All posts by Thomas Witherspoon

Antenna Tuners, Antennas, Field Radio Kits, Grab And Go, Portable, Portable Power

Brent’s updated review of the CQHam TB Box

8 Comments

Many thanks to Brent (VA3YG) who writes:

Hi Thomas, hope you’re well.

Just a short message to bring you up to date on the performance of the new equipment.

In a nutshell, it’s brought me back to my old faithful friend, the FT-817. I bought my FT-817 20 years ago and it’s served me flawlessly all these years. It’s not the best at everything but it’s a perfect QRP shack-in-the-box.

The TB Box makes the little Yaesu a pleasure to use. The tuner tunes my 43’ vertical and K6ARK end fed random wire from 80-10 for the vertical and 40-10 for the ef random wire.

The battery tray slips out to reveal 6 Panasonic 18650 cells. The battery life is exceptional even with the 817 set on 5 watts. I’m just now in the process of topping the batteries up.

Attached are a couple pics of my operating situation today….it was such a nice day out on the driveway. I have a telescopic pole attached to the RV and strung the 41’ of wire up. Also, a closeup of the battery tray and one of the cells.

I can whole heartedly recommend this piece of gear to supplement an FT-817/FT-817ND/FT-818ND.

Loving it!

72/73,
Brent VA3YG

Very cool! Thank you for sharing the update, Brent! I’ll admit that I like the “old school” simplicity of this power and trans match system.

Click here to check out the CQHam TB Box on eBay. (partner link)

Field Reports, Morse Code, News, POTA, QRP

POTA Fun: Pairing Mike’s “Oreo” Balun/EFHW with the Venus SW-3B

10 Comments

A few months ago, Mike (KE8PTX), contacted me with info regarding his latest 3D-printed creation: a compact housing for an end-fed half-wave balun.

Mike’s 3D drawing

He called it the “Oreo Balun.”

Once printed, and after he wound the coil and installed the BNC, he sent this photo:

It’s cute, isn’t it?

He then surprised me by putting it in a padded envelope and sending it to me as a gift. Wow–thanks, Mike!

Oreo plans

End-Fed Half-Wave antennas are popular portable antennas for a reason: they’re effective!

They’re compact, easy to deploy, and resonant.

I only needed to attach some wire to the Oreo Balun, trim it, and hit the field!

Earlier this year, my buddy Vlado and I built two doublets with some scrap wire I had in my antenna parts box.  I measured the amount of wire I had left from that same spool. I knew it wasn’t enough length for a 40 meter EFHW, but I did think there was enough for 30 meters.

After giving it a bit of thought, I liked the idea of having a dedicated 30 meter EFHW. For one thing, 30 meters is a great band for field deployments and in the past this band has saved my bacon when either 40 meters or 20 meters was wiped out. Thirty meters is also a refuge WARC band during contest weekends.  In addition, a 30 meter EFHW is short enough that it could be deployed on most SOTA summits (which often have shorter trees).

Fortunately, I had just enough wire for 30 meters. IN fact, after trimming the antenna, I only had about two feet of wire to spare. It’s as if I had planned it! I would have never guessed that spool of scrap wire would have made two doublets and one 30 meter EFHW.

The next logical thing to do was take the Oreo to the field and play radio! Continue reading POTA Fun: Pairing Mike’s “Oreo” Balun/EFHW with the Venus SW-3B →

New Products, News, Portable, Portable Power

Bruce discovers roWaves ROW-PDS-0X USB-C to 12V converter boards

9 Comments

Many thanks to QRPer contributor, Bruce, who writes:

Hi Thomas,

I have been on a several-year journey to get to the point where all my portable electronics can be powered or charged via USB or USB-C. Gone are the days when I would have to lug around multiple chargers (or lots of spare batteries) in my travels.

Unfortunately, radios have been the holdout. I know that some people have played with USB-to-12v converter boards, with varying levels of success. I recently came across these dongles sold by the Romanian company roWaves Technologies:

Click here to check it out.

I just received a DS-02 (for FT817) and a DS-04 (for IC-705). I can now charge my 2m HT and marine VHF handheld using a USB-C charger or battery pack. I can now charge/run my IC-705 at 12v from the same source.

