Category Archives: QRP

Antennas, Morse Code, News, Portable, POTA, QRP, Reviews

Seven Park Activations in Six Days: A review of the adaptable Chameleon Emcomm III Portable antenna

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Weather in North Carolina has been absolutely stunning over the past week, with the exception of two days where the remnants of Hurricane Sally dumped torrential rain. Two cold fronts provided us with gorgeous clear skies and dry conditions before and after Sally’s visit.

Of course, what better way to enjoy the outdoors than taking my radios to the field?

Last Wednesday, after several hours of knocking out home projects, my wife and I decided to enjoy the fall-like weather and get lost in Pisgah National Forest. My daughters were also keen for a little outdoor adventure, waterfalls, and hiking.

And our canine family member, Hazel? Always up for an outing!

“Let’s go, daddy!”

Of course, my wife was throwing me a bone as she knew I was chomping at the bit to try the new-to-me Chameleon Emcomm III antenna.

CHA Emcomm III antenna

Photo Source: Chameleon Antenna

I decided I’d pair the Emcomm III with the amazing Mission RGO One transceiver (a rig I’ll be reviewing in an upcoming issue of The Spectrum Monitor magazine).

Up to this point, I’d never used a Chameleon antenna in the field.

Chameleon Antenna kindly sent me both the CHA Emcomm III and CHA P-Loop a couple weeks ago for an honest field evaluation (and disclaimer: at no cost to me).

And being honest? The overall length of the Emcomm III wire antenna was intimidating.  I’m used to field-ready wire antennas that are perhaps 30-41 feet in total length. The Emcomm III has a 73 foot long radiator and 25′ counterpoise! Holy smokes!

In my head, I imagined the only places I’d be able to use the Emcomm III would be in an open park with large, widely-spaces trees.

Turns out, I was wrong.

Two things make deploying the Emcomm III a breeze–even in the middle of a forest:

1.) An arborist throw line: this piece of kit has revolutionized my  field antenna deployments. Not only does it give me the ability to suspend antennas much higher than I could before, but also to raise/lower antennas with ease compared with fishing line.

2.) The Emcomm III also has a floating dielectric ring on the radiator wire that allows you to create a suspension point. In fact, there are a number of ways you can deploy the Emcomm III which, I see now, makes it such a popular antenna among POTA operators.

To the field!

The first activation was actually a “two-fer”–meaning, two geographically-overlapping POTA park entities.

Wednesday, September 16: Pisgah National Forest (K-4510) & Pisgah Game Lands WRC (K-6937)

Propagation conditions on Wednesday were so crappy I found myself breaking with QRP to run 40 watts with the Mission RGO One into the Emcomm III. (The Emcomm III can actually handle up to 50 watts CW, 100 watts SSB.)

I first deployed the Emcomm III by pulling the radiator over a tree branch about 50′ high with the balun and winder near the ground. I then unrolled the counterpoise stretched out on the ground.

After only snagging about eight contacts in 50 minutes (a very meager amount for the typical park activation), I decided to re-configure the Emcomm III Portable so that it would act more like a NVIS antenna and perhaps grab a few regional hunters on 80 meters. There was no way I was leaving the forest without my 10 contacts to validate the activation!

I reeled in the radiator and re-attached my throw line to the floating loop and reconfigured the antenna to roughly match this “V” shape with a lower (roughly 25 ft) apex point:

NVIS “V” configuration (lifted from the CHA Emcomm III Portable product page)

I used the RGO One’s internal ATU to match the 80 meter band 1:1.

I started calling CQ on 80 meters CW and, evidently, the POTA site auto-spotted me via the Reverse Beacon Network (RBN) because within a minute, I found myself at the other side of a mini pile-up! I very rapidly worked 8 stations–most of them were in nearby Tennessee. These were callsigns I was not used to logging because typically they’d be under my skip zone–a little too local.

It was nice to get solid copy on 80 meters without the deep QSB on 40, 30 and 20 meters.

The thing that struck me about the Emcomm III at this first activation was how easy it was to reconfigure in the field despite the lengthy radiator. The wire is Copper Clad KEVLAR PTFE (Telflon-coated) and doesn’t easily tangle. It slides so easily through the trees–there’s no coil or bulky bits to get caught in the limbs.

When packing up, it wraps around its built-in winder very easily. Kudos to the designer.

