WSPR Fun/Radio Woes

 My shack is an evolving mess. 

I've got several things going on, and plans for the future.

One of these plans involves taking my QRPLabs radios to the field. I have 2 QCX+ radios assembled, one for 40m one for 20m, both are relatively unmodified. The 40m one has a TCXO module installed to help with frequency stability. I have a TCXO for the 20m radio as well. In addition, I have an unmodified (yet)  QDX that I'm working on. I have a bad habit of blowing finals in this radio after about 20 contacts or so, not sure if it's the finnicky nature of the BS-170 finals due to over voltage from my "12v" gel cell battery (measures about 12.8 fully charged), or the finnicky nature of the BS-170 finals due to mismatched swr, even if just a teeeeeny bit. I'm considering a couple mods, one of which is to double up on the BS-170s. the idea being that the strange voltages are better handled  by 8 transistors than 4. People using the QMX series of radios especially seem to like this mod. Another involves installing a diode across L14 to help suppress transient voltages generated during the transmission cycle. Me, I'm thinking of taking my 8xAA battery holder, removing one of the AA batteries, and replacing it with a wire. Should keep me below 12 volts. QDX doesn't do too bad on the current draw department, but it is finnicky when it comes to those finals! The best idea may be to implement Barb, WB2CBA's solution, and just change the final transistor scheme all together. I can solder SMT stuff.... 

All of this is so that I can finally activate a Parks On The Air (POTA) station. My plan is to take  the QCX twins and the QDX to the field, activate a park, and work on fine tuning a station from that. I got a buddy from Church who's also a ham, and who also wants to try POTA in the field too. He's also a boy scout troop leader, and wants to tie that in as well. 

Once I know what I'm doing in the field, I'll get a QMX+ for POTA/general use. I'd even consider selling all my other radios to get it. SSB/CW/DIGI all in one radio, and it's a kit to boot!! Also, I'm waiting for Hans to decide to start shipping them with the 8 BS-170 finals, as opposed to the 4 (please?). 

I did use the QCX twins on WSPR over night, produced some excellent results:

20m WSPR Reports from EL98aa

40m WSPR Reports from EL98aa

I used my QLG-2 GPS satellite receiver to keep my QCX+ 20 in sync with the time. Both stations were set to run from about 11:30 PM local time to 8AM local time (2026-02-07 04:30 to 13:00 UTC). After 8 hours of operation, the QCX+ 40 was ahead of the time disciplined QCX+ 20 by about 8 seconds. Here's a picture, right before I halted operations 40's on the bottom, 20's on the top:

QCX+ 40 Lives IN THE FUTURE!

So I guess I'll need to figure out how to get two wires from the QLG-2 to the radios to sync the time.

Speaking of the QLG-2, it's a neat bit of cheap kit! I did make one mistake though, and soldered the header connector for the LCD display on the wrong side of the board. After asking the QRP Labs Group.IO guys, I figured out how to desolder the header and reset on the correct side. now it's good to go! Just need to figure out a case for it so i can pack it in the POTA station. 

Anyway,

ham radio priority 1 is a POTA activation.

ham radio priority 2 is to repair my Kenwood TS-140s station, starting with the Power Supply. My high power power supply is broken, and it looks like it's beyond me as far as fixing it goes right now. It pops fuses. I think that means something is wrong with the huge MOSFETS attached to the back or maybe it's as simple as a failed MOV. Not sure, and I don't think i have all the tools i need to check it out to fix anyway. I'll probably just buy a new Power supply, because I need stable 13.8 volts at 20Amps for my base radios at minimum. Once I have power again, I'll  need to replace all the electrolytic capacitors in my TS-140s. It's a great radio, but it's gotten squirrely on me. All indications indicate it needs new capacitors. And a new memory battery. Both of those are easy, if tedious fixes. Battery may be the hardest things to fix, it's a CR2025, but the OEM replacement needs two thick wires tack welded directly to the battery, which then gets soldered onto the board. I don't think i need to do all that, I mean, I can buy a replacement off ebay fairly inexpensively. Old solder can be stubborn though... Someone please buy me some chipquik solder to help these stubborn old joints flow.

I have other ham radio plans too, but until these two priorities are met, Everything else is on the way back burner.

More QDX Progress, More QCX Spots, and Repairs.

