Category Archives: QRP Radios

Field Reports, New Products, News, Portable, POTA, QRP, QRP Radios, Videos

CFT1 QRP: Labor Day Morning POTA with Vlado at Lake James State Park!

2 Comments

Labor Day weekend turned out to be full of labor here at QTH K4SWL. My wife and I had numerous projects to tackle, and my daughters had various activities scheduled as well. By Sunday, my wife looked at me and said, “You need a break. Why not spend tomorrow catching up on POTA?”

That was music to my ears.

I messaged my buddy, Vlado, to see if he might be interested in joining me, and he quickly replied, “Of course!”

So on Monday, September 2, 2024, Vlado packed his radio gear in my car, and we discussed where we should go. We had most of the day for radio, but we needed to decide if we’d head north, south, east, or west. In the end, we chose to travel east, as it offered the most options, including one site Vlado had never activated.

We decided to start at Lake James State Park. Since Vlado had only activated Lake James for the first time the previous day at the Paddy’s Creek Access, we opted for the Catawba River Access.

Lake James State Park (US-2739)

It was Labor Day, so we knew Lake James would get busy around lunchtime, which is why we hit it early. I also knew Paddy’s Creek Access would be much busier today because it has the beach, and I remembered how full the parking lot was during my Labor Day activation in 2023!

At 9:00 AM, when Vlado and I arrived at the Catawba River access, we were among the few people there, so we had our pick of spots to set up the POTA station.

For convenience—especially since there had been a deluge of rain the night before—we chose a spot close to the car, where I’ve activated a number of times in the past.

I also took this opportunity to show Vlado how to use an arborist throw line.

While I didn’t record the antenna deployment—frankly, I didn’t think about it at the time—I wish I had. Vlado was a natural!

On his second-ever throw, he snagged the perfect branch to deploy a 40-meter end-fed half-wave antenna.

CFT1 Time!

The CFT1 with Tufteln cover/stand, audio cable and pack with battery.

I knew exactly which radio I wanted to operate during this activation: the CFT1 by Jonathan (KM4CFT).

I had only recently swapped out my Beta unit for a production CFT1. As a thank-you to Beta testers, Jonathan let us keep the units we tested. I worked with Jonathan and Dan to return the Beta unit and compensate them for the difference.

In truth, there were only a few changes, mostly cosmetic, between the Beta and production units. The biggest improvement for me was that the Beta unit lacked a way to adjust the sidetone level independently from the AF gain. The production unit has this feature, which was my primary motivation for upgrading.

In addition, I prefer using radios that match what my readers and subscribers have. When I use a Beta unit, even if the changes are purely cosmetic, it generates more questions.

Interestingly, this wouldn’t be Vlado’s first time using the CFT1. He must have been one of the first people outside the Beta testing team to try it because we used it on Field Day alongside the TR-45L and X6200 (although you won’t see it in my report since it was still somewhat of a secret project at the time).

We paired my MW0SAW 40-meter EFHW and Bamakey TP-III with the CFT1. I also used my Anker Soundcore Mini speaker for audio.

Time to POTA!

Gear:

Note: All Amazon, CW Morse, ABR, Chelegance, eBay, and Radioddity links are affiliate links that support QRPer.com at no cost to you.

On The Air

Beforehand, Vlado and I decided to set up just one station and take turns activating.

Vlado went first! He called CQ POTA, and hunters started replying. Continue reading CFT1 QRP: Labor Day Morning POTA with Vlado at Lake James State Park! →

Field Reports, Morse Code, New Products, News, Portable, POTA, QRP, QRP Radios, Videos

The New Venus SW-6B QRP Transceiver: First POTA Activation and Field Test!

13 Comments

Yesterday morning, around 12:00, I picked up a DHL parcel containing the Venus SW-6B. I was so eager to test it in the field that I dropped my lunch plans, took the SW-6B home, opened the box, and quickly attached Anderson Powerpole connectors to the supplied power cable.

I didn’t have time to do anything else, not even turning on the radio.

