tools of the trade.

Program details like no other

My favorite part of WWLG, and the sections I turn to the most, are those covering programming and content. Figliozzi exhaustively curates more than 4,000 programs sorted by time of day, station, days of broadcast, program types, their frequencies and web addresses. He also sorts the listings by genre: from the arts, culture and history, to music, sports and more. In fact, he has a well-thought-out list of 34 genres that have helped me locate programming I would have otherwise have never known about. For example, SWLs will find his “Media and Communications” genre listing programming from Allan Weiner Worldwide, Glenn Hauser’s World of Radio and DXers Unlimited to Click and Tech Nation. Each listing tells you exactly when you can catch the program, and where.

What’s also great is the fact that if I find a program I like, I can cross-reference its offering on shortwave–and, if I miss that, I can look up where to find it on demand, on the internet.

A program guide with longevity

I have the 5th edition of The Worldwide Listening Guide–the latest. While I like to have an annual guide, I actually believe this guide will be valid for several years. True, some programming comes and goes–as we’ve seen shortwave stations leaving this year–but, Figliozzi also actively maintains a companion website, The Worldwide Listening Guide Online, which he keeps up-to-date with the latest changes; there is even a blog with his comments and news items. He tells you when to cross out and change listings in your WWLG as programming evolves.

In short, I like the WWLG and have decided that it will become a permanent reference book in my shack, along side my trusty WRTH. There is a surprising amount of information packed into this slim, spiral-bound book. Enough to keep even the seasoned DXer happy for years.

The Worldwide Listening guide can be purchased here:

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CNET reviews the Grundig G2

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Joshua Goldman, with CNET, has written a review of the Grundig G2. What’s more, he offers a fairly thorough review of the Grundig G2’s features and design.

First of all, I’m very impressed that CNET would bother reviewing a shortwave radio at all. Typically, I look to CNET for reviews of portable hi-tech like cell phones, iPods, cameras, computers, and the like; to see them review a shortwave seems like a broad-minded effort.

However, the focus on the G2’s actual shortwave performance was glossed over, at best. The reviewer merely writes:

If you’re most concerned with pulling in FM stations, you’ll be happy with the G2 Reporter. Even some stations that I’ve found difficult to tune with other portables came in strong. Tuning of AM and SW was good, too, but less reliable than FM.

And…that’s it. So much for the G2’s shortwave.

So, though this is not a review of the merits of the Grundig G2 as a shortwave radio, it does cover the radio’s recording features, battery, .mp3 and .wav file playback, battery, design, and similar features. Which, at least, is a step in the right direction.

Click here to read the entire review.

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A Review of the Bonito 1102S RadioJet 24 bit IF Receiver

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Bonito’s Dennis Walter at the Bonito booth in Hara Arena at the 2012 Dayton Hamvention

At the Dayton Hamvention this year, I met Dennis Walter, who is with Bonito, German manufacturer of the 1102S RadioJet. Dennis was kind enough to loan us a radio for review on SWLing.com. I have been evaluating the Bonito 1102S RadioJet over the course of eight weeks and have formed some impressions about its performance. And while I haven’t made any A/B comparisons yet with either the Microtelecom Perseus or the WinRadio Excalibur–both on my review table at the moment–I have taken the time to get to know this lean, high-performance IF receiver.

First impressions

The RadioJet box (left) is about the size of the highly portable Tecsun PL-380 (right)

When I first held the RadioJet, I was amazed at how small and sturdy the unit is. It’s built quite well; I expect you would have difficulty putting a dent in its aluminium body. It has a very small footprint on the desktop and fits very easily in my suitcase. Specifically, the RadioJet box is about the size of the highly portable Tecsun PL-380—in fact, the PL-380 is slightly wider than the RadioJet.