Saturday, September 19: Pisgah National Forest (K-4510) & Pisgah Game Lands WRC (K-6937)

Last Saturday, I wanted to try the CHA Emcomm III in a different region of Pisgah National Forest and see how well it might pair with my Elecraft KX2.

We found an ideal spot to set up: a forest service road that had obviously been closed the entire season.

I deployed the Emcomm III Portable in the same “V” configuration as I did during the first activation, but this time raising the apex of the “V” up to 45 feet.

It’s important to note here that being a random wire antenna, the Emcomm III relies an an ATU to get good matches on each band. The Mission RGO One’s internal ATU did a brilliant job finding matches and, turns out, my KX2 did as well.

In fact, before I started calling CQ, I moved across the bands to see if I could get good matches with the KX2 ATU. From 80-20 meters, I think the highest SWR I had was 1.3:1. (The KX series ATU is truly a benchmark in my book!)

That day, even though the weather was gorgeous, propagation was terrible.  I read a few reports from experienced POTA and SOTA folks who couldn’t snag the needed 10 contacts for a valid activation earlier that day. There were contests and QSO parties on the bands so lots of signals–but more than once on the phone portion of the 40 meter band,  I could hear two stations calling CQ on the same frequency and trying to work the same stations totally unaware of each other. Not a good day to play radio in the field and was starting to wonder if I could even snag my needed ten contacts.

Turns out, I had nothing to fear.

Since I could, quite literally, pick any band the KX2 could transmit on, I was able to float across the HF spectrum, call CQ, and the RBN would make sure I was spotted properly to the POTA network.

Getting that first ten is a great feeling!

I pretty effortlessly snagged my ten, and then a number to boot.

When I seek a spot to set up in a national forest, I often look for forest service roads with locked gates. When I set up on an unused road, it typically means I’ll have a high branch to hang the antenna and also a little space to deploy it without touching other trees. Our spot on Saturday was ideal.

Again, hanging and deploying the Emcomm III was effortless. I did bring about 12 feet of paracord with me this time allowing me to tie off the end of the radiator if I chose the “V” shape.

Monday, September 21: Mitchell River Game Land (K-6926) & Stone Mountain State Park (K-2754)

Monday was another stunning weather day.

I decided I wanted to finally make a pilgrimage to an ATNO (All Time New One) POTA site I’d been eyeing for a few months: Mitchell River Game Land.

Because propagation was fickle and this site was a good 3 hour round trip from where I was staying with family, I planned to use the Mission RGO One and run 40-50 watts or so.

However, when I got to the site, I realized I’d left the RGO One’s power cable at home. Fortunately, I still had my Elecraft KX2, so 10 watts would have to do.

I found a large parking pull-off area surrounded by trees. There was a ton of room to deploy the Emcomm III.

I decided to extend the radiator in a sloping configuration and elevate the 25 foot counterpoise.

The configuration was Identical to the one above , but the balun/center winder and counterpoise were suspended about 4 feet off the ground.

I fired up the KX2  and started calling CQ on 80 meters. The RBN picked me up and the POTA site auto spotted me. In a couple of minutes, I snagged my first three stations, then I heard no other calls, so moved up to 40 meters where I worked a big pile-up of stations. It felt like a mini-DXpedition at times. I loved it!

I even hopped on the phone portion of the 40 meter band and worked a few stations, getting respectable signal reports despite unstable propagation.

This activation went so well and the weather was so ideal, I decided to fit in another park that was only a 30 minute drive and was new to me: Stone Mountain State Park.

The thirty minute drive was relaxing and reminded me how much I enjoy this portion of the NC foothills leading up to the Blue Ridge Parkway and escarpment.

By the time I reached the park it was 1:30 pm on a Monday and I essentially had the place to myself (even though in my head I was preparing for crowds).

I had my pick of picnic spots so I found the one with the highest branches. One shot with the arborist throw line and I snagged a branch that must have been 45-50 feet high.

I first deployed the Emcomm III by simply running the radiator over a tree branch and laying the counterpoise on the ground–much like I did in the first Emcomm III activation and deployment.

I started calling CQ and worked about 4 stations, then nothing. The bands simply died on me!

After 30 minutes, I reconfigured the Emcomm III into a similar “V” shape I used at Pisgah National Forest with the apex at about 40 ft and the center winder and counterpoise elevated about 3 feet.

