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Pins 3 (TIP_SW) and 4 (RING_SW) allow detecting whether a plug is inside the receptacle.When empty, pin 3 is shorted to pin 2 while pin 4 is shorted to pin 5. Pin 1 is not connected to anything. When

My QMX had been working great. When listening on 40m during some qrn, but not actually thunderstorm at my qth, QMX shut down. Rebooted and rx on 80, 60 and 40 m has gone. -50db or so on audio sweeps.

I'm not sure if this is available from their Amazon store, but I found this on their

Gwen, Pretty neat stuff! I drooled over those kits. Unfortunately, we had even less money so all I got was a newsprint book of science experiments. I made do with one of those giant dry cells, wire

I'm thinking of putting a small class D audio amp and tiny speaker/s in my build when I get that far (along with battery/charger and possibly ATU) It looks as though I can pick the audio up from JP301

I recently build my 6th kit from QRPLabs (2nd QMX, first QMX MB) and it is really a pleasure with those high quality kits and manuals. There is one difference as I the first time experienced to much

FB indeed Barry es tnx fer your help. Really appreciated. And tha

QMX 80-20, Rev 3, 12V Got it to a point where swr and lpf sweeps look good for all bands. Managed to do some test transmissions on 40 and 20m :-) All my audio filter sweeps have a flat yellow line,

Hi Matt N3AR, You are correct that EN11-HSM1AF15 is just a close approximation of what is normally sourced from QRP Labs. However, I was able to make it work with some mechanical modifications. The

I had a look at the schematic and identified the toroids, capacitors, diodes and inductors related to 60/40m. Re-flowed 5he solder on all of those and the swr and lpf sweeps look normal now. Still

Hi Wayne Make sure you are looking at http://qrp-labs not https. What you see there is typical of what you see when you're looking at https. 73 Hans

if YOU were a YL you'd never being? those dates and ages.. .we can all add up ... .mostly.? :-))

Hi Geoff, My QMX does the same thing.? The story with mine is that initially there was a short on between the fets on the plug in regulator board.? I fixed this short by heating up the fet and

You could check with Jeff Moore W1NC, who definitely has the skills and tools to fix it. He could return the working unit to you, or maybe he would be interested in passing it along to someone else.

Hmm, well, that is working today... I'm confused because I'm 99.99999% sure I tried turning it off and back on again several times last night with no luck, but the first try today worked.? I also

I brought my QMX back from the dead with 2 new buck supplies, and a firmware update. Things look good on the terminal session except for the control board buttons which don't do much except tune the

I did some quick searching and couldn't find anything like this in the messages. Before I get out the scope and schematic, I figured I would ask. I just finished my first QMX+ build. All seems ok

Danny QMX set PTT GND es wire tip(+) es sleeve(GND). Tip will ground when engaged. On HL50B Wire QMX GND to ACC pin6 and wire QMX Tip to ACC pin 8. Enjoy my friend 'Barry

My parents never had enough money to get me anything from Heathkit. If they DID, my father would have gotten it for himself, and I would have only gotten anything out of it by "helping" him build it.

Thanks for the alternative page!! Wayne