Tag Archives: General Coverage Transceivers

The ALT-512: A new general coverage QRP transceiver

There’s a new QRP transceiver on the market: the twelve band ALT-512 by Aerial-51.

At first glance, you’ll see a similarity between the ALT-512 and the LnR Precision LD-11/Aerial-51 SKY-SDR. The LD-11 and SKY-SDR, are very similar, save the LD-11 is marketed to North America (via LnR) and the SKY-SDR to Europe. The SKY-SDR had several iterative upgrades, most importantly the dual-threaded software used in the firmware, which cut CPU latency in half. Both the LD-11, SKY-SDR and now the ALT-512 are made in Europe.

Click here to read my review of the LnR Precision LD-11.

ALT-512 Waterfall display (Photo: DJ0IP)

According to Aerial-51, the new ALT-512 is built on the LD-11/SKY-SDR platform, has the same chassis design but has many improvements over the SKY-SDR:

  • 4m Band
  • 2.4 in. Color Display
  • Improved receiver pre-amplifier
  • 2 transistors in the transmitter PA (was 1)
  • Waterfall in addition to the Pan-Adapter Bandscope
  • 4 additional front-panel buttons
  • User friendly front-panel adjustment of often used parameters (formerly embedded within the software menu)
  • FULL TS-2000 command set implementation
  • Built-in Sound Card; Digi Modes run using only one USB-2 cable connected to the PC. No additional hardware required.

If the ALT-512 performs as well as or better than its predecessor, it’ll certainly be a great little QRP radio and an excellent general coverage receiver for HF broadcast listening.

Pricing has not yet been posted, but Aerial-51 plans to make this transceiver available in the next few weeks.

Click here to check out the ALT-512 on the Aerial-51 website.

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Initial review of the CommRadio CTX-10 QRP general coverage transceiver

In the past two years few QRP transceivers have generated the interest of the CommRadio CTX-10. I’ve gotten no fewer than two dozen emails from readers asking about the CTX-10 after learning I had one here at SWLing Post HQ.  And, I’ll freely admit, I was among those people who couldn’t wait to give this promising little radio some on-air time––and, as a result, a proper evaluation.

The CTX-10 arrives in this simple box.

Everything included in the CTX-10 box.

There are a few reasons why the CTX-10 has stirred up so much excitement. Firstly, the CTX-10 transceiver is based on the excellent and well-regarded CommRadio CR-1/CR-1A receiver. Click here to read our review in a new window.

Fans of the US-made CR-1 and CR-1A appreciated the approach to the CommRadio design: simple operation, clever engineering, near-mil spec components and construction, superb receiver characteristics, as well as excellent audio. The classic CR-1 has all the essentials––multiple modes, filters, and the like––yet offers relatively few features when compared with other tabletop radios in its price class. It’s a simple get-on-the-air rig that feels like it’s engineered to last forever.  Indeed, its design approach reminds me of the Lowe receivers of days gone by.

Another reason for the unusual level of interest is that the CTX-10 has been in the works for a long time. It was first announced over two years ago in October, 2016, and only started shipping in July/August 2018.

Since then, there have been very few CTX-10 reviews posted…hence all of the email questions.

In early October 2018 Don Moore, President of CommRadio, sent me a loaner CTX-10 which I’ve been using regularly since, testing all aspects of this little 10-watt transceiver.

Even though I’ve had the radio for a while, I plan to post a final CTX-10 review in the SWLing Post in coming months. As you may know, I typically only keep a review unit two months before publishing an evaluation, so why the delay?  In short: I feel like the CTX-10 has some important updates/upgrades that need to come down the line, and I’m allowing time for these to be developed and tested before I issue a full and final review. So, if this is a rig that interests you, you’ll want to stay tuned for that.

In fact, due to a couple of quirks that only affected the first twenty production units, CommRadio has already replaced my initial review unit. I’ll detail these quirks below.

In the meantime, what follows is an initial review of the CommRadio CTX-10 with the most current firmware as of time of posting (1311). This review format is a departure from previous reviews as I’m only focusing on the pros and cons that might help future CTX-10 owners make a purchase decision.

Consider this initial review just a taste of the CommRadio CTX-10, not the full course.

CTX-10: The Pros

First of all, much like the CR-1 and CR-1A, the CTX-10 is an all-in-one unit that takes fewer than five seconds to get on the air if you have an antenna at the ready. Seriously. Other than a key, and/or microphone and antenna, there are no other external attachments needed. It’s field-ready from the moment you remove it from the package.