After some persistence, I finished off my ten contacts and then packed up–I spent about 70 minutes on the air and needed to grab lunch!

I honestly believe I would have found this activation even more challenging if I didn’t have an antenna that could snag stations on the 80 meter band since it was in the best shape that afternoon.

Again, I was very impressed with how easy it was to reconfigure the Emcomm III.

Tuesday, September 22: Tuttle Educational State Forest (K-2754)

After staying two nights with my parents in the Piedmont of North Carolina, I made my way back home to the mountains Tuesday afternoon. Again, the weather lured me back out to make just one more activation! (Let’s face it: the weather is a bit of an excuse).

One of my favorite parks that’s only a 20 minute detour off my path is Tuttle Educational Forest. It’s never busy there and they have a large picnic area with ideal trees for hanging antennas.

After searching through my main field pack (a Red Oxx C-Ruck), I found a spare power cord that would work with the Mission RGO One transceiver.

I didn’t have a microphone, though. That’s okay: it would be a CW-only activation.

Although I had the park to myself, I didn’t want to take up a large portion of the picnic area by deploying the Emcomm III in a sloping configuration similar to my activation at Mitchell River. I decided, instead, to be space efficient and use the “V” configuration once again with the apex at about 35 feet and the counterpoise on the ground. By doing this, the antenna footprint could almost fit within my picnic table area (although my counterpoise did snake into the woods).

I can’t remember how long I was on the air, but I do remember it was a breeze logging contacts that afternoon. Very enjoyable. I do love the Mission RGO One–the receiver is amazingly quiet, sensitive, selective, and signals simply pop out of the ether. It also sports silky-smooth QSK. Again, although I’m 90-95% a QRPer, it’s nice to push the juice a bit when propagation isn’t kind. The RGO One will push 55 watts.

The Mission RGO One ATU also snags excellent SWR matches across the band with the Emcomm III.

Emcomm III initial impressions

This past week, I gained some serious respect for the Emcomm III.

What impresses me most is its versatility and robust quality.

Don’t get me wrong: it’s not a magic antenna or anything. It’s essentially a random wire antenna.

What makes it such a fabulous field antenna, though, is its configurability. That and its uncompromised military-grade construction.

I shouldn’t have been so concerned about the radiator length as it’s actually pretty easy to accommodate and helps make this an efficient antenna on the low bands. (Look for me activating parks on 160 meters this winter!)

I believe I can deploy the Emcomm III anytime I have a half-decent tree nearby. I believe I could also use my 31′ Jackite fiberglass pole to extend one end or even the middle of the antenna if I wanted to go NVIS, but I would have to be careful to accommodate strain relief since the Emcomm III Portable is made of heavier materials than my EFT Trail-friendly antenna, for example.

I’m not sure I’d ever reach for the Emcomm III for a SOTA activation when I’d need to take a close look at weight and size. But for POTA? It’s brilliant. And, of course, for emergency communications (as the model name implies). The Emcomm III would also be an excellent addition to a radio club’s antenna arsenal.

The Emcomm III, like all Chameleon products, is designed and made in the USA. Since they use military-grade components, you pay a premium.   The Emcomm III is one of their least expensive products at $139 US.  Is it worth the price? Absolutely. In fact, I’m thinking about buying a second one to keep in my camper.

Click here to check out the CHA Emcomm III Portable.

Moreover, the Emcomm III has earned its place in my main field radio kit.  Now let’s just hope Chameleon doesn’t ask for it back anytime soon!

Note that there are actually two models of Emcomm III antennas: the Portable version ($139) I reviewed here, and a Base version ($149) which is much larger designed for permanent installation.

Thank you, Chameleon Antenna, for sending me the Emcomm III Portable for a proper field evaluation. I’d also like to thank Chameleon Antenna for agreeing to be a sponsor of QRPer.com! 

Antennas, Portable, POTA, QRP

A field antenna’s best friend: The amazing arborist throw line

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At least 95% of the time I’m playing radio in the field, I use wire antennas and suspend them in trees.

Since I do a lot of park activations for the POTA program, trees are typically very easy to come by and most of the time the park office doesn’t care if I hang an antenna in their tree for a couple of hours.