I have yet to explore how much noise these adapters generate. Even if just used for charging, they’re a great addition to my travel kit.

Probably not SOTA gear, but a nice addition to any ham’s travelling kit.

Bruce

Wow! Thanks for the tip, Bruce! I love how compact these are and it’s certainly a huge bonus that they can charge the internal batteries on your rigs. That alone, as you say, is huge because it can cut down on the amount of accessories needed during radio travels.

Let us know how well this works for you over time, Bruce. I’m curious if others have tried this USB to 12V converters–please comment!

Click here to check it out at roWaves.

Antenna Tuners, Articles, Field Radio Kits, Grab And Go, Kits, News, Portable, QRP, QRP Radios

Leo’s complete QCX-mini field kit and ZM-4 manual tuner kit

4 Comments

Many thanks to Leo (DL2COM) who recently reached out after watching my livestream with Josh at HRCC on the topic of QRP/CW portable. 

Leo shared some photos of a complete radio kit he built around the QCX-mini along with a ZM-4 ATU kit he also recently built. Leo has kindly agreed to share these on QRPer.com.

Leo notes:

Attached is a photo of my ultra light kit.

It consists of a QCX-Mini 20m version (self-built), K6ARK EFHW, Palm Radio Pico Paddle, Eremit 2Ah LiFePo battery, headphones and a few cables.

I usually also carry a small arborist kit and if there is still room also the 6m mast from Sotabeams, depending on what I think will work best.

I chose a hard case and went for the Peli 1060 Micro. It has room for everything I need and it could easily hold a bit of RG316 coax in addition (even more if I chose to shorten the 30m arborist line).

The main benefit for me is that I really don’t have to worry at all about what’s inside – compared to a soft pouch. So I can just shove it into my backpack or glove box and forget about it since this configuration is a lot more rugged and water proof – while being slightly heavier. Continue reading Leo’s complete QCX-mini field kit and ZM-4 manual tuner kit →

Field Radio Kits, Field Reports, Morse Code, News, POTA, QRP, SOTA

SOTA: Breaking in the Venus SW-3B on Dogback Mountain & taking in Wisemans’ View!

19 Comments

When I take a new radio to the field, I often don’t know what to expect until I arrive at the site and put it on the air. It’s one thing to use a radio in the shack, and quite another to use it in the field.

Earlier this year, I purchased a Venus SW-3B, three band QRP transceiver after much poking and prodding from readers and subscribers.  I actually contacted Dale (BA4TB) at Venus and asked for a loaner to do a review, but he had no units set aside for loans, so instead offered me a coupon code. I was hesitant to purchase yet another QRP radio–which is why I asked for a loaner–but his coupon discounted the radio enough I could even afford to splurge for expedited shipping.  He made money and I didn’t have to worry about loan periods, etc. It turned out to be a win/win.

I knew I wanted the SW-3B’s maiden voyage to be a SOTA summit, but I had to wait for a good weather window.

On Thursday, February 10, 2022, I got that opportunity!

Dogback Mountain (W4C/EM-066)

I learned about Dogback Mountain from my buddy Dave (W4JL) who activated it earlier this year. He told me it was a drive-up summit and was high enough to even rack up winter bonus points.

Back on January 26, 2022–during my POTA RaDAR run–I tried to activate Dogback Mountain, but the forest service road was too icy in all of the wrong places. I made it to within three miles of the summit but stopped and performed an activation of Pisgah Game Land and Pisgah Forest instead.

The road had no ice on it February 10, although it was very muddy and slippery in spots. Made for a very enjoyable drive in the Subaru, although post-activation you would have never guessed I’d washed the car the day before!

I arrived on site and parked the car at a pull-off that was well within the activation zone of the summit.  Dave was right: this summit was very accessible (well, as long as your vehicle has a bit of clearance–this isn’t a road for sports cars or low sedans).

