Category Archives: Accessories

Accessories, Antennas, Articles, Morse Code, News, QRP, Reviews

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

28 Comments

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! →

Accessories, Morse Code, News, POTA, Reviews, SOTA

N0SA SP4 Mini Morse Magnetic Paddles Review

28 Comments

You might recall my previous announcement about the new  N0SA SP4 POTA/SOTA Mini Morse Code Magnetic Paddle from CW Morse.

The first production run of these paddles sold out very quickly, but I just received the following message from CW Morse about the new paddles:

We’ve finally gotten caught up and will be shipping out Monday & Tuesday [Nov 21/22]! Also have a few more in stock. Making another batch as well.

CW Morse sent me a set of these paddles to evaluate at no charge to me (keep in mind, they’re both a sponsor and affiliate of QRPer.com) and I got a chance to use them Thursday afternoon.

In short?

I love these paddles!

In fact, I think these may become my preferred compact paddles.

I like the size of the finger pieces/pads.  They’re large for such a tiny paddle, which I believe gives them a solid feel while keying. I prefer a larger contact surface area as opposed to thin finger pieces.

The response is very precise, too, and the action can be adjusted by a supplied Allen wrench.

I agree with a few readers who’ve already received their paddles and noted that the carbon fiber reinforced PETG material make the key grippy and very easy to hold.

The size and design is very similar to the SOTA paddle N0SA sold out of last year in a matter of a few hours.

Bonus POTA Activation!

Thursday afternoon, my daughters attended a two hour meeting not even a stone’s throw from the Blue Ridge Parkway. I had *just* taken delivery of the new N0SA paddles, so grabbed the shipping box from CW Morse, my new-to-me Elecraft K2/10 (more on that later!), and my PackTenna Random Wire antenna.

I only discovered that my daughters’ meeting was so close to the parkway about 10 minutes before leaving the QTH. This was one of those bonus activations that deserved a little happy dance, especially since I could spend a good 1.5 hours on the air–a proper luxury for this busy father!

I’ll post a full field report and activation video in a couple of weeks, but in a nutshell, 30 meters was on fire. I’d planned to work 20, 30, and 40 meters (to test the K2’s internal ATU) but 30M was so dang busy, I never had time to QSY.

I had not put the K2/10 on the air yet, so all of the settings were default and it had been a few years since I used a K2, so had to re-familiarize myself with the settings. Thirty meters was so consistently busy, I didn’t have a breather to tinker with the settings.

The new N0SA SP4 paddles worked flawlessly.

I expected nothing less from an N0SA design, but still–the feel and action is superb.

I think this paddle may become the new benchmark for where price and quality meet.

I feel like CW Morse could be charging  $112.95 instead of $82.95 for these and I would still be very pleased with that price. I’m glad they’re not, though, because sub-$100 pricing does give new CW ops an affordable quality mini paddle option.

Based on so many reader recommendations, I purchased a BaMaKeY TP-III paddle recently. It’s also a wonderful paddle, but cost me 157.25 Euro which is nearly twice the price of the SP4 paddles. While I think the TP-III paddles are brilliant (and I’ll soon post a review) I actually prefer the N0SA SP4 paddles (note that this is my own personal preference–both are amazing keys). I prefer the SP4’s larger finger pieces.

Size comparison: CW Morse CNC Machined Aluminum Paddles (left) N0SA SP4 Paddles (right)

The great thing about CW Morse is that they have the capacity to handle customer demand of the SP4 paddles–this is something N0SA couldn’t do as a one-man show. I think CW Morse also has economies of scale working in their favor and, no doubt, this is how they continue to be the market leader in terms of quality for price.

If you’ve been looking for quality mini paddles for your compact field kit or shack, look no further. These are a no-brainer. You’ll love them.

Click here to check out the new N0SA SP4 SOTA/POTA paddles at CW Morse.

Accessories, News, Portable, QRP Radios

Sam sources a larger tuning knob option for the Penntek TR-35

3 Comments

Many thanks to Sam Duwe (WN5C) who writes:

John (AE5X) had suggested a while back finding a larger tuning knob for the Penntek TR-35.

I was striking out in finding one that fit but had to put in a Mouser order and thought I’d give this knob a shot (Mouser # 706-11K5013-KFNB) and I really like it!

