For the past four days here at my mountain QTH in North Carolina, I haven’t seen the sun. The cloud ceiling has been low and our house has been in the middle of it. It’s been rainy and foggy with temps floating a few degrees above freezing.
Last Tuesday (February 9, 2021), however, we had one day with glorious weather and I’m so pleased I carved out 90 minutes to perform a park activation on my way back home from a short trip.
I picked Lake James State State Park (K-2739) because it’s such a short detour and has numerous spots where I could set up my gear.
The temperature was a truly balmy 60F/15.5C–possibly even a tad higher.
Lake James State State Park (K-2739)
On my way to Lake James, I knew I’d use my Elecraft KX2 (it was the only transceiver I had on this trip) but debated what antenna to deploy. I chose the Chameleon MPAS 2.0 vertical antenna because, to my knowledge, I had never paired it with the KX2 and I enjoy shaking up my transceiver and antenna combos.
The brilliant thing about antennas like the CHA MPAS 2.0 is how quick they are to deploy: it takes me all of three minutes or so.
On the air
Since the Elecraft KX2 has a built-in battery and built-in ATU, I basically connected the radio directly to the antenna and was on the air in moments.
The CHA MPAS 2.0 is the vertical equivalent of a random wire antenna: it’s not resonant on any one frequency and requires an antenna tuner to achieve a good SWR.
As I mentioned in the video (below) I always keep my expectations low when deploying a vertical antenna in areas like western North Carolina where ground conductivity is poor.
Maybe the antenna decided to prove me wrong, because I hopped on 20 meters CW and logged a number of stations across the country including Washington state and British Columbia with a measly five watts.
It also happened that my buddy and fellow POTA activator, Steve (KC5F), was just down the road activating another site in the same county. It’s rare that Steve and I can work each other because, typically, we’re too close for skywave propagation and too far for ground wave. Not this time! We were close enough for ground wave on multiple bands–it was great fun working him park-to-park on every band I tuned.
I moved from 20 meters to 17 meters, to 30 meters, 40 meters and back up to 20 meters SSB.
The great thing about using the MPAS 2.0 is how incredibly easy it is to pick up and move from band-to-band–there’s no manually tuning a coil or changing links on a multi-band diplole. In fact, the MPAS 2.0 covers 160-6 meters, so I’ve lots of options if band conditions are wonky.
Video
Here’s an unedited video of the entire activation:
In the end, here’s how my QSOmap looked with 32 stations logged:
I look back at activations like this and am reminded of the magic of HF radio. It’s truly phenomenal, in my mind, that with less power than it takes to light an LED bulb, I can make contacts across the continent pretty effortlessly–CW or SSB–even during the solar doldrums! Good fun!
In other news, my ankle is healing nicely and once this cycle of nasty weather clears, I’m looking forward to putting some SOTA sites on the air!
How about you? Do you have any field radio plans? Has the weather or C-19 lockdowns gotten in the way? Please comment!
The elastic straps inside the pouch keep the elements of the antenna organized and separated. They don’t hold the sections tightly in place, but they do the trick.
I store the two AX1 counterpoise wires (one for 40M, the other for 20/17) in its interior zipped pocket.
The Fatty pouch also stores a small Muji notepad and mechanical pencil (for logging).
I actually keep a logbook specifically for the AX1 because it’s so fun to see just how many miles per watt I’ve achieved with this pocket antenna.
I also like the clam shell opening.When I arrive on-site, I open the case and everything is arranged and prepared for assembly (which takes all of 2-3 minutes). Since every piece of the AX1 assembly has its own dedicated spot in the Fatty pouch, I can tell at a glance if I’ve forgotten something.
In the spirit of full discoure, you should know that besides being a radio enthusiast, I’m also a hopeless pack geek. I almost exclusively buy backpacks and travel gear from smaller manufacturers mostly located here in the USA. I support companies like Red Oxx, Tom Bihn, and Spec-Ops Brand to name a few. I have even helped pack companies with their designs and pre-production evaluations (much like I do for radio manufacturers).