And though I knew about this feature in advance, what really stands out is its lack of dependence upon a power cable or a DC-in jack on the back of the unit. Indeed, the only two connections are a USB port and a female BNC connector for the antenna. The RadioJet derives its power directly from the USB cable. This is a major plus, providing additional freedom, as there’s no need for an external power supply or “wall-wart” type DC adapter. With the radio and USB cord, you’re ready for radio on-the-go—as I was on my recent DXpedition family vacation, when I reviewed the RadioJet.

Plug and play

Installing the RadioJet is very simple. You simply plug the receiver into your computer via the supplied USB cable, then install the RadioJet software via the supplied installation disc. As far as I know, the RadioJet software only works with Windows PCs. I tested the RadioJet with my Toshiba Satellite 64 bit Intel core i3 laptop computer.

I had no difficulty getting the RadioJet running. Indeed, it worked after the first software install. In my experience, it was true plug-and-play.

Is the RadioJet an SDR?

To be clear, the RadioJet is technically not an SDR, it is an IF receiver, more like the Ten-Tec RX-320D. I’ve certainly been guilty of calling it an SDR in the past as it’s easily to lump it in the same category. Within this review, I do compare RadioJet features with SDRs currently on the market since it is software (PC) controlled, has many of the same features as an SDR and directly competes with them.

Software and Usability

Unquestionably, the Bonito 1102S RadioJet’s software offers the most flexibility of any Software Defined Radio (SDR) or IF receiver I’ve ever reviewed.

A screen capture from my Toshiba Satellite Windows 7 laptop (click on image to enlarge)

Having used several SDRs and IF receivers–including the Microtelecom Perseus, Ten-Tec RX-320D, RFspace IQ and WinRadio Excalibur—I can state that the basic functions of the RadioJet are comparatively easy to locate. The graphic user interface (GUI), however, could appear somewhat complicated, particularly if you are new to software based receivers. While I like options and the ability to customize a user interface to best match my preferences, having a GUI that is both highly-adaptive and full-featured can be a double-edged sword until you become accustomed to it.

On one hand, you can customize the RadioJet GUI more completely than any other SDR I’ve ever used: you can change the window size, layout, spectrum display, and color palette; you can also load pre-designed screens to help with signal measurement, IF control, and AF control. Indeed, the RadioJet’s designers have also included a unique “Scanner and Signal Utilities” screen for working with utility reception.

On the other hand, there is a learning curve in both customizing the GUI and familiarizing yourself with the radio’s controls. This is why I wish the RadioJet had a proper owner’s manual. Early in my experience with the unit, while making setting modifications during a broadcast, I found I could lose my place within the control settings or accidently alter a setting that would result in degraded reception (such as the WAV volume, AGC, DSP or attenuator). I thought that the RadioJet was malfunctioning, only to discover that I had a setting adjusted incorrectly. Note that Bonito’s online support, however, has been very responsive in helping me when this happens.

The RadioJet GUI is the most flexible and adaptable of any software radio I’ve used

Fortunately, Bonito is fully aware that many listeners could be overwhelmed by the various options the RadioJet offers, and have designed the GUI so that if you minimize the window (as you would any Microsoft Windows “window”), only the basic receiver options will display.

The only major drawback I’ve observed with the RadioJet, as fellow reviewer Fenu mentions in his comprehensive review, is that its software still has a few trouble spots to be ironed out. This is not surprising, considering that is very new to the market. To be clear, software is a very important part of an SDR or IF receiver’s usability: after all, its interface is software defined. An SDR or IF receiver without the software is merely a small paperweight–but with it, becomes highly functional radio with a performance that can be enhanced with upgrades over time.

The success of the RadioJet over time will be directly tied to the responsiveness of Bonito to customer feedback. Like Fenu, my experience with Bonito is quite encouraging in this regard—Bonito has even provided remote desktop help sessions for individuals, and I can personally vouch that I’ve benefitted from this support. Bonito also closely attends to discussions on the RadioJet Yahoo Group, indicating that the company is listening to their customers. Bonito has been updating the software regularly—in fact, they’ve just added a noise blanker to the software which, I hear, effectively deals with electrical pulse noises like those produced by electric fences.

