Water Bottle and HT Holder

My XYL says I’m obsessed with bags, cases, and containers. She might be right.

During normal years, I participate in several public service events with my local ARES-RACES group. For a couple of those events, I’m often out on foot away from my truck with an HT. I wanted a convenient way to carry a few essentials for those situations. 

I put together this little kit last Winter, but it hasn’t seen much use. Sadly, the pandemic forced the cancellation of our public service events this year. This year has been anything but normal.

My water bottle carrier with HT pouch attached on the side
My water bottle carrier with HT pouch attached on the side

I wanted something to carry the following items:

  • Water bottle
  • HT
  • Spare battery for the HT
  • Small notepad and pencil
  • Minimal first aid kit (a few antiseptic wipes and bandages)
  • A few snacks

To carry everything, I bought a no-name water bottle carrier on eBay for about $13. I looked at lots of bottle carriers, but this inexpensive one was best suited to my needs. I’d provide a specific link, but these eBay offerings tend to quickly come and go. A search for “tactical military molle system water bottle bag” should should yield lots of options. I found some for less than $10. Of course, there are name brands out there that cost much more.

Here are the particulars of the one I bought:

  • The bag is constructed of 600D nylon. The specs say it’s waterproof, but I haven’t verified that.
  • The main compartment is 10.6″ tall and 4.3″ in diameter. It’s large enough to hold a 2-liter bottle. If I use a smaller water bottle, there’s room in this compartment for some other gear, too. It also has a zippered lid that will keep your gear from falling out.
  • There’s a 5.9″ x 4.3″ x 2″ gadget pouch on the front. This pouch is large enough for a couple of HT batteries, notepad, pencil, first aid kit, etc.
  • It has plenty of MOLLE webbing. A couple of them have Velcro for attaching patches. You could use the straps on the rear of the bag to attach it to another larger bag or your belt.

This bag certainly has room enough to carry everything I plan to carry in it. Heck, I’m sure I could carry a complete HF QRP station in it.

To hold my HT, I tried out several MOLLE-compatible pouches. The one I plan to use is a no-name item I bought from a Chinese seller on eBay. It only cost me about $4.00 (shipping included), but it works well with my current collection of HTs. I attached it to the side of the bottle carrier using the MOLLE webbing. An Internet search for “radio pouch” will bring you a dizzying assortment from which to choose.

As a final touch, I added a patch with my callsign on it. I ordered the 4″ x 1″ custom embroidered Velcro patch from a shop on Etsy. This little bit of vanity cost almost as much as the bag, but it looks good. 

So far, I’ve only used this bag for a few short hikes. I haven’t used this bag for its intended purpose yet, but I’m hoping that will change next year. (Fingers crossed)

73, Craig WB3GCK

Delving into D-Star

I mentioned in a previous post that I was going to venture into the digital voice modes. Well, I did. I was successful in getting a hotspot up and running, although I did hit a snag along the way.

Yeah, I know; as usual, I’m late to the party on this stuff. Up until now, I’ve had only limited experience with D-Star. Years ago, I used a borrowed Icom ID-1 for 1.2GHz data during a couple of ARES-RACES exercises. I hadn’t used D-Star again until I bought a Kenwood TH-D74A six months ago. Even then, I had only used D-Star to check into a local ARES-RACES net over a nearby D-Star repeater.

My local ARES-RACES group here in Chester County, PA, held one of our monthly Tech Rallies using Zoom. Jim WA3NOA gave an interesting talk on digital voice hotspots. Inspired by Jim’s talk, I went ahead and ordered an MMDVM hotspot from Amazon.

While waiting for the hotspot to arrive, I started studying up. I found lots of great articles and videos out there. W6GPS’s videos on the TH-D74 and D-Star were particularly helpful. Following one of his videos, I picked a hotspot frequency and programmed it into my radio.

The hotspot arrived a few days later. I was immediately struck how tiny this thing is. The instructions that came with it were sparse but clear enough to get started. I was able to successfully connect my laptop to the hotspot’s internal WiFi hotspot and access the Pi-Star configuration screens.