Maxpedition is a US-based company that manufactures much of their gear in Taiwan (I believe). Although I originally purchased this Fatty pouch and two other Maxpedition pouches about six years ago, I can say their their quality and durability are superb. The zippers all work fluidly, seams are well-stitched, and I’ve never had one fail on me in any way. Their gear is more affordable than most of the packs I typically purchase.
I wish Maxpedition made a padded case that would fit my IC-705, Elecraft KX3, or even the Elecraft KX2 (although the Lowe Pro packs Elecraft sells seem to work well). I’ve never tested Maxpedition slings and backpacks, but I may give one a try soon. I would love input from any readers who are familiar with larger Maxpedition packs.
“Thomas, I read your review of the Xiegu G90 transceiver on the SWLing Post and it seemed your overall impression was positive. I bought a G90 some time ago and love it. So far, I’ve only been listening with it, but hope to pass both my Technician and General class license exams this month. Curious why you stated that you sold it after your review. Could you shed a little light on that decision? Inquiring mind here. Thanks so much for your articles and videos.”
Good question, Brian! And bravo on tackling both your Tech and General class license exams in one go! We’re rooting for you!
The short answer is it had more to do with my own personal preferences than the radio’s performance and specifications.
As I stated in my review, I think the G90 is a great value and certainly a capable field radio. It must be one of the most popular portable transceivers in the Parks On The Air (POTA) program (along with the Yaesu FT-891) which is certainly worth noting.
You would be hard-pressed to find a transceiver with the features of the G90–including an excellent internal ATU and 20 watts output–for less than $600 and the G90 is currently only $425 US.
If you have a limited budget, and like the overall specs and features of the G90, you really can’t go wrong.
Personal preferences
When I review a product, I do my best not to allow my own personal preferences to cloud my judgement. I try to imagine how I’d review a piece of gear based on being in a number of other operators’ shoes.
One of my pet peeves, in fact, is to read a product review and find that the reviewer is indulging in nit-picking and hyper-focusing on particular characteristics, features, and design shortcomings. I want to hear the negatives for sure, but I also want to feel comfortable that the reviewer’s personal preferences didn’t cloud their overall objectivity.
I also value real-word, hands-on experience in a product review.
After purchasing the Xiegu G90, I took it to the field and made a number of POTA activations with it. It never disappointed. I also used it in the shack for a couple of months. I found that the display was quite useful, easy to read, and it had most of the functions and features I tend to use in the field. Never once did I feel it was under-performing or not meeting my expectations. If anything, the G90 exceeded my expectations.
In fact, I remember telling some of my friends that the G90 was a “keeper” after taking it on a few field outings. But after my review, I found that I rarely reached for it when heading to the field. Why? Turns out some of my own personal preferences surfaced:
Memory Keying
Most of my other QRP transceivers have CW memory keying and/or voice memory keying. The Xiegu G90 does not.
For POTA and SOTA activators, voice and CW memory keying is a useful feature, as it frees you to do other things like log, eat a sandwich, or talk to others while calling CQ. In other words, it can help with your “work flow.” If you’ve watched my activation videos, you might have noticed that I tend to use memory keying for calling CQ and, sometimes, for sending 73s.
When walking out the door to hit the field, I tend to grab my transceivers that have memory keying functions.
Audio
The G90 has an excellent internal speaker for use in the field. With that said–and this is hard to describe–I find its overall audio characteristics a little “harsh” and unrefined. I found that, over time, the G90 gave me a bit of listener fatigue during long sessions in the field or shack. That’s not to say it has bad audio–it’s just not as good as some of my other transceivers.
Key clicks
ARRL lab testing shows that the G90 has key clicks in transmit. In fact, the key clicks were bad enough in their testing that they suggested never using the G90 with an external amplifier. For those of us who don’t use amplifiers, this may never be a factor at all. Also, Xiegu retailers sell affordable external amplifiers to pair with the G90, so I must assume it doesn’t affect all amplifiers negatively. If I’m being honest with myself, I think this was another nail in the coffin.
In summary…
I knew the G90 would collect dust, so I sold it.
However, I know operators who love the G90 so much, they sold their pricier rigs after buying a G90. I even know operators who own two G90s: one for the shack, one for the field. With a total investment of only $850, I see why they made that choice.
The G90 just wasn’t for me though.
