Tag Archives: POTA

Assembling a new compact field radio kit in the Red Oxx Booty Boss

The Red Oxx Booty boss sporting my add-on reflective yellow monkey fist zipper pulls

If you’ve been reading the SWLing Post for long, you’ll have already sorted out that I’m both a radio geek and a pack geek.

The LnR Precision MTR-3B transceiver

I recently purchased an LnR Precision MTR-3B QRP transceiver. I added it to my collection because the rig is so incredibly compact, it gives me the opportunity to keep a full HF radio kit in my EDC bag or packed away for one bag travels.

Now I’m building a full field kit for the MTR-3B in a Red Oxx Booty Boss pack I recently purchased specifically for this radio.

If you’re wondering why I’d build yet another field kit for the MTR-3B instead of simply using field supplies I already have, allow me to explain…

Field radio kit Golden Rule: Never borrow from one kit to feed another

I never violate this rule.  (Well, not anymore, at least.)

I don’t care if I’m building a kit around a portable shortwave receiver, an SDR, or a ham radio transceiver–my radio kits are completely self-contained and organized.

I’m actually plotting a whole series of posts about building portable radio kits and packs because I enjoy the process so much, but for now, I’ll keep my explanation short:

Because I have an active family life and can’t often prepare in advance for field radio time, my kits must be at-the-ready all the time. If we decide (as we are this morning) that we’re heading to a national park for a little hiking and a picnic, I know that when I grab my KX2 field kit, for example, I’ll have everything I need to do a Parks On The Air or Summits On The Air activation. I know my kit contains an antenna, all antenna accessories and hanging supplies, feed line, a fully-charged battery, microphone and/or CW (Morse Code) key/paddles, earphones/speaker, and a transceiver. It’ll also have the little bits we often forget like a pen, notepad, extra connectors/adapters, and even a few first aid supplies.

If you borrow from one radio kit to feed another, you’ll regret it later. I promise.

Case in point

The lab599 Discovery TX500

Here at SWLing Post HQ, I review lots of radios and have a special affinity for field radios. Many times, I either obtain a radio as a loaner from the manufacturer (like the lab599 TX-500), or I purchase a radio with the intention of selling it after the review (as I will with the Xiegu G90). In either case, I don’t want to build a specific field kit for that radio because it’s really only visiting SWLing Post HQ.

The Xiegu G90

When I first took the Xiegu G90 to the field, I felt confident I could simply throw together a quick field kit in one of my smaller backpacks. As I prepared for an impromptu POTA park activation, I discovered that I needed a coax feed line for the kit and the quick solution was to grab the one from my Elecraft KX2 field kit. Even though I knew that would be violating my Golden Rule–a rule I had adhered to for five years and counting–I did it because I was very pressed for time.  That activation went off without a hitch–a total success.

Fast-forward two days later and I had another opportunity to do a park activation, but this time I wanted to use my Elecraft KX2 because I knew I would need to hike into the site and I’d also have to both log and hold the transceiver on my clipboard while sitting on my folding stool. The KX2 is ideal for this as it’s compact and has top-mounted controls.

I hiked into DuPont forest, found an ideal site to play radio, starting deploying the antenna and quickly realized I forgot to put the feed line back in the KX2 kit. Doh! Without even a short piece of coax, I had no way to connect my KX2 to the antenna.

Fortunately, I happened to have a spare coax line back in the car and I also keep two extra BNC adapters in the KX2 kit. Still, I kicked myself as I hiked all the way back to the car. Had I only followed the Golden Rule that had served me so well!

In the end, it could have been worse. I still got to do my activation and hadn’t wasted a 2.5 hour round trip to the park.

You’d better believe the first thing I did when I got back home was to put the coax back in my KX2 field kit and my radio world order had been restored again.

Back to the pack!

I picked the Red Oxx Booty Boss for the MTR-3B because 1.) it’s an ideal size for a super-compact field kit, 2.) it can be carried a number of ways (on back, sling, and over shoulder), 3.) with straps detached, it’s compact & easily fits in my EDC pack and 4.) I love Red Oxx gear and love supporting the company. When you buy a Red Oxx bag, you know it’ll outlast you…not the other way around.

I also ordered reflective monkey fist zipper pulls to replace the stock zipper pulls so that the pack would be easy to spot, for example, on a forest floor at twilight.

Here’s what I’m putting in the Booty Boss:

Here’s the amazing thing: without realizing it, everything in this kit save my earphones was designed and manufactured in the USA. The Booty Boss was made in Montana, the MTR-3B in North Carolina, the Vibroplex antenna in Tennessee, the ABR cable in Texas, the Bioenno battery pack in California. My 20 year old Sennheiser earphones were made in Germany.

I think that’s pretty darn cool and certainly bucks the trend!

Within a week, my battery and cable should arrive and the MTR-3B field kit will be ready for adventure.

I can’t wait!


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A review of the Xiegu G90 general coverage transceiver

The following review of the Xiegu G90 originally appeared in the August 2020 issue of The Spectrum Monitor magazine:


A comprehensive review of the Xiegu G90 general coverage transceiver

My coming of age in the world of radio was during the era of big US and Japanese radio manufacturers.  Icom, Kenwood, Yaesu, JRC, and Ten-Tec––these were the icons of my youth. And, I freely confess, I developed a partiality for their products.

So when incredibly inexpensive transceivers from manufacturers in China started showing up on the market a little over a decade ago, I was…well, skeptical. Very.  Many of these radios were a fraction of the cost we had been paying, and some models looked like direct copies of radios that were already on the market…but these copies were all-too-often second-rate either in features or performance.