MMDVM Hotspot in use
MMDVM Hotspot in use

Long story short… Before too long, I had the hotspot connected to my home WiFi network and had the D-Star section configured. I keyed up my radio and received the expected D-Star response from the hotspot. Then, I tried to connect to some reflectors. No matter which one I tried, I got a “reflector is busy” message on my radio. Hmmm…

I sent screenshots of my hotspot configuration screens to Jim, but he didn’t see anything out of wack. I next focused on my WiFi router. I tried connecting the hotspot to other WiFi networks. No joy.

Finally, I went out and checked the status of my D-Star registration. That showed that my registration from way-back-when was missing a Terminal ID. An email exchange with WA3NOA confirmed that was likely my issue. My D-Star registration password no longer worked, so I reached out to Jim W3BIF, the admin for the W3EOC D-Star repeater.

My faulty D-Star registration. This turned out to be the cause of my hotspot problem.
My faulty D-Star registration. This turned out to be the cause of my hotspot problem.

The next morning I had an email from W3BIF saying he had straightened out my incomplete D-Star registration. Within minutes, I was connected to a reflector and having a QSO with a ham in Georgia. He reported that my audio sounded great. 

I used to be one of those guys who thought this stuff isn’t real ham radio. I guess I’ve come around a bit. I won’t be giving up CW any time soon, but I will admit it has been fun playing around with this new (to me)mode over the past week. 

Over time, I might branch out to try some other digital voice modes. In the meantime, you can often find me monitoring D-Star reflector, REF20A or REF30C. 

73, Craig WB3GCK

A Homebrew Z-Match Transmatch

[This is an updated version of an article that originally appeared on my QSL.NET website. Although it’s twenty years old, I still occasionally hear from people who have built similar tuners.]

Antenna tuners (more accurately referred to as “transmatches”) make great homebrew projects; they are reasonably simple to build and, when finished, provide a useful piece of equipment. Every shack should have (at least) one. I built this one a couple of decades ago, and it’s still in use.

WB3GCK Z-Match Tuner - front panel
WB3GCK Z-Match Tuner – front panel

For this project, I decided to try my hand at building a Z-Match tuner from scratch. This type of tuner has been around for a while. While the Z-match can take on several variations, what distinguishes it from other circuits is that it is a resonant circuit that uses a fixed inductor. 

WB3GCK Z-Match Tuner - rear panel
WB3GCK Z-Match Tuner – rear panel

Z-Match tuners became very popular within the QRP community years back, thanks primarily to articles in QRP journals by Charlie Lofgren W6JJZ and the emergence of Z-Match tuners in kit form. Emtech sold its wildly popular ZM-2 kit commercially and the NorCal QRP Club began selling their BLT tuner kit (a W6JJZ design) like hotcakes.

Some Pros and Cons

Why the popularity? Here are some advantages that the Z-match design offers:

  • Matches balanced loads without the use of lossy baluns.
  • Being a parallel resonant circuit, the Z-match can provide some band-pass filtering for your receiver and harmonic attenuation for your transmitter.
  • A well-designed Z-match tuner has a high Q and is more efficient (less lossy) than other types of tuners.
  • The fixed inductor simplifies construction (no taps or rollers needed).
  • Using a toroid inductor and some small poly-film variable capacitors, the Z-match can be built into a very compact package. This sort of thing usually appeals to QRPers.

There is, of course, no free lunch here. Here are some disadvantages of the Z-match design:

  • Tuning is usually very narrow and can be a bit touchy sometimes to tune up
  • The range of impedances that can be matched is not as great as in other designs, such as the “T” configuration.

Design and Construction

I make no claims of originality for anything in my version of the Z-match. I based it on a classic design which was first appeared in SPRAT #84 (see the G3YCC web site for a schematic of the original design). This design, by the way, is similar to the one used in the Emtech ZM-2.

I incorporated a few modifications in my version, based on an article by W6JJZ (“The Z-Match: An Update”, QRP Quarterly, July 1995, pp 10-11). First, instead of the T-200-2 toroid specified in the SPRAT article, I used a T-200-6 core. W6JJZ recommends the Type-6 core over the Type-2 because it provides a higher Q over most of the HF range. The number of turns has to be adjusted for the Type-6 core, due to differences in permeability. Here again, I went with W6JJZ’s suggested turns count. Another reason for choosing the T-200-6 core was that I happened to have one in my junk box. How convenient!