True story: it took me all of thirty seconds to remove the CTX-10 from the box, plug in a key, an antenna, and have it on the air.  This is a major pro, in my radio world.

ATU

The CTX-10 has a built-in automatic antenna tuner that seems to do a great job making 1:1 matches on near-resonant multi-band antennas. I have a large horizontal multi-band delta loop here at the QTH, and the CTX-10 does a fine job finding a match on most ham bands.

Can it match the performance of the Elecraft KX-series ATU? I haven’t done an A/B comparison yet, but I don’t expect so—not on random wire antennas, at least. I do think, however, it will easily match any proper field antenna you pack in your go-kit.

Another minor plus worth mentioning? The ATU is very quiet in operation.

Internal batteries

The CTX-10 ships with three built-in #18650 3.7V 2600 mAh rechargeable Li-ion batteries that are user-replaceable. These are high-capacity cells—in fact, the same type of cells used in the Tesla Model S.

But how do they work? In short: brilliantly. They power the CTX-10 for a much longer period of time than the battery pack in my Elecraft KX2.

After a full charge, these cells will support casual operation for up to eight hours. If you’re using the CTX-10 in a contest or on Field Day where operation is intense––that is to say, near-constant transmitting––it should last the better part of an hour. Don Moore actually produced a video early on of the CTX-10 running a full 10 watts and transmitting dits in CW for forty solid minutes before the batteries depleted to the point of shutting down. That’s certainly a new benchmark for portable rigs with internal batteries.

The CTX-10 has an intelligent charger that will recharge the internal cells when any voltage over 5 VDC is applied. This means, in a pinch, even a typical USB charger will work. If the power supply can deliver up to ten watts, it’ll charge the batteries rapidly––anything below that will take a longer.

Elecraft KX2 (left) and the CommRadio CTX-10 (right)

I also own the Elecraft KX2 and have used it in the field more than any other portable transceiver I’ve owned up to this point.

The KX2’s battery charging routine is more involved than that of the CTX-10. The KX2’s pack must be removed from the radio (by opening the bottom plate of the chassis with two thumb screws, and unplugging the coaxial connector), then it must be hooked up to an external battery charger, charged, and then re-inserted in the KX2.

In contrast, the CTX-10 only requires plugging it into a power source that can provide anything from 5 – 20 VDC––in other words, pretty much any power source. All of the intelligent charging is built into the CTX-10.

Without a doubt, the CTX-10 has the most robust and well-designed internal battery charging system I’ve ever found in a portable radio. Period.

Best-in-class duty cycle

If you’re a fan of FT-8 and other high-duty cycle digital modes, you’ll be very pleased with he CTX-10.

Like many other hams, I was bitten by the FT-8 bug. FT-8 is an amazingly efficient digital mode that somehow manages to defy propagation—even when transmitting at low power. In the past, I’ve worked all time new countries on five watts!

The CTX-10 back panel.

At home, I designated the Elecraft KX3 as my primary FT-8 rig. First time putting it on the air, I found to be fairly effortless. However, after operating perhaps 15-20 minutes, I found that power levels decreased significantly. This is because taxing the finals with FT-8 produces a lot of heat, and the KX3 protects the finals by lowering the output power. KX3 owners wishing to play FT-8 for extended periods at 10 watts or higher know how important it is to purchase an aftermarket heatsink to give the KX3 more transmitting time.

The CTX-10, in contrast, needs no aftermarket additions—if anything, it’s over-engineered. The entire chassis of the radio is essentially a heat sink, and because of this, it requires neither additions nor a fan to cool the finals, leading to comparatively effortless operation. Plus, as a result, operation is completely quiet.

In short? No overheating finals with the CTX-10: it’s an FT-8 beast!

Receiver performance

Overall receiver performance is what I expected: identical to the CommRadio CR-1/CR-1a receiver series with the added benefit of an internal ATU that helps tweak the antenna match on the ham bands. A very good thing.

In addition, the CTX-10 has custom multiple preselectors to assist in ham radio operation and broadcast listening. Though I haven’t tested the CTX-10 in RF-dense environments like Field Day, I expect it will hold its own. Trust me, it’ll get its turn this year at the 2019 Field Day event.

Both sensitivity and selectivity are excellent. The receiver also has a very low noise floor and produces excellent audio fidelity especially when paired with headphones or an external speaker.

