I've been building kits starting about 1960 and have quite a bit of experience with a soldering iron. With a bit of finesse you can use side cutters to scrape the enamel off, sometimes I'll hold pull

I use a Luxo Wave magnifying LED light, it's quite expensive but the optics are excellent. A cheap Chinese version lasted only a few months before the joints loosened up and the head wouldn't stay in

Nice job! You could share the file on Thingverse.

The digital modes can be used when CW can't be copied (or even heard). CW is usable at -15 dB, JT65 can be decoded at -25 dB (and WSPR at -30 or -35 dB.) There's a uTube video out there of Dr. Taylor

My experience with Linux goes back to the 0.9 kernel before modules (which the kernel now loads depending on your hardware.) I had to compile the kernel to include my Ethernet card - compiling took 8

Same thing here: Oops! Something went wrong. This page didn't load Google Maps correctly. See the JavaScript console for technical details.

#wspr

I've built two U3S's and the part density makes it quite a challenge for this old-timer, I feel your pain with the small gauge leads on the resistors. For an enclosure, buy a 3D printer and print one

My U3S runs off one of my shack's two 12V power supplies and I use a LM7805 on a little prototype board inside the U3S case. The heat from the 7805 keeps the board thermally stable. I think I measured

#u3s

After a few minutes it updated the lat/long and everything is working fine now. Bizarre!

#u3s

My morning online routine begins with checking WSPR spots reported from my U3S and to my complete surprise there were no spots in the database, every morning for the last couple of months I always hav

#u3s

I think that's just a simple board with traces on each side, like Alan recommended I would try a repair. Clean up the traces with a Fiberglass scratch pen brush and replace the traces with wire. If a

My U3S is putting about 250 mw into a MyAntenna end fed dipole. I get lots of spots every 10 minutes on 30m. My drift is almost always zero, with an occasional one or two Hz thrown in.

“.... I had one module that almost never achieved the '=' mark; if it did it would be off the next calibration cycle. The reported spots almost never reported '0' drift. ...” The first U3S I built beh

#u3s

When I was using the plain old Si5351A synthesiser module (no GPS correction) I was getting drift reports of 0 or 1 - it was very stable. My U3S is in the aluminum case but I have a LM7805 voltage reg

#ocxo #u3s

DOH! What a dummy. I forgot to change the calibrate step time on this U3S kit - I did go through this on U3S #1 but completely forgot on #2. Now we are calibrating and the reference frequency is chang

Thank you Krause, your English is better than some with English as a first language ;-) I have set the U3S up to do a calibration every few minutes, the oscillator must be stable because there is usua

First off, my apologies if this has been answered/discussed/in the manual. Some kind soul emailed me saying I was transmitting 100Hz outside of the WSPR frequency range on 30M, I always thought I didn

I've also characterized the LP filters (maybe 5 or 6) with my Siglent spectrum analyzer and had similar results. I think the best performance I had at a band edge was ~0.3 db down the worst was about

Just sent a picture of my box.

I built two QLG1s, the first one has a blinking green LED when a fix is acquired, the second one will not blink the green LED with a fix. I know #2 QLG is working fine because it's hooked up to a U3S.