For years, I’ve been using a heavy steel nut–a nut that would fit a very large bolt–as a weight and attach it to fishing line. I then simply throw the nut into a tree and pray the fishing line deploys properly. I have reasonably good aim, so–on a good day–I typically only need one or two throws/tries to get the fishing line over a branch. On bad days? Well… let’s just not talk about that.

There are some inherent weaknesses in the fishing line/monofilament system:

First of all, I’m lobbing a heavy metal object into the trees. If it ricochets–and it eventually will–it can come back down to earth and land where you might not want it to (for example, on your radio, on your car, or on your friend’s head).  Fortunately, I’ve never hit anything or anyone as I’m careful to clear the area first, but unfortunately, I once had the nut hit a tree and come back down near me. That was a little scary.

Secondly, fishing line isn’t exactly recyclable and you simply can’t use it over and over. I get at most three deployments with a section of fishing line before it gets too stretched and unworkable.

Finally, fishing line is incredibly prone to tangle, especially near the end of the spool.

A Better Solution? The Arborist’s Throw Line

The arborist throw line is no recent innovation. For years, I’ve read recommendations from other ham radio operators who swear by arborist throw lines but I only recently decided to take the plunge after one very frustrating park activation where my fishing line knotted and almost got permanently stuck in a gorgeous tree. I’m very much a “Leave No Trace” kind of guy, so I was incredibly relieved when I was finally able to work the fishing line out of the tree.

When I got home from that activation, I ordered a Weaver Throw Weight and Line and a Throw Line Storage Cube. (Note: these are Amazon affiliate links that support this site.)

Forester Throw Rope folding/collapsible Storage Cube

I once talked with an arborist about throw lines and he stressed the importance of getting not just the line, but also a throw line storage cube. The cube allows you to both deploy and take up the line without any tangles or knots.

All in, I spent about $50.00 US for both.

Preparing the throw line

My arborist buddy gave me an important tip: the throw line needs to be stretched.

As you can see in the photo above, the throw line is packed in a bundle that’s easy to unroll. After you unroll it for the first time, though, the line has a “memory” of all those bends from its life in the package.

You can remove much of the throw line memory by tying one end of the line to a tree and stretching the line to its full length. The line is 150 (or so) feet long, so you’ll need an open space to do this.

The arborist in this video shows how this is done (I’ve queued it to the point in the video where he shows how to do this):

Knots

You’ll need to attach the throw line to the throw weight, of course.

There are a number of knots arborists use, but I’m a fan of the slipped simple noose knot. Perhaps it’s because it’s easy to tie even with semi-rigid line, it holds quite well and, most importantly, it’s easy to untie.

Looks like arborists use it too because when searching for an instructional video, the first result was from an arborists’ channel:

Throwing up!

There are a few different ways to launch a throw line into a tree.

Take my advice here: practice at home before you hit the field! It could save you a lot of embarrassment, although, admittedly, my at-home practice sessions gave my wife and my daughters good reasons to chuckle.

I’ve only been using the throw line for a little over a week, so I’m still sorting out which method works best for me. One thing I discovered very quickly, though: no matter which launch method I use, I can send that throw weight into a tree at least 60% higher than I could before.

No doubt, the throw line and weight really put the laws of physics in your favor!

Here’s a great video highlighting different throw line launch techniques:

In practice

I took the throw line to the field today for the first time and I’m very pleased with how effectively it works.

I was able to place my antenna on a much higher branch than I could have otherwise. It took me three tries today, but it had more to do with my poor aim. As with any skill, this will, I think, improve with practice.

The storage cube folds down flat and keeps the line from tangling

Besides the improved antenna height, I love that the line can be used over and over again. Also, it’s strong enough that should it ever get caught in a tree, I can pull it out without the line breaking.

I can also reel in the line at least three or four times faster than I could with fishing line. Simply flake it into the storage cube one foot at a time.

When the line has been stored along with the throw weight, you can fold the storage cube down flat, then fold and secure it into a compact triangle.

Are there any negatives with the throw line system? Here are a few I’d note:

  • Bulk. Even when packed down, the line in the storage cube take up much more space than fishing line. Although it easily fits in even my smallest backpack (the GoRuck Bullet), I’m not sure I’d take it on a long hike.
  • This system requires a little practice and skill–you can’t pull it out of the package for the first time in the field and expect perfect line launches.
  • The throw line is more conspicuous than fishing line. If you’re trying to be a bit stealthy–as many of us are these days during the Covid-19 pandemic–the bright yellow throw line will attract more attention and questions from other hikers/campers, etc.
One happy activator!