In general, I prefer the CTX-10 audio characteristic over that of the Elecraft KX series.

Simple operation

You can tell that CommRadio has a legacy in designing equipment for the military, as well as for commercial and aviation industries. The CTX-10 smacks of a channelized commercial radio. There are relatively few features and adjustments as compared with, say, the Elecraft KX2 or the LnR LD-11. For those who like basic controls, the CTX-10 should please. On the other hand, if you like more granular control of your transceiver, you might prefer more refinements.

Quality engineering and construction

Like the CR-1A, the CTX-10 enclosure is aluminum with machined aluminum knobs. The boards and internal components are near (if not) mil-spec––brilliant quality that is found in few other radios.

The OLED display is easy to read at any angle and under almost any conditions you might experience at home or in the field––truly best-in-class in this regard. It is a relatively small display, but crisp and high-contrast, so quite easy on the eyes.

The circuit boards inside are of the highest quality, and so are the components. Don Moore sourced them from the same suppliers he uses for commercial-grade equipment.

My good friend, Vlado (N3CZ)––radio engineer and repair technician––took a look inside the CTX-10 chassis; he was sincerely impressed by the quality of the construction and board design. It’s worth noting that Vlado isn’t easily impressed, as he looks at the internals of commercial and military grade communications equipment every day: thus it says something that he remarked on this rig’s quality.

CTX-10: The cons

I’ve covered the obvious positives, so what about the negatives?

What follows are the cons I’ve noted while operating the CTX-10.

Keep in mind, some of these cons may disappear with future CTX-10 firmware updates. Again, I plan to hold off on my full and final CTX-10 review until I feel CommRadio has essentially finished planned upgrades.

At least for now: only one VFO

Herein lies my biggest gripe with the CTX-10 and what I would consider a glaring omission on a $1,000 modern SDR transceiver.  However, it’s worth noting that CommRadio has committed to address this in an update–see below.

At time of posting, the CTX-10 doesn’t have A/B VFOs like almost all modern transceivers––certainly like all of its direct QRP competitors, like the Elecraft KX2/KX3, LnR LD-11, and Yaesu FT-818/817ND.

So, how does a lack of two VFOs impact operation? First of all, there is no way to operate split on the current version of the CTX-10. Ouch.

The first time I put the CTX-10 on the air it was at the QTH of Vlado (N3CZ). We put the CTX-10 on 40 meters, and one of the first stations we heard was in Vanuatu, due to a brilliant opening into the Pacific. Vlado was positive he would work them with 10 watts on his 40M Steppir Yagi––I was, too. This being the first time either of us attempted DX on the CTX-10, we plugged in Vlado’s Bencher paddles and quickly tried to sort out where the DX station was working his pileup.

It was then we realized that the CTX-10 had no second VFO to work split, and, hence, we couldn’t work the Vanuatu station––because, like pretty much any desirable DX, he was operating split. Frankly, I was in disbelief and quickly downloaded the latest CTX-10 manual to find out how to engage split, but there was no mention of it in the manual.

The only other option was to operate split using a RIT control to shift the receive frequency. Again, we couldn’t locate a RIT control and a search of the manual proved no mention of RIT because, alas, there is no RIT control.

Again, we couldn’t work Vanuatu on the CTX-10 because, like all good DXers, the Vanuatu team were operating split.

Update: CommRadio has informed me they will be adding A/B VFOs as soon as possible, certainly before the 2019 Hamvention in mid-May, but hopefully sooner.

Features may be too basic for some ham radio operators

It’s no secret: most of us hams like to fiddle with controls to tweak a transceiver’s performance. This is why ham radio transceivers often feature even more controls than their commercial/military counterparts.

The CTX-10 support feet are easy to flip up. The operating angle is excellent.

Still, some operators do appreciate a simpler rig, as they prefer simply to get on the air and get the job done. I appreciate this, too, especially when engaged in field operations where I’m less inclined to tinker with settings. So there’s some appeal in the CTX-10 approach.

At present, the CTX-10 feature set is very basic. Here’s a list of common controls the CTX-10 lacks––many that I’d typically expect in a radio of this price class:

No RF Gain control. The CTX-10’s RF gain is directly tied to the three AGC settings (slow, medium and fast). I know operators who never reach for the RF gain control, but I do, especially in the summer when it’s such an effective tool to lower QRN levels and help DX pop out of the background.