Z-Match Tuner Schematic
Z-Match Tuner Schematic

The coil was wound using some #22 solid hookup wire (from Radio Shack) which I had laying around. The secondary winding is wound between the turns of the primary to ensure tight coupling. I added a toggle switch to ground one side of the secondary winding to accommodate single-ended loads (like a random wire). A piece of styrofoam was glued to the bottom of the enclosure to provide some support for the toroid and to keep it away from metal surfaces.

WB3GCK Z-Match Tuner - Inside view
WB3GCK Z-Match Tuner – Inside view

Another W6JJZ modification I used was the inclusion of a DPDT (center off) toggle switch to provide some flexibility with the input capacitor. Using this switching arrangement, I can select between one section of the capacitor, both sections in parallel, or both sections in parallel with a fixed 470pF mica capacitor. The extra input capacitance can sometimes be helpful on the lower frequencies.

The capacitors are poly film variable capacitors (2 sections @ 365pF each), which were originally purchased from Mouser Electronics. Unfortunately, Mouser no longer carries them, and I don’t know of another commercial source. I should have purchased a truckload of them when they were available! Similar capacitors with smaller values are still available if you look around.

The SWR bridge I used is a Dan Tayloe LED SWR indicator from a kit that was offered years ago by the Arizona scQRPions. It uses a resistive bridge circuit with a single LED to indicate a null when the bridge is balanced. For the 50-ohm resistors in the bridge, I substituted 2 100-ohm, 1-watt resistors. The bridge will handle a typical 5-watt QRP rig without flinching and could probably handle a bit more than that.

SWR Bridge Schematic
SWR Bridge Schematic

The whole thing was packaged in an enclosure which measures 3 x 5 x 2 inches. It certainly could have been built into a smaller package, but I had this enclosure on hand and decided to put it to use.

On the Air

To use the Z-Match, adjust the capacitors for a null in the background noise in your transceiver. That will get you close to a match. Then, switch in the SWR bridge, apply some RF, and tweak the capacitors for minimum brightness on the LED. There may be some interaction between the two capacitors, so you might have to go back and forth between them a time or two.

For an initial test, I hooked it up to the famous—in my mind, at least—WB3GCK Downspout Antenna. The little Z-match loaded up the downspout on 40 through 10 meters with no problems. On most bands, I could get the LED indicator to go completely out. On one or two bands, I couldn’t get it completely extinguished but it did give a definite null. Double-checking with a second SWR bridge indicated that the SWR was 1.5:1 or less in this condition. While tuned up on 40 meters, I had a quick QSO with a station near Chicago from here in southeastern Pennsylvania with 3 watts.


This little Z-Match tuner was one of my favorite—and most useful—projects. It’s a great accessory for QRP rigs that lack an internal tuner or SWR meter.

73, Craig WB3GCK

©2000-2020 Craig A. LaBarge

Downspout Antenna Maintenance

Like many of you around the world, I’m under a stay-at-home order, due to the pandemic. Taking advantage of my new-found spare time, I decided to take care of some overdue antenna maintenance.

I’ve been using my rainspout as my main antenna at home since 1993. It’s a compromise antenna, but it has given me a way to get on the air from my real estate-challenged home. Normally, I do some routine maintenance on it annually, but I’ve been lax lately. It’s been about two years or more since I’ve cleaned up the connections. This was the perfect time to get caught up.

My normal maintenance routine is to re-do the connections at the downspout. The connections are subject to exposure to the elements on the outside and rainwater coming down the inside. The downspout is on a south-facing side of the house, so the sealant on the connections also takes a beating from the sun. 

Sometimes, my maintenance reminder is when I notice a change in antenna performance. Typically, it’s a change in the tuning. I might notice, for example, problems loading up on one or more bands. This time, it was an increase in noise levels. 

So, I headed out to the downspout and removed the screws I use to make the connection. I had to scrape off enough of the sealant I use to get a screwdriver in there. Next, I took some light sandpaper and sanded around the connection points. A few times over the years, I drilled new holes for the connections. This time, I just needed to clean things up a bit.

