Tag Archives: Tufteln

Antennas, CW, Field Reports, News, POTA, QRP, Skills

N5FY’s First CW POTA Activation!

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My First CW POTA Activation

by Joshua (N5FY)

As I often do, I hunted yet another CW POTA activator during my lunch break while working from home.

I have been learning CW for most of the year. Early on, I realized that with a bit of practice sending, and after listening to recordings of POTA activations, like those from Thomas, I could reliably send the proper exchange needed to hunt a POTA activator.

If you can give your call sign, signal report, and state abbreviation, you can make the contact. I started early on with just the basics and then added some of the common “extras” like GM for good morning, TU for Thank You and then 73. Not only is this great practice for getting on the air sending CW, it’s also very rewarding while learning CW. The exchange is short, standard, and easy to follow with a bit of practice.

CW Practice with the Morserino32 and a Cup of Coffee
CW Practice with the Morserino32 and a Cup of Coffee

Once I finished my upgrade to Extra I focused all my spare time, not much though truth be told, on practicing CW.

At some point this summer I set the goal to Activate POTA/SOTA during the W4G SOTA campout this fall. This really wasn’t an aggressive goal, one I figured was attainable but also one that I could hold myself accountable to even knowing I had a very busy summer ahead of me.

W4G SOTA Campout Summit View Yanah Mountain Bald
W4G SOTA Campout Summit View Yanah Mountain Bald October 2022

During one of the LICW Club classes I heard again that their goal is to get Hams on the air to make a QSO. I thought to myself, yes, that is great, and I want to do more, but I know I have made many QSOs in CW on the air, albeit very short and simple ones. So, I was curious how many.

I jumped on the POTA site and looked up my statistics. I was surprised at how may hundred I had, and yet at the same time, I was a bit disappointed. It’s not that I wanted to have made more CW contacts, it’s that I realized that they were ALL from hunting and not a single one was from calling CQ.

So, I changed my goal.

I know that Hams, especially CW operators, are a great bunch of people and they want to see new CW operators succeed, so there is lots of patience when you call CQ. So, I decided to move up my timeline. This was on a Thursday, and Saturday was a likely candidate for a POTA outing, why not–?

Saturday was my birthday, and I knew I could get away with some personal free time in the morning where I could dive in and call CQ POTA DE N5FY. The next day, Friday, I firmed it up, I would head out in the morning, bring the new to me KX2 and see what happens.

Surprisingly, I was much less nervous than I expected, I had told myself that it wouldn’t help anyways to be nervous so just do it and see what happens. I made it to my local park, to the picnic table I frequent, then setup a No Transformer 2-Wire antenna with the KX2. One press of the ATU button and I had a 1:1 match on 40m band.

Of course, I have great timing. I could not believe the stations on the air on 40m. I never did look but there must have been a contest. I moved up and down about 20kHz and there were stations everywhere! I called “QRL?” on 2 different frequencies and had a reply before I landed on open frequency where I could call CQ.

N5FY First CW Activation KX2 Setup
N5FY First CW Activation KX2 Setup

I had not scheduled the activation; I knew I had a bit of cell phone coverage at this park, so I set the CQ POTA message to calling while I posted a spot.

After two calls, I had my first call back. It was time!

I could have freaked out here, but I was too focused on decoding to even be nervous! Of course, I had to send a partial call and a “?” once or twice to get the full call right. Of course, I made some keying errors. But the caller had patience and worked me and we made the QSO. Now I was really excited!

I called CQ and someone sent me back dits and dahs, and I decoded what they were sending! Boy, this was fun! I continued to call CQ POTA, and tried my best to decode the replies, several pileups, and lots of “?” sent by me. But I was making contacts and having a blast!

After a couple of silent CQ calls later, I switched to 20m. And, again, started to get replies back as well as a couple small pileups. In the end, there were a couple call signs that I could not look up, l had a letter or two wrong, but with almost 20 in the log I knew I had an activation and boy was I happy!

N5FY First CW Activation QSO Map
N5FY First CW Activation QSO Map

Looking back on the activation, and after talking to another Ham, it occurred to me why I wasn’t as nervous as I thought I might be.

You see, when you are the Activator, when you call CQ, the ball is in your court, you invite people to call back and they are there for you. I almost get more nervous hunting as I don’t want to slow down an activator or run over another caller. But when you are the one calling CQ, it’s your game!

Of course there were several hiccups along the way. For one, it got HOT sitting in the sun. I ended up deploying my hiking chair on the table as a sunshade and pulled a portable fan out of the car. Even the action camera overheated while recording the activation. I couldn’t get the KXPD2 paddle to key the KX2 on 20m when I first got setup. And of course, I had lots of sending errors (although fewer than I expected to have) and sent a A LOT of “?” asking for a repeat.

