Long time QRPer.com contributor and supporter, Jonathan (KM4CFT) has designed and started producing ultra-compact end-fed antenna kits (eBay affiliate link).
His end-fed antennas are incredibly small, thus perfect for portable operations. They remind me very much of K6ARK’s end-fed wire antenna kits, but a little easier to build because the board is larger and there are no surface mount components.
Jonathan sent me one of his end-fed kits (assembled) a couple weeks ago, but I’ve yet to trim mine due to my crazy schedule and activities as of late (well, that I need need to order more wire!). I will take this antenna to the field this month, but the video may not show up for a few weeks.
W2AEW Builds the KM4CFT UNUN
This morning, I learned that my good friend Alan (W2AEW) published a video where he builds, tunes and tests Jonathan’s QRP End Fed UNUN kit:
Alan’s video is superb. If you purchase this EFHW kit, I’d encourage you to watch his build. (And subscribe to his channel!)
How to purchase
Jonathan is selling his antenna kits on eBay–click here to check it out. The price is $29.95 plus a modest shipping fee. I think it’s an excellent deal.
Of course, you’ll need some wire for your radiator and/or counterpoise.
I plan to build mine with a 30 meter link to pair with my Mountain Topper MTR-5B.
Yesterday, I posted some initial notes about the Elecraft KH1 and mentioned that I hoped to perform a POTA activation later in the day.
I’m pleased to report that I was able to fit in that activation!
I’m pushing this report and video to the front of the line because so many readers are eager to see how the KH1 performs during a field activation. Instead of focusing on the park, in this field report we’ll be taking a closer look at the KH1 and my initial impressions after performing a pedestrian mobile POTA activation with it.
Packing the KH1
I had a very hectic schedule yesterday and was on the road in/around Asheville from 8:00AM to 2:00PM before an opportunity opened to fit in an activation.
After a quick trip back to the QTH for lunch, I packed the Elecraft KH1 field kit in my EDC pack (a travel laptop bag).
Herein lies my first impression of the KH1: even though I knew I had packed the entire kit, I felt like I must have been leaving something behind.
Sounds funny, but even though I pride myself on making fully self-contained field radio kits, I felt like there must have be something else I needed. The KH1 field kit just seemed too small, too lightweight, and too compact to have included everything I needed for an activation.
Intellectually, I knew that it included everything needed, but I still did a mental inventory:
Radio? Check.
Antenna? Check.
ATU? Check.
Paddles? Check.
Battery? Check.
Counterpoise? Check.
Log book and pencil? Check.
Hard to believe, but it was all there.
Trust me: the first time you take your KH1 to the field, I bet you’ll feel the same way I did.
Blue Ridge Parkway (K-3378)
Because I was so short on time, I decided to activate the Blue Ridge Parkway which is the most convenient POTA entity when I travel into Asheville from Swannanoa.
It was cold and blustery afternoon the afternoon of November 1, 2023. At my QTH, I checked the temperature and it was about 34F. I knew it would be a bit warmer in town which is a good 1,000 feet lower in elevation, but I still grabbed my gloves on the way out the door. Glad I did!
As I mention in the activation video below, I wasn’t exactly on my “A Game.” I had received a couple of vaccines the previous day and my body was a bit achy as if I was starting to get the flu. But, of course, I wasn’t. Still… I didn’t feel 100%.
I arrived on site and set up couldn’t have been easier:
Open the KH1 pack
Remove the KH1
Attach the counterpoise and string out on ground
Remove whip from clips and attach to top of KH1
Extend whip
Turn on radio
Find a clear frequency
Hit the ATU button for a 1:1 match!
We’re talking a 30 second process even for someone who moves slowly.
Important notes about my KH1
Keep in mind the following notes that are relevant at time of posting this field report (November 2, 2023):
I am waiting on a firmware update to add:
CW Message Memories
CW Decoding
Internal Logging
I purchased the full “Edgewood” package but I don’t yet have my logging tray/cover yet. Elecraft plans to ship this within the next few days.
My KH1 is a very early serial number because I’m in the volunteer testing group.
The KH1 Speaker
The KH1 internal speaker is located on the bottom of the radio between the AF Gain and Encoder knobs.
I consider the Elecraft KH1 speaker to be a “bonus” feature. The speaker is small (1.1 x 0.65”) and limited in fidelity.