I use two ring lugs, jumpered together, to make the connections (see photo). My rationale is that two connections are better than one. If needed, I replace the ring lugs and the screws, but this time, they were still in good shape. I just cleaned them up a bit and reinstalled them. I finished up by resealing everything with a generous amount of Goop® sealant/adhesive

This is the connection to the downspout. Two ring terminals, jumpered together, are used to ensure a good connection. I used a liberal application of Goop sealant to weather-proof the connections. (A second coat was applied after this picture was taken.) You can see some holes from previous connections. (Note to Self: Do some touch up painting on the downspout!)
This is the connection to the downspout. Two ring terminals, jumpered together, are used to ensure a good connection. I used a liberal application of Goop sealant to weather-proof the connections. (A second coat was applied after this picture was taken.) You can see some holes from previous connections. (Note to Self: Do some touch up painting on the downspout!)

Next, I moved indoors and turned my attention to the ground connections. 

I have a 1/2-inch copper pipe that I use as a ground bus for my station. The pipe runs across the back of my radio desk to an incoming cold water pipe about 6 feet away. I use hose clamps and braided strap to make the connections to it. The 1:1 unun that feeds the wire out to the downspout is also grounded to the pipe with a braided strap and a hose clamp. The pipe itself is connected to the incoming water pipe with hose clamps and a short braided strap.

I couldn’t remember the last time I cleaned up these connections, so, it was time to get busy. I removed the connections to the copper pipe ground bus and cleaned up the pipe with light sandpaper and steel wool. I reinstalled everything, making sure the connections were tight.

Turning on my transceiver, I was pleasantly surprised with the fruits of my efforts. My local noise levels have always been high, and 40M has been the worst lately. The noise was S5 or S6 at times, but now it was down to S1 or S2. The noise on 80M was also an S unit or two lower. 

One of the ground connections at the operating position. The braid strap goes to the ground terminal on my 1:1 unun. The other end of the copper pipe ground bus uses hose clamps and a short piece of braid to connect to the cold water pipe coming into the house.
One of the ground connections at the operating position. The braid strap goes to the ground terminal on my 1:1 unun. The other end of the copper pipe ground bus uses hose clamps and a short piece of braid to connect to the cold water pipe coming into the house.

I wish I had taken care of this maintenance sooner. Next time, I’ll try not to procrastinate.

Stay safe in these difficult times. I’ll see you on the air.

73, Craig WB3GCK

Doublets I Have Known and Loved

In a recent post, I covered some (very) basic information about the venerable doublet antenna. This time around, I’ll cover some practical examples. These are antennas I have used and one unique design I know of.

Doublet Fed with TV Twinlead

My go-to portable antenna for several years was a simple doublet fed with 25 feet of that cheap, brown TV twin-lead. For the radiating elements, I used some #22 stranded hookup wire.

I first built the antenna as a 40M dipole fed with RG-174 coax. After a while, I wanted to cover multiple bands, so I removed the coax and replaced it with the twin-lead. I used a small piece of fiberglass perf board for the center insulator.

I have often used my homebrew Z-match tuner to load it up, although a 4:1 balun and a short run of coax to my rig’s internal tuner works fine, too. The whole antenna weighs next to nothing, and fits in a sandwich-sized Ziplock® bag.

Nothing fancy but it works great.

This is the center connector for my 66-foot doublet. The feedline is the old, cheap TV twin-lead.
This is the center connector for my 66-foot doublet. The feedline is the old, cheap TV twin-lead.

Up and Outer

The Up and Outer is simply a doublet with one vertical leg and one horizontal leg. I had done some experimenting with this old-time antenna and decided to build one to use while on vacation in the Outer Banks of North Carolina. 

I planned to support the vertical leg with a 28-foot Jackite pole, so I made a simple modification to a 44-foot doublet I had on the shelf. I spliced 6 feet of additional wire to each of the elements down to 28 feet each, and I was in business. Like my 40M doublet, the Up and Outer is fed with TV twin-lead and uses a perf board center insulator.

This antenna always goes with me on our annual Outer Banks vacation. I’ve used it from numerous beach rental houses, and it’s perfect for use on a second story deck. I used it last summer with great results, connecting it directly to my KX3. And, if I need to, I can use it as a normal horizontal doublet.

Appalachian Trail (AT) Dipole

This design is the brainchild of my friend, Ed Breneiser WA3WSJ, and goes back about 20 years. Rich Arland K7SZ, wrote about it in his QRP column in QST [1] back in 2001 and devoted a few pages to it in one of his books [2].