Thus, as it was my policy to invest in quality products, I continued to put my money toward US, Japanese, and European legacy manufacturers that I felt would be here for the long haul in the amateur radio and SWL communities.

Had I become a bit of a radio snob? I admit it…maybe I had. But in truth, I was simply waiting for a quality Chinese-made radio to come along and change my viewpoint.

Times have changed

Recently, I compiled a list of general coverage QRP transceivers for the SWLing Post. My buddy Eric (WD8RIF) pointed out that I neglected to include any of the Chinese-made Xiegu brand transceivers, all of which offer general-coverage receiving.

I know a number of hams who use Xiegu (pronounced roughly “SHEH-goo”) brand portable transceivers for Parks On The Air (POTA) and Summits On The Air (SOTA) activations, and like them very well.  So I decided to waive my doubts and check out Xiegu’s transceivers. I found myself intrigued with one in particular: the G90.

The Xiegu G90

At time of publication, there are three Xiegu models widely available: the G1M, X5105, and the G90.

The GM1 ($260) is a compact, four-band 5-watt QRP transceiver, while the X5101 ($520) is a 160M-6M 5-watt Double Conversion Superheterodyne QRP transceiver. Both look promising, but the G90 is a 20-watt 160M-10M transceiver sporting a 24-bit 48 kb/s sampling analog-to-digital/digital-to-analog converter at just $450. That’s the one I chose to investigate.

I found both the G90 receiver specs and 20-watt-output power very appealing, especially considering the modest $450 price tag. But I found this receiver has other impressive features:

  • Detachable faceplate with included separation cable
  • Full-color backlit display with both spectrum and waterfall
  • Built-in side panel extensions to protect the front face and back of the radio
  • General coverage receiver (0.5~30MHz) in SSB/CW/AM
  • Built-in automatic antenna tuner (ATU)

About the only feature the G20 doesn’t include is an option for a built-in battery pack. Certainly not a deal-breaker by any means, since more often than not I use an external LiFePo battery for field-portable radio work.

I made up my mind to bite the bullet and purchase the G90. I was incredibly curious whether it could compete with my Elecraft KX3 and/or KX2, and I also wanted to explore the capabilities of its general coverage receiver for broadcast listening.

I placed an order with US distributor MFJ Enterprises for a total cost––including shipping––of $467.95.

Initial impressions

I tend to review ham radio transceivers around the time they hit the market. One of the unique advantages of being one of the first people to review a transceiver is that I really have no idea what to expect in terms of performance, other than perhaps what the manufacturer’s reputation has taught me over the years. And if the manufacturer is fairly new to me––? Then it’s truly a roll of the dice.

The G90, however, had been on the market for quite a few months, so I simply avoided reading any in-depth reviews so I could form my own opinions. With that said, I knew in advance that this radio is already well-loved by a very active and enthusiastic community of amateur radio operators. So I had only to make up my mind, myself. I got to work.

Form-factor

When I first removed the G90 from its box, I was struck by its weight, build quality, and size. First off, it’s a heavy little radio. The Xiegu site notes that the weight of the radio is about 2.2 lbs (1 kg), but perhaps due to its compact size, it felt heavier to me. Indeed, when I placed it on my postal scales, it came in closer to 3 lbs 10 oz. Still a very reasonable weight for a portable radio, but a bit heavier than described.

Speaking of size, the G90’s shape is pretty unique. Looking at the radio head-on, it’s reminiscent of most portable QRP transceivers (like the CommRadio CTX-10 or Yaesu FT-818, for example) meaning that the front face is compact. The depth of the radio, though (or length, depending on how you look at it), is about 8.3 inches––or nearly 10” if you include the side panels––equivalent to many of my 100 watt radios.

The build quality of the G90 is truly impressive. Holding it in your hand, you feel like you’ve acquired a quality piece of kit. The chassis is very durable, the buttons have a tactile response, and both the front and rear are protected by built-in side panels (typically side panels would be a third-party addition for most radios).

Audio

Audio from the internal speaker, which is mounted on the top of the radio, is loud and punchy, a desirable attribute for a field radio. Better yet, when you port the audio to an external amplified speaker (headphone jack is on the left side of the radio head), fidelity is superb.

Display

The color TFT LCD screen measures only 1.8,” one of the smallest I’ve ever tested on a radio, but Xiegu did an admirable job laying out the interface so that it’s easy to read at any viewing angle. If you wear reading glasses to read a book, you’ll need them to read this display––some of the numbers and labels are tiny, but very sharp, crisp, and high contrast. I’ve had no difficulty whatsoever reading the display in the field.

What’s more, the spectrum display and waterfall are responsive and in real-time––there’s no delay or averaging which I especially appreciate when chasing CW and SSB signals. Although at first blush one might think the spectrum and waterfall are just too small to be useful, that would be a mistake. I was guilty of this prejudice myself, and now find I rely on the spectrum display to help locate unused frequencies, spot someone calling CQ, and even identify the relative proximity of an adjacent signal. Truly a helpful feature.

Bail

Unfortunately, there’s one very conspicuous omission on the part of the G90 designers: it has no bail nor feet of any sort to support the front of the radio and angle it for ergonomic operation. Herein lies my biggest criticism of this radio, because it truly needs something to prop up the front of the radio for comfortable operation, not to mention, to allow the bottom of the radio to dissipate heat effectively.

There are a number of third-party producers that will supply a bail for the G90, but many are clunky and expensive, and I feel an attached/integrated bail is always best.