After doing some back-of-the-envelope calculations, I realized that if I skipped catching up on my email backlog (sorry!), and instead jumped in the car, I could fit in a one-hour activation on the way to visit my dad in Hickory, NC, that afternoon.

Not wanting to compete for the one picnic table at the South Mountains State Park Clear Creek access (the fastest detour), I decided to head instead to the Lake James State Park Catawba River Access en route. There are plenty of site options at Lake James, and mid-afternoon on a Tuesday, I knew it wouldn’t be crowded.

Lake James State Park (US-2739)

The weather was absolutely beautiful, and I was right: there were very few people at Lake James.

I left the QTH in such a hurry that I didn’t have time to gather all the components for the SW-6B field setup. Instead, I grabbed my SOTA backpack (which should, in theory, have an antenna, cable assembly, throw line/weight, key, and other necessary adapters and accessories).

I found a picnic table with plenty of antenna deployment options (i.e., trees!).

Luck was on my side, too: my first throw of the throw line made a perfect arc into a tree, giving my 40-meter end-fed half-wave an ideal configuration.

While deploying the antenna, a groundskeeper nearby started mowing a patch of grass with possibly the noisiest mower I’ve ever heard. 🙂 It was so loud I actually had to wait for him to move on because I found myself shouting at the camera mic. Ha ha!

As I mention in the video, this is just the kind of QRM you should expect at a good park. The grounds at NC parks are truly outstanding, which takes a lot of work, and I’m very appreciative. It was just a minor inconvenience.

SW-6B Setup

After deploying the antenna, I set up the SW-6B and spent some time in the video (below) explaining the front panel controls.

I noted in the video that I purchased one of the very first production models listed on the Venus website.

There are a few options available: a metal case, a plastic case, and with or without an internal battery pack.

At the time, Dale (BA4TB) only had the metal case version built, so that’s what I ordered, with an internal battery. It’s the priciest option. The total cost, including DHL shipping to the US, was $344.30.

The metal case is very basic. One downside is that it doesn’t have a positive latch—there’s no easy way to secure the lid. For example, if you turn it upside down, it will open. The plastic version has latches—knowing this, I would have much preferred the plastic case.

That said, the metal case has a lot of charm. I plan to secure it with an elastic band or see if I can adapt mine to a plastic case later.

The internal battery didn’t come fully charged, of course, but it showed 11.3V, which is well within the SW-6B’s voltage range. Knowing this would be a short activation, I opted to use the internal battery instead of grabbing my (comically large, compared to the SW-6B) 15Ah battery from the car.

After turning on the radio, I was pleased to find that the internal speaker provided plenty of amplification for field operations.

It was time to get the SW-6B on the air!

Gear:

Note: All Amazon, CW Morse, ABR, Chelegance, eBay, and Radioddity links are affiliate links that support QRPer.com at no cost to you.

On the Air

I started calling CQ POTA on the 20-meter band and quickly discovered that propagation was unstable.

That said, for the first time ever, my first three contacts were all Canadians: VA3NU, VA2CT, and VA2IDX. Nice! Continue reading The New Venus SW-6B QRP Transceiver: First POTA Activation and Field Test! →

Field Reports, Guest Posts, Portable, POTA, QRP, QRP Radios, Videos

Christian takes his new “Red Corners” uSDR+ on a POTA shake-out activation

4 Comments

Many thanks to Christian (IX1CKN) who shares the following field report:

How the Red Corners uSDR+ Performed on Its First Field Test

by Christian (IX1CKN)

24 QSOs in 104 minutes at 5 watts—how would you rate that? The answer isn’t exactly scientific, as it depends on personal opinions, habits, and the unique propagation conditions during the activation. But in my eyes, as the first test of the “Red Corners” (a.k.a. USDR+), it’s definitely a positive result.

I wanted the “first time” with my new QRP radio (which has been catching the attention of more and more operators) to be out in the field, so on Thursday, the 29th August 2024, I headed to the Tsatelet Reserve (IT-0120) to contribute to the Parks on the Air (POTA) program.