I walked out of my front door on the morning of Friday, September 29, 2023, knowing I was going to do an activation, but I had no idea where that might be.
I certainly had no idea it would be one of my most memorable activations ever–!
I knew I had a five hour window to play radio somewhere not too far from my daughters’ classes near the Asheville Airport.
I really wanted to do a SOTA (Summits On The Air) activation, but I’d pulled a muscle in my back and was nursing it a bit. I knew that an invigorating hike on a long, gnarly trail was not really in the books.
After dropping off my daughters, I sat in the parking lot running through the activation options in my head. There were 5 or so parks within an easy drive. I knew a POTA activation probably made the most sense since it wouldn’t require hiking or carrying a heavy pack.
Then again, I really wanted to do a SOTA activation–the weather was so amazing, I didn’t want to miss out on an opportunity to take in a summit.
I decided that if I took a minimal amount of gear and activated an “easy” summit, then maybe I could get away with a little SOTA without hurting my back. I thought this might be the perfect excuse to do a SOTA activation pairing my Elecraft KX2 and AX2 antenna. I had a lightweight chair and my kneeboard, so in theory, I could set up anywhere on the summit with my entire station on my knee.
Next, I only needed to find the right summit and one came to mind almost immediately…
Black Balsam Knob (W4C/CM-005)
The last time I activated Black Balsam was with my buddy, Monty, in 2021. I remembered that it was an easy hike with stunning vistas of Pisgah Forest (K-4510) and the Blue Ridge Parkway (K-3378).
This it the Mountain Ash (Sorbus Americana) with bright red fruit!
I drove 55 minutes to the trailhead and was happy that there weren’t too many cars in the parking area yet that morning. Black Balsam is one of the most popular summits on the Blue Ridge Parkway, so sometimes it can be a challenge to find a parking space…especially with stunning weather like this!
The hike was very pleasant and my GoRuck GR1 backpack was pretty light.
I knew I’d chosen the right summit hike.
The views from the Art Loeb Trail do not disappoint. (Click images to enlarge.)
In fact, if anything, I wish this hike were just a little longer because I enjoyed the scenery so much!
It’s only 3/4 of a mile one way, so it goes by quickly. Still… it’s why I chose this particular summit. I knew it would be gentle on my back (and it was).
Once I reached the summit, I started searching for a spot to set up. There were quite a lot of folks on the summit that morning, so I looked for a site just slightly off of the main trail.
I was speaking with my buddy Joshua (N5FY) in mid September. He’d recently acquired an Elecraft KX1 and the topic came up about pairing the KX1 with the AX1 antenna. I realized that in all of my experimenting with the AX1, I’d never paired those two. What!?!
Time to fix that!
On Thursday, September 28, 2023, I had a nice midday window to play radio. After dropping my daughters off at their classes, I stopped by the French Broad Food Co-op and grabbed a container of their chicken noodle soup from the refrigerator section.
I then made my way up the Blue Ridge Parkway (K-3378) to the Craggy Gardens Picnic Area at Bearpin Gap–one of my favorite spots on the BRP.
Despite stunning weather and the beginnings of fall foliage, the parking lot was pretty empty. After all, it was a Thursday and a good week or two before leaf-lookers descend upon western North Carolina.
I pretty much had the picnic area to myself (there was one other person there). I picked a picnic table at the top of the hill under the trees.
Mahlzeit!
When my wife and I lived and worked in Munich, the salutation I learned before any other was “Mahlzeit!” At Siemens, I remember walking through the hallways and people I’d never met before exclaimed “Mahlzeit!” as I passed by.
I quickly learned that Mahlzeit essentially meant “Lunch Time!” and I still say it today to my family when I’m about to make or grab some lunch. Funny how these things stick with you.
Now where was I–? Oh yes…
First thing I did at Craggy was set up my stove to start heating the soup. I show this in my activation video below.
If interested, here are the components of my stove kit:
Next, it dawned on me that I would need to attach the AX1 counterpoise to the KX1. I didn’t bring one of my copper clamps to attach to the outside of the AX1’s BNC connector, so I needed to find another grounding point on the KX1.
I then remembered that the KX1 has two thumb screws on the bottom of the radio. Knowing Elecraft, I assumed that these screws could be used as an attachment point for a counterpoise, but I wanted to confirm that the screw itself had a direct connection to ground.