I accidentally bought the gray version and had to paint it black. It’s shiny because of the clear coat and rough because of sanding and because I’m apparently awful at painting, but I find that it fits with the plastic bezel of the radio.

With the optical encoder it really glides, and totally changes the feel of the radio. Pretty good deal for $2.36.

Thank you for the tip, Sam!

Accessories, FT8, How To, News, QRP

How Joe keeps his Icom IC-705 cool during long FT8 sessions

6 Comments

Many thanks to Joe (KD2QBK) who writes:

Hi Thomas:

I’ve recently discovered QRP FT8, which I’ve been working with my Icom IC-705. I run with an end-fed sloper that runs out of my 2nd floor shack window using a 49:1 unun and a length of RG-58. I’m also using an Emtech ZM-2 tuner between the antenna and the radio when needed.

The set up works really nicely, except for the way FT8 heats up and overtaxes the radio after a while. Searching around a bit, I’ve found just the right solution for that issue. The AC Infinity MULTIFAN S1 USB-powered table fan.

https://amzn.to/3DvqemJ (affiliate link)

It’s basically just a 3-inch square fan like you’d find in a computer or some other electronic devices, with rubber “feet” attached. It can stand upright or lay flat depending on your need. it’s stated purpose is to cool or ventilate routers, game consoles, audio equipment, etc.

The AC Infinity MULTIFAN S1 includes a speed control switch and an inline USB socket to daisy-chain other devices. One caveat with the inline socket: because it’s placed in the line between the fan and the speed control switch, the switch must be set to high speed else the socket won’t have adequate power for the attached device.

All I do is plug the fan into a USB socket and place it at the rear of the radio, sans battery, to keep it cool. I have it set up to blow onto the radio. Obviously I need to power the radio with an external source when the battery isn’t attached. I’ve not tried to use the fan with the battery attached, but I don’t think it would help much. The ventilation slots next to the battery compartment don’t seem wide enough to let much air in. Continue reading How Joe keeps his Icom IC-705 cool during long FT8 sessions →

Accessories, News

Don adds an inexpensive clip-on LED lamp to his Icom IC-705

3 Comments

Many thanks to Don (W7SSB) who shares the following notes about a small LED book lamp he’s added to his IC-705 and Peovi cage:

This is a book lamp from Amazon that uses 3 AAA’s and costs $8.99.

It has 3 brightness settings and clips onto the Peovi cage.

It really brightens up the radio in a dark room.

Click here to check it out on Amazon (affiliate link).

Thank you for sharing this, Don!  That’s a clever use for that book lamp. I’ve often thought that all field radios ought to have a logging lamp on them like the KX1. This is a nice and inexpensive workaround!

Accessories, Antennas, News, Portable, POTA, QRP, QRP Radios, Videos

Taking the Mountain Topper MTR-4B on a quickie activation at South Mountains State Park!

2 Comments

The entire time I was in Canada this summer–about two months–I  used two field transceivers: the Elecraft KX2 and the Discovery TX-500.

I did sneak in two extra radios under the floor of my trunk/boot space, but they both were limited to three watts and conditions were so rough during many of my activations, I wanted the option of a QRP “Full Gallon” (5 watts). Thus, I stuck with the TX-500 and KX2 (which are both actually capable of 10 watts output).

When I got back to the States, I was eager to do a POTA activations with my other radios–many of you know I like to rotate them–but there was one, in particular, I was eager to put back on the air…

The Mountain Topper MTR-4B.

This MTR-4B V2 is on loan to me from a very generous reader/subscriber. In fact, get this: he ordered the MTR-4B early this year and had it drop-shipped to me directly from LnR Precision. He knew I’d be in Canada for the summer, so has been incredibly flexible with the loan period (basically leaving it open ended).

My review of the MTR-4B will be published in the November or December (2022) issue of The Spectrum Monitor magazine. Then I’ll be sending the MTR-4B to its rightful owner!

In the meantime, I built an ultra- compact field radio kit around the MTR-4B and in my Tom Bihn HLT2 EDC pouch.

This kit is nearly identical to the one I made for my MTR-3B (just a different color, really).

It contains the radio, a battery, an antenna (although I used a different one during this activation), fused power cord, paddles, earphones, RF choke, RG-316, logbook, pencil, and even a full throw line and weight. I’ve listed all of the components with links below.

It’s hard to believe it all fits in such a compact kit and it works so well. It’s nice to know that with the kit it in my backpack, I’ve got everything I need to play SOTA or POTA at the drop of a hat.