Even though it’s bulky by my standards, I see the throw line becoming a permanent part of my field kit and I expect I’ll use it on most of my POTA activations.

Have you been using a throw line to hang field antennas? Or do you use a different system?  Please comment!

Portable, POTA, QRP

There’s magic in one watt and a wire

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This past week, I hit the parks pretty hard while giving the lab599 Discovery TX-500 a good field evaluation. I managed to activate eight parks in the seven days I had the radio.

It was so much fun.

Today, I was going through my logs and was reminded of one park activation on the Blue Ridge Parkway in particular…

The activation was a bit impromptu (like most of my activations, if I’m being honest). My family packed a picnic, I grabbed the TX-500 from the workbench, and we headed to the parkway.

I set up the station on a picnic table and deployed my trusty EFT Trail-Friendly 40/20/10 meter end-fed antenna. I started calling “CQ POTA” on CW and within 15 minutes or so amassed the 10 contacts I needed to validate the activation. Signal reports were overall a little on the weaker side, but propagation that day wasn’t exactly stellar. I worked a few more CW stations, then switched to SSB.

I started my SSB run by trying to work a few “Park to Park” sites because my phone managed to load a list of POTA spots from my very dubious mobile phone connection. I heard a strong signal from a park and replied, “K4SWL, Park to Park, Park to Park!” No reply.

Typically, when you say “Park to Park” an activator makes your contact their high priority. So I was a bit shocked not to hear a reply. I tried again. Nothing.

Then I cycled through some of the radio settings and discovered I had left the radio set to one watt of output power. Earlier that day while testing the TX-500 in the shack, I checked output power levels by hooking it up to a watt meter and dummy load. I forgot to move it back up to 5 or 10 watts.

No wonder I was so weak on SSB! I increased power output to 10 watts (the TX-500 max output) and quickly confirmed that other park.

I worked a few more SSB stations, then packed up for the day.

When I got back home, I made a little map of my contacts.

On the map below, all of the green pins below were CW contacts and made with one watt of power. The red pins are SSB contacts with 10 watts. The yellow star is roughly my location:

I operate QRP (or, at least 12 watts and below) 95% of the time I’m on the air. On rare occasions, I’ll run up to 50 or possibly 100 watts. Besides the amazing portability QRP rigs offer, it’s so much fun to travel the airwaves on peanut power–whether I know it or not.

But I’m pretty sure I’m preaching to the choir here, right–?

I know this: there’s magic in one watt and a wire!

Morse Code, News, Portable, POTA, QRP, QRP Radios

One week and eight parks with the lab599 Discovery TX-500

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Over at our other radio blog, the SWLing Post, I’ve been publishing reports and videos of the lab599 Discovery TX-500 general coverage QRP transceiver. If you haven’t been following those posts, you might like to check out the following articles in particular:

Morse Code, POTA, QRP, QRP Radios

Mountain Topper MTR-3B power, speaker, and earphones recommendations–?

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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 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!

I love seeing how others build out their field kits! Please comment or contact me if you’d like to share yours here on QRPer.com!

Kits, News, QRP, QRP Radios

Frank builds the EA3GCY DB4020 Dual-band 40 and 20M QRP SSB Transceiver Kit

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The following article first appeared on our sister site, the SWLing Post:

Many thanks to SWLing Post contributor, Frank (ON6UU), who shares the following guest post:

Building EA3GCY’s DB4020 QRP Transceiver kit

by Frank Lagaet (ON6UU)

In May, I discovered via a newsletter that a new kit was available from Javier EA3GCY in Spain.  I was immediately sold as this was a kit from my favourite kit producer and it has 2 bands–it will also be able to do CW and there also will be a CW filter.

After building 2 MFT’s from Javier which work without problems, I needed to have the DB4020.  The MFT’s are for 20 and 40 mtrs and do DSB (double side band).  I did put them in a not-so-graceful box but they do what they are intended for which is QRP phone (SSB).   They came together without problems so I expected the same for the DB4020–I knew for sure when I saw the board:  all through-hole components (except for some capacitors which are factory soldered) and a lot of space on the board.   The board has been silk-screened with clear indications on where all components have to come and the manual has very clear instructions where each component has to be soldered with referral to a quadrant.  The manual provides a 252 quadrant page so it is a piece of cake to find where each piece goes.