I have to admit, I had doubts about reaching the 10 contacts needed for validation. I arrived at the site at 15:16 UTC and set up a 1/4-wave vertical antenna on the ground. I decided not to use an external mic, just the built-in one. The setup was then in “walkie-talkie” mode, fitting in one hand, leaving the other free for logging or filming. Conceptually and practically, it was real freedom.

The first few calls brought in four quick responses, one per minute.

Encouraging start, but then it felt like the band “died.” So, I adjusted, searching for stations that were calling in return. I found several, including Roberto (IG9ITO) from Lampedusa Island —always a pleasure to QSO with him—and I also logged Carmelo (IT9ESF) from Messina.

Between calling and moving around to catch other activators spotted on the cluster (thanks to the dual VFO, although you need to navigate through the menu to switch), I managed to increase the contact count to 24 by the end.

Notably, I logged 9 “park-to-park” QSOs, including the longest distance of the day—1820 km to TA1EYE. That’s a rare feat for a single activation. Some colleagues were operating from 2-fer areas, but I prefer to count unique calls, which is still interesting data.

It’s interesting because it shows that the “Red Corners” has the power to reach operators who, as activators, don’t necessarily have fancy antennas or are dealing with challenging terrain and horizon. It happened 9 times today, so it’s not a coincidence. I’d also like to point out that I didn’t use an external tuner. I noticed that adjusting the vertical whip length allowed for an SWR of 1.2 across the band, which I found acceptable. Plus, it feels like a solid device in hand and looks good sitting on a rock.

What else can I add that the video below doesn’t show? The “Red Corners” uSDR, like the Quansheng UV-K5 (another recent “must-have”), has some objective limitations. I won’t rehash them here—there are plenty of posts covering that. This makes it impossible to consider this Chinese QRP rig as a replacement for our shack radios. However, considering its limitations and focusing on portable use, its value for money becomes a strong point and offers an interesting angle.

The first test went well, but there will be more (I’ll also get the monoband whip, and it will be fun to try pure “walkie-talkie” operations).

73 and thanks, everyone!

Video

Click here to watch on YouTube.

New Products, News, QRP Radios

The Yaesu FTX-1F Portable HF Transceiver: Yaesu’s replacement for the venerable FT-818 and FT-817

92 Comments

Many thanks to Gavin (GM0WDD) who notes that ML&S have posted a product page for the new Yaesu FTX-1F. 

I was curious what new product announcements might come out of the Tokyo Ham Fair 2024–this is exciting news, indeed. 

The following specs and details all come from Martin Lynch and Sons:

The new FTX-1F will be available early 2025.

The new FTX-1F is a portable transceiver utilizing SDR technology and provides 6W of power output with the 5670mAh Lithium-ion battery pack (Which enables 9-hours stand-alone operating time on the HF bands, SSB mode, and 8-hours operating time on the V/UHF bands, FM mode based on a 6-6-48 duty cycle). Up to 10W of power output is available when using an external DC power supply.

    • FTX-1F – True All-Rounder
    • HF/50/144/430MHz All Mode Field Transceiver
    • Providing stand-alone 9-hours of operation

This information and the sample shown at HAM FAIR 2024 are only the preliminary introduction.

Detailed information will be announced at a later date.

A number of the fundamental and remarkable features of the new FTX-1F are:

    • Operation in SSB, CW, AM, FM and C4FM digital modes
    • SDR Technology and 3DSS (3-Dimensional Spectrum Stream) on a 4.3-inch high-resolution full-color touch display
      panel
    • Two independent receiver circuits provide true simultaneous dual-band operation, whether in the same band or in
      different bands. For example: SSB communication on HF bands simultaneously with C4FM digital communication
      on V/UHF bands (*HF+V, HF+U, V+V, U+U, V+U, U+V)
    • Two Loud speakers ensure clear and powerful audio output
    • An optional Automatic Antenna Tuner can be attached to the rear of the transceiver with the 5670mAh high-capacity
      Li-ion battery pack. The optional Cooling-fan, which is necessary for comfortable FT8 operation, can also be
      combined with the antenna tuner. (All-in-one rear panel design)
    • RF front-end and Low Noise Reference Oscillator, enable Phenomenal Multi-signal Receiving characteristics
    • Effective QRM rejection afforded via High-speed 32-bit IF DSP (YAESU’s renowned interference reduction
      systems: SHIFT / WIDTH / NOTCH / CONTROUR / APF / DNR / NB)
    • Compatible with WiRES-X operation
    • PMG (Primary Memory Group) function can register and monitor up to 5 frequently used frequencies
    • MAG (Memory Auto Grouping) function enables Memory Channels to be categorized in each band that can be
      quickly recalled by band groups (HF/VHF/UHF/AIR/OTHERS)
    • USB ports support CAT operation, audio input/output and TX control

The new FTX-1F will be available early 2025. Please be ready for this forthcoming exciting new radio!

When I asked, in the past, what readers would like to see in an FT-818 replacement, many wanted a spectrum display and SDR technology–it seems like Yaesu was listening.

There’s no built-in ATU, but it appears they will have an “[a]n optional Automatic Antenna Tuner can be attached to the rear of the transceiver with the 5670mAh high-capacity
Li-ion battery pack.”

What’s most surprising is that the FTX-1F has two independent receiver circuits. This is quite an innovation in the world of field-portable HF radios.

I will post more details when they become available. Very curious about the output power, size/weight, and and receiver specs. It would be brilliant if they managed to  get FTDX10 receiver performance in this portable form-factor.

Stay tuned!

Everyday Carry, Field Reports, News, Portable, POTA, QRP, QRP Radios

KH1 to the Rescue! A postcard field report from Pisgah National Forest.

18 Comments

On Friday afternoon (August 16, 2024), after dropping off one daughter at her volunteer job and the other at Shakespeare class, my wife and I had about 90 minutes of free time before the next scheduled activity.

We opted to visit the Sycamore Flats Picnic Area in Pisgah National Forest (US-4510) so that I could fit in a POTA activation while my wife caught up on a project she’d been working on.

The picnic area was bustling with activity–the busiest I’d seen it in a while. No doubt, everyone was out enjoying the beautiful weather and the last hurrah before many local kids head back to school. Nevertheless, we found a nice picnic table to set up and play radio.

I did not have all of my camera gear with me, so opted not to film this activation with my phone.

Since there’d be no video, it meant that I could operate with earphones and a minimal amount of extra gear. It’s nice to do this every so often!

On the way out the door, earlier that day, I grabbed my Mountain Topper MTR-3B field kit. The goal was to put it on the air since it had been a few months since I last used it. I like rotating out radios regularly so I don’t forget nuances of operating them while in the field.

The previous day, I also charged the two Li-Ion rechargeable batteries [affiliate link] that are stored in the MTR-3B Pelican case. At least I thought I charged them!

When I checked the batteries, they were both completely dead. Turns out, the USB charging station I’d connected them to the previous day was not plugged into an AC outlet. Doh!

This presented a little problem because the only other battery I had in my GR1 rucksack was a 3Ah LiFePo4 battery which likely pushed about 13.2VDC. The MTR-3B doesn’t care for voltages much higher than 12VDC–at least, if you are higher than 12V, you need to make darn sure you’ve got a great SWR match.

I was a bit bummed because I hadn’t packed a backup radio in the GR1 and I wasn’t driving the Subaru which has a Venus SW3B headrest field kit.

Hang on…

Then it hit me…I’ve got my EDC (Everyday Carry) radio with me: the Elecraft KH1! Woo hoo!

I went back to the car and grabbed my Trakke EDC bag.

Then pulled out the KH1 packed in my Tufteln-modified Pelican Micro M40 watertight case.

It is such a luxury to have a small, lightweight, and versatile radio always at the ready in the backpack I carry with me everywhere.

