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The voltage on LIN_REG_EN is a little over 0.7 volts when the power on switch is pressed, which leaves me a bit suspicious... Still don't understand what could've compromised the CPU.

Well, I thought I had an easy glide path. Repairing the Q103/Q104 short, I damaged (lost) R104 and D102. Turns out what I was seeing was, with no pull up, once connected to the supply the 12 volt

It seems to be ok so far, firmware loaded and the display is working.

Thanks Jeffrey, I found a solder whisker bridge from the plug in PCB#1 edge connector to the FET.? It turns on with the switch now, I hope there isn't any damage to the CPU.

*IT's ALIVE!!!* The QMX hears and transmits as well! (Ironically the 1st thing it heard was from the QRP-Labs SigGen!) On transmit without any adjustments at ~12VDC? into my QRPoMeter dummy load I

I have the same question Hans. Is it possible for invoice 72091 to be made for 9V?

Rick, was not an issue with the inductor/ pin 3, just brighter than I wanted. -- 73, Dan? NM3A

I'm just adding the #QMX hashtag, which I'd inadvertently left off. ?Thank you again in advance for any troubleshooting advice regarding the ~10ohm resistance detected across some of the A and B test

Just put in a 120 ohm (leaded) in place of the 33 ohm. Much softer and it's fine, but could have even gone to 150 or 180. Thanks for the info. BTW, I did not remove the 33 ohm, I just cut the one

Update: Definitely a toasted zener on the 3.3V PSU board. Hooked up 3.3 board to bench supply. High current draw, zener gets hot. Removed zener. Current draw now reasonable. Installed 3.3 board into

Please post pix, Sandy. 73 Jim K1IR

First fire up on QDX 20-10. Led flashes normally. L4 started smoking. Yikes! Now terminal shows only 80m, no other bands. Wsjt works into 50 ohms but usb sketchy Replaced L4. Removed Diodes D1

4 watts vs 3 watts is 1.25 db. IMO there are bigger fish to fry. I intend to run off a car battery inverter so I took some extra steps to ensure thermal performance at 13.8 vs. 12. I put thermal

My QDX was working fine until I was attempting to use it to drive a 100 watt HF amplifier. ?That amp failed, spectacularly, and now the QDX has these symptoms — 1. RX is good on all bands, with

Yup! Looking forward to the 'with' results! -- 73, Dan? NM3A

Without.? My plan is to get good data without, then add them and see what the difference is. This is Science isn't it?

Because 12V is greater than 9V? The 12V version has a different turns ratio on the output transformer.? So while the voltages on the output side are the same the voltages on the driver stage are

Chris, is this with or w/o Zeners? -- 73, Dan? NM3A

The short is somewhere on the main board, verified by pulling out the PSUs and testing each board individually. I wish the PSU was the problem since it's easier to just order another power module than

I think it's just a matter of being cautious. I use an Elecraft T1 to tune but use a tuning indicator (TI) that ensures no more that 2:1 swr is presented to the rig. I have forgotten to put the TI in