A final note about the new Xiegu GSOC
Ironically, I was asked by Radioddity to evaluate the new Xiegu GSOC controller only a couple weeks after I sold my original G90. Since the GSOC is designed to pair with the G90 , they had to send me another G90 on loan for the evaluation.
If you have a G90 and have considered purchasing the GSOC, I would strongly urge you to read my latest review of the GSOC.
In short: I can’t recommend it. The G90 is a much better radio without the GSOC controller, in my opinion.
Do you own the G90?
Have you even owned or operated the Xiegu G90? What do you consider to be its pros and cons? Please comment!
Some of my most enjoyable field activations are those involving the least amount of equipment and accessories. Maybe it’s my “less is more” mentality, but it is amazing when all I need to get on the air is one radio, a feedline, logging notebook, and a simple antenna.
That was my set-up earlier this week (February 8, 2021) when I activated Kerr Scott State Game Land–a site I hadn’t visited since last summer.
Kerr Scott State Game Land (K-6918)
I was the first person to activate Kerr Scott State Game Land back in June of 2020.
I vividly remember that activation because, as I noted in my field report on the SWLing Post, it was Kerr Scott that taught me an invaluable lesson:
“[I]f you don’t have a “spot” of your activation on the POTA site, it’s like you don’t exist.”
This was truly a tipping point that lead me down the path of doing CW activations in order to benefit from auto-spotting via the Reverse Beacon Network (RBN). Only a couple weeks after this activation, I made my first CW activation and the rest is history. While I still use SSB during activations, CW has become my favorite mode even though I’m still not that great of an operator.
I speak about this a bit more in my activation video below.
Once I arrived on site, I deployed my EFT Trail-Friendly 40/20/10 meter end-fed resonant antenna.
The last few times I deployed this antenna in the field, it hasn’t been resonant on 40 meters and I suspect this is due to damage to the coil near the end of the radiator. I decided I’d give it one last test by suspending it in an overhanging tree branch about 50 feet high so it would not touch other branches.
When I turned on the KX2, I set the internal ATU to “bypass” and tested SWR. Sadly, it was unacceptable, so I re-activated the ATU to get a good match.
My buddy and fellow POTA activator, Steve (KC5F), reminded me recently that the radiator on this antenna can be replaced with enough wire to make a simple end fed half wave. That’s probably what I’ll do because, frankly, this antenna has served me so well for five years and over 150 park activations I’m not ready to simply toss it. I will need to order some proper wire for the EFHW, though!
On The Air
Since I have no mobile phone/Internet service at this site, I decided to make this a CW only activation, hopefully taking full advantage of auto-spotting to the POTA spots page.
I started on 40 meters because I had pre-arranged with my buddies Mike (K8RAT) and Eric (WD8RIF) to listen for me on 7063 kHz. I did this in case auto-spotting wasn’t working, which does happen from time-to-time. It’s always important to have a back-up if possible especially for sites (like this one) that carry significant travel time.
I hopped on 40 meters, called CQ POTA and within 29 minutes, I logged 26 stations. That’s about as much activity as I could possibly expect during a Monday morning activation!
Next, I moved to 20 meters and started calling CQ. The first station I worked was CU3BL in the Azores, then WD5GRW in Texas, AB6QM in California, then IK4IDF in Italy, and finally KH2TJ in California.
I then moved to 30 meters and worked N5GW in Mississippi before going QRT with a total of 32 stations logged.
Not at all bad using 5-10 watts!
Here’s a QSOmap of this activation (click to enlarge):
Activation Video
I made a real-time, real-life, no edit, no advertisements video of this activation. Feel free to check it out if you like:
One of the things I rarely mention in my videos and field reports is how much I love the trips to/from an activation site. I’m a traveler at heart and while I’ve been fortunate enough to travel to and live in some pretty amazing countries and cities, I still have a deep appreciation for simply driving through the countryside and taking in the scenery. I appreciate the mundane as much as I do the majestic. It’s a beautiful drive.
Kerr Scott Game Land is located in the little farming community of Boomer, NC which, I understand, was named after its first postmaster, Ed “Boomer” Matheson.
Warrior Creek, next to my activation site at Kerr Scott
Before it was called Boomer, the community was known as Warrior Creek–the very creek running through Kerr Scott Game Land.