South Mountains State Park (K-2753)

On August 8, 2022, I drove to my hometown to check in on my parents. I didn’t have a lot of time, but I wanted to fit in a quick activation with the MTR-4B along the way.

One of the easiest parks for me to hit en route is the South Mountains State Park Clear Creek Access–it’s maybe a 10-15 minute detour off of Interstate 40.

The weather was amazing that day, although I’ll admit I had to get used to the heat and humidity after spending so much time in Canada this summer!

This access point of South Mountains only has one picnic table. I’m always prepared with a folding chair if that table is occupied, but so far it’s always been available. I’m sure the reason is because this particular South Mountains access point is way less popular than the main entrances. Most of the visitors here come to fish at the reservoir.

Setting up

The great thing about having your whole station in a pouch is that setup is quick and easy.

Continue reading Taking the Mountain Topper MTR-4B on a quickie activation at South Mountains State Park! →

Accessories, How To, News, Portable

Fold-out feet for the Penntek TR-35

10 Comments

I must thank my buddy John (AE5X) for this excellent tip.

I was watching one of his YouTube videos some time ago and noticed that he added fold-out feet to his Penntek TR-35.

Like John, I appreciate my radios sitting at a bit of an angle as I operate and these fold-out feet looked like the perfect addition to my TR-35.

These feet are designed for laptops which are much heavier than the TR-35 or pretty much any similar field radio.

They arrive in a small package with an alcohol wipe to clean the bottom of the radio. The adhesive pads on the feet are made by 3M and high quality. I doubt they’ll ever fail. Since they’re designed to allow airflow under a hot laptop, I believe the adhesive should withstand hot summer days in the field as well.

Continue reading Fold-out feet for the Penntek TR-35 →

Accessories, Articles, Hacks and Hints, How To, Morse Code, News

How to assemble a narrow CW filter for your Yaesu FT-817/FT-818/FT-857/FT-897 (an affordable YF-122C equivalent)

32 Comments

QRPer.com readers know that I’m a big fan of the venerable Yaesu FT-817 and FT-818 series transceiver.  So much so, I own two FT-817NDs–I purchased a second unit last year primarily for full duplex satellite work.

As I mentioned in a previous post, the one gotcha with the FT-817 and FT-818 is narrow CW filter availability. The YF-122C 500 Hz and YF-122CF 300 Hz Collins filter boards are no longer produced. Neither are the Inrad equivalents.

With the renaissance of CW we’re experiencing along with the growth of POTA, WWFF and SOTA, narrow CW filters for the FT-817/818 are very difficult to find and come at a premium when you do find them. I saw one sell recently for $250 US–over double what I paid two years ago.

In addition, this same filter not only fits the FT-817/818, but I believe it also fits the popular FT-857 and FT-897 series transceivers (please correct me if I’m wrong about this).

The Problem: I wanted another narrow CW filter

One of my FT-817NDs is loaded with a Collins 500 Hz mechanical filter that I purchased from my buddy Steve (WG0AT) nearly two years ago.

The second FT-817ND had a narrow Inrad 2 kHz SSB filter that came with the radio when I purchased it used (see image above).  Initially, I had no intention of buying yet another narrow CW filter because I’d only planned to use the second unit for FM and SSB satellite work.

Then, during field day this year, I decided it might be fun to build a quick-to-deploy portable HF station with something like an Armoloq TPA-817 pack frame. That thought experiment made me realize that I should simply bite the bullet and get a narrow CW filter for the second FT-817ND.

I started searching in late June and was simply not willing to pay the price for the very few filters that have shown up on the the used market.

The Solution? Assemble one!

I owe QRPer reader, Petr (OK1RP), for this tip.  Thank you, Petr!

The process of assembling your own narrow filter is actually quite simple and affordable. If you have even the most basic soldering skills, you’ll be able to manage this easy project. If interested, keep reading and I’ll show you how you can assemble your own…

Continue reading How to assemble a narrow CW filter for your Yaesu FT-817/FT-818/FT-857/FT-897 (an affordable YF-122C equivalent) →

Accessories, Antenna Tuners, Antennas, News, QRP

Joshua’s ATU-10 review update after new firmware upgrades

2 Comments

Many thanks to Joshua (KO4AWH) who shares the following update to his previous guest review of the ATU-10 automatic antenna tuner:

Update on the ATU-10: new firmware released

by Joshua (KO4AWH)

The short story is that David N7DDC has a Firmware update with a new tuning algorithm that seems to fix the previously seen failure to find a decent match. As noted earlier in comparison with the Elecraft T1, the ATU-10 still does not necessarily get as close a match to 1:1 SWR but it now does indeed find a good match making this tuner my go to for use with my IC-705.