That said, I am very glad to have jumped in and will continue to activate CW going forward as I continue to build my CW skills. For me, confidence in the ability to Activate on CW is great motivation for practicing, which again, is my biggest learning. If I want to be a good operator, I need to put in the effort, and going out to play radio is one extremely fun way to practice!

73 Joshua N5FY

Antennas, Field Reports, News, Portable, POTA, QRP, Videos

POTA with a 20 Meter Vertical Delta Loop and the Elecraft KX2!

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There’s a portable wire antenna design I’ve been wanting to put on the air for POTA and SOTA for what seems like ages: a 20 meter vertical loop.

I mentioned in a Ham Radio Workbench podcast episode a few months ago that I planned to build a field-portable delta loop antenna and that led to a mini discussion about configurations, feed points, height off the ground, etc. and how all of those factors can influence the characteristics and dynamics of the antenna.

Vertical loops are pretty fascinating and incredibly effective.

Delta loops are super easy to build (no more difficult than an EFHW) but this summer has been insanely busy for me and I simply hadn’t gotten around to it yet.

Then my good friend Joshua (N5FY) who runs tufteln.com sent me a prototype 20M delta loop in the mail. We’d been talking delta loops and he couldn’t help but build one. He asked that I take it to the field and put it on the air, then give him any feedback and notes I might have.

Joshua’s design incorporates a 4:1 transformer and was cut to be resonant on 20 meters. I’d actually planned to build one identical to this because the type of loops I’ve deployed at home have been fed with ladder/window line which isn’t as portable as something I could feed with RG-316.

Holmes Educational State Forest (K-4856)

On Friday, September 1, 2023, I grabbed the delta loop antenna and the KX2, then made my way to Holmes Educational State Forest.

I knew that Holmes wouldn’t be busy and that there were a number of options for spots to set up.

After a little scouting, I found a great site to set up the antenna.

I planned to set up this antenna as close as I could to an equilateral triangle with the apex up about 30 feet and the feedpoint in the middle of the base of the delta.

Deploying the antenna in this configuration meant that I only needed one line in a tree to hoist the apex of the delta and two lines to pull out the corners of the base.

I brought along some paracord with tent stakes to secure the base corners of the loop. In the end, though, I simply attached the paracord to trees instead of using the stakes.

I (somewhat reluctantly) made a video of the entire activation including the antenna deployment. I wanted to take my time deploying this antenna for the first time, so the antenna deployment section of the video is much longer than usual.

You absolutely cannot see the loop in this photo, but it’s there…I promise!

In the end though? It wasn’t as difficult as I thought it would be. The last vertical delta loop I deployed was a 40 meter loop which is roughly double the size–in my head I was expecting the aperture to be larger than it was.

My arborist line and 12 oz weight hanging to provide a gentle tension to hold the apex of the loop up.

The 20 meter loop is actually pretty compact and almost as easy as setting up as an inverted vee.

With my loop properly deployed, it was time to hit the air! Continue reading POTA with a 20 Meter Vertical Delta Loop and the Elecraft KX2! →

Antennas, Field Reports, How To, News, Portable, POTA

The joy of a low-slung wire

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(As is my usual, this article has a bunch of links – click on as many as you wish to receive the full experience)

by Vince (VE6LK)

In May of 2023 I embarked on a two week vacation to Hamilton Ontario that co-incidentally happened to include a side trip to Hamvention just outside of Dayton, Ohio.

For a guy living in Alberta, Canada, this would prove to be quite the trip and it created memories to last a lifetime. I also was told that I could play radio during the trip provided my wife would get to see some of the many waterfalls in the City of Hamilton, the area we’d call home for our two week trip.

At Niagara Falls

Yes, I did take a brief detour to Niagara Falls while on the trip as it is only an hour from Hamilton.

And thus the planning began. I started overlaying POTA entities that overlapped on waterfalls so we both could visit and enjoy in our own way. It also meant I had to figure out what radio gear and, most importantly antennas, to bring along.

I landed up mostly running with low-slung antennas. By this I mean something between 4 and 10′ off the ground and horizontal in orientation. But it’s what I discovered about this simple approach that made it appear like pure magic to me – I made great contacts at what I would consider to be beyond NVIS distances including one from OH to UT!

Continue reading The joy of a low-slung wire →

Antennas, CW, Field Reports, News, Portable, POTA, QRP, SOTA

Testing a new Tufteln knee board and antenna during this beautiful SOTA activation on Mount Mitchell

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On the morning of November 4th, I woke up with one thought on my mind: “I need to activate Mount Mitchell before it’s too late!”