What do you get?

Javier provides you with all components which need to be installed on the board and, of course, the kit board.  The components come in small marked plastic bags and all is well-wrapped up in bubble wrap.  The board is wrapped separately and that is put together with the component wrap which is then again wrapped up in bubble plastic.  All goes into an envelope.  Very well packed I must say.

Here’s a picture of the bags with components:

The silk-screened board:

I started with the resistors since that’s the easiest way. After that, I did the capacitors.  I like to solder in all flat components first, so next were the diodes and IC sockets followed by the elco’s.  The transistors were next together with all relays.  As you solder in the transistors one also has to mount the cooling heatsinks,  these cooling sinks are high and are ideal to protect the coils one has to make,  they also protect the polystyrene caps (which I always find vulnerable) when the board is upside down.

Many kit builders are afraid of winding the toroids in kits–don’t be!  It is easy.  Just take your time and follow the instructions given by Javier in the construction manual.  In this kit the builder has to wind 8 toroids:  6 are a single wire which goes through the toroid body,  1 is a toroid with 2 different windings, and 1 has a twisted pair which goes through the final toroid.  Be sure to measure the wire you need per toroid as instructed in the manual.  Javier gives some spare, so you can be sure.  You will also see that on next picture where the legs of the toroids have not been trimmed yet.  Once done I still had some centimetres of wire leftover.

Picture of the toroids ready to be soldered in:

Finally all other parts and pin headers went in,  jumpers were immediately put on where needed.

As I’m using a military-grade plastic box, I have to break-out some components like the display,  tuning encoder,  volume and rx control from the board.  I also have put an on/off switch on the box and already have the CW KEY connector ready installed. I also installed a loudspeaker in the box.  The SI5351 board and the Ardiuno Nano are the final components which go into the board after installing all wires.

Picture of the board:

I intend to attach a CW paddle to the box made out of a relay.  A HWEF tuner (from EA3GCY) which I was planning to incorporate in the box is I think a bit overkill. That HWEF tuner is already in a nice little box and would be a pity to dismantle,  also I’m running out of space in the box…  Maybe I can fit in a 9-1unun which would then give me good results on both bands…?

Maybe I will install a battery pack in the same box.

The box with board installed:

The box completed front side:

Mind you,  it still needs some additional switches for the CW part of the transceiver.

73
Frank (ON6UU)

Video

Brilliant, Frank! I really appreciate the video as well–sounds like the kit produces smooth audio and should serve you well. No doubt, that military box enclosure will survive even the roughest field conditions!

Click here to check out the DB4020 kit at EA3GCY’s store.

Portable, POTA, QRP, Reviews

An impromptu Parks On The Air (POTA) activation with the Xiegu G90

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Note: The following is a cross-post from the SWLing Post.

Yesterday, I was in my hometown helping my parents with a few projects. Around noon, I realized that I had a good four hour window of free time–a true rarity these days!

I had two fully-packed go bags in the car: one with my trusty Elecraft KX2, and one with my recently acquired Xiegu G90.  On the heels of a successful POTA activation this weekend, I was itching to activate a new POTA site.

I did a quick check of the POTA site map and decided a trip to the South Mountains State Park (K-2753) was in order. The park was a nice 30 minute drive on back roads, so why not?

I posted a quick announcement on the POTA website, and jumped in the car.

When I arrived at the park, I noted an excellent, easily accessible picnic site with a nearby tree to hang my EFT Trail-Friendly antenna. Since I hadn’t been to this park in many years, I continued driving to check out other potential POTA sites.

In the main parking lot, I spotted a ham radio operator’s car with a prominent callsign on the back window and a POTA bumper sticker. I couldn’t see their operating site from the parking lot and since we’re all trying to social distance these days, I didn’t bother searching for them to introduce myself.

While it’s certainly allowed to have two activators running a park at the same time, I really didn’t want to impose and certainly didn’t want to cause any QRM by operating on the same meter band.

Contingency plan

I had a “Plan B” in mind in case the park wasn’t accessible.  On the west side of South Mountains State Park there was another POTA site: the South Mountains State Game Land (K-6952). I started driving in that direction, then used Google Maps to help me locate the entry road. Turns out, it was an additional 35 minutes of driving! Still, it was a beautiful day so no complaints from me.