Since I’d already deployed my K6ARK 40 meter counterpoise-less end-fed half-wave [affiliate link], this was the antenna I connected to the KH1.

I also grabbed the Bamakey TP-III from my GR1 pack and the 3×5 Rite in the Rain Pad and Zebra mechanical pencil [again, affiliate links] from the MTR-3B kit (don’t worry, I returned these to their respective kits post-activation!).

I had announced this activation on the POTA website, so hypothetically, the RBN should auto-spot me.

I turned on the KH1, moved to the 20 meter band, and was tuning around looking for a clear frequency when I heard a station calling CQ POTA. Continue reading KH1 to the Rescue! A postcard field report from Pisgah National Forest. →

Announcements, Field Reports, New Products, News, Portable, POTA, QRP, QRP Radios, Videos

Introducing the New CFT1 Five Band Portable CW Transceiver Kit!

15 Comments

My buddy Jonathan (KM4CFT) made a big announcement this morning.

He’s been working tirelessly since the start of the year, designing and testing a brand-new field-portable CW transceiver he’s dubbed the CFT1.

As of this morning, you can purchase the transceiver kit on HamGadgets.com.

A little backstory

Jonathan first mentioned his plans to design a CW transceiver back when we were doing a joint POTA activation at the end of December 2023. At the time, it was just an idea. When he said he planned to have it ready for sale in 2024, I was skeptical. I mean, he had a day job and had never designed a radio before. How could he pull that off in such a short timeframe?

Fast forward to Four Days in May/Hamvention in May 2024, and wouldn’t you know it, Jonathan had a working prototype on display! I was blown away. Within a couple of weeks, he was contacting us beta testers, eager to get revision one units into our hands.

I got my CFT1 in June and immediately put it through its paces in the shack. Even in beta, this little radio was rock solid – I was seriously impressed!

I thoroughly tested the CFT1 in the shack, both on a dummy load and with my QTH antenna. If you’re into SOTA or POTA and I worked you in June, chances are it was with the CFT1.

Vlado (N3CZ) making field day contacts.

I even took the CFT1 out for a spin on Field Day. Vlado (N3CZ) and I were both impressed with how well it performed in that crazy RF environment. Remember, this isn’t a contest radio, but it didn’t seem to overload at all. Impressive!

When I heard Jonathan was launching the CFT1 today, I figured I’d do a quick POTA activation to showcase this awesome little radio.

The Blue Ridge Parkway (US-3378)

Yesterday morning, I was heading to Mission Hospital in Asheville to visit a family member who had just been admitted. I realized I had enough time for a quick activation at the Folk Art Center on the way.

I arrived at the parking lot around 8:30 AM. It was pretty empty except for the grounds crew. I set up at my usual picnic table.

I paired the CFT1 with my KM4CFT End-Fed Half-Wave, trimmed for 30M with a 40M linked extension. I was hoping for some 40-meter action early in the morning. Setup was a breeze. My throw line cooperated beautifully – the 40M EFHW was practically vertical!

Naturally, I filmed the whole process: setup, activation, and pack-up. Before I started the activation, I spent a few minutes talking about the CFT1 – its design philosophy and what I like about it. Hopefully, this will help you decide if it’s the right radio for you.

Gear:

Note: All Amazon, CW Morse, ABR, Chelegance, eBay, and Radioddity links are affiliate links that support QRPer.com at no cost to you.

On The Air

I spotted myself on 40 meters and started calling CQ using the CW message memory I’d already programmed with “CQ POTA DE K4SWL.”

Fortunately, the band was healthy–at least, healthy enough to reply to a number of hunters. Continue reading Introducing the New CFT1 Five Band Portable CW Transceiver Kit! →

Kits, New Products, News, QRP Radios

KM4CFT Teases a New CW Field Radio!

12 Comments

My buddy, Jonathan (KM4CFT), is close to releasing a new CW Field Transceiver kit he designed for POTA, SOTA, and pretty much any other field radio activity.