Even though I know there’s no connection, when I hear the name Boomer I can’t help but think of the incredibly cute and cheeky red squirrel that we WNC natives call “Boomers.”
Ham Radio Forms a Planet-Sized Space Weather Sensor Network
For researchers who monitor the effects of solar activity on Earth’s atmosphere, telecommunications, and electrical utilities, amateur radio signals a golden age of crowdsourced science.
Space weather events, triggered by solar emissions and their interactions with Earth’s atmosphere, can have significant effects on communications and navigation technology and on electric power systems. As with terrestrial weather events, the economic impacts of space weather–related disruptions can be substantial, affecting satellite systems as well as systems on the ground. A severe geomagnetic storm (on the order of the Carrington Event of 1859) could have a catastrophic effect on modern infrastructure. Even solar storms of more ordinary size can induce currents in the power grid that drive up energy prices, affecting manufacturing and commerce.
Considerable interest exists in developing space weather forecasting technologies that use Earth’s ionosphere as a sensor for events in its neighboring atmospheric layers. The ionosphere occupies a privileged niche in the geospace system, as it is coupled into both the terrestrial weather of the neutral atmosphere below and the space weather of the magnetosphere above.
Although we have a good understanding of ionospheric climate—diurnal and seasonal variations are well known, as are the rhythms of the sunspot cycle—there are new and vital areas of research to be explored. For example, it is known that the ionosphere—and near-Earth space—experiences variability (e.g., radio signals can fade in and out over periods of seconds, minutes, or hours due to changes in ionospheric electron densities along signal propagation paths), but this variability has not been sampled or studied adequately on regional and global scales.
[…]The Ham Radio Science Citizen Investigation (HamSCI) is a collective that unites amateur radio operators with the research community in the space and atmospheric sciences. This confederation of scientists, engineers, and hobbyists holds annual workshops during which ham radio operators and space scientists share findings. A new HamSCI effort, the Personal Space Weather Station project, aims to develop a robust and scalable network of amateur stations that will allow amateurs to collect useful data for space science researchers. The next HamSCI workshop will be held virtually 19–21 March 2021, and it will focus on midlatitude ionospheric measurements.
A Ready-Made Volunteer Science Community
From a communications point of view, the electromagnetic spectrum is a finite resource. Signals from broadcasting, telecommunications, and navigation all have their own demands of bandwidth and range. Spectrum allocations are managed by government agencies, such as the Federal Communications Commission (FCC) in the United States. Most countries allot some of the available spectrum to amateur users for the purposes of recreation, experimentation, and the promotion of international goodwill. There are more than 760,000 licensed amateur radio operators and uncounted shortwave listeners in the United States alone.[…]
Many thanks to Don (W7SSB) who shares the following video produced by Josh at Ham Radio Crash Course.
In this video, Josh tours the Chameleon Antenna manufacturing facility and gives viewers a close-up view of how their gear is built.
If you’re not familiar, Chameleon Antenna is a specialist antenna manufacturer that makes military-grade, field portable antennas that are low-profile and stealthy. Chameleon products are 100% made in the USA and their customers range from amateur radio operators to the armed forces.
I’m also honored that Chameleon Antennas sponsors QRPer because they love promoting field radio operating. They’ve sent me a number of their antennas to give a thorough evaluation in the field and I’ve been very pleased with their ease of deployment and overall quality.
To be clear, their antennas are not cheap, but they are a prime example when we talk about “you pay for what you get.” In all of my years of evaluating radio products, I’ve never seen better quality field antennas–they’re absolutely top-shelf.
You’ll see in this video how focused the company on producing quality products.
Last week, I had a hankering to visit a site I hadn’t activated in a few months: South Mountains Game Land.
This game land is pretty vast and has a number of entry points, almost all of which are very accessible. When I re-visit a site multiple times, I like to try different entrances when I can because it gives me a chance to check out a site better and, frankly, even enjoy a little light off-roading.
I found a western road leading deep into South Mountains from the Wildlife Resource Commission map and decided to explore it and do a quick activation.