I walked up the short path to the true summit and was absolutely gobsmacked by the views of Linville Gorge, Table Rock, and Hawksbill Mountain. Continue reading SOTA: Breaking in the Venus SW-3B on Dogback Mountain & taking in Wisemans’ View! →

Field Radio Kits, News, QRP

Joe’s Penntek TR-35 weatherproof field kit

1 Comment

Many thanks to Joe (K0NEB) who writes writes:

I found this case at Harbor Freight [see above]. It adds weatherproofing and I put in a 3D printed key I make and cables and a pen and notepad for logging and copying CW.

73 de K0NEB
Joe Eisenberg

Here’s a link to this case at Harbor Freight; it seems to be their equivalent to the Pelican 1060 which is an ideal size for many compact QRP radios.

Thanks for the tip, Joe!

FYI: Joe is the kit building editor at CQ Magazine where you’ll find his many excellent articles. In fact, he’s featuring the TR-35 in his April column at CQ Magazine.

Antenna Tuners, Antennas, Field Radio Kits, News, QRP Radios

Brent’s initial impressions of the CQHAM TB-BOX

1 Comment

Many thanks to Brent (VA3YG) who writes:

Hello Thomas,

The Fedex courier just left my driveway. I ordered the CQHam TB box on Feb 29 and paid the $39 US for Expedited International shipping vs the Free Speedpack shipping from Hong Kong that promised it by June 1.  I really don’t like waiting for a parcel to arrive! Lol

I know there was some interest on your site about this product, so I thought I would write and give you some brief, first impressions.  Sadly,  I don’t have any more time to play with it until next week as I’m about to leave now to visit friends.

It arrived in 10 calendar days, well packed and everything inside survived the Fedex journey from Hong Kong to Southampton ON via Anchorage AK and Memphis TN.

No one would ever mistaken this equipment for gear made by Elecraft or Icom but it appears to work just fine. The variable capacitors are not smooth and the fit and finish is okay at best but I think, if you’re careful with it, and do your adjusting carefully, it should last you some time.

The “faux” leather case is actually quite nice and reminds me of the Yaesu FT-817 case.  As a bonus, a telescopic whip was included.

The batteries came charged and the rig showed 11.3vdc. I didn’t remove the battery tray as it didn’t want to slide out willingly and I didn’t want to force it. I’ll try that later when I have more time….

I connected my 43’ ZeroFive vertical with 30 radials to it and was able to tune from 80m right up to 10 meters with no problem.

I made a nice contact (my first phone contact in about 8 yrs) on 17 meters with a station in Biloxi.

It should be fun and it’ll give me an excuse to work the 817 again.

73 fer nw,
de Brent VA3YG

Thank you for sharing your initial impressions and the inside shots of the matching unit, Brent. We look forward to any updates you might provide as you spend more time with this field kit!

Field Radio Kits, News

Mark discovers an affordable case for the Penntek TR-35

3 Comments

Many thanks to Mark (W8EWH) who writes:

Hi Thomas,

I read with interest your posts about the PENNTEK TR-35 and liked it enough to go ahead and order one for myself. I built it over a couple of weekends of occasional work, and put it on the air. I really like it.

Since I’d like to take it out on some POTA activations, I did some investigation into a case and found the following case on Amazon:

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

 

This case fits the TR-35 very nicely. See the attached photos.

There is even room for a couple of cables to be tucked away under the mesh on the lid side. The only modification I made was to add a couple of pieces of packing foam around the top and BNC side to just keep the radio from sliding around a little. But really a person preference of mine.

I thought I’d share this with you so you can share with others that have this radio and are looking for a nice hard case.

Mark
W8EWH

What a great tip, Mark!  Looks like it fits the TR-35 perfectly. Thank you for sharing this!

Field Reports, Morse Code, News, POTA, QRP

A quick roadside activation with the Elecraft KX2 and CHA MPAS Lite

5 Comments

There are days when I leave the QTH and have no idea if I have enough time to fit in a park or summit activation. Because of this, I always keep a radio field kit in the car.

On Monday, January 31, 2022 I had an appointment-packed day ahead of me, but I was hopeful I might be able to squeeze in a quick activation of some sort.

Specifically, I had a new-to-me super easy, drive-up SOTA site in mind: Peach Knob (W4C/CM-097). In fact, it’s a bit odd that I hadn’t activated this site before. It must be the most accessible summit (to me) in the area.