The road was typical of game land roads: gravel and washed out in places. I had to ford one creek. My Subaru had no problem doing this, of course. (I actually love off-roading, so secretly I hoped the road would be more challenging!)

About four miles in, I found a pull-off that was big enough for my car and had an ideal tree to hang the antenna. I backed into the site, opened the hatch on the Subaru, and used the trunk/boot as my radio table.

Within ten minutes I had the G90 on the air.

I started calling CQ on the 40 meter band and thanks to buddies Mike (K8RAT) and Vlado (N3CZ) I was spotted on the POTA website.

Although there was a fair amount of QRN on 40 meters, now that the G90 has an RF Gain control (with latest firmware v 1.74), I could easily mitigate it.

I worked a number of stations on 40, then decided to move up to 20 meters.

I was very impressed with the response on 20 meters as well. Fading (QSB) was very deep, however, so I kept contacts brief. At times, stations would call me, I’d give them a 59 report, and when they’d reply I could barely hear them (and vise-versa). It took a little patience and good timing, but I believe I worked everyone who called me.

In the end, I had a total of 27 contact in the log with about one hour of operating. Here are my log sheets:

After transmitting steadily for an hour at a full 20 watts, the G90 body was pretty warm to the touch, but it had operated flawlessly.

A great field radio

The G90 is a gem of a transceiver and has some features that make it ideal for field use.

For one thing, I love being able to keep track of my battery voltage on the display:

Also, the G90 has excellent selectivity. On both 40 and 20 meters, at times I could see adjacent stations on the spectrum display that would have bled over and created QRM on less robust receivers.

I also like the ability to control all of the major transceiver functions without  having to dive into an embedded menu. Adjusting the filter, RF gain, attenuator, and pre-amp, for example, is super easy.

I love the spectrum display, too. In the field, it’s nice to be able to find an open frequency by simply watching the display for a minute or so before calling QRL or CQ. It also allows me to see when folks are tuning up nearby to make contact with me.

Although I’ve been using a resonant antenna in the field, the G90 has a very capable built-in ATU.  Back home, I’ve used it and have been very impressed with its ability to find good matches. Yesterday, for fun, I was even able to get it to tune up the EFT Trail Friendly antenna on 80 meters! I doubt it would be efficient, but the ATU did find a 2:1 match.

The only two features I feel like the G90 is missing are a notch filter (both manual and auto) and a voice keyer. I’m sure a notch filter could be added in a future firmware update (others have been asking for this as well), but I doubt a voice keyer could be added as easily. In truth, the voice keyer is a bit of a luxury, but it’s a feature I use without fail on my KX2 since park and summit activations often require constant CQ calls. Being able to record a CQ and have the radio automatically send it allows the op to drink water, eat lunch, and relax between contacts.

This is a lot of radio for $450 US shipped. I’ve also learned that the G90 has a very active community of users via this Groups.io email list.

I had planned to sell the Xiegu G90 after my upcoming review in The Spectrum Monitor. I must admit: this transceiver is growing on me. It might be hard to let go of it.

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Portable, POTA, QRP

First time in the field with the Xiegu G90 QRP transceiver

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(Note: this post first appeared on our sister site, the SWLing Post.)

Earlier this week, I took delivery of a new Xiegu G90 general coverage QRP transceiver. I’m reviewing this portable rig for The Spectrum Monitor magazine. Although this Chinese manufacturer has been around for a few years, this was my first purchase of a Xiegu product.

I’ve had the G90 on the air from home for a couple days, but I feel like the best way to test a QRP transceiver is in the field!

Due to the Covid-19 lock-down and a number of our regional parks either being closed or severely limiting visitors, I haven’t made many POTA (Parks On The Air) activations this year.

Recently, however, North Carolina has been opening state parks and allowing visitor access to hiking trails and picnic areas, but keeping all facilities (stores, cafes, visitor centers, and restrooms) closed to the public.

Yesterday, our family decided to pack a picnic lunch and head to Mt. Mitchell State Park (POTA site K-2747). My wife knew I was chomping at the bit to play radio in the field and actually made the suggestion. (She’s a keeper!) 🙂

There were only a dozen people at the park so we essentially had the place to ourselves. Better yet, it gave me the opportunity to pick out the most ideal picnic site to set up and deploy my EFT Trail-Friendly 40/20/10 antenna.

