Muro deGrizeco2d ago

Got a little QDX radio that isn't working.

Connects via USB, just looks like a sound card and a serial port.

It works like a penny whistle!

You blow on the end of the USB cable, and it measures the zero-crossings of the audio waveform, figures out the frequency, adds maybe 7 or 14 million to the number, then squeaks out a 4 Watt RF whistle to the antenna.

Except the BS-170 N-channel MOSFETs probably popped from high voltages from momentary bad SWR.

So no happy whistling.

#QRP #QDX

Show threadK9CUFMar 11
@bgarfoot @hb9hox This is what my #QDX that I built a few years ago looks like, with the addition of some 3D printed retention tabs (the purple things) #AmateurRadio
Jim "Ham on a Bike"Aug 22, 2025
A view of my cockpit for my "Early Bird #pota #parksontheair activation. @qrplabs #QDX #qdxdigital #qcxmini #qrpradio #cw #morsecode #PanasonicToughPad #qrpguys #minituner #linkedefhw
Jim "Ham on a Bike"Jul 4, 2025
It was a 40M @qrplabs #QCXmini #CW #MorseCode & 40m/30m #QDX #FT8 Early Bird 4th of July #POTA #parksontheair activation Almost had some early fireworks display if I only could have completed a FT8 #QSO with Bob @KF0UNK My #QRP signal just didn't have enough oomph to break through the traffic #AmateurRadio #HamRadio
DG1JAN πŸ‡ͺπŸ‡ΊJul 3, 2025
Finalized my #QRPlab #qmx build today 😍 after some hours of sweating, the small TRX is running out of the box. Compared to my #qdx or #trusdx builds, I have to admit it was quite challenging due to the enormous part density. But nevertheless, the first SSB and FT8 was successful. But I will need to build me a new external mic with a proper electret capsule, my modified Chinese Mic has much too low gain
Steve DuncanJun 25, 2025

Meshtastic, APRS, D-Star, QDX and getting back into radio

Ham radio is a cyclical hobby for me, and when the interest comes it comes fast and strong. And so it did several weeks ago…

It started with a trip to Wabeno, WI to help support the Wisconsin Dual Sport Riders annual Ride 4 Research. It’s a dual-sport motorcycle event held in the backwoods, where there is very spotty cell coverage. It’s one of the only (maybe the only) events of it’s […]

#AmateurRadio #APRS #DStar #H2T #HamRadio #Icom #ID50a #ID5100 #LilyGo #Meshtastic #MuziWorks #QDX #QRPLabs #Yaesu

Venya (he/him/dude) πŸ‡ΊπŸ‡¦Jun 20, 2025

I can do this

probably

#qdx #qrp #AmateurRadio #electronics

Steve DuncanJun 16, 2025
Ok, just discovered digipi.org, which seems like a perfect combination for the QDX for doing digital modes on the go. Here I’d been thinking I might have to go buy a laptop…but here’s a solution for $40ish. #ft8 #qdx #raspberrypi #digipi #hamradio
Show threadSteve DuncanJun 16, 2025
It took about 6 hours to build, including an embarassing amount of time getting power for my Pinecil solding iron arranged. Not bad. I was worried by all the toroid dread I’d read from others, but really no big deal. Now I’ve got to get an outside antenna sorted out. #qdx #hamradio #ft8 #qrplabs
Jim "Ham on a Bike"Jun 3, 2025
I built a #QRPGuys 40-10 #Minituner a few years ago but never built a wire for it. Thanks to current #Geomagneticstorm conditions, I built a 40 -15 Meter Linked #EFHW that I can use with my #Youkits #YouKitsHB1B #HB1B and my #QRPlabs #QDX. #AmateurRadio #HamRadio is so much fun!