Today, he shared the following photo, which is a bit of a teaser:

Those of you who attended Four Days in May this year may have already gotten a proper sneak peek and even operated a prototype of this radio.

Jonathan tells me that he’ll be releasing details in the near future and you’ll soon be able to order the kits via Radio Dan’s eBay store [eBay partnership link] or via his website.

Of course, I’ll also post details here on QRPer.com when the new radio kit is live and ready to order! Stay tuned!

Field Day, Field Reports, News, Portable, QRP Radios, Reviews

Field Day: It’s all about the audio…

9 Comments

If you listened to the latest Ham Radio Workbench Podcast episode–our Field Day Debrief–you will have heard that my Field Day was a pretty low-key event.

Originally, I had hoped to fly out to Oregon and hang with my friend George (KJ6VU) and his radio club, but there were just too many family activities happening this year for me to travel for a week.

Instead, my wife, daughters, and I met up with my buddy Vlado (N3CZ) and his sister, who was visiting from North Macedonia.

We met at the Zebulon Vance Birthplace (US-6856) and, luckily, had the picnic shelter to ourselves. The weather was gorgeous, and we put together a proper potluck picnic.

Field Day POTA

Vlado and I decided to do some casual Field Day operating, and I brought the radio gear.

Since I’m currently testing the Xiegu X6200, I brought it along to see how it might handle the RF-dense environment of Field Day.

We made a few contacts with the X6200, but the audio and receiver struggled in that RF-congested environment. This isn’t a surprise, in truth. Most portable field radios aren’t designed to have contest-grade performance—they’re designed for portability and functionality in normal field conditions.

The other radio I brought along was the Penntek TR-45L. I can’t remember if I’ve used it during Field Day in the past, but all Vlado and I could say was…

Wow!

The TR-45L sounded phenomenal!

I’ve always believed that the TR-45L (both the original and skinny version) has some of the best audio in the world of field radio. That is a major plus when it comes to Field Day.

The thing is, it also has a stable front end—the TR-45L receiver handled those packed RF conditions with ease. In fact, we were both amazed at how easily we could hear all of those competing signals. There was absolutely no listening fatigue at all, and both of us could hear weak and strong signals all occupying the same space..

It sounded distinctly analog and “pure.”

Vlado and I both tend to operate with filters wide open—using the filter between our ears—so the audio produced had excellent fidelity.

Vlado and I also made short work of Vesna’s Feta cheese bread!

A couple of times, we did narrow the TR-45L’s audio filter when there was a strong competing station, but by and large, the audio was so clear, we really didn’t need to.

Top-Shelf

The takeaway for me is that the TR-45L series radios have proper contest-grade performance even if they lack contest-grade filtering.

I shouldn’t be surprised because even its predecessor, the TR-35, can handle crowded conditions with ease.

I should add here that the supply of new Penntek radios may already be dried up. As I mentioned in a previous announcement, John (WA3RNC), is retiring and selling off all of his existing radio inventory.

According to his website, he might still have some TR-45L Skinny models, but that’s it. In fact, that notice was dated May 28, 2024, so I’m not sure if it’s still correct.

The TR-45L Skinny

I love the Skinny as much as the original TR-45L—they sport the same receiver and audio; the Skinny simply lacks the ability to add an internal battery and Z-Match ATU. What you get, though, is a radio that’s even more portable and provides an excellent operating angle with the bail folded out.

Have you ever operated a Penntek radio during a contest or Field Day? What are your other favorite field radios for this type of environment? Please comment!

Field Radio Kits, Grab And Go, News, Portable, POTA, QRP, QRP Radios, SOTA

Deep Dive: My Mountain Topper MTR-3B Watertight SOTA Field Kit

5 Comments

Last week, in response to a reader’s question here on QRPer.com, I was reminded that I hadn’t yet made a video specifically about my Mountain Topper MTR-3B SOTA field kit.

Yesterday, I made a short video (see below) where I show what I pack in my MTR-3B field kit and why I choose to house it in a Pelican 1060 case.