Not previously mentioned, the ATU-10 is also designed to work with the IC-705 for tuning commands when connected with a TRS 3.5mm cable, not just as an auto tuner when given a signal. And, in practice it works just as it should. I actually took the IC-705 and the ATU-10 and worked a SOTA/POTA with the beta version of this new firmware. I ran a 35’ wire and it worked great allowing me to work 40m, 20m, 15m and 6m for a total of 26 contacts. As a followup to my previous testing with the prior firmware 1.4, below are my results with the current new 1.5 firmware.

Testing on August 20th, 2022

The only difference from the original testing is the 31.5’ radiator was replaced with a 35’ and I did not tune and record results with the T1.

Conclusion on the ATU-10

I now feel very comfortable recommending this ATU. newdiytech.com has a great price and the build quality seems just fine. With the new algorithm update, a good match is found. The ATU-10 works great stand alone and also works fully automatically when used with a IC-705. This configuration means you can put the ATU at the antenna feed point and run a control cable back to the IC-705 and have a 50 ohm across the coax to help minimize loss, making for a nice portable setup with great band hopping flexibility.

Of course, if interested, I sell a protection cover for the ATU-10 just as I do for the T1.

If your curiosity is strong, here is some testing I did for David as he was updating the Algorithm now used in firmware 1.5.

UPDATE August 3rd 2022:

David Fainitski N7DDC has released a test firmware with a new tuning Algorithm with some promising initial results. A quick test on each band in the table has been added to reflect the new algorithm. This is not a firmware update yet but I suspect it will be soon. Results are great as tested. I hope to see this in a new FW soon.

August 6th, 2022

A second test firmware from David Fainitski N7DDC with the ability to increase or decrease the L and C manually allowed me to verify if a better match could be made. Turns out in a few cases it could. After testing again with a Tufteln 9:1 T80-2X2 on a 41ft sloping radiator I was able to achieve much better results than with the current version 1.4. In two cases I was able to find a better match manually. I realized later that if I were to tune a second time the ATU-10 would find the same, better match, on its own. Again, not a full firmware update, i.e. you have to flash back to 1.4 if you want to be able to turn off the turner.

(Click to enlarge.)

August 7th, 2022

Another test firmware David asked me to check. This version seemed more likely to find the best match. I did have the ATU go to L0, C0 twice but then find a match on a second try. This happened once on 40m and once on 10m. Almost like it faulted but there was some switching/clicking involved before stopping, it just landed at a 3:1 or higher with 0 for L and C. A second tune however straightened it out. I did not record those two cases. Below are the results. I was able to find a slightly better match twice but I am sure one would never notice the difference during normal use. The improvement both times was within the error of SWR across the three device measurements.

(Click to enlarge.)
Accessories, Antennas, News, Portable

Arborist throw lines: Ideal lengths, weights, and packs for field radio

19 Comments

Many thanks to Barry (WD4MSM) who writes:

Thomas,

I thoroughly enjoy the website and movies!

Could you answer one question?

How much arborist throw line do you take into the field? 150’ – 100’ – less?

Thanks for taking the time to answer.

Barry WD4MSM

Great question, Barry!

I basically have four variations of throw line kits.

You’ve asked about line lengths, but I’m also asked frequently about the throw weight sizes and throw line bags as well.

First, let’s take a look at my kit variations, then I’ll share my thoughts on throw line lengths, weights, and bags. Note that many of these products are Amazon so there are affiliate links:

Throw Line with folding cube

One is my original Weaver throw line kit made up of two parts:

The line length is 150 feet (45.72 meters).

I tend to use this throw line when I’m doing a POTA activation very close to my vehicle. It’s lightweight, but a bit bulky to take on a long hike.

Compact Arborist Throw Line Kit

This kit is identical to my large folding cube kit above, but the throw weight is 12 oz and I store it in a small Weaver stuff sack.

Continue reading Arborist throw lines: Ideal lengths, weights, and packs for field radio →