Ad hoc solutions to the fore: in the field, I simply prop the G90 on my
Bioenno 15 aH LiFePo battery; in the shack, I use a small support stand I purchased for my Elecraft KX3. Not as good as a purpose-made bail, but this works.

Microphone

The microphone that accompanies the G90 is what you would expect from a mobile HF rig: almost all functions can be controlled by its backlit keypad. I have read a few reports of people dropping and breaking the supplied mic. Turns out, the Mic’s 8-Pin Modular Plug is configured like a number of Icom radio models, and a replacement mic can be purchased on Amazon for about $22.

Remote head

As mentioned earlier, the control head of the G90 can also be separated from the body for use in mobile applications such as a car, RV, or even in the shack. The real surprise here is that the separation cable is included in the package. I’m not sure I’ve ever owned a mobile radio that came with a separation cable––what a luxury! Great addition.

Internal ATU

Another surprise for a radio in this price class: the G90 has a built-in automatic antenna tuner (ATU). When I first made the decision to purchase and review the G90, I didn’t realize this, and in fact would have never guessed it to be a possibility in a $450 transceiver. What’s more, this ATU is one of the best I’ve ever used in the field: it’s quick to match, and seems to find a match with almost any setup. I almost wish Xiegu sold a stand-alone portable ATU so I could use it with my other radios that lack an internal ATU.

Power output

Unlike most of the portable transceivers on the market that have maximum output power of around 5-15 watts, the Xiegu G90 will pump out up to 20 watts. While 90% of all of my ham radio communications are accomplished at 10 watts or below, I’ve appreciated a little extra “juice” while operating in the field.

Note: due to the speed of my phone camera, not all of the LED segments of my battery pack are visible.

With all that’s packed into this transceiver, no wonder it’s a heavy little unit!

My conclusion here is that the G90 feels like a quality rig. But how does it perform? Let’s first take a look at how I evaluate the transceiver as a ham radio operator, then as a broadcast listener and SWL.

Ham Radio Operation

Over one month of operating the G90, most of that time has been in the field, as I’ve taken the radio along for a number of Parks On The Air (POTA) field activations. Although I’ll be commenting about the G90’s performance as a transceiver in general, keep in mind that I do so mainly through the eyes of a field operator.

Although I often dislike operating compact radios due to small buttons and complex embedded menus that supply knobs and buttons with multiple duties, I find operating the G90 surprisingly pleasant. All of the most important functions of the transceiver can be called up with one or two button presses. Obviously, a real ham radio operator played a part in designing the G90’s operation.

Tuning the G90 is a simple process. The main encoder, of course, allows you to tune up/down the band. By short-pressing the encoder knob, you can change between the hundreds, tens, ones, tenths, and one-hundredths of a kHz. In fact, it’s very simple to move around a band this way. The encoder action is defined by detents that you feel as you rotate the knob. Normally I’m not a fan of detends on a radio’s main encoder knob, but since this one is so small, I think I actually prefer it as a means to control the spinning action. There is no brake adjustment.

Upgraded G90 Encoder

The supplied encoder knob is made of plastic and has dimples on the front to give your finger a bit of grip as you tune up or down. Upon the recommendation of a friend, I purchased a third-party dimpled aluminum knob to replace it––a major upgrade for a modest $8 investment!

Changing between bands and modes is very simple with the G90. There are dedicated band and mode up/down buttons on top of the radio’s front panel much like those on the venerable Yaesu FT-817 and 818 series. The G90 defaults to ham radio band allocations, but there is a menu setting that allows you to also include broadcast bands between band changes. Nice touch.

There is a dedicated AF gain control on the front of the radio. After receiving the radio, I was disappointed by the lack of an RF gain control, something I use a lot during noisy band conditions. Fortunately, Xiegu included an RF Gain control in one of the latest firmware updates: to access it, simply press and hold the AGC button, then make adjustments to the RF Gain percentage with the main encoder. The G90 defaults to a 50% setting. While I’m not really sure what this setting means, I do find the RF gain control quite effective, even though it doesn’t respond like a legacy receiver’s RF gain control.

The Xiegu G90 has a simple and effective variable-filter control: simply press the FUNC button then the CMP button, and use the encoder to adjust the low end of the filter.  To adjust the high end, press the FUNC and NB button in the same way. I love the fact that the filter can be adjusted from both the high and low ends, and that it’s variable instead of set at predetermined fixed widths such as “wide” and “narrow.”  All mode filters are adjusted in this fashion.

CW Mode

The G90 is a capable CW transceiver and should please the CW operator. The keyer speed, ratio, auto modes, and paddle setup are all accessible from the KEY function button. By pressing the FUNC and Key buttons, you can access the CW volume and tone parameters. The G90 also allows you to turn on a QSK function and adjust the hang time. The G90’s version of QSK isn’t the full-break-in variety you might find in, say, the Elecraft KX series radios. Meaning, while the hang time is very short, if sending at high speed you won’t be able to hear another station break in between your characters. You will note a slight relay click. With that said, I find the QSK mode to be quite effective for my use because I’m not really a “full-break-in” kind of operator.

The yellow CW tune LED on the front of the G90. Some might find it distracting if engaged.

Speaking of CW, the G90 features a CW tune feature that indicates when you’ve locked onto a CW signal: a yellow LED will flash as CW is received. While I find this feature a bit distracting, I’m sure some operators will appreciate it. In addition, the G90 features a CW reader that will decode CW when a station is properly tuned in and isolated from others.

Note the CW decode at the bottom of the display.