South Mountains Game Land (K-6952)
I avoid activating Game Lands on days when I suspect there will be a lot of hunting. Tuesday afternoon was *not* ideal for hunters. Besides being the middle of a work day, it was cold and very gusty.
As I drove about 4 miles into the site, I didn’t see a single car or truck parked in any of the parking areas. I could tell I had the place to myself.
A Few Precautions
It goes without saying that if you’re doing a POTA or SOTA activation in a rural/remote area that has no mobile phone coverage (quite common at the ones I activate), you really need to take a few precautions.
First of all, let someone else know where you’ll be and how long you plan to be there. I always let a couple radio friends know where I’ll be so if I don’t show up on the air or they don’t hear from me, they could contact authorities to look for me.
Secondly, always take a proper first aid kit. If you get hurt, you need a way to apply first aid until you can get help.
Take a handheld radio with local repeater frequencies pre-loaded. Even though I might not have cell phone coverage, I can almost always hit at least one repeater.
Of course, carry a little food and water with you and make sure your vehicle has fuel as well.
Always wear a high-visibility vest, jacket, and/or cap. Many game lands require these. Besides, would you rather perform and activation or get shot? I don’t like getting shot. I also don’t like the idea of being bear food, so at least pack a little bear mace if you’re in bear country.
When I’m activating a game land I don’t hike deep into the woods. In fact, I try to stay on or very close to a parking area. Even though POTA is becoming a very popular radio activity, I can promise that you’ll likely be the first POTA activator most hunters will see. It’s a good idea to be near areas of activity like a parking spot or road where they’re much less likely to be hunting.
Finally, as I mentioned before, I personally do not activate game lands on busy hunting days.
Of course, check the weather forecast in advance.
On The Air
I found a great spot to set up my station near a ridge line deep in the game lands.
Normally, I’d set up right next to my car, but Tuesday the winds were very gusty so I found a semi-protected area maybe 10 yards off the road. I located a spot with the least amount of overhanging branches (always check for widowmakers and dead trees!).
It only took me five minutes to deploy the Chameleon Emcomm III Portable random wire antenna with my arborist throw line.
Random wire antennas require tuners, so I employed the Mat-Tuner mAT-705 Plus.
This site has no mobile phone coverage, so I had no easy way to spot myself to the POTA spots page had I decided to do a little phone/SSB operating. I decided to stick with CW as the POTA spots page will auto-spot me using my information from the Reverse Beacon Network (as long as that system is working).
It’s so rare that I do activations around noon or early in the afternoon, so I decided to start on 20 meters just to see if I could snag a European station.
I felt pretty chuffed to quickly snag the Azores (CU3BL) and a few west coast stations with my 5 watts and a wire. QRP rocks!
I then moved to 40 meters where I worked a number of stations in succession and topped off the activation with one 30 meter contact.
Here’s a QSOmap of this activation:
Not bad for about 40 minutes on the air.
Video
I also made one of my real-time, real-life videos of the activation. Note that my camera died on me perhaps five minutes before I completed the activation, so it will end abruptly. Sorry about that!
My ankle is healing nicely so I’m feeling more comfortable with the idea of hiking again. I’m plotting a SOTA activation with my daughter in the coming weeks.
Also you can get from a camping store a POTA party shelter for about $50 .
Great for a cheap portable ham shack . Keeps out of the sun and weather .
Room for a table, chair and cooler. What more do you need?
Have fun !
Don W7SSB
Thanks so much for the tip, Don!
It’s ironic you send this now as I’ve been looking at an inexpensive pop-up shade tent to protect my radios from the snow, sun and sand when doing portable operations. This $12 model(Amazon affiliate link) has been in my Amazon cart for about a week:
It’s made to protect a sun-bather’s head from the sun or protect a small pet. I think my gear could easily fit inside on a tabletop or ground and there’s even a small ceiling window (designed so people can look at their phones while sun bathing?!?) that I think would work brilliantly as a spot to place an LED light to illuminate the inside of the tent.
While I don’t think I’d use this a lot, it would be awfully handy when there’s no shelter from direct sunlight. It should keep a radio from over heating.
Also, recently I was operating outdoors with blowing snow–temps were well below freezing, but when snow landed on the transceiver, the chassis was warm enough to melt it. It started to get downright wet on top. A small pop-up like this would have come in handy.