Fortunately, I keep a small multimeter in my supplemental gear bag in my car. It’s an inexpensive Allosun Pocket Multimeter. I use it for things like this: testing.
I set the multimeter to read continuity and then placed one probe on the outside of the KX1’s female BNC and the other on one of the thumb screws. Sure enough, there was a direct connection to ground. I didn’t need to worry about the KX1 chassis paint insulating the connection to ground because the thumb screw had a direct connection. Perfect! Continue reading Amazing POTA Fun: Pairing the Elecraft KX1 and AX1…but first, a little lunch!→
Lately, I’ve been kitting out another fully self-contained field radio kit that would be small enough to fit in my EDC (everyday carry) laptop bag–something super compact.
I’ve been getting some great ideas from those of you who have added your kits to the Field Radio Kit Gallery.
[By the way, if you’ve submitted your kit to the gallery and haven’t seen it yet, note that I’m posting these in the order received and there are many in the pipeline!]
I’ll likely build my EDC field kit around the Elecraft KX1 or the Mountain Topper MTR-3B, then pair it with a good wire antenna.
My EDC laptop bag: the Tom Bihn Stowaway
But this process got me thinking: if money was no object, and I wanted the most compact and versatile multi-band field kit, what radio and antenna system would I choose?
My answer? A kit built around the Elecraft KX2 and AX1 antenna.
In my experience, the KX2 AX1 combo is hard to beat. It’s compact, effective, low-profile, and you can set it up pretty much anywhere.
Let’s explore my reasoning here keeping in mind–in my world–this is a very deep rabbit hole to go down. I’ll do my best–no promises–to keep this as concise as possible:
Compact, Low-Profile, Self-Supporting, and Simple
Here are all of the components of my typical KX2 AX1 field kit:
This is all that is needed for a field activation.
And if you’re an SSB operator? You don’t really need a microphone because one is built into the KX2 (that said, I’d suggest you build a compact mic if you plan to do a lot of SSB operating).
If I wanted to make this kit even a bit more versatile? I’d add a kneeboard to the list. This gives one the ability to operate without a picnic table.
What makes this field kit so portable is that the KX2 is one of the most compact general coverage HF transceivers on the market.
It’s certainly the most compact (at time of posting) when you realize that two important components–the battery and ATU–are internal options.
The AX1 antenna is also incredibly compact–it comes apart in such a way that no one component is longer than about 6 inches. What you see in the photo above is the entire radio and antenna system.
Yes: A Compromise
Sure–and let’s get this out of the way right up-front–the AX1 is a compromised antenna, and being a massive fan of simple wire antennas myself, I know a properly deployed wire in a tree is going to provide better gain each and every time.
I enjoy shaking up routine and since POTA and SOTA activations are my routine, they end up being the shakers.
On Monday, September 18, 2023, I found out that our planet was rotating into a large CME (Coronal Mass Ejection). This CME made all of the space weather news and we planned for either some potential radio blackouts or at least very unstable conditions.
As I’ve said many times before, I never let the potential for poor propagation stop me from hitting the field. Don’t let it stop you either.
Lake Norman State Park (K-2740)
I had a full afternoon to play radio, so I made my way to Lake Norman State Park.
En route, I tried to think of a way to shake up the activation a bit. I planned to activate at the same spot I had during my last visit because I knew the park’s main trail system was still closed and, frankly, I wanted to take advantage of the EV charger at the visitor’s center again!
I’d packed MW0SAW’s End-Fed Half-Wave (the gift that keeps on giving, Steve) and I did have one new radio toy (more on that later).
I also had a lot of time–at least, more than I normally do during a POTA activation–so I thought it might be fun taking my KX2 down to the lowest power setting it has: 100 milliwatts.
I’ve activated parks with 100mw before, but never intentionally on a day when I knew propagation would be poor.
I figured with enough time, maybe I would get the ten contacts needed for a valid POTA activation.
If not, it would be fun trying!
Why Milliwatting?
At the end of the day, I think taking our radios and antennas to their low-power extremes gives us a taste of what we can actually do with so little signal.