In the field, this feature has helped me confirm call signs––but like most transceiver CW readers, it’s not always accurate, especially if the CW operator on the other end uses a hand key or bug. Still: a welcome feature.

SSB mode

Most of my operating time on the G90 has been in SSB mode, and I’ve been very pleased with the radio’s performance in this mode. The G90 allows you to adjust the mic gain and enable compression. I’ve gotten excellent audio reports from the numerous SSB contacts I’ve made on the G90.

I should note here that although I feel you get much more radio than you pay for with the G90, I do wish it had a voice keyer. Especially when I’m activating a park via POTA, I call CQ a lot. With my Elecraft KX3 and KX2, for example, I set the voice keyer to “beacon” mode which allows me to pre-record a CQ and have it playback the message on a loop with a few seconds in between to allow me to recognize anyone replying to my call.  I rely so heavily on this feature for SSB park activations, just to save my voice, I know the G90 can never displace my Elecraft field radios. Again, I wouldn’t expect such a feature in this price class, but it would make for a near ideal field radio.

Digital modes

One thing that surprised me about the G90––especially since it is an SDR––is that operating digital modes is less “native” than I would have expected. Many modern SDR transceivers make setting up for modes like FT8 relatively easy with both CAT control and often the radio itself is identified as a sound card, thus no external interface is needed. When I decided to try running FT8 on the G90, I was discouraged by the fact that setup is much more like that of a legacy radio. Indeed, many users have had communication issues with popular software packages.

Since I wanted to test the G90 as a field radio and since I do very little FT8 in the field, I simply omitted testing this functionality. I have read that many operators have, of course, been able to successfully use the G90 for digital modes, but be prepared to read through the G90 email discussion group (see link at end of article) for best practices.

Update: SWLing Post contributor, David White, brings up one fine point about the G90’s VOX control. “I use that feature for TX control when running any of the digital modes with the laptop audio in/out going through the rear AUX connection.” Thanks for pointing this out, David. VOX control really facilitates using digital modes because the radio can detect audio comping from the computer and engage transmit without having to use CAT control of any sort.

Receiver Performance

Overall, I’m favorably impressed with the G90’s receiver. Both sensitivity and selectivity are above par, especially for a radio in this price class. The G90’s noise floor is also very acceptable, though not as low as that of my Elecraft radios. I do find that with the G90, I often need to ride the RF gain control in our noisy summer band conditions. I find that by adjusting the RF Gain and selecting the most effective AGC setting, I’m able to achieve an excellent signal-to-noise ratio.

In a nutshell: the G90 packs a lot of performance in an affordable radio, especially if you’re willing to tailor the filter settings, AGC, and RF gain to best accommodate the conditions.

Field notes

I’ve been very pleased with how long I can operate on battery power with the G90. Even with the display backlit set to 80% and with the volume set to high, I found that the maximum amperage the G90 would consume was about 0.60 amps. While I wouldn’t consider that benchmark, it is respectable.

I also like the G90’s built-in antenna analyzer. By pressing and holding the POW button, the G90 will display a graph showing the SWR figures across your specified frequency range. A brilliant and handy feature in the field! It’s important to note, though, that during the test the radio is transmitting a little RF so don’t try it with a receive-only antenna.

I do find that the G90’s body gets pretty warm–downright hot–when activating a park. It’s no wonder, really, because I often end up calling CQ at five second intervals over the course of 60-90 minutes on average.  That’s demanding a lot of a fanless radio, thus it gets very warm to the touch. Still, while I never had any overheating issues, I’ve also never operated the radio in direct sunlight for extended periods of time and I’ve always propped up the radio so that air can flow underneath the chassis. Again, if for no other reason than to dissipate heat, Xiegu should have incorporated a bail or folding feet. As much as I love the front and back panel extension, I would have chosen a bail over these.

Broadcast listening

While broadcast listening is often an afterthought for most ham radio operators, it never is for me. I like to travel lightly and I like my QRP transceiver to double-duty as a tool for SWLing.

From day one, I have spent a great deal of time with the G90 across the broadcast bands.

Shortwave

One of the main reasons I decided to review the Xiegu G90 is because I found so little information out there about how well the general coverage receiver worked for HF broadcast listening.  The G90 has a frequency range of 0.5-30 MHz (SSB, CW, and AM).

But I couldn’t find a specification showing the maximum width of the AM filter. In a few display photos with the AM filter width was indicated as 5.4 kHz––if this was so, I concluded, it was fairly workable if not particularly wide. However, only moments after opening the box and putting the G90 on the air, I tuned to the Voice of Greece (9,420 kHz) and learned how to change the AM bandwidth.  I was very pleased to find that in AM mode, that indicated filter width is only half the actual width: this means the G90’s AM filter can actually be widened to 10.8 kHz––brilliant!

In short, I’ve been very pleased using the G90 for shortwave broadcast listening; it has exceeded my expectations. I find that in terms of both sensitivity and selectivity, it offers performance on par with a dedicated receiver.

For an idea of how the G90 sounds on shortwave with its internal speaker only, check out the following videos:

The Voice of Greece

Radio Nacional De España

Broadcast listening is basic with general coverage transceivers: the G90 has no synchronous detector with selectable sidebands, for example. G90 users have requested this feature in a future firmware update, but I wouldn’t hold my breath in anticipation. I imagine G90 developers will be more concerned with ham radio-specific functionality.

Mediumwave

Let’s face it: Asking the G90 or any ham radio transceiver to perform on the mediumwave/AM broadcast band is asking it to do something it was never designed to do.