Readers: Do you use pop-up shade products? Feel free to comment with your experience and share models you’ve used.
This Saturday (Jan 30, 2021), I had a small window of opportunity to perform a Parks On The Air (POTA) activation. My park options were limited because I needed to stay near my home and a store where I was scheduled to do a curbside pickup.
The only viable option–since time was a factor–was my reliable quick hit park.
The Blue Ridge Parkway (K-3378)
I plotted a quick trip to the Blue Ridge Parkway Folk Art Center which is centrally-located and, this time of year, there are few visitors.
But what radio take? It had been a couple of weeks since I used the IC-705 in the field, so I decided to take it and rely only on its supplied BP-272 battery pack.
My buddy Mike (K8RAT) had warned me only a few minutes before my departure that propagation was pretty much in the dumps. I’d also read numerous posts from QRPers trying to participate in the Winter Field Day event and finding conditions quite challenging.
Saturday was the sort of day that I should’ve deployed a resonant wire antenna and made the most of my meager five watts thus collect my required 10 contacts in short order.
And that’s exactly what I didn’tdo.
You see, a really bad idea popped into my head that morning: I had a hankering to pair the IC-705 with my Elecraft AX1 super compact vertical antenna.
This made absolutely no sense.
I tried to get the idea out of my head, but the idea won. I suppose, at the end of the day, I’m not about taking the easy path (and I’m obviously a glutton for punishment).
I was also very curious if the mAT-705 Plus external ATU could tune the AX1 on 40 meters. More on that later…
I arrived on site a few minutes before noon. Setup was fast–that’s the big positive about using the AX1.
Normally, I deploy the AX1 antenna with my KX2 or KX3 and simply attach it to the BNC connector on the side of the transceiver. The AX1 Bipod gives the antenna acceptable stability during operation.
The IC-705 also has a side-mounted BNC connector, but it’s much higher than that of the KX3 or KX2. I’m not entirely sure I could manipulate the Bipod legs to support the antenna without modification.
That and the AX1 needs an ATU to match 40 meters (where I planned to spend most of the activation). Since the IC-705 doesn’t have an internal ATU, mounting it to the side of the transceiver really wasn’t an option.
I employed my AX1 tripod mount for the first time. On the way out the door, I grabbed an old (heavy) tripod my father-in-law gave me some time ago and knew it would easily accommodate the super lightweight AX1.
On The Air
I first tried using the Mat-Tuner mAT-705 Plus ATU to tune the AX1 on 40 meters.
No go.
I tried both the phone and CW portions of the 40 meter band, but the mAT-705 Plus simply couldn’t find a match. SWR was north of 7:1 – 9:1.
Instead of grabbing the Chameleon MPAS Lite or 2.0 from the car, I decided instead to see if the Elecraft T1 ATU could tune 40 meters.
It did.
In short, I logged my ten contacts to have a valid activation, but it was slow-going. All but two of my contacts were on 40 meters CW. The last two logged were on 20 meters CW.
It was a challenge, but I really enjoyed it! And, frankly, considering the propagation, 5 watts of power only using the IC-705 battery pack, and the inherent inefficiencies using a loaded compact vertical antenna and ATU? I was impressed.
Here’s a QSOmap of my 10 contacts:
I bet my effective radiated power was closer to 2-3 watts.
Typically, the AX1 antenna acts almost like an NVIS antenna on 40 meters, but Saturday it favored Mid-Atlantic and the states of IN, OH, and PA. Normally, I would expect more of a showing from the states surrounding North Carolina.
My last two contacts on 20 meters were with KE5XV in Texas and KB0VXN in Minnesota. Not a bad hop!
It took longer to collect my ten contacts than I had hoped and I ran nearly 25 minutes late to my curbside appointment. I’m a punctual guy, but there was no way I was leaving without my ten! 🙂
Here’s a video of the entire activation. Hint: it’s the perfect remedy for insomnia:
Next time I try to pair the IC-705 with the AX1 antenna, I think I’ll try adding a couple more ground radials and see if the mAT-705 Plus can more easily find a match.
One thing I know for sure: the T1 is a brilliant little ATU. While the mAT-705 Plus was never designed to do this sort of match, it’s comforting to know the T1 can.