The G90’s backlit color display was actually quite easy to read in the field. My phone’s camera filter made it look darker than it actually was.

My POTA activation was unannounced and I didn’t have Internet access to self-spot on the POTA website, so I started the activation old school by calling “CQ POTA” until someone happened upon 7286 kHz.

After perhaps 10 minutes of calling CQ, Greg (KE0HTG)–a helpful POTA chaser–finally found me and spotted me on the network.

I worked a few stations in succession, but summer QRN levels were incredibly high and I believed static crashes were cloaking would-be contacts. The G90 has no RF Gain [Actually, thanks to this feedback, I now know the G90 does indeed have an RF Gain control (firmware version 1.73 and higher).] I asked one kind operator if he would hold while I switched over to my trusty Elecraft KX2.

The KX2 did a much better job managing the noise and that same op was easily readable where with the G90 I could barely copy him. I suspect I could have tinkered with the G90’s AGC levels to better mitigate the noise, but I didn’t want to do this in the middle of an activation.

I worked about fifteen stations with the Elecraft KX2 on 40 meters.

One real advantage of the KX2 during a POTA activation on SSB is its voice memory keyer (of course, it also has a CW memory keyer). I simply record my CQ and have the KX2 repeat it until someone replies, then I hit the PTT to stop the recording. Not only does this save my voice, but it also gives me an opportunity to eat my lunch while calling CQ!

I eventually moved up to the 20 meter band and switched back to the Xiegu G90.

On the 20 meter band, the G90 handled conditions like a champ.

Someone eventually spotted me on 20 and I worked a few stations.

The 20 meter band was very fickle and unstable yesterday. For example, I struggled to finish a contact with an operator in Massachusetts, yet got a solid 59 report from Spain with only 20 watts.

No activation is complete without brewing a cup of coffee on the alcohol burner!

I had a great time with the G90 in the field. I can see why it’s become such a popular transceiver as it offers incredible bang-for-buck (it can be purchased new as low as $450 US shipped).

This week, the noise levels on the 40 meter band should be very high here in North America, so I plan to spend more time with the G90 settings and see if I can mitigate the QRN a little better. I’d welcome any tips from G90 owners.

And yes, I’m already eyeing a couple of parks to activate next week!

Post Readers: Please comment if you’re familiar with the Xiegu G90 or any of the other Xiegu transceivers.

Announcements, Hamvention, Kits, Portable, Product Announcements, QRP, QRP Radios

QRP Labs new QCX+ QRP CW/WSPR transceiver kit

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Many thanks to Pete (WB9FLW) who writes:

Hi Thomas,

QRP Labs has just announced the QCX+ which as the name implies is an upgraded version of the very popular QCX line of transceivers

To date almost 10,000 kits have been sold, here’s a brief overview of the the differences and new features made to this popular Transceiver.

The QCX+ is the almost same circuit as the QCX, with two very minor changes. QCX+ runs the same firmware as QCX, and has identical operational and performance characteristics. QCX/QCX+ firmware will always be compatible with both the QCX and QCX+. The evolution of QCX to QCX+ provides several improved features in physical layout, as follows:

1) Physical layout of controls and connectors

2) Optional enclosure

3) Additional and changed connectors

4) More spacious PCB, more than double the board area, with less densely packed components, and more test/modification points

5) Improved heatsinking

6) Three minor circuit changes

7) No microswitch key

Price has gone up slightly to $55, still no other QRP Transceiver on the market today comes close to the features offered by the QCX+ at this price point.

More Info:

https://qrp-labs.com/qcxp.html

Thank you so much Pete! You’re an enabler! Since I’m not at Hamvention right now, those radio bucks are burning a hole in my pocket. The QCX+ looks like a fun transceiver to build! Thanks for the tip.

News, QRP, QRP Radios

Icom IC-705 International Availability

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(Icom Press Release)

Icom Inc. will begin to ship the IC-705, a new all mode portable transceiver covering HF, VHF and UHF, for the Japan domestic market from the middle of June 2020. Shipments of the IC-705 for international markets will follow the release of the Japan domestic model. Timing of availability depends on the schedule of type approvals in each region. For the latest information about the availability in your country, please contact to your authorized dealer in your country. Icom Inc. is continuing to effect delivery of the IC-705 in the soonest time possible under the current circumstances caused by COVID-19. We thank you for your patience.