I remember shortly after I bought my first Elecraft KX1 in 2008, I was speaking with a local ham and he told me that a maximum output of three watts was pretty useless and that I really needed a minimum of five watts if I expected to make any contacts.
Part of me did feel like perhaps I’d bought something more akin to a toy–fun to look at and hold, but not terribly practical.
Then I started using that KX1 to make contacts and even carry on extended rag chews. Turns out, three watts gets a lot done!
Today, I’ll often run my MTR-3B with three watts or even less when activating a summit and the results are simply outstanding–fabulous DX and contacts galore.
I know 100mw is a proper compromise, but I like knowing what I can achieve with so little. Tinkering with it in the field and listening to signal reports (also reading RBN stats) gives me a good idea.
In an emergency situation? If I could only push 100mw into a decent antenna, I know it wouldn’t be ideal, but I know it wouldn’t be futile either.
On Friday, September 15, 2023, my wife and I had a few hours midday to enjoy the gorgeous pre-fall weather, so we decided to go on a hike with Hazel.
My wife was the one that suggested I pick out a hike that would open the door to a short POTA activation (isn’t she the best–?).
Carl Sandburg National Historic Site (K-0804)
Earlier that week, I made a note to activate the Carl Sandburg National Historic Site in the village of Flat Rock, North Carolina. I passed this idea by my wife and she agreed that it’d make for a perfect outing.
The mission of the Carl Sandburg National Historic Site is to preserve Connemara, the home of Pulitzer Prize-winning poet and writer Carl Sandburg.
The park has a wonderful trail network and I hadn’t visited it since 2016, during the National Parks On The Air (NPOTA) ARRL event.
Technically, I could go back into my NPOTA logs and upload my Sandburg activations to the POTA site because previous activations do count, but I’m not actually motivated by my park count so much as I am just having fun working new-to-me sites under the new POTA program.
That said, my somewhat flexible, non-committal goal of having at least 100 unique parks activated for POTA before the end of 2023 was also on my mind; a small motivator to expand my POTA footprint.
Admittedly, there really aren’t many parks that are within two hours of my QTH that I haven’t already activated for POTA. The ones left, like Sandburg, are just outside the corridors I normally travel.
The Sandburg site is a beautiful one, and I think Hazel may have even remembered this spot from so many years ago. My wife and I got a kick out of how giddy she was to hit the trails, smell the smells, and meet all of the other hikers.
Hazel: “Enough talking, Dad! More hiking!”
Time to hit the trails and find an activation spot!
Knee Board Portable!
Back in 2016, I got permission from a Sandburg park ranger to place a wire in a tree in order to perform my NPOTA activation. She only asked that I perform my activation on the trail network (not at the house and goat farm).
Wow…I just checked and I had forgotten that I made a short field report of that activation over on (my other blog) the SWLing Post—check it out here. Back then, my KX2 was still very new and shiny!
Not even a scratch on the KX2 back then! Today, Hedy looks a little more field battered! 🙂
And here we are seven years later and I’m still activating the Carl Sandburg site from my lap. This time, however, I don’t have my radio on a clip board, I’m using a folding knee board:
This is my Tufteln/N0RNM folding knee board and you’ve seen me use it in numerous activation videos.
Instead of just placing my logs and radio on the knee board, like I did back in 2016, I wanted to place my entire antenna system on it, too.
You see, although I’m sure the staff at the Sandburg home wouldn’t mind me putting a wire in their trees along the hiking trail, I couldn’t find a staff member to ask, so I used this as an excuse to try something I’ve always wanted to do: mount my AX1 on the knee board as well!
I’m very fortunate in that in the past few years I’ve accumulated a number of QRP radios that I use in rotation when I do park and summit activations.
I’m often asked for advice on choosing radios, and as I’ve mentioned in the past, I feel like the decision is a very personal one–everything is based on an operator’s own particular preferences.
Over the years, I’ve written formal reviews about most of the field radios in my collection. In those reviews, I try to take a wide angle view of a radio–to see how it might appeal to a number of types of operators. I highlight the pros and cons, but I don’t focus on my own particular take because, again, my style of operating might not match that of readers. I try to present the full picture as clearly as I can and let the reader decide.
The Getting To Know You series gives me an opportunity to highlight one radio at a time and showcase what I love about it and why it’s a part of my permanent radio collection. After we spend a bit of time talking about the radio, we’ll do a park or summit activation with it!