I’m very curious if anyone else has paired the Elecraft AX1 with the Icom IC-705 or other QRP transceivers. If so, what was your experience? Please comment!
I’ve received no less than three inquiries this weekend from readers who are seeking advice about purchasing a portable external ATU to pair with their Icom IC-705 transceiver.
Fortunately, there are few options on the market and I believe there is no “right” one because choices are really based on operator preferences.
I’ll do my best to sum up my thoughts below based on the three ATUs I regularly employ and what we know so far about the AH-705 ATU from Icom.
Keep in mind this list will not include some excellent options from LDG, MFJ, and other companies simply because I haven’t used them in the field. Please feel free to add your comments if you have experience with other good options.
Mat-Tuner mAT-705 Plus
The Mat-Tuner mAT-705 Plus is the first external ATU on the market that directly pairs with the Icom IC-705 via a control cable.
The latest iteration–the mAT-705 Plus–is the ATU I can recommend.
Be careful if purchasing an mAT-705 used as you’ll want to make sure you’re getting the Plus version. The Plus version has a USB-C charging port on the front panel (seen in the photo above)–the original mAT-705 does not (it uses replaceable 9V cells).
Pros:
Perfectly pairs with the IC-705 for full CAT control
Wide tuning range
Tuning is fast and relatively quiet
Numerous memories making repeat matching rapid
Internal rechargeable battery
Rugged chassis
Cons:
Cannot be paired with other radios without modification (not recommended by the manufacturer)
At $220 US, it’s not the cheapest option
Because the IC-705 relies on CAT control for operation, if you leave the control cable at home or on a park bench, you will not be able to operate the ATU. (Pro)Fortunately, the CAT cable is a simple 3 conductor 1/8″ stereo patch cable.
Summary: If you’re looking for an ATU to take full advantage of IC-705 CAT control, the mAT-705 Plus is a great option. The only significant disadvantage of this ATU is the fact that it only pairs with the IC-705 (or possibly other Icom transceivers with similar CAT control). In other words, you can’t pair it with other QRP transceivers you might own.
The Elecraft T1 has been on the market for at least 16 years and is one of the most popular portable antenna tuners on the market.
Elecraft offers the T1 in kit form ($159.95) and factory assembled/tested ($189.95).
The Elecraft T1 has a CAT control port that has been used with the FT-817 in the past. Elecraft recently announced that they will also produce an IC-705 CAT cable that will allow full pairing with the IC-705 transceiver (much like the mAT-705 Plus above).
To be clear, though, the T1 doesn’t need a control cable to function: simply press the TUNEe button for one second, then key your transceiver.
Pros:
Very wide tuning range
Soon it will have an IC-705 CAT connection cable option
Uses common 9V battery that is easy to replace in the field. (Con) Not internally-rechargeable like the mAT-705 Plus.
One of the most compact automatic ATUs on the market
Pairs with any 0.5-W to 20-W transceiver covering the 160-6 meter bands
FT-817 Remote-Control Option
Cons:
Front panel buttons need protection while in your pack to prevent accidental pressing that will deplete the battery. I 3D-printed this simple cover that works brilliantly.
Not weather-proof
Summary: The Elecraft T1 is my personal favorite. Since the T1 pairs with any QRP transceiver, I love the flexibility. The T1 has also been on the market for ages and is a solid, safe choice–we know longevity is benchmark. I’ve never been in a situation where the T1 couldn’t find a reasonable match.
I will certainly test the new IC-705 control cable option when it is released in the near future–stay tuned.
The AH-705 is Icom’s custom ATU designed to perfectly pair with the Icom IC-705 via control cable. If you want an all-Icom setup, this is it.
Pricing in US dollars is TBD at time of posting, but the announced retail price is $350 .
Pros:
Perfectly pairs with the IC-705
Wide tuning range
2-way power sources using alkaline batteries (2 x AA cells) or external 13.8 V DC
IP54 dust-protection and water resistance construction
Could (potentially–?) be permanently mounted outdoors at the antenna feed point as a dedicated remote tuner
Cons:
In terms of overall size, the AH-705 appears to be the largest of the portable ATUs mentioned here
It doesn’t appear AA batteries can be recharged internally
The AH-705 may (we don’t know yet) only work with the IC-705 and possibly similar Icom models
The maximum power handling of the AH-705 is 10 watts–if you use other transceivers (if that is even possible) you would have to be extremely careful with power settings.