In simplest terms, it’s a 40M doublet made from #26 copper-clad stealth wire. Ed used a 3/4-inch PVC end cap for the center insulator (see photo). After soldering wires to an SO-239 socket and routing the wires through the end cap, the inside of the end cap is potted with epoxy. This makes it pretty much bomb-proof. 

The antenna is fed with 300-ohm ladder line, which is soldered to a PL-259 UHF connector. The PL-259 probably causes a slight imbalance, but in the field, you’ll never notice it. You can also feed it with coax and use it as a normal 40M dipole. Pretty cool, huh? 

When I built mine, I went with some #22 stranded hookup wire I had on hand. Although I departed from Ed’s design a bit, this doublet has been a reliable portable antenna over the years. 

My version of the WA3WSJ AT Dipole. The discoloration on the PVC end cap is from a mishap I had while potting it with epoxy. On the right is a PL-259 connector used with 300-ohm ladder line. As you can probably tell, this antenna has seen years of heavy use.
My version of the WA3WSJ AT Dipole. The discoloration on the PVC end cap is from a mishap I had while potting it with epoxy. On the right is a PL-259 connector used with 300-ohm ladder line. As you can probably tell, this antenna has seen years of heavy use.

WV0H Park Doublet

Myron WV0H designed a unique doublet that he dubbed The WVØH Park Portable DoubletHe uses two 50-foot pieces of wire to create a 60-foot doublet fed with a built-in open-wire feeder. I won’t attempt to offer a detailed description here; Myron’s blog post provides all the details you need to build one. Go check it out.

While I’ve never used Myron’s unique antenna, I can vouch that it works. I worked Myron a few years back while he was out in a park with his doublet. I can attest that it puts out a great QRP signal.


Well, that’s about it. If you need a reliable, easy-to-build, multi-band antenna, give the time-tested doublet a try.

73, Craig WB3GCK

[1] Arland, R. (2001, July). QRP Power – Antenna Time. QST, p. 100.
[2] Arland, Richard K7SZ, Low Power Communication – The Art and Science of QRP, The American Radio Relay League, 2nd Edition, 2004, Chapter 6, pp. 6-36, 6-37

The Doublet – Revisiting a Classic Antenna

I was recently going through my stash of portable wire antennas and came across one of my old favorites—the doublet. I don’t see too many references to this type of antenna these days, but the doublet provides a great portable antenna option.

What is it?

The doublet, simply put, is just a dipole. The difference is that you feed it with a balanced feeder, rather than coax. 

Hams have been using doublets for many years. The earliest reference I could find in the ARRL QST archives was from September of 1929.[1] In this write-up, Clair Foster W6HM describes a 40M doublet fed with twisted wire lamp cord used for receiving. 

Advantages of the Doublet

The balanced feeder provides some advantages. Depending on how it’s constructed, it can withstand higher SWR with lower losses than coax. Because of the low losses at high SWR, you can use the doublet as a multi-band antenna. 

As a portable antenna, it’s hard to beat, especially as an inverted vee. Use a tree branch or telescopic pole to hoist up the center, tie off the ends, and you’re in business. [2]

Some Disadvantages

This multi-band capability comes with some disadvantages, though. Fortunately, none of them are insurmountable.

First, you’ll need a transmatch that can handle balanced feedlines. Typical commercially-available feedlines have either 300 or 450-ohm characteristic impedances. For open-wire feedlines, the impedance can sometimes be 600 ohms or more.  

I’ve had success using a homebrew Z-match tuner. Companies like Pacific Antenna and QRP Guys sell Z-match tuner kits that will handle balanced lines. They offer tuners that are small and light enough for QRP-portable use. 

You can also use a balun to transition from the balanced feedline to 50-ohm coax. While this isn’t an optimum approach, it works. Textbooks often recommend a 4:1 balun, and that’s a good starting point. If you go this route, I recommend keeping the coax as short as practical. If you run into matching problems on some bands, try another balun ratio (e.g., 1:1), or change the length of your feedline. 

The second drawback is that you need to be careful of how you route balanced lines. You need to avoid getting it too close to metal or laying it on the ground. Both can upset the line’s balance. This can cause it to radiate or introduce losses. If you have excess line, don’t coil it up. Operating outdoors, I found these restrictions aren’t very difficult to work around; you just need to be mindful of them. 