 

After solving my no spots problem by hooking the antenna in the right place, I moved on to further experiments, in anticipation of having a GPS to hook into the radios. I decided to run the QCX+20 and QCX+40 to their respective antennas, and see if i could get spots on both systems.

It worked!

KG4GVL, that's me!. I decided to shut down after about 24hrs of operation and continue work on the QDX. I installed more iron donuts, until I only had one left to do. It's a trifilar (three wires tightly wrapped together) transformer. More about that below... Then I reviewed the alignment and operation procedures. I need to decide what computer to run with it. I'll probably start with my home laptop, just to get it working, aligned, and post some QSOs with RTTY, maybe even try some FT-8 and FT-4. Eventually, I'll have this in my POTA station, paired with a raspberry PI for logging and operations. 

In the mean time, I've got some cleaning up to do in the shack. I just got a package from QRP Labs with some excellent goodies inside:

• a GLG2 GPS receiver for the QCX boys
• a couple TCXO boards for my 20m and unassembled 40m rig
• a couple volume Pots. Notice the missing volume knob on the top radio in the vid above? it went bad, and the one in my unassembled kit came broke in transit.

I've started assembling the GLG2, had some minor setback getting an SMA connector on the board, but i have a plan for that.

I also decided to just finish the QDX. There was so little work left on it. I got it done, then after making sure it didn't blow up with power applied, I brought it inside. It sat around a day or two, then I decided to figure out if it worked. I got a battery pack of AA batteries, and hooked it up. It turned on, and after downloading WSJT-X for Windows, I got the radio connected, hooked up to a dummy load, and listening around. It works!

I even have proof:

This screenshot shows WSJT-X with my QDX hooked up, decoding myself! It was a rush to receive my signal. I'm transmitting with my QCX+ in the shack, and here I am at the kitchen table, hearing myself with a dummy load!

Perfect.

Now on to more ham radio shenanigans.

QDX Progress, Tuning with Nano VNA, and You're Never Too Broke to Pay Attention

A few related experimental thoughts....

Improving the performance of my QCX+ on 40m in WSPR beacon mode is a goal of mine. Over the past month, you've seen the blog posts here. I started by doing a simple tune up of my antenna (or so I thought), then transmitting during a time when propagation was expected to be poor due to a geomagnetic storm. I got the expected poor performance.

The next evening, i changed nothing and turned the radio on. I started getting better spots, but nothing amazing.

The third night I ran the experiment, I got my Nano VNA out and spent about 20 minutes tweaking the controls on the MFJ-941E to get the best match  possible.

 I should have realized something was up, because while this wire is usually difficult to tune on 40m, it was being especially so. 

Hmmmmm 

in the mean time, while I was waiting on spots to trickle in, I heated up the soldering station and wound some iron donuts for the QRP Labs QDX I bought a little while ago. 

This radio will feature in my efforts to get on the air as a Park activator in Parks On The Air. It's 5 bands, and does many digital modes including RTTY, and FT-8. My plan is to build a shack in a box, with the QDX, my QCXs, and at least one Raspberry Pi running some sort of radio software. Eventually I'll move from the QCXs and change them to a QMX+. More research and saving  is needed!

Consider hitting the paypal donate button above, and label it "QMX fund" :D

or just send me new Yaesu FTX-1 "Field" . that would be good too.

After installing a couple iron donuts, I checked the spotting network, and saw not much.

I decided to look a little closer, starting with the antenna wire, tracing the signal backwards so to speak.

• The antenna is still in the air
• it comes inside
• it's plugged into the tuner.
• in the wrong spot

What?

 I had the wire hooked into a coax plug, not the long wire plug of the tuner.

that means I tuned the tuner to NO ANTENNA. and I still got SOME spots.

not as many as I should, but there you had it.

After correcting that minor issue, I had a lot more fun getting spots.

I set the beacon on, and let it run over night, getting a lot better results.

From:

To:

to:

To Finally:

worldwide on 40m WSPR! 

Five watts to an end fed antenna about 85 feet long.

One of the things I've tried to teach my kids over the years is "you're never too broke to pay attention". That day, I learned that lesson again.

Better Solar, Only Slightly Better Spots

From midnight-ish to this morning:

first transmission was easily picked up!

Rest of the night:

More spots than the previous test,  but still not a lot. I think I have some station refinement to do. 

Also still need to finish the QDX.