Tuning around

Though not required, if you don’t already have a mouse with a scrolling wheel, you will want one to tune and adjust the RadioJet. Band-scanning is pretty straightforward and there are a variety of methods to adjust the frequency:

Hover your mouse over the tuning knob and click to rotate clockwise or counter-clockwise
Hover over the digital frequency display and use the mouse scroll wheel to adjust each digit of the frequency up or down
If the display is expanded, there is also a number pad where you can click on each number to adjust
In the current revision of the software–much like with the Perseus–you cannot directly key in the frequency with the number pad of your computer

With the scroll wheel of the mouse, you can easily adjust most settings and filter controls of the RadioJet. It acts, in a sense and in most cases, as a proxy for a tangible knob you would have on a traditional radio. I imagine there are other (perhaps even better) peripherals that would work, too.

I do find the controls a bit frustrating to manipulate if you do not have at least a mouse with a scrolling wheel. I did not bring a mouse on my recent DXpedition and later regretted the decision. The track pad on my Toshiba laptop does not offer the accuracy and scrolling features needed to fluidly operate the RadioJet GUI.

Recording

The RadioJet audio recording and playback panel

Unlike a lot of SDRs on the market, the RadioJet does not have the ability to record large chunks of HF spectrum. For example, the WinRadio Excalibur and Microtelecom Perseus can record 2,000 kHz of spectrum; the RadioJet, however, is limited to 24 kHz. I asked Dennis at Bonito about this and he said that when designing the RadioJet the designers focused on the performance of the received signal and the radio’s overall efficiency rather than upon having a wide IQ output.

Bonito is catering to the discriminating DXer who is seeking the highest quality signal upon receiving, even among weak signals, but who is less interested in spectrum recording. Personally, I like to record and archive spectrum, but I do appreciate this focus upon delivering the best possible received signal, even with a very modest computer. Indeed, unlike most other SDRs on the market, the Bonito 1102S RadioJet reportedly works well on Netbooks with Atom processors. I can say that my Intel Core i3 laptop runs the RadioJet beautifully. I do plan to try the RadioJet on my netbook soon, as well.

RX and DX modes

One unique and highly-promoted feature of the Bonito 1102S RadioJet are the RX and DX “Channels” or operating modes. On the Bonito site, they show an example of a very weak signal showing up on the spectrum display, almost totally hidden in the band noise. When the user switches to the “DX Channel,” however, the noise floor drops and the received signal pops out, and becomes armchair listening.

Here is the video:

I have found that the DX Channel is indeed very effective at pulling a weak signal out of the noise. The RX Channel, on the other hand, does an even better job of receiving stronger broadcasts signals. The channels appropriately balance AF and RF gains along with the raw IQ to deliver the receiver’s very best under prevailing conditions.

The RadioJet RX/DX channel selection panel

I find that I switch between the two channels rather frequently, and tend to do so manually. There is a setting in which the RadioJet will automatically determine what settings should be used to best hear the target broadcast—it switches very quickly between the RX and DX Channels and even makes small adjustments to the AGC and other settings. Though quite effective, I still prefer to manually adjust these features to enjoy greater control of them.

Digital Radio Mondiale (DRM)

This is perhaps one of the most fluid and flawless features of this radio. Though I have not had an opportunity to record DRM yet, I have decoded several broadcasts with great success (REE, Vatican Radio and RNZI).

In fact, if you are looking for a an excellent DRM receiver, the RadioJet may be your best bet. Unlike many SDRs on the market, the RadioJet decodes DRM natively: in other words, you simply tune to a DRM signal and change the mode from AM to DRM. That’s all. Your software already has a built-in, paid-in-full decoder (no need for a costly plugin or DREAM license). It’s the best implementation I’ve ever tried.