First, let’s look at a list of the gear, then I’ll talk about what went into my choices, and I’ll link to the video.

Gear:

Note: All Amazon, CW Morse, ABR, Chelegance, eBay, and Radioddity links are affiliate links that support QRPer.com at no cost to you.

Self-Contained Watertight Field Kit:

Optional Gear for SOTA/POTA:

Design Choices

Here’s the philosophy behind my design choices in this kit:

Pelican 1060 Case

I chose to house this field kit in a Pelican 1060 Micro Case even though, at one pound, it weighs more than the typical pouch I also use for small field radios. The Pelican, however, protects the entire radio kit as it’s fully watertight and crush-proof. If I trip while fording a creek or fall and land on my pack, the Mountain Topper will be safe. Yes, there’s a mass/weight cost, but I feel it’s very minimal for the protection it offers.

Counterpoise-less End-Fed Half-Wave

When I build the K6ARK EFHW antenna kit for my MTR-3B, I chose to make it without a counterpoise. Even though the antenna would be more efficient with a dedicated counterpoise and less prone to the effects of body capacitance, I feel like the benefits of this design outweigh the compromises. For one thing, leaving off the counterpoise saves space inside the Pelican case. In addition, by designing the antenna to attach directly to the MTR-3B’s BNC port, there’s no need to include a feedline, thus saving quite a bit of space.

So far, I’ve been very impressed with how forgiving this antenna has been and, most importantly, with how well it has performed.

N6ARA SWR Meter

I include the N6ARA MiniSWR  in my field kit to give me some peace of mind if my antenna deployment is compromised (for example, if the trees on a summit are too small, etc.). Since my MTR-3B version has no built-in SWR metering, I feel this is a meaningful addition tot he kit.

Throw Line and Weight

At least 90% of the summits and parks I activate here in western North Carolina have trees. To me, no field kit is truly sufficient unless I include a throw line and weight. I find that the Marlow KF1050 Excel 2mm Throwline is small, lightweight, and effective—-25 meters is enough to deploy any wire antenna I’d carry on a SOTA activation.

Many SOTA ops use a small sack that they place stones in to act as a throw weight for their line. This is very clever because you don’t have to pack in that extra 8 ounces on the roundtrip hike. Still, I like the convenience of a throw weight that’s designed to glide through tree branches with ease–especially if the tree is dense. If I were to do a multi-day SOTA backpacking trip, I’d probably use an empty throw sack instead of a dedicated weight.

Rechargeable 9 Volt Battery Packs

I love these 9V rechargeable batteries. It’s hard to believe that the MTR-3B can complete 2-3 typically SOTA activations on one charge! Then again, the MTR-3B uses something like 18ma in receive? That’s crazy low current consumption. These batteries are super lightweight and the particular brand I use has never produced any RFI (I’ve read that some others can). What’s best is that I can recharge these easy via a USB-C cable.

The MTR-3B will operate on nine volts, which yields three watts of output power.

Helinox Chair and Kneeboard

Yes, these are luxury items. I know many SOTA ops who are quite happy to sit on the ground and balance their radio on their leg. Perhaps it’s my age, but I don’t like doing this anymore because my legs tend to fall asleep and I lose feeling in them if not careful.

My Helinox Zero chair weighs 1 lbs 2 oz (509 g). I feel like it’s weight and mass well-spent. Since I record activation videos, the chair also gives me a much better position for my camera angle (bonus!).

My Tufteln/N0RNM kneeboard is an essential part of my SOTA kit. I never leave without it. The chair and kneeboard combo gives me the flexibility to set up anywhere, anytime. I love it.

Video

Here’s a video showing the breakdown of my Mountain Topper MTR-3B SOTA field kit:

Click here to view on YouTube.

Thank you!

 

Thank you for reading my field kit post and watching the video! I hope you enjoyed it.

As always, I’d also like to send a special thanks to those of you who have been supporting the site and channel through Patreon, and the Coffee Fund. While not a requirement, as my content will always be free, I really appreciate the support.