No microphone gain control. The CTX-10 lacks a mic gain control. The microphone input has a limiting pre-amplifier with built-in compressor and ambient noise gate. Problem is, at present, these settings are fixed and cannot be manually adjusted by the user. The CTX-10 was designed to work with handheld mics positioned closely to one’s mouth. Early feedback from users indicated that the CTX-10 was a little too aggressive, cutting off speech; a recent update did address this concern. Some users might never notice the lack of a mic gain control if they stick with the suggested modular MFJ-290MY or Yaesu MH-31A8J handheld mic. Personally, though, I like having a little more control of my microphone performance.

Keep in mind, there’s a plus side to the CommRadio ANG (Ambient Noise Gate): extended battery life. If you have the microphone keyed down, yet aren’t speaking for longer than a second or two, the output will be gated OFF, preventing background ambient noise from being transmitted. The on/off gating happens very quickly and isn’t noticeable.

The CTX-10 currently has no passband (PBT) control, notch filter or noise blanker.

Microphone compression is also pre-configured, and there’s currently no way to manually adjust it. This is a design choice typical of commercial communications gear.

No QSK/full break-in operation. The CTX-10, like the LnR LD-11, uses a traditional relay for switching between transmit and receive. Some CW ops like to hear the received audio between the dits and dahs of their sent CW. Elecraft radios, for example, use PIN diode T-R switching to eliminate relays during QSK. The CTX-10 uses a relay, so during CW operations, you’ll hear the relay click when switching from TX to RX and back again. This isn’t a problem for me, as I rarely set my CW rigs for full break-in, but the CW hang time delay on the CTX-10 is not currently adjustable. For high-speed CW ops that prefer a faster relay recovery, I suspect this could be an annoyance.

Limited CW adjustments. The CTX-10 lacks other controls many of us CW operators appreciate. Currently, the CTX-10 lacks a sidetone control––you cannot change the sidetone volume, nor can you turn it off. I believe CommRadio plans to fix this quirk in a future firmware upgrade. Additionally, you (currently) can’t change which side of your paddle sends dits and dahs without re-wiring your paddle. A minor con, for sure. Still, most modern QRP transceivers allow you to change this from the radio––I imagine CommRadio could add this feature in the future if their customers want it.

In addition, when operating the built-in CW keyer at speeds north of 25 words per minute, both Vlado and I noticed that immediately following a TX-RX-TX relay recovery, CW keyer timing was a little flaky. We assumed there was a problem with our paddles (perhaps dirty contacts?), but that turned out not to be the problem. Difficult to characterize, but essentially: immediately after a TX-RX-TX relay recovery, it’s hard to form a word correctly. The letter “Y” might come out as a “K” or “X” and  a “Q” might come out as a “Z.” Both Vlado and I believe this might have something to do with keyer timing, which is possible. Nonetheless, I’m confident this can be fixed with a firmware update. In addition, we worked my friend Mike (K8RAT) and while he had very positive comments about the CW tone in general, he did notice truncated elements following a TX recovery. He also noticed an occasional slight tone spike on the first element which seems to coincide with an audio pop we hear in the sidetone. Note: CommRadio is investigating, and has given this high priority––I’m hopeful they will sort this out soon.

Accident-proof ATU activation. As with the CR-1A receiver, most of the CTX-10’s features and options are controlled by accessing the menu system by pressing the volume control knob. To make ATU activation easy, CommRadio place the ATU function first in the menu––with one knob press, the ATU item appears, and with one more press the ATU activates and tries to find a match. Engaging the ATU, in my opinion, is just a little too easy. With two presses of the volume knob, the ATU engages––great, but I find this happening by accident simply by normal handling of the radio. Instead of two short presses to engage ATU, I feel it might be best when making one short then one long press.

One other minor note: the CTX-10 ATU configuration cannot be adjusted manually like it can on the Elecraft KX series ATU.

No keylock to prevent powering up and engaging ATU. The CTX-10 does have a keylock to prevent the encoder from shifting during operation (a great feature for FT-8, for example), but it lacks a keylock to prevent the main power button from being pressed and turning on while in transport. Even more worrisome would be turning on the unit and engaging the ATU while in a pack––I’m guessing this could eventually damage the radio’s finals. The current solution for this? CommRadio suggests tying a shielded wire around the post of the volume control. This prevents accidental pressing while in transport and the CTX-10 ships with one of these around the volume knob (to prevent it turning on in shipment). I feel a more elegant solution would be to design it so that, in order to power up the CTX-10, you’d press two buttons simultaneously: for example, the volume control and the STEP buttons. I’ve make this suggestion to CommRadio.