Summary

When I begin a radio review, I keep a checklist of pros and cons as I discover them. In this way, I can remember my initial discoveries.

Here’s my list from the Bonito 1102S RadioJet:

The RadioJet derives its power from the supplied USB cable, the only two connections are the USB port and the antenna (BNC)

Pros:

Excellent sensitivity and selectivity
Low noise floor
Excellent DRM implementation
Customizable filters—some can actually be hand-drawn with the computer mouse to accomodate received signal conditions
Though I haven’t done an A/B comparison with the Perseus yet (coming soon!), but like Fenu, I expect the sensitivity and selectivity to be very similar
Operates without a separate, external DC power supply
Software and GUI are extremely customizable—the most flexible and resizable I have used (see con)
Audio fidelity, once adjusted, is excellent
Two modes of listening (RX and DX channels) allow for either manual or automatic settings for strong or weak signals (see con)
Technicians and support representatives from Bonito have been responsive to customer requests and feedback
Software updates are frequent and occasionally include new features
Since the RadioJet doesn’t use or have to process wide IQ, (see con) its 24 kHz bandwidth targets one broadcast and places emphasis on clean RX performance
Doesn’t require robust PC processing power, will even run smoothly on a netbook (per manufacturer—though I will test soon)
Scroll wheel on a standard PC mouse acts as a nice proxy for the many control knobs on the RadioJet GUI (see con)

The RadioJet software even has a unique map display of broadcasting schedules

Cons:

Software has some bugs and is not yet fully mature
Software and GUI are so customizable that they reqire a learning curve—could be a negative for SWLs seeking simpler functionality (also see pro)
No IQ output like the Perseus, WinRadio and RFspace SDRs, which allows for wide spectrum recordings (also see pro)
Software occasionally crashes
Sometimes when switching between RX and DX Channels, WAV volume settings are altered and not returned to original settings, resulting in a “splattered” or “hot” audio sound
Software controls are frustrating to use without a mouse—or by using a laptop track pad only (see pro)
Lack of a proper owner’s manual

Final thoughts

Overall, I like the Bonito RadioJet; I would certainly recommend it for the shortwave radio listener and DXer, especially one who wants:

raw performance
flexibility
portability
robust receiver control software package
good value for performance

I would also recommend the RadioJet to those who don’t want a receiver to task their computer’s processor excessively.

If you are looking for a mature, simple software defined radio—or if you need wide spectrum recording–you may want to check out a true software defined radio (SDR) from WinRadio, RF Space or Microtelecom.

In my opinion, the only drawback to the RadioJet, as of time of this review publication, is that the control software is not yet refined and still has a few bugs. None of these limitations have affected my ability to use the RadioJet, but they have proved annoying at times.

My impression of Bonito and their staff is that they are trying in earnest to respond to customer feedback and focus on delivering an effective receiver for the DXer and for those wishing for excellent performance on a budget.

If this attentiveness continues, the RadioJet should only improve with time.

The US price tag for the Bonito 1102S RadioJet is $689 through Universal Radio. This is fully $300 less than the Microtelecom Perseus. If you want serious performance, from a lightweight, rugged, flexible software controlled receiver, you should be pleased with the RadioJet.

UPDATE: Want to hear a broadcast recorded on the RadioJet? Check out my previous post on the final broadcasts of RNW. The RadioJet did an amazing job pulling this station out of the static.

Follow our tag “RadioJet” for updates to this review and future A/B comparisons with other receivers.

Keep in mind…

SWLing Post regulars know that I don’t post highly technical or “laboratory” reviews. Take this review as my experience as an experienced shortwave radio listener, where I focus on usability, receiver quality, and audio fidelity, and provide general operating notes. I also focus on helping consumers make purchase decisions, as I outline the pros and cons of each receiver. For a more technical review, I would refer you to previously-mentioned Fenu’s review and–potentially upcoming–Rob Sherwood’s receiver performance data.

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