The AH-705 is pricey if the actual retail price ends up being near the projected $350 mark. Hopefully, it’ll be much less than this.
Like the mAT-705 Plus, the AH-705 will require a control cable for operation. (Pro) Of course this means it pairs perfectly with the IC-705 and can follow frequency changes without RF sensing.
Summary: Keep in mind, I have not tested the AH-705 yet, so this is only based on announced specifications.
The strongest selling point for the AH-705? Since the AH-705 is designed to be dust and weather resistant, it could be mounted at the antenna feed point. At home, perhaps it could act like an externally-mounted, remotely-controlled antenna tuner. I’m not sure what the maximum length of the control cable could be, but Icom Japan even lists a 16 foot control cable as an accessory. Of course, you would still need to follow Icom’s guidance about protecting the antenna, transmitter and control cable connection points.
The biggest negative to me is the size. Just check out how large it is compared to the IC-705 in this video. It’s still very portable, but the other ATU options above are much smaller.
Still: if the AH-705 is great at matching antennas and the price ends up falling below the $300 point, I’m sure it’ll be a very popular ATU.
Another option often overlooked are portable manual antenna tuners. I’m a big fan of the Emtech ZM-2 which is offered both in kit ($62.50) and factory assembled/tested form ($87.50).
It is a manual tuner, so requires manual input to find a match. While it’s not as easy as push-button tuning, it isn’t complicated either.
Here’s my routine:
I set the top right switch to “GROUND” if using coax feed line and “LINK” if using a balanced line.
Set the added capacitance switch “ADD” to “0”
Set the TUNE/OPERATE switch to OPERATE
I set both capacitors to middle positions (6 on the scale)
Tune to AM or SSB and listen to the noise floor as I tune the variable capacitors to maximize the noise level. I typically start with the left capacitor, maximize it, then maximize the right capacitor
If the antenna is particularly challenging, I might add 250 or 500PF via the ADD switch
Set the TUNE/OPERATE switch to TUNE
In CW mode, I key down and make fine tuning adjustments with the variable capacitors to make the red tuning LED turn off (high SWR makes the red LED illuminate)
Set the TUNE/OPERATE switch to OPERATE and hop on the air! (Often, I’ll double-check the SWR on my transceiver).
This sounds complicated, but once you’ve done it even two or three times, it becomes routine. I’ve yet to find a wire antenna the ZM-2 can’t match–it’s a very capable tuner.
Pros:
The most affordable option listed here
Very wide matching range
Portable and very lightweight
Requires no batteries for operation
Mechanically simple
Reliable
Cons:
Although not complicated, there is a small learning curve involved
Each time you change bands, you will need to manually re-tune the ZM-2
Not as fast and hassle-free as an automatic ATU
Not weather-proof
Summary: I carry the ZM-2 with me even if I plan to use an automatic portable antenna tuner. If my auto ATU loses power for some reason, the ZM-2 will always rescue me. Plus, it’s just as capable of making tough matches as the ATUs above.
I also love using the ZM-2 to match antennas for shortwave broadcast listening outside the ham bands.
Even if you buy an automatic ATU, I would still encourage you to buy a ZM-2 as a backup. It’s affordable, reliable, and very handy.
As I mentioned above, these choices are just a small selection of what’s actually available on the market. Please share your favorite portable ATUs and experience by leaving a comment!
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For the past four days here at my mountain QTH in North Carolina, I haven’t seen the sun. The cloud ceiling has been low and our house has been in the middle of it. It’s been rainy and foggy with temps floating a few degrees above freezing.
Since the Elecraft KX2 has a built-in battery and built-in ATU, I basically connected the radio directly to the antenna and was on the air in moments.
I look back at activations like this and am reminded of the magic of HF radio. It’s truly phenomenal, in my mind, that with less power than it takes to light an LED bulb, I can make contacts across the continent pretty effortlessly–CW or SSB–even during the solar doldrums! Good fun!