It’s not like Mount Mitchell was going to disappear, but I knew I was already on borrowed time since the long section of the Blue Ridge Parkway I use to drive to Mount Mitchell from Asheville typically closes in the early part of November for weeks at a time. The park itself will close to guests too–in fact, last year, it closed its gates as I drove out of the park! There are often other roads open to Mitchell in the winter, but they’re very much out of the way for me and frankly, weather can shift and the park close at the drop of a hat.

As the crow flies, Mount Mitchell is actually very close to my QTH. If I wanted, I could hike there directly from my home. I’ve yet to do this, however, because with the 3,000′ elevation change and the anything-but-direct trails that skirt the Asheville watershed, I’d need a full day or more to hike it one way. I will for sure do this sometime, but only when I can pack appropriately and reserve a campsite.

Morning drive

As soon as I surfaced that morning, I check the weather map. I noticed that the temp at Mount Mitchell was actually slightly higher than at my QTH. I looked out the kitchen window and could see fog in the valley. This meant one thing: inversion!

When we have inversion, the cold air is pushed down into the valley and warmer air can be found at higher elevations. The flip opposite of what you’d typically expect.

I ate a quick bite, grabbed come coffee, and hit the road.

As I drove past Warren Wilson College’s farm, it was absolutely gorgeous. I had to stop and take a photo or two [click images to enlarge].

The drive up to Mount Mitchell on the BRP was ideal: clear skies and quite warm!

Mount Mitchell State Park (W4C/CM-001 and K-2747)

In fact, I felt like I really struck it lucky that day. I didn’t even need a heavy jacket or gloves. Continue reading Testing a new Tufteln knee board and antenna during this beautiful SOTA activation on Mount Mitchell →

Accessories, Antennas, Articles, CW, News, QRP, Reviews

A Few Field Radio Gift Ideas for Less Than $100!

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I received an email from a reader’s spouse asking about gift ideas for the holidays and beyond; ideas that could not only be used this month, but also tucked away for the future. They weren’t looking for the obvious things like a transceiver–they were looking for accessories that might enhance their significant others’ field radio fun.

Being the enabler I am, I was happy to oblige and, in fact, decided to turn my reply into a post (since it quickly turned into a very long email) with their permission. For obvious reasons, I’m keeping their ID secret! 🙂

Here’s a rather random sampling of things that came to mind. I tried to limit this to items that retail for less than $100 US. Note that some of these product links are affiliate links:

A quality LiFePO4 battery

Being a QRPer, I don’t need a large battery to enjoy hours of radio fun per charge. My favorite battery chemistry is LiFePO4 due to its weight, safety, shelf life, and recharge cycles (which is in the thousands as opposed to hundreds).

For me, a 3Ah battery is more than enough capacity to keep my QRP radios on the air for 3-5 activations per charge (depending on length of activation, etc.).

I’m a big fan of Bioenno batteries. Their customer support is excellent. You can purchase their 3Ah 12V battery for $64.99 US including the charger. If you already have a charger, the battery alone is $49.99. Click here to check it out.

If your significant other likes to push 100 watts, consider a larger capacity battery. I also have a 15Ah Bioenno battery for this purpose, though it exceeds the $100 gift price threshold). Click here to check it out.

A very affordable Li-Ion rechargeable battery


One of the most affordable rechargeable battery packs for the QRPer in your life is the TalentCell Rechargeable 12V 3000mAh Battery Pack. This pack typically costs around $30 US and is sometimes even less expensive.

This little pack is great because it will not only output 5V to recharge USB devices, but it also outputs 12 volts which is brilliant for QRP radios like the Elecraft KX series, TX-500, FT-817/818, Mountain Toppers, Penntek TR-35,  Venus SW-3B, and many others. I actually now pair this with my QCX-Mini. The battery comes with the charger and standard barrel connectors on the included DC cord which fits Elecraft and Penntek field radios among others.

This is a small battery, so can only be paired with efficient QRP radios.

While I don’t consider this a high-quality solution like a Bioenno battery, it is insanely useful and affordable. Click here to check it out.

Morse Code Keys!

I could easily write a series of articles about Morse Code keys. That’s not what you’re looking for, though, right? You want some quick suggestions. Here is a sampling of some of my sub $100 favorites listed in alphabetical order.