Minor concern: no noise reduction control. In truth, this is a very minor con in my opinion. I’m not a big user of DSP noise reduction, but some users expect it on modern transceivers. I feel like the CTX-10’s receiver is well-balanced so I wouldn’t reach for a noise reduction control under normal operating conditions.  That said, since there is no manual RF gain control, a variable noise reduction control could come in handy when QRN is heavy.

Size comparison: My ultra-compact C. Crane CC Skywave SSB sitting on top of the CommRadio CTX-10.

Minor concern: limited power output levels. This is a very minor gripe for me, but again could be important for other ops. At present, the CTX-10 has only three power output levels: 1, 5, and 10 watts. Thus for low-power contests, there is no way to lower the CTX-10 below one watt and no adjustment to zero watts. A couple of years ago my radio club had a DXCC 500 mW challenge to see who could work 100 countries with 500 mW or less. Most other modern QRP transceivers in this class have more nuanced control of power output and can be set to 1/2 watt.  At present, the CTX-10 cannot. This is truly a minor complaint––perhaps only important to 10% of CTX-10 owners at best––but I’m willing to bet this could be added via a firmware upgrade.

Early production run quirks now resolved

Fortunately, however, the CTX-10 is listening to their market, and has resolved a number of early production run quirks. My initial evaluation loaner unit was serial number #19. Turns out, some of the first production run units (including mine) had a couple of hardware quirks. CommRadio has replaced or fixed these issues when customers report them, and units currently in inventory aren’t affected. I list them here simply to document:

  • Resolved: Intelligent charger whine. When charging the internal Li-Ion cells, my evaluation unit produced a high-pitched audible whine. I measured the audio frequency with a simple smartphone app and determined that it hovers around 10.5 kHz. The replacement unit doesn’t have this problem.
  • Resolved (or repairable): Internal speaker distortion. The internal speaker on some of the early units was prone to vibrate against the bottom plate of the radio’s chassis. This produced a buzzing distortion on loud sounds or when the volume was increased above, say, 50%. Again, this only affected some of the initial production run units. The fix for this is quite easy, and either CommRadio will do this for you or you can do it yourself and get a warranty extension, so if you find this to be a problem with your early unit, contact CommRadio.

Conclusion

To my knowledge, the CTX-10 is CommRadio’s very first ham radio transceiver.  But it’s not the company’s first foray into transceiver equipment, as they’ve a solid history in commercial, aviation, and military electronics.

My biggest criticism of the CTX-10 is that I feel it should have never been released without A/B VFOs. Fortunately, this should soon be remedied. I trust this company, so I know they will follow through; I’ve even offered input on how split operation might be implemented with the A/B VFOs. Personally I wish the rig sported a little more in the way of CW controls, mic gain, and an RF gain control, too––but that’s my preference, controls I like to use. Again, the CTX-10 feature set might be a little too thin––too simplistic––for some hams.

That said, I never expected the CTX-10 to have the number of features that, say, the KX2 has––the CTX-10 isn’t intended to be a “Swiss Army Knife” radio like the KX2/KX3. In fact, CTX-10 development actually began around the same time the KX2 was introduced to the market, and its introduction didn’t deter CommRadio.

CommRadio firmly believes that the CTX-10 will still have appeal to current KX2/KX3 owners and QRPers who value their design philosophy of simplicity. And, what’s more…they have a point.

So, who is the CTX-10 for?

When I check out a new-to-the-market radio like the CTX-10, I always try to sort out who the customer is––what type of ham radio operator would reach for the CTX-10 over other transceivers.

After having spent the past few months with the CTX-10, I can tell you that the CTX-10 owner is one who values a very simple, straightforward radio––one that appears and functions more like a commercial or military channelized set. Perhaps someone who began operating in a commercial, military, or aviation field, and/or who likes the “get on and get the job done” approach.  Someone more interested in making contacts than in radio operations and refinements. Those who want a sturdy, lasting, no-frills, set-it-and-forget-it rig. If that’s you, take a closer look at the CTX-10–it may just suit your needs to a T.

The CTX-10’s overall construction and components are, as I’ve said, near mil-spec. The CTX-10 isn’t weatherized or waterproof––no more than any of its competitors––but the construction is top-shelf, for sure. It should run for decades without need of repair.