With that said, I have been very pleased with the G90 on the AM broadcast band.

Audio fidelity is excellent, especially with the AM filter widened appropriately and when using an external speaker or headphones.

The G90 performs so well between about 900-1700 kHz, I have even done some proper mediumwave DXing with it.

Below 900 kHz, I’m still able to tune strong and weak stations, but I have found some odd behavior with imaging as I tuned down to 500 kHz: some stations would move across the spectrum display in the opposite direction to which I was moving the encoder. I suspect this may be due to a very strong local station near me on 1010 kHz that was overloading the front end.

Again, however, I never expected any reasonable performance on mediumwave–especially since many transceiver manufacturers intentionally attenuate those frequencies, so I’ll accept any quirks it may have here and consider any G90 mediumwave functionality at all simply icing on the cake.

Important caveat for the broadcast listener

While, overall, I’ve been super pleased listening to the shortwave and mediumwave with the G90, there is (at time of publishing) a major drawback for anyone who would like to use the G90 exclusively as a stand-alone receiver: there is no way to completely disable the transmitter. 

The lowest power setting on the G90 is 1 watt. While that’s not a lot, it’s more than enough to fry your amplified magnetic loop antenna, for example. So, please use caution.

Although you could make it more difficult to transmit by not hooking up the microphone or a key (of course), there’s no way to disengage the internal ATU. If you accidentally press and hold the TUN button, it will engage the ATU and transmit.

In addition, if you press and hold the POW button, you will engage the antenna analyser function which will also inject RF as it sweeps across the bands testing the antenna’s standing-wave ratio.

Based on a suggestion, I even tried setting up the G90 in split mode with the transmit frequency set well outside the meter band I was operating.  I thought by having the transmit frequency out-of-band, it would keep the radio from transmitting. Turns out, I discovered a bug in the G90. When you perform this procedure, it essentially bypasses the safeguards that keep an operator from transmitting out-of-band. Since this is public now, I assume it will be addressed in a future firmware update.

And, as careful as I am as an operator, I would never hook my G90 up to an active receiving antenna for this very reason. While I’m sure there’s probably a hardware modification to kill the transmitter section on the G90, it would be brilliant if Xiegu developers include a function via a firmware update to snuff transmit.  At the very least, perhaps they could devise a way to disengage the ATU and antenna analyser functions via firmware.

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 my initial impressions and observations. Here’s the G90’s list, from the first moments I turned it on to the time of writing this review:

Pros:

  • Amazing “bang-for-buck”––a lot of radio for the money
  • Crisp, easy-to-read backlit color display
  • Detachable control head, cables included
  • Built-in side panel protection for head and back
  • AM broadcast listening
    • Excellent shortwave reception
    • Capable mediumwave performance
  • 20 watts power output
  • Mic can control all-important radio functions, including direct frequency entry
  • Very good audio from internal speaker

Cons:

  • No built-in bail
  • No manual or auto notch filter
  • Very few options for customizing the display
  • (Minor) Firmware updates must be made to faceplate and transceiver body separately
  • MW: some weird functionality below 800-900 kHz (eg, images in opposite direction)
  • No voice keyer
  • No internal battery option
  • Cannot lower power output below 1 watt, cannot disable transmit
  • Bottom of chassis gets hot during prolonged periods of operation
  • ARRL and Sherwood testing shows key clicks in transmit

Conclusion

Despite the shortcomings above, I have to say: the Xiegu G90 has exceeded my expectations, and then some.

Without a doubt, the G90 is a solid radio and a steal at $450 US. If you’ve always wanted a field-friendly portable transceiver, but didn’t want to shell out a lot of money, you can buy the Xiegu G90 for the same price you might pay for a two year-old iPhone. Impressive.

Although the G90 is a budget radio, it doesn’t play like one. Performance is on par with a radio twice its price and not only does it pack a lot of extras––like an internal ATU, mobile-worthy control microphone and detachable faceplate––those extras actually work just as they should. Nothing about this radio feels “cheap.” In fact, I’d be more inclined to call it a little workhorse of a radio.

To answer a question I asked myself early in this process: will the G90 displace my Elecraft KX2 as my field radio of choice? No, but that’s because I already own the KX2 and find that it fits my operating style better than any other transceiver I’ve owned thus far. Yes, I still prefer the KX2’s operation, performance and versatility over that of the G90, but the former is more than twice the price when similarly configured.

I think the G90 would also make for a stellar beginner’s radio, as it is a totally self-contained station; simply apply power, and play!

In short, I’m pleased to report that I’ve finally found a very affordable radio that’s a solid performer, and I look forward to further offerings from Xiegu.

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Field testing the lab599 Discovery TX-500’s selectivity and ADC overload

So the lab599 Discovery TX-500 I’ve been testing the past week has been sent to Ham Radio Outlet. Over the course of one week, I activated eight parks with this QRP transceiver and if I’m being honest, I miss it already. It’s an awfully fun and incredibly robust  field radio.

On my last outing with the TX-500 (last Wednesday) I did an activation of the Blue Ridge Parkway and Nantahala National Forest. I operated CW and SSB and worked stations from Maine to Ontario, Illinois to Iowa, and Louisiana to Florida running 10 watts into my trusty EFT Trail-Friendly antenna.

While I’m evaluating radios I take lots of notes so I can remember detail when writing my review. In the field, I often take short video notes as well.

While finalizing my TX-500 review for the October 2020 issue of The Spectrum Monitor magazine, I rediscovered the following video note. I made this with my iPhone and assumed I might include a link in the TSM article. In the end, though, it was really a journal note for my review.