If your budget is flexible, you might also consider these paddles which are still less than $200:

Okay, so if you don’t mind pushing more than $200, I highly recommend any key made by the amazing Begali family. Their Simplex paddle was my first set of paddles and I still use them today. I plan to buy their Traveler next year. They’ve a massive selection of models and styles. Continue reading A Few Field Radio Gift Ideas for Less Than $100! →

Antennas, Articles, How To, News

Joshua explores Unun insertion loss (efficiency) comparison testing

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Many thanks to Joshua (KO4AWH) who shares the following guest post:

Unun Insertion Loss (Efficiency) Testing

by Joshua (KO4AWH)

A simple “side-by-side’ method can be deployed with the use of a Calibrated NanoVNA to read back “S21 Gain” which is, in this case, signal loss from the output of S11 back into S21 through the identical windings. The gain (loss) reading in negative dB gives us the total signal loss through the windings. We can then divide by 2 to get the loss through one winding and then convert with a bit of math to an efficiency number.

p = 10^(x/10) * 100 where p = percentage 0-100% and x = loss in dB

Example: -2dB reading on “S21 Gain” on the NanoVNA divide by 2 for a loss of -1dB on each winding would be 10^(-1/10) * 100 = 79.4%

We have a 50 ohm signal coming out on S11 of the NanoVNA through the first winding to some unknown exact impedance but that is then converted back through the second unun into the S21 port where the signal is measured. It is therefore necessary to use identical windings for each test to ideally match the impedance change.

I like to run the signal test with the top and bottom of each band, take the average of the two, and then convert to efficiency, 100% being perfect. I record these values to then chart each band’s efficiency for the winding pairs. The goal here is to compare the different windings. For example, with a 9:1 used for a long/random wire, compare toroid sizes, number of toroids and in some cases the number of windings. One nice advantage to a 9:1 Trifilar winding is that you can increase or decrease the winding count in multiples of 3 while maintaining a 3:1 winding ratio. Take the square of the windings ratio (3) to find the impedance ratio of 9:1.

Here is one example of two different windings compared. Both are Trifilar but one with a single T80-2 toroid and 9 sets of turns and the second with a Double T80-2 and 12 sets of turns. 100% would be zero signal loss through the windings, 0% would be full signal loss. -3dB (loss) per winding would equate to a 50% efficiency in either single winding.

The difference between these two windings across the Amature Bands was quite surprising to me. I assume typical, often used windings will be decent across the bands. Here we saw a large improvement in access to the bands by adding several extra turns.

When each component of the station induces loss to the radiated signal, or the ability to receive, you have to improve each area for the best transmit and receive capability. This test is not foolproof, it is not the most accurate way to measure efficiency and maybe not the easiest but it gives me a comparative analysis of various windings with the tools available to me. If I can increase the performance of my windings, I can increase the performance of my station. Time to wind some more transformers!

Joshua

KO4AWH

Tufteln Antennas

Tufteln.net

Accessories, Antenna Tuners, New Products, News, Portable

The Elecraft T1 Protection Case by Tufteln

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Long-time QRPer.com reader and supporter, Joshua (KO4AWH), runs an Etsy store with a wide range of products primarily designed for field operators. Over the past few months, Joshua has sent me various prototypes for feedback and also to test in the field. You’ll see some of his antennas in upcoming field reports and activation videos. I’m very impressed with his designs.

If you’re an Elecraft T1 owner, you should be especially interested in his T1 Protection Case.

Joshua sent me an early version of this clip-on case several months ago and it immediately replaced the simple cover I printed from a Thingiverse file. (To be clear, the Thingiverse case served me well for a couple years, but I prefer this one since it doesn’t require a rubber band to hold it on the T1.)

The Elecraft T1 is a hearty little ATU and I don’t worry about damaging it while tucked away in my SOTA pack, but the little buttons on the front are prone to be pushed with any amount of applied pressure. This can result in unintentional operation which can accidentally place it in bypass mode or at least shorten the life of your 9V cell.

The Elecraft T1 is not an inexpensive station accessory and, at the moment, they’re about as rare as hen’s teeth. The lead time on new T1s is counted in months rather than weeks (at time of posting, this is due to vendor board issues).

The Tufteln Protection Case simply snaps on the Elecraft T1 and protects the BNC connectors, ground point, and the front panel buttons.

The case material is durable and adds very little to the bulk of the T1.

Of course, you can’t operate the T1 with the case around it because the BNC connectors are covered, but I have propped up my T1 on the case while using it on rough concrete picnic tables. I’d rather the case be scratched than my T1!

If you own an Elecraft T1 and don’t have a protective cover, I’d encourage you to either print one, or buy Joshua’s T1 case. For years, I simply removed or reversed the 9V battery to keep the T1 from engaging while packed, but that doesn’t protect the buttons and (frankly) it’s a pain to pop the battery out and flip it for each use (then to remember to flip it back when packing away).

The Tufteln case is a simple and affordable ($16.50) solution!

Thanks for sending this to me, Joshua. I dropped my T1 while setting up my TX-500 for Field Day and it protected my favorite little ATU!

Click here to check out the Elecraft T1 Protective Case on Etsy.