Building the doublet is pretty simple. Many folks suggest making the doublet a half-wavelength long at the lowest band you intend to use. I’ve built one for 40M and it worked well on 40M and higher. Depending on your tuner, it may also be usable on the next lower band.

L. B. Cebik W4RNL (SK) popularized the 44-foot doublet for 40M-10M. According to Cebik’s analysis, this length produces a more consistent radiation pattern across the bands. 

Doublet diagram. One rule-of-thumb suggests avoiding combinations of feedline electrical length (L1) and one leg of the radiator (L2) that are odd multiples of an eighth-wavelength.
Doublet diagram. One rule-of-thumb suggests avoiding combinations of feedline electrical length (L1) and one leg of the radiator (L2) that are odd multiples of an eighth-wavelength.

Regardless of the size of the doublet, you should try to avoid certain feedline lengths. One rule-of-thumb suggests avoiding combinations of feedline electrical length plus one leg of the radiator that are odd multiples of an eighth-wavelength. [3] If you run into matching problems, you can try adjusting the length of either the feedline or the radiating elements.

Feedline Options

You have several options here:

  • Commercial 450-ohm or 300-ohm ladder line. These are commonly available, and they work great. 
  • Homebrew open-wire feeders. This is the most efficient option. If you do some Internet searching, you’re likely to find lots of ways to build open-wire feeders. SOTABEAMS has a great example on their website.
  • TV twin-lead. I’ve used the cheap, brown stuff quite a bit for portable doublets. Unfortunately, it’s nearly impossible to find these days. If you come across it somewhere, stock up!
  • Lamp cord or speaker wire. This works and I’ve seen folks use it for portable antennas. However, it can be lossy, compared to window line or open-wire feeders.

More Later

If you want more technical details on this antenna, information abounds on the Internet and in antenna books. In particular, Cebik wrote some great articles that are worth searching for. 

In a future post, I’ll cover some practical examples that I have come across or used in the field.

73, Craig WB3GCK

[1] Foster, C. W6HM (1929, September). Experimenters’ Corner: The “Doublet” for Receiving. QST, p. 39.
[2] DeMaw, D. W1FB (1991). Technical Bits & Pieces. In W1FB’s QRP Notebook (2nd Ed., pp. 157–161). Newington, CT: QST.
[3] Heys, John D., G3BDQ (1989). Center-fed antennas using tuned feedlines. In Practical Wire Antennas. Bedford, UK: Radio Society of Great Britain, p 7.

No-Name CW Paddles

Once a day, I receive an email from eBay showing the latest listings for CW keys. In one of those emails, a small and inexpensive set of 3D-printed paddles caught grabbed my attention. My curiosity got the better of me, and I ordered some.

The primary reason for my interest was the size. I normally use Palm Mini paddles attached to a clipboard, when I’m out operating portable. The eBay listing offered paddles that were a bit smaller than my Palm Mini paddles. The Palm paddles are no longer available (much to my chagrin), so I was curious if these cheap paddles might be a viable alternative. Given the low price (around $15, shipping included), I had no delusions that the no-name paddles would be as good, though.

The paddles are “unbranded” and listed on eBay under the awkward title, “Cw key automatic key short wave automatic key double paddle radio report NEW.” There are numerous listings for these paddles. Most of them ship from Hong Kong but there are some U.S.-based sources. Some are available in kit form.

They are available in 3 sizes. The two larger paddles have magnetic bases. I bought the smallest one (3x8x2 cm), which had the potential to work with my clipboard setup. They are intended for two-handed operation but I figured I could improvise some sort of magnetic base for them.  

Unbranded, 3D-printed paddles from eBay. The screw (one on each side) adjusts the paddle contact spacing.
Unbranded, 3D-printed paddles from eBay. The screw (one on each side) adjusts the paddle contact spacing.

As mentioned earlier, they are 3D-printed. The seller cautions: “Can’t work in high temperature environment!” The term, “high temperature,” is undefined. I’m sure I would start to wilt in the heat long before the paddles.

It took a couple of weeks to receive my paddles from Hong Kong. Besides the paddles, the package contained a 3-foot patch cable with 3.5mm stereo plugs. There was no documentation but none was needed. 