If you’d like to see loads more field kits, check out our field radio kit gallery!

Thanks for spending part of your day with me!
Cheers & 72,
Thomas (K4SWL)

Field Reports, Guest Posts, Homebrew, News, Portable, POTA, QRP, QRP Radios, Travel

WN5C: Notes from a homebrew POTA adventure

18 Comments

Many thanks to Sam (WN5C) who shares the following guest post:

Notes from a homebrew POTA adventure

Sam (WN5C)

I recently wrote about the homebrew transceiver I built to operate on a month-long trip through the American Southwest. Upon arriving back in Oklahoma here’s the final outcome: 27 days, 40 parks, and 669 QSOs. I honestly can’t believe that the rig went the distance, or that I made so many contacts on 2 watts or less!

The priority of this trip wasn’t radio, though. I’m an archaeologist and I’m starting a new research project that marries my historical interests with my love of two-way communication. In short, I’m studying the effects of how communication technology aided the American colonization and transformation of the western United States around the turn of the twentieth century. This means I walked and mapped single-wire telephone lines strung up in pine trees in northern New Mexico (used to connect fire lookouts with Forest Service ranger stations), a fascinating story of dramatic changes in land management. I also visited heliograph (sun-mirror signaling) stations established in southeastern Arizona by the U.S. Army Signal Corps in 1886 to assist in apprehending Geronimo.

Working Fort Bowie NHS (US-0815) in Arizona. The peak in the distance, Helen’s Dome, had a heliograph station on top. From the fort telegraph lines would have connected remote operations to the rest of the Army’s 1880s communication network. Next time I’m climbing up on top!

I look forward to relocating and studying the artifacts from more of these heliograph sites (mostly on remote peaks) to reconstruct this communication network and understand the lives of both the soldiers and the Apache, and how this novel surveillance system altered the battlefield. Based on the artifacts I’ve seen so far there are many cans of Army-issued proto-Spam and beer bottles surrounding the signaling station where American Morse Code would have been sent and received via flashes of sunlight. The original Field Day?

But back to radio. I covered a lot of ground and activated parks in Oklahoma, Texas, New Mexico, Arizona, Utah, Colorado, and Kansas.

The POTA sites that I activated (click image to enlarge).

At some locations I was camping so I was able to do multiple long activations and work the lower bands well into the evening. These were some of my favorite moments of the trip, being the only spot on the POTA app and leisurely working with no time or weather-based worries. It also gave me a chance to hear callsigns I was unfamiliar with, essentially exploring a new area of the country.

Working closer states after hours on 30 and 40 meters at Colorado NM (US-0918).

For other times, due to time constraints or weather (thunderstorms or that it was unbearably hot), I got my 10 contacts and moved on. Sometimes I packed the equipment for a long hike, often carried it from the car to a picnic table, and a few times deployed my antenna and operated from my vehicle.

Not every activation was a grand adventure. Sometimes, like here at Rocky Mountain Arsenal NWR (US-0226) in Colorado, I worked from the passenger seat in the car.

Every activation was memorable in its own way. I worked folks from 44 states, five Canadian provinces, and an unforgettable contact from Italy.

A map of the contacts I made (not including those in northern British Columbia, Alaska, and Italy).

The radio held up surprisingly well. Aside from it looking like a Dalí painting as the 3D printed box continued to deform in the heat, and some hot glue remelting, the electronic components worked as they should. I look forward to printing a stronger case and making some upgrades going into the fall. I do now have a real respect for the engineering that goes into designing field radios, especially those that are thrown into a pack!

Setting up a portable shack on Vail Pass in the White River NF in Colorado (US-4410). This was near the end of the trip, the plastic case was looking pretty bad.

After I began feeling less anxious about the homebrew radio (it kept turning on!) I could start focusing on the trip itself: an amazing POTA adventure with an often-uncooperative sun. Here’s a few themes I noted. Continue reading WN5C: Notes from a homebrew POTA adventure →