The whole body of the CTX-10 is essentially a heat sink.

I believe the CTX-10 will have strong appeal for radio enthusiasts who value:

  • All-in-one-box portability with no extra wired accessory components
  • Best-in-class internal battery life
  • Best-in-class intelligent battery charging
  • HF packs
  • A high duty cycle and no cooling fan noise or third-party heat-sink add-ons
  • Digital modes like FT-8 and the ability to operate them in the field from internal batteries
  • The equivalent of a simple portable military/commercial set
  • Robust audio from a radio’s internal speaker or headphones
  • A well-balanced receiver with few manual adjustments
  • Broadcast listening (the CTX-10 is also superb broadcast receiver)
  • Best-in-class hardware

The CTX-10 is built like a tank, and has brilliant receiver characteristics. It’s also designed and manufactured here in the USA, and I find it’s easy to get good support from CommRadio.

I will add that CommRadio has been very receptive to my constructive and frank criticism. A good thing, in my book, as lesser companies might take offense or simply be dismissive.

If you’ve been waiting to purchase the CTX-10, I hope I’ve given you enough information that you can make a decision.

If you have any specific questions, please contact CommRadio or comment, and I’ll do my best to answer. I hope to post a few videos of the CTX-10 in action within the next few weeks when my rather busy schedule permits.

Click here to view the CommRadio CTX-10 at CommRadio and at Universal Radio.

For a full list of CTX-10 features and specs, I would encourage potential owners to download and read the CTX-10 Operator’s Manual, available on the CommRadio website.


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The HobbyPCB IQ-32: A general coverage portable QRP transceiver with color touch screen now shipping

Many thanks to SWLing Post contributor, Pete (WB9FLW), who shares the following information regarding HobbyPCB’s much-anticipated portable transceiver which is now shipping.  The price is a competitive $529.00.

The following information comes from the HobbyPCB website:

The IQ32 is 5W output, 80-10M Amateur Radio transceiver with powerful 32 bit processing providing high-end features at an entry level price. The IQ32’s 3.2″ color LCD touch-screen display and dual control knobs provide an enjoyable operating experience in a robust package.

Available for immediate delivery!

Introducing the HobbyPCB IQ32 HF transceiver, based on the high performance RS-HFIQ RF system, the receiver in the IQ32 consists of 5 band-pass filters to reject out-of-band signals, an LNA with frequency dependent gain and a conventional quadrature down-converter. The transmitter features a Class A, 5W power amplifier with individual low-pass filters for each band to exceed FCC requirements for spectral purity.

The IQ32 features a large, color, touch-screen display providing an enhanced user interface and informative spectrum and waterfall displays found on radios costing much more. With a powerful STM-32 DSP processor, the IQ32 transceiver has variable filtering, multi-mode AGC, memory functions, built-in PSK encode/decode with keyboard support.

5W not enough power? Add a HARDROCK-50 to your station to boost up to 50W. The IQ32 and HARDROCK-50 seamlessly integrate together for a powerful mobile/base station!

Simple upgradeable firmware, no connection to a computer required, no drivers, no cables. Simply insert a thumb-drive with the appropriate file and the IQ32 updates its own firmware.

Specifications

  • Frequency Range: 3-30MHz (performance guaranteed on 80/60/40/30/20/17/15/12/10M ham bands)
  • Sensitivity: MDS < -128 dBm on 80M dropping to < -135 on 10M
  • Noise Figure: < 8 dB
  • TX Power: 5W typical, 4W minimum
  • LO Feed-thru: < -50 dBc @ 5W output
  • Spurious and Harmonics: < -50 dBc typical
  • DC Power: 13.8VDC, 2 amp max
  • Size: 172mm x 105mm X 75mm
  • Weight: < 700 grams
  • Display: 3.2″ Color LCD Touchscreen
  • Modes: USB, LSB, CW, PSK 31
  • DSP Processor: STM-32, 32 Bit

Click here to download the manual.

Pete also notes:

If one already has the RS-HFIQ board fear not an upgrade kit is available:

https://hobbypcb.com/products/hf-radio/iq32-upgrade

Thank you for sharing this, Pete!

I may see about grabbing an IQ-32 to evaluate. I’m very curious how its receiver might stack up to the Elecraft KX2, the CommRadio CTX-10 and the LnR Precision LD-11. (Please note that these links lead to my other radio site, the SWLing Post.)