Read view of the small, un-branded, 3D-printed paddles from eBay. The rear connector is a standard 1/8-inch stereo jack.
Read view of the small, un-branded, 3D-printed paddles from eBay. The rear connector is a standard 1/8-inch stereo jack.

Out of the box, I found the contact spacing to be much wider than I’m accustomed to. Fortunately, the paddles have access holes on each side to adjust the spacing. A few tweaks with a Phillips screwdriver got the spacing closer to my liking.  

It was easy to fashion a magnetic base. Using some two-sided foam mounting tape, I added two strong magnets to the bottom of the paddles. The magnets didn’t line up exactly with the washers on my clipboard but they held pretty well. 

You’re probably wondering how they work. Well, they are about what you’d expect from $15 paddles. For sure, they lack the solid, precise feel of my more expensive Palm paddles. The paddle arms have what I call, “vertical slop.” By that I mean you can wiggle them up and down. Also, the paddles’ contacts aren’t the greatest. They are just the threaded ends of two machine screws contacting the threads of a vertically-mounted machine screw. 

With the “vertical slop” and the rough contacts, you don’t always get clean contact closure. To me, it feels like the contacts sometimes “scratch” when they close. The left paddle also sticks occasionally. At higher speeds (20+WPM), they can be challenging. That said, I am able to coax decent-sounding code out of them at moderate speeds—if I’m careful.

As they say, you get what you pay for. These paddles won’t be replacing my Palm Mini paddles anytime soon. They don’t have the smooth, quality feel of my Palm paddles—or any other paddles I own. Not by a long shot. I concede, however, that comparing these $15 paddles to more expensive products is not entirely fair.

CW keys and paddles are always subject to personal preferences; however, if you are on a limited budget, these paddles might work for you. It certainly won’t cost you a lot to find out. 

73, Craig WB3GCK

[Disclaimer: I have no financial interest in these products whatsoever.]

The K0MBT Mini-Mini Key

OK, I admit it. I have a fascination with tiny straight keys and paddles. With the proliferation of 3D printers, there are a lot of neat, innovative products available these days. This unusual little key from Dave Balfour KØMBT is a good example. [Update 3/16/2020: Dave recently changed his callsign to ADØB.]

Dave got started in 3D printing as a hobby a few years ago. A while back, he started sharing his straight key designs with his fellow SKCC members on the SKCC mailing list. That generated some interest and, before long, Dave was offering his keys for sale. As of this writing, Dave is offering straight keys in two sizes and a single lever paddle that can be used as a sideswiper (aka cootie) key.

I ordered the smaller of Dave’s straight keys, which he calls the “Mini-Mini.” Dave promptly shipped one and I had it a few days later. When I opened the box, I was immediately intrigued by this little key.

K0MBT "Mini-Mini" Key
K0MBT “Mini-Mini” Key

When I say “little,” I mean “little.” Overall, it measures approximately 2-1/4″ L x 1″ W x 3/4″ H and weighs in at a minuscule 0.7 oz. (19g). Instead of a traditional knob, Dave uses a novel indentation on the keying lever. The other unique thing is the switch he uses instead of the contacts. A little computer mouse switch provides both the contact closure as well as the return spring. As a result, there are no adjustments for contact spacing or tension. It doesn’t get much simpler than this.

On the rear of the key, there are two terminals for connecting the wires of your choice. There are holes on each side of the key, that meet at the two terminals. You can route your wires in from the side, providing a little strain relief.

Rear view of the K0MBT "Mini-Mini" key
Rear view of the K0MBT “Mini-Mini” key

When I first grasped the key, my forefinger instinctively went into the indentation and it felt very natural. Despite the lack of adjustments, the key has a nice feel to it. With it just sitting on my desk, I can send code without the key sliding around too much. With the cable I’m using, though, it can sometimes feel like “the tail wagging the dog.” It’s not a huge issue, as long as I’m careful.

Kudos to Dave KØMBT for this unique and fun little key. If you’d like more information on Dave’s keys, look him up on QRZ.com or download Dave’s PDF file describing his offerings.

73, Craig WB3GCK

[Disclaimer: I have no financial interest in this product whatsoever.]