I thought I’d share it here for those who are considering purchasing the TX-500 and are curious how well the receiver handles dense RF environments. I had the CW filter width set to 100 Hz–had I intended to publish this video I would have likely cycled through various filter settings.

I believe one of the strong points about the TX-500 is its receiver. It has a very low noise floor, great sensitivity, and is obviously capable of handling close-in signals. The CW filters must have sharp skirts. I would love to see what Rob Sherwood’s tests would show (although if he’ll be evaluating one). For a field radio, however, it’s right up there with my Elecraft KX3 and KX2 in terms of selectivity–those two are certainly benchmarks in my book.

Click here to read all of our lab599 Discovery TX-500 posts, videos and field reports.


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lab599 Discovery TX-500: Hiking into Pisgah National Forest for a little field radio fun

Yesterday, I hit the field again with the lab599 TX-500 Discovery. This time, I wanted to give the radio a proper shake-out by hiking to my location with the entire station in my pack.

This TX-500 transceiver is on loan, so I haven’t built a custom field kit for it like I have with my other radios. To be on the safe side, I packed the rig and all of its accessories in my Red Oxx C-Ruck pack.

The C-Ruck is loaded with three antennas, two LiFePo batteries, DC distribution panels, extra adapters/connectors, and essentially everything I need to handle pretty much any field situation. I take it on every field activation when I can afford the space in my car/truck because it’s so complete and stocked, it’s like a mini shack in a bag complete with tools I might need in the field.

This radio bag was total overkill for a quick day hike into Pisgah National Forest and I did remove a few heavy items like a larger battery, my Wolf River Coils TIA vertical, and other extra accessories. But at the end of the day, my four-legged hiking partner (Hazel) and I both agreed that I would kick myself if I arrived on-site and realized I was short, say, one PL-259 to BNC connector.

Turns out, the C-Ruck was just what the doctor ordered. The TX-500 is so compact, it fit in the C-Ruck’s top flap pocket that holds my logging notepad. I used that top flap to strap down my folding three legged stool for the hike.

The best part was the C-Ruck made for a perfect field table! The front pocket of the pack (which contains supplies like a first aid kit, emergency tarp/sleeping back, protein bars, etc.) propped the TX-500 in place.

After finding a nice spot off-trail, I set up my EFT Trail-Friendly end fed antenna in short order, plugged it into the TX-500, plugged in my 6 aH Bioenno LiFePo battery, the TX-500 Speaker/Mic (which conveniently clipped o the C-Ruck top flap), and finally my homebrew CW key cable.

Since I had no mobile Internet service at this site–no surprise–I started the activation in CW which gave me the best opportunity to be auto-spotted by the Reverse Beacon Network (RBN) and for CW hunters to find me on the announced frequency via the POTA site.

I started calling CQ and was instantly rewarded with a string of contacts on 40 meters.

After working that small pile of hunters, I moved up to the 20 meter band, started calling CQ, and made this short video:

Shortly after making this video, I heard thunder nearby and had to pack up. I’d hoped to work a few stations on 20M in CW, then switch over to SSB and work more. I’m willing to tempt fate when it’s just rain, but I don’t play with lightening.

All in all, It was a very pleasant–although short–activation. Hazel and I really enjoyed the hike. Frankly both of us love any excuse to hit the trails or parks.

Hazel was more interested in squirrels than DX.

I’m finding that the TX-500 is a very sturdy and capable field radio with fantastic ergonomics.

This morning, I pulled out the scales and found that the radio, speaker/mic, and power cable all weigh in at 1 pound 9 ounces. That’s a lightweight kit by any standard.

Easy on batteries

Also, the TX-500 only seems to need about 110-120 milliamps of current drain in receive. That’s an impressive number for sure–right there with the benchmark Elecraft KX2. I’m pretty sure I could operate for hours with only my 6 aH LiFePo battery pack.

More to come

I still have the TX-500 for a week and hope to continue taking it to the field. I had planned to go out again today, but the weather forecast is dismal. Instead, I’ll chase some parks here in the shack!


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Let’s hit the field with the new lab599 TX-500 Discovery QRP transceiver!

Yesterday, I took delivery of a lab599 TX-500 Discovery QRP transceiver. Many thanks to Josh at Ham Radio Crash Course for shipping it here and Ham Radio Outlet for trusting me with this fine machine for the next couple of weeks.

I’ve been looking forward to this day for months–indeed, nearly a year.

A few initial impressions…

I won’t lie: the TX-500 is a gorgeous little transceiver and it’s solid.

The form factor is even a little smaller and lighter weight than I had imagined. I thought the multi-pin connectors on the side panels were the same size as, say, an XLR connector. Turns out, they’re much smaller and quite easy to use.

To put the TX-500 on the air, you’ll need to connect a minimum of three things: the power cable (terminated with Anderson Power Poles on the battery side), an antenna (BNC), and the speaker microphone. The TX-500 has no built-in speaker.

That’s all you’ll need if operating SSB. If operating CW, of course you’ll need to connect your key, but you’ll still need the speaker/mic connected for audio. That does make for quite a few things connected to the radio all at once.

The backlit display is high-contrast and easy to read indoors and in full sunlight. (And yes, that’s the Voice of Greece!)

In the spirit of full disclosure, I am not a fan of speaker microphone combos, but I’ll readily admit that the one with the TX-500 is about as good as they come. It feels durable and produces serious volume. The audio fidelity is obviously built around voice and CW, so it’s not ideal for HF broadcast listening, although it does have an external mono speaker port on the side of the mic.