After a 2:00 appointment in downtown Asheville, I drove 15 minutes to the summit of Peach Knob where I discovered 1.) there was almost no space to park and 2.) what little space there was was taken up with crews working on a cluster of communications towers. In situations like this, the last thing I want to do is get in the way; that sort of activator persistence could lead to “no trespassing” signs in the future.

The site also reminded me that what I love about SOTA is the hike to the summit. Sites like this one are wedged between private property and city property–I just feel like I’m in the way, arousing neighborhood suspicions, and just doing the activation for the points. I’m not a points guy (though I’ll do a happy dance when I accumulate 1000 for ‘Mountain Goat’ status sometime within a decade at this rate).

Moving forward, I think I’ll skip drive up sites like this one; at least for HF activations.

At this point, I pretty much abandoned the idea of a field activation as I’d taken up the wee bit of free time in my schedule just checking out Peach Knob.

Next, I popped by Vlado’s (N3CZ) QTH to drop off some parts so he could finish the repair of my Elecraft KX1.  While chatting with him, I received a message from our grocery store noting that our 4:00 curbside pickup would be delayed. This opened up a one hour window where I could perform an activation! Woo hoo! Continue reading A quick roadside activation with the Elecraft KX2 and CHA MPAS Lite →

Announcements, Hams, News

QRPer Notes: QSO Today Expo This Weekend, IC-705 Current Drain Explored, and DX Commander Channel Removed from YouTube

3 Comments

Because I receive so many tips from readers here on QRPer, I wanted way to share them in a concise newsletter format.  To that end, welcome to QRPer Notes, a collection of links to interesting stories and tips making waves in the world of radio!

QSO Today Ham Radio Expo, March 12-13, 2020

Many thanks to Vince (VE6LK) who reminds us:

QSO Today Ham Expo is THIS WEEKEND starting on Friday evening MT and early bird tickets are only $10 until the event opens Friday evening. Drop by through the weekend and find me in the Ham Radio Workbench Lounge in between presentations of course. Your entry fee gets you 30 days of video replay for those presentations you can’t see live.

Click here to visit the Ham Radio Expo and register!

KU3X Explores IC-705 Current Drain and Battery Packs

Many thanks to Barry (K3UX) who writes:

Thanks partially to your feedback, I purchase the IC-705 and I am one happy camper.

Icom states the current drain on receive for this radio is between 500 and 800 ma. So I tested the radio.

At 13.8 volts of supply voltage, the radio draws 200 ma on receive. What? At 12 volts the radio draws 225 ma on receive and at 11 volts, like off of a 3 cell LiPo battery the radio draws 250 ma.

When I made these tests, I removed the Icom clip on battery. Now going down to 8.4 volts, the radio draws 335 ma on receive.

So here’s the fly in the ointment: At 8.4 volts from the external supply, the radio would not transmit. It would not transmit at any voltage under 10 volts.

Conclusion….. there has to be a boost circuit built into the radio that goes between the battery and the radio. So to boost the battery voltage you will draw more current.

I posted my findings on my web page.

Thank you for sharing this, Barry! Funny enough, I’ve never thought to check current without the battery attached, but that makes sense. This would give us data knowing the radio isn’t using more current to recharge the battery pack at the same time. 

Typically, the lower the voltage, the higher the current drain and vice-versa. Also, I believe you’re correct in that there would be some extra consumption with the voltage booster in play. 

Thanks for sharing this!

DX Commander channel (temporarily?) removed from YouTube

A number of friends and readers have reached out to note that the DX Commander YouTube channel hosted by Callum (M0MCX) has been completely removed from YouTube. 

Callum’s channel is incredibly popular and this removal has everyone scratching their heads, so it’s no surprise there’s wild speculation floating around out there. Don’t fall into that rabbit hole.

I fully suspect that this is simply an error on Google/YouTube’s part and that his original channel will eventually be reinstated. 

In the meantime, Callum has started a second/backup channel where he’s posting content. Click here to check it out.

When his original channel is reinstated, you’ll find it here.