It doesn’t appear that the IQ-32 has an AM mode, but I would still like to see how it might handle broadcast listening on the shortwave meter bands using ECSS.

I love the portable form factor and the fact that it ships with stand-off handles to protect the front face of the radio.

Video:

Check out WA2EUJ’s IQ-32 presentation from the 2018 Hamvention on YouTube:

Click here to check out the IQ-32 product page at HobbyPCB.

Have any Post readers purchased the IQ-32?  Please comment!

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The Elecraft KX3 continues to impress

I’ve owned my Elecraft KX3 for five years, and this little rig continues to amaze me.

In 2013, I gave the KX3 one of the most favorable reviews I’ve ever published–and it continues to hold its own. That’s why last year I recommended the KX3 to my buddy and newly minted ham radio operator, Sébastien (VA2SLW), who had already been eyeing the KX3 as his first HF transceiver.

A few weeks ago, Sébastien bit the bullet and is now the proud owner of a KX3 with built-in ATU. He purchased the KX3 with plans to do a lot of field operations including SOTA (Summits On The Air) and also use the KX3 at home.

Wednesday, I popped by Sébastien’s flat to help sort through some low-profile antenna options. I had suggested that he not invest in a factory made antenna just yet, but instead explore what he’s able to do with a simple wire antenna directly connected to the KX3 with a BNC Male to Stackable Binding Posts adapter. I’ve had excellent luck using this simple arrangement this in the past with the KX3, KX2 and even the KX1.

I did a quick QRM/RFI survey of his flat and balcony with my CC Skywave SSB. While there were the typical radio noises indoors, his balcony was pleasantly RFI quiet. At 14:00 local, I was able to receive the Voice of Greece (9,420 kHz), Radio Guinée (9,650 kHz) and WWV (both 10,000 and 15,000 kHz) with little difficulty. His building has incredibly thick concrete walls–I assume this does a fine job of keeping the RFI indoors. Lucky guy!

We popped by a wonderfully-stocked electronics shop in Québec City (Électromike–which I highly recommend) picked up some banana plugs and about 100′ of jacketed wire. We took these items back to the flat and cut a 35′ length of wire for the radiator and about 28′ for the ground. We added the banana plugs to the ends of each wire.

Sébastien temporarily attached one end of the antenna wire to the top of the fire escape and we simply deployed the ground wire off the side of the balcony. Neither of these wires interfere with his neighbors and neither are close to electric lines.

I had planned to cut both the radiator and ground until we found the “sweet spot”: where the ATU could find matches on 40, 30, 20 and 17 meters (at least).

Much to my amazement, the KX3 ATU got 1:1 matches on all of those bands save 80M where it still could achieve a 2.8:1 ratio.  I couldn’t believe it!

Frankly, Elecraft ATUs are nothing short of amazing.

Even the ATU in my little KX2 once tuned a 20 meter hex beam to 40 meters and found a 1:1 match to boot. In contrast, the Icom IC-7300 sitting next to the KX2 wasn’t able to match that hex beam even though we performed a persistent ATU search. Not surprising as I wouldn’t expect a 40 meter match on a 20 meter antenna, but the Elecraft ATU did it with relative ease.

Sébastian did a quick scan of the ham radio bands where we heard a number of EU stations. I also took the opportunity to point out how well the KX3 operates as a broadcast receiver with the AM filter wide open and using headphones in the “delay” audio effects mode. The Voice of Greece sounded like a local station–absolutely gorgeous signal.

It was getting late in the day, so I couldn’t hang around to call CQ with Séb, but I left knowing that he is going to have a blast playing radio at home and, especially, in the field. Next, he plans to build a simple mag loop antenna, get a BioEnno LiFePo battery and eventually add other Elecraft accessories to his station. I’d say he’s off to a great start!

Want more info? Click here to read my review of the Elecraft KX3 and here to read my review of the Elecraft KX2.

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Guest Post: Mark’s Micro Go-Box for the ICOM IC-7100

Many thanks to SWLing Post contributor, Mark Hirst, who shares the following guest post:


Micro Go-Box for the ICOM IC-7100

by Mark Hirst

You’ll be familiar I’m sure with the IC-7100 base unit and separate head unit design. It lends itself very nicely for vehicle installation.