Westclox Canadian Military Key

While puttering around the shack this morning, I came across an old key I had all but forgotten. It’s a Westclox Canadian military key that I acquired back when I was first licensed. It has been tucked away in the back of my desk drawer for most of the past 44 years. I can’t remember ever using it on the air, so I figured it’s time to give it a fresh look.

Westclox Canadian military key. According to the original box, it was manufactured in May 1949.
Westclox Canadian military key. According to the original box, it was manufactured in May 1949.

It seems like I’ve had this Westclox key forever. I remember buying it from a mail-order military surplus house around 1975. It was in excellent condition and appeared to be unused. The label on the box reads: Z1 ZA/CAN 0977. The box also shows a manufacturing date of May 1949. An identical key is shown on the W1TP website. The PA3EGH website also shows some similar keys.

Original box for the Westclox Canadian military key. The label reads Z-1 ZA/CAN 0977 and shows a date of May 1949.
Original box for the Westclox Canadian military key.

I don’t remember what I paid for it, but it wasn’t very expensive. I took a quick look at eBay this morning and I saw these keys listed anywhere from $80 to an outrageous $750.

One of the reasons it hasn’t seen much use is its “feel.” Unlike the J-38 style keys I used in the Navy, the contacts on the Westclox key are behind the fulcrum. This results in a “feel” that was a bit unusual to my taste.

The other issue with this key is that it’s somewhat loud. At one time I considered using it for portable operating while camping. However, I don’t think it would be a good choice for early morning operating when others are still sleeping.

Having said all that, there’s still something about this key that fascinates me. I spent some time re-adjusting it and it now feels better than I remembered. I also mounted it on a wooden base for some additional stability.

Frankly, I don’t think I gave this key a fair shake back when I bought it. So, I think I’m going to put this 70-year-old key on the air this week. If it really was new/unused when I bought it, this will be the first operational use in its 70-year existence.

73, Craig WB3GCK

A Slippery Sloper

I spent the weekend with my grandkids out near Harrisburg, Pennsylvania. My XYL and I watched the kids while my daughter and son-in-law took a little anniversary get-away. Of course, there was some time for ham radio, too.

By the time I got around to setting up an antenna on Friday, it was dark and the temperature was well below freezing. Oh yeah, there was about 4 inches of snow in the backyard to boot. So, I was in need of a real quick and dirty antenna.

I decided to toss a 29.5-foot wire out of a 2nd-floor window. I then went out to the backyard to secure the other end of the wire. I used some shock cord to tie it off to the top of a 6-foot wooden fence. My total time outside in the cold and dark was about a minute.

Back inside, I fed the wire through a homebrew 9:1 UNUN with 18 feet of RG-8X coax. This particular wire and UNUN served me well as a vertical during many National Parks on the Air (NPOTA) activations. I commandeered one end of the dining room table for my KX3 and powered up for a test. The KX3 was able to get a match on 80M through 10M.  Then, I went back to hanging out with the kids.

My impromptu sloper's feedpoint. The wire from the 9:1 UNUN is just pinched in the window.
My impromptu sloper’s feedpoint. The wire from the 9:1 UNUN is just pinched in the window.

By now I’m sure you’re wondering where the “slippery” part of the this post’s title comes in. Well, the next morning I looked out the window and saw that some ice had accumulated on the wire. The wire was dragged through the snow during installation and it froze overnight. The KX3 didn’t mind at all; the internal tuner loaded up the frozen wire without problems.

I got on the air for a bit on Saturday afternoon.  On the air, my impromptu antenna far exceeded my low expectations. I started off working N2CX on 40M. Joe was activating a park on the Eastern Shore of Maryland. I followed that up with a nice two-way QRP chat with WK2J in North Carolina.

My dining room table set up.
My dining room table set up.

I worked a couple of QRPers in the FYBO contest sponsored by the Arizona ScQRPions. I also worked some Minnesota and Vermont QSO Party contesters. An assortment of SKCC, POTA, and SOTA stations also made it into my log over the weekend. The best “DX” of the weekend was VE7ST in the British Columbia QSO Party on 20M.

I didn’t expect much from this quickie antenna configuration but I was happy with the way it got out. Plus, set up/tear-down was easy and only took a few minutes. This sloper will likely be my go-to antenna for future visits to see the Harrisburg grandkids.

72, Craig WB3GCK