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You could put a small buck converter or a couple of diodes in the line to drop the voltage into acceptable range. -- 73, Dan - W2DLC

I wouldn't use FT8, but CW into a well-matched antenna might be ok... XE3/VA3RR

Hello, I have a QMX that is built for 9V. Now I'm making a custom LiFePO4 battery for it. My question is, what's the maximum input voltage that the QMX can handle before it breaks? Given that each

Apparently this microphone works best: /g/QRPLabs/message/141854 Jerry, KE7ER

Chris, Not clear what you were doing there. Strikes me as a very bad idea to apply reverse power to the QMX from your power supply, if that is what you did. You could wind up with a whole bunch more

Hi Jim, wrong, 0 mA in this state and around 200 mA for a part of a second when firmware is running and for the whole time in firmware update mode. You may read QMX QMX_plus Startup (

I would be surprised if this connection is broken.

Hi Azgael, yes, drain of Q102 and VI of IC101 must show the same voltage. But 5 V at drain of Q101 is strange. If the controller doesn't work the gate of Q101 is pulled to 50 % of "+12V", so here

Han, fine if I could get a little help. And you made good investigations to find the problem, well done! Thank you also for this information. 73 Ludwig

When left encoder is pressed? How did you test the SMPS boards, using the method from the QRP Labs Wiki? When the controller isn't running, LIN_REG_EN is pulled to 50% of "+12V". With 10 V in it

Hi Fred I expect WSJT-X is querying and setting the radio via CAT commands. I should change that! Consider it added to my list! 73 Hans

Thank you, that is the plan. Just waiting on the wire to arrive. 73 Doug WB5WRC

https://www.youtube.com/watch?v=YCL3FjQ2WV4 The QMX puts out 10 MHz, a transverter converts up to 10 GHz

SO i had a working qmx rev 2 - purchased assembled - i was swapping my antenna coax from another radio and poof the QMX no longer powers up . I also had a kit so i swapped out the PS boards . Still no

I seem to have dodged this bullet, or something very similar. While powering up my QMX+ for the first time noticed that although it powered up the supply was current limiting.? Tried increasing the

Yes, the SSB software works on all QMX devices, but not QCX or QDX. And you got a good microphone.? I just assembled my kit from Erik and the mic element he is providing is much better (higher

It's really nice to discover what really happened.? Great job in patience and persistence to figure it out, and not just blame the kit - it's almost always something we do that causes the

Hi Zhenxing Thanks, I will do that! But if it works, God knows how many other tracks or vias are open or broken. will be able to do it only tomorrow but will keep You posted. BR Azgael

Hi Azgael, it seems that you're saying the drain of Q102 is not connected to the input of IC101? If that's the case it might indicate a manufacturing error in the PCB. On rev3, Q102 and IC101 are on

Ordered! And I have a backup plan.