Using it in any ‘portable’ situation however has always presented something of a challenge. A FT-857 or FT-891 can be carried as a single physical package with the head unit integrated into the body. The radios can sit and potentially operate on their tail in a backpack, with products like the Escort from Portable Zero making that process even easier.

I’ve had a few attempts at solving this portability conundrum, driven by a concern that there could be long term problems continually connecting and disconnecting the component parts for transport and operation, but knowing that a permanently assembled IC-7100 will always be an awkward dispersed structure.

My first solution was a Stanley 16 inch toolbox, which is fortuitously sized to accommodate the base unit and provides enough space to loop the original connecting cable and head unit. The box is not a bad fit, but certainly bulkier than necessary and leaves enough room for things to rattle around. When tilted vertically, the head unit can start moving.

Fast forward to this week when I discovered that the IC-7100 base unit will also fit inside a 5 litre XL storage box made by Really Useful Boxes:

http://www.reallyusefulproducts.co.uk/usa/
http://www.reallyusefulproducts.co.uk/uk/

The XL version of the 5 litre box has a taller lid, and as you can see from the accompanying photos, accommodates the base unit with the head unit sitting on top of it in a ready to use configuration. The tolerances for height are also exact, the VFO knob very lightly touches the lid, so don’t put something heavy on the box:

Once the lid has been removed, the radio can operate directly from the container:

To make the whole thing fit, I used a 25cm CAT 6 cable in place of the original connection cable and a significantly shortened power lead. As luck would have it, I created the shortened power lead a while ago because I often put the battery right next to the radio.

You can see that I removed a section between the power plug and the fuses, and now use the removed length as an extension should the battery be further away. Although it wasn’t my intention at the time, the main part is about 2 feet long, the secondary about 8 inches.

For transport, the power cable is coiled behind the head unit, ensuring the fuse holders sit in the void immediately behind it, while the microphone cable is coiled on top leaving the microphone resting inside its own coil. You can see the arrangement below:

In the next photo, you can see how the cabling emerges from the back of the base unit:

There’s just enough space for the power cable to leave the base and bend around without undue pressure, and likewise for the CAT 6 cable to curve round into the back of the head unit. Two angle connectors make the antenna ports accessible from above, while a short USB external drive cable provides access to the USB port for data modes and CAT control. A longer USB extension cable is attached to this short cable only when required, and the extension uses much more substantial ferrite chokes to mitigate noise from the computer.

To complete the transport package, I’ve cut out a kaizen style foam insert to make sure the base unit can’t move back into the cabling space, and another to make sure the head unit doesn’t slide towards the front.

The last problem of course is cooling. The fan is located in the front of the base unit, with slots along the sides and top to allow air flow. The box unfortunately is exactly the right size for the base, leaving no gaps for air to circulate. In the absence of a proper workshop or professional tools, I opted to use a hole cutter designed for putting pipes through wood panels. It turns out that plastic has a tendency to deform rather than cut under the blades due to friction heating. A sharp knife was essential in dealing with the effects of that deformation to produce the final smooth edges around the holes:

While I’m happy with the port exposing the front fan, the two holes on each side do not completely expose the side slots. Do I drill out the space between them knowing how tricky and flexible the plastic can be, and would a larger hole compromise the strength of the box? For now, I’m going to keep a careful eye for any temperature issues.

The current arrangement is to carry the box horizontally in a cheap travel bag:

Could the box be tilted vertically with the base unit nose down and carried in a back pack for longer excursions? Yes, but experience has told me that the lid latches on Really Useful Boxes have a tendency to pop open when you do that, so a luggage strap around the box may be required to prevent its very expensive cargo from spilling out. I’m also mindful that the box lid gently touches the VFO knob, so might put load on it in the vertical position.

The final result is something of a Swiss watch, and there isn’t much room for error. Things have to be arranged ‘just so’ to fit, but it does mean I can pack and pick the whole thing up in a handy container. The radio only needs a battery and antenna to be connected on site and then it’s ready to go.

There’s something oddly satisfying when unrelated objects come together like this. Who knew that this box was just the right size to fit the radio?

So, what do you think?


Thank you for sharing this project, Mark!

I love your Micro Go-Box: it’s practical, affordable and makes an otherwise awkward field radio easy to deploy and use. Looking at your photos, I realize that the IC-7100 does have one strong suit for field use. The IC-7100 front panel is tilted at a very comfortable 45 degree angle for use. 

Post Readers: What do you think?  Any other IC-7100 owners out there who take their rig to the field? Please comment!

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