If I owned this TX-500, I would order another speaker/mic 6 pin connector and build a headphone cable for broadcast listening and CW use. An easy fix.

For SSB though? The provided speaker/mic works. Indeed, it works quite well in the field because it’s so easy to hear.

There’s so much more to this radio, but I’ll save that for future posts and my full review. Let’s talk code…

Attaching a key

This morning, the first thing I did was fire up my soldering iron and make a CW paddle cable. (I hope HRO doesn’t mind–I didn’t exactly think to ask. Come to think of it, let’s just keep this between us, ok?). I soldered three wires to the supplied 5 pin connector (pins 1, 2, and 5).

To keep things simple, I hooked the TX-500 up to my Vibroplex single lever paddle which sports three terminals, making it easy to connect to the CW cable pigtail. Plus, heck, any excuse to play with the Vibroplex, right!?

CW

I was so eager to see how the TX-500 would perform on CW, that immediately after hooking up the key the first time, I checked POTA spots and worked two stations (WR8F in Ohio and NG5E in Texas) in rapid succession. Here’s a video of the exchange with NG5E:

Note that I used my iPad to make this video and, for some reason, the mic accentuated the clicking/clacking of my Vibroplex key. It’s not normally that pronounced. 🙂

CW memory keying

One of my complaints about the TX-500 when I read the final feature list a couple weeks ago was that it lacked CW memory keying. To me, this was a major negative because many POTA and SOTA activators rely on CW keyer memories to help with their logging workflow in the field. I certainly do.

lab599 must have been listening because I found out last week that they implemented CW memory keying in the most recent beta firmware update. Woo hoo!

I was sent the firmware file and this morning had no issues installing it in the TX-500 with the firmware application/tool.

After I sorted out how to record and play back the CW memories using the top row of function buttons, I was ready to hit the field!

I packed the TX-500, and headed to the Blue Ridge Parkway for a POTA activation!

CW POTA activation

I only had a brief period of time to fit in an activation today, so I kept it simple by going to the Folk Art Center which has a number of picnic tables. A park ranger once asked that I not hang an antenna in a tree at this particular site, so I used my Wolf River Coils TIA portable vertical antenna.

The Wolf River Coils TIA

Truth is, I feel like I always get more mileage out of a wire antenna than a vertical when running QRP, but I worked with what I had.

I started calling CQ on 7063 kHz and within 10 minutes worked five stations.

The CW memory keyer worked well. There is currently a two second delay before the TX-500 begins transmitting, but I’m guessing that can be fixed in a future firmware update.

Here’s a short video of the TX-500 memory keyer in action:

The TX-500 uses a relay to switch between transmit and receive, so you can hear clicking in the background. I had the recovery time set to the shortest interval which resulted in the maximum amount of clicking. Good news is the TX-500 body is so solid, the clicking is quite soft and muted–about the softest clicking I’ve ever heard in a transceiver. You could, of course, minimize relay clicks by setting the T/R delay to a higher number.

I’m very impressed with the TX-500’s low noise floor and filtering. Signals just seem to pop out of this thing.

I played radio for a while longer but was eventually chased off by a thunderstorm.

I must admit: for the first time, I wasn’t terribly worried if it started raining and the radio got a bit wet. The TX-500 is weather-resistant so can certainly cope with a sprinkle.

More to come!

I’ve set a personal goal to take the TX-500 to the field seven days in a row. I’m not entirely sure that’s realistic as I see the amount of thunderstorm activity in the forecast. Still, one must have goals, right? Plus, any excuse to hit the field and play radio!

Please comment if you have questions about the TX-500. I’ll do my best to answer as many as I can!


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Take the field and abandon the radio noise!

The most common complaint I hear from new SWLing Post readers is that they can’t hear stations from home on their receivers and transceivers. Nine times out of ten, it’s because their home environment is inundated with man-made electrical noises often referred to as QRM or RFI (radio frequency interference).

RFI can be debilitating. It doesn’t matter if you have a $20 portable radio or a $10,000 benchmark transceiver, noise will undermine both.

What can you do about it?

Since we like to play radio at home, we must find ways to mitigate it. A popular option is employing a good magnetic loop receive antenna (check out this article). Some readers find noise-cancelling DSP products (like those of bhi) helpful when paired with an appropriate antenna.

But the easiest way to deal with noise is to leave it behind.

Take your radio to a spot where man-made noises aren’t an issue.

Field radio

If you’ve been reading the SWLing Post for long, you’ll know how big of a fan I am of taking radios to the field–both transceivers and receivers. Not only do I love the great outdoors, but it’s the most effective way to leave RFI in the dust.

Sunday was a case in point (hence this post).

Let’s be clear: I blame Hazel…

Last week, I did a Parks on the Air (POTA) activation of Hampton Creek Cove State Natural Wildlife Area in Tennessee. It’s a beautiful area with a fantastic hiking trail (the Overmountain Victory Trail) in a relatively remote/rural area.

About 5 minutes before Hazel’s cow patty fun.

My family had a great time at the site–we enjoyed a picnic and I played radio–but Hazel (our trusty canine companion) decided to roll in a cow patty during our hike. Hazel thought it smelled wonderful. Her family? Much less so. And all five of us were staring at a two hour car ride together.

Fortunately, my wife had a bottle of bio-degradable soap we use while camping, so I washed Hazel in Hampton Creek. (Turns out, Hazel didn’t mind that nearly as much as getting washed at home in the tub.)