The Elecraft KX3
I was originally introduced to the Elecraft KX3 at the 2011 Dayton Hamvention–over a decade ago at time of posting!
I was commissioned to write a review of the KX3 for the Monitoring Times Magazine and Elecraft was kind enough to lend me a brand new KX3.
At the time, there was nothing like the KX3 on the market and I felt like I’d just received a radio from the future.
The KX3 offered 160-6 meter general coverage with an optional 2 meter module, ATU, internal AA battery compartment, and roofing filters. The controls were top mounted and current draw in receive was as little as 150 mA. At the time, there was no other radio on the market that could compare with the KX3’s field prowess.
But it wasn’t just its field design that was impressive.
This field radio sported a bullet-proof front end and true contest chops, displacing $10,000+ high-end rigs.
Today, the KX3 (at time of posting) is still number 12 on Rob’s list. An impressive feat!
Herein lies the danger of doing reviews…
I didn’t have the KX3 in my grubby little hands for more than a few hours when I decided I had to buy one. I sold some gear to free up money and I bought the KX3 Elecraft sent me on loan for the full price.
I’ve taken this KX3 on numerous activations and on international travels. It’s a brilliant QRP companion.
These days, it’s in the shack more than in the field because I keep it hooked up to my KXPA100 amplifier. I feel like the KX3/KXPA100 combo is like having a poor man’s K3. As a huge bonus, the KX3 takes up little space on my table and the KXPA100 sits on a shelf–the overall footprint is much smaller than a K3 or K3s. It’s like having a remote head on my desk and works perfectly for my limited space shack.
The KX3 is a stellar, benchmark field radio, so it was great fun to feature it in this video.
I’m getting used to having an electric vehicle for my weekly travels including POTA and SOTA excursions.
My Volvo C40 has a published range of about 226 miles on a 90% charge, but I find that I actually get more than that. I almost never need to recharge from a public charger–I just plug it in at home.
At least once a week, I visit my parents in Hickory, NC and that round trip (including errand running in town) logs a good +/- 200 miles. By the time I return to the QTH, I typically have a comfortable 20% charge left on the battery.
Many of the parks I activate in that travel corridor are 20-30 minute detours off of Interstate 40 (for example: Lake James SP, South Mountains SP, Tuttle Educational SF). They have no negative impact on my ability to make it back to the QTH with battery capacity to spare.
Parks, however, that are still close to Hickory, but in the opposite direction of home, may necessitate a quick charge at one of the many public charging stations along the road. Not a big deal, but it’s kind of fun when I can do a full trip on one charge.
Flag at half staff in memory of September 11, 2021
On Monday, September 11, 2023, I had a full afternoon open and really wanted to fit in a proper hike. One of my favorite easy six mile loop trails–the Lakeshore Trail– is at Lake Norman State Park.
Lake Norman, however, is in the opposite direction of the QTH and is about an 80 minute round trip. I fit in errands along the way, but going there means I’ll need a bit of a charge to get back home the following day.
After a little research, though, I discovered that Lake Norman (much like Lake James) has free EV charging at their visitor’s center! Woo hoo!
Lake Norman State Park (K-2740)
I arrived at the park in the early afternoon and–whew!–both of the EV charging stations were free. In fact, the visitors’ center parking lot was almost empty–I would have expected a few more cars. I found that curious.
I plugged in my car, put on my hiking boots, grabbed my hiking sticks, then made my way to the spur trail that connects the visitors’ center parking lot to the Lakeshore loop.
Only, when I reached the trailhead, there was a notice stating that all of the trails were temporarily closed. Wait…what?
This may explain the lack of visitors.
I was bummed to say the least. My backup plan would be to hike the road at Lake Norman, but that’s not nearly as fun as a proper trail.
I then walked to the visitors’ center and asked the staff inside about the trail closures. They pointed out that there was one small loop trail–next to the visitors’ center–that was still open.
I was pleased to hear that and decided that instead of hiking one long loop, I could simply hike the same small loop several times.
I thanked them then gave them a donation (which I was going to do anyway) especially since I was getting free EV charge!
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Long time QRPer.com contributor and supporter, Jonathan (KM4CFT) has designed and started producing ultra-compact end-fed antenna kits (eBay affiliate link).