In all of the commotion I forgot to take my EFT Trail-Friendly antenna out of the tree. Doh!

The EFT Trail-Friendly antenna is incredibly compact and quite easy to deploy.

The EFT is my favorite field antenna for POTA activations. It works so well and is resonant on 40, 20 and 10 meters. With an ATU, I can also tune any bands in between. I’ve deployed this antenna at least 130 times in the field and it was still holding up.

I was bummed. Hampton Creek is nearly a four hour round-trip from my home. Was it worth the trip to rescue my antenna?

Fast-forward to Sunday: my amazing wife actually suggested we go back to Hampton Creek Cove on Sunday and also check out nearby Roan Mountain State Park. Would my antenna still be in the tree? Hopefully.

Whew! Still hanging out!

Fortunately, my antenna was still hanging there in the tree as I left it the week before. I was a little concerned the BNC end of the antenna may have gotten wet, but it was okay.

Mercy, mercy, so little noise…

I turned on my Elecraft KX2 and plugged in the antenna. Oddly, there was very little increase in the noise level after plugging in the antenna. That worried me–perhaps the antenna got wet after all? I visually inspected the antenna, then pressed the “tune” button on the KX2 and got a 1.4:1 SWR reading. Then I tuned around the 40 meter band and heard numerous loud stations.

What was so surprising was how quiet the band was that day (this time of year the 40M band is plagued with static crashes from thunderstorms).

Also, there were no man-made electrical noises to be heard.  This allowed my receiver to actually do its job. It was such a pleasure to operate Sunday–no listening fatigue at all. Later on, we set up at Roan Mountain State Park and did an activation there as well. Again, without any semblance of RFI.

When I’m in the field with conditions like this, I always tune around and listen to HF broadcast stations for a bit as well. It’s amazing how well weak signals pop out when the noise floor is so incredibly low.

It takes ten or so minutes to set up my POTA station in the field, but if you have a portable shortwave radio, it takes no time at all. None. Just extend the telescoping antenna and turn on the radio.

Or in the case of the Panny RF-2200 use its steerable ferrite bar antenna!

If you’re battling radio interference at home, I would encourage you to survey your local area and find a noise-free spot to play radio. It could be a park, or it could be a parking lot. It could even be a corner of your property. Simply take a portable radio outside and roam around until you find a peaceful spot with low-noise conditions. It’s the most cost-effective way to fight RFI!

Post readers: Do you have a favorite field radio spot? Do you have a favorite field radio? Please comment!

Also, check out these articles:

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Any advice on compact Lipo batteries, in-ear earphones with volume control, and portable amplified speakers?

The MTR-3B 3 band transceiver is about the size of a pack of playing cards.

SWLing Post readers: I originally published the following post on QRPer.com. I thought I might share it here on the SWLing Post as well since we’ve so many readers who regularly use compact battery packs, earphones, and portable speakers. I’m looking for some advice as I build a super-compact SOTA/POTA field kit around the Mountain Topper MTR-3B. If interested in helping me sort this out, read on:


I received my Mountain Topper MTR-3B last week, and I’ve already taken it on a POTA activation.

POTA Park Hampton Creek Cove

Last weekend, I decided to break it in on a POTA “two-fer” site: Hampton Creek Cove State Natural Area (K-6246) and The Overmountain Victory Trail (K-4577) in Tennessee. Hampton Creek Cove was actually an ATNO (all time new one) so it was a trial by fire!

POTA Park Overmountain Victory Trail

In short, the MTR-3B was marvelous. I’m so impressed.

As I mentioned in a previous post, I’m building a full SOTA/POTA activation kit for the MTR-3B. I already have a kit built around my KX2 and I don’t want to “borrow” any items from it (so I’m not surprised later in the field when an item is missing).

The TalentCell Rechargeable 12V 3000mAh Lithium Ion Battery Pack is the little black box.

For this activation, I powered the MTR-3B with this inexpensive 12V battery pack a friend recommended on Amazon.com (affiliate link). The battery pack is almost identical in size to the MTR-3B and works perfectly. The battery, charger and cable all set me back a whopping $25.

I also used my Whiterook paddle (which needs new paddle arms at this point) but that will soon be replaced with a set of N0SA portable paddles I recently ordered.

Since the MTR-3B has no volume control, I used a pair of 20 year old Sennheiser earphones I bought when I lived in Munich. These have been in a drawer for ages because I now prefer using in-ear earphones with silicon earpieces for better comfort and sound isolation. But the Sennheisers have one thing none of my other earphones sport: in-line volume control.

While the earphones worked well for this activation, I’d still prefer a set of in-ear earphones with in-line volume control. Any suggestions from MTR-3B owners? Also, I’d like a compact amplified speaker with volume control to carry as an option when needed. If you can recommend one, please comment!

I’m writing an article for The Spectrum Monitor magazine about portable power later this year. I noticed that a number of MTR-3B owners swear by 11V rechargeable Lipo cells that are used in the RC and drone markets. Many have a similar compact form-factor as the common 9V battery. I understand, however, some of these cells need special chargers and equipment to balance them.

I would appreciate any and all information about these batteries.

In the meantime, Rich (N8TGQ), recently shared a pic of his Mountain Topper portable pack. Check it out:

MTR Kit

I think it’s brilliant how he’s mounted everything on a compact plastic cutting board inside the case. Rich says that what he loves about this set-up is that everything is there, ready to go–simply plug in the antenna!

Please comment or contact me if you have any suggestions as I build out a compact MTR-3B kit!

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