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OK Dave, looks like there's something wrong in the area of R39 and R40. Those two resistors form a voltage divider from the 12v input and should show about 6 volts at the junction of the two. That

I have built a U4B tracker package - powerfilm solar panels, supercaps, shunts.? Hooked up the 20m mag wire antenna for testing.? Powering it via USB. I am not seeing any WSPR transmission on 20m

IC-8 pins 1,2,3,5,6, and 7 were 2.4v IC-9 pin 1 was 4.77v, pin 2 was 4.77v, pin 3 was 4.44v, pin 5 was 2.4 v, pin 6 was 2.4v and pin 7 was 2.4v IC-10 pin 1 was 12.58v, pin 2 was 12.58v, pin 3 was

Hey OM Frank; Thanks for the nice feedback ! AND I'm thrilled you got things operating on at least one device. The extra audio setting that was on one of my two androids was NOT obvious at all, so

Be sure TxID is off and you're using firmware 017. Testing here only Thor, DominoEX, FSQ, FSKH105 & 245, IFKP, and MFSK work. The QMX does not like the other modes even though before firmware 007 they

+1 from me for a mid-band QMX! I'm waiting with my purchase for exactly that. 73, Andreas

Maybe IC407 needs its own Zener protection. -- 73, Dan? NM3A

I am having this same issue with RTTY on my low band QMX, firmware level 014. WSJT works fine with FT8. - fldigi attenuator IS set to 0db (saw the pointer on YouTube about that) - audio out is 100%

I had notification on Monday that my QMX had been dispatched and expected several weeks of anxious waiting - but was pleasantly surprised when TNT knocked on my door today. Three days door to door.

Ok. Then you next should check the bias voltages on the op amp ICs 8,9 and 10. With your DVM you should see about 2.5v on pins 1,2,3,5,6&7 of IC 8 and on pins 5,6&7 of IC9. You should also see about

I have. It ranges from blank to dark. Also forgot to mention that I did carefully check the 2x4 connector. Ed Ridolfi c: 978.771.6537

Have you tried adjusting R305, the display contrast control? John AE5X https://ae5x.blogspot.com

OK! Nice job on the repair, Dan! I have seen other ADC failures occur, just a small few. Of all the components that connect to the 5V distribution, the ADC is the most vulnerable to overvoltage

Picture -- 73, Dan? NM3A

JZ, Well, I got the PCM1804 today and installed it. That cured all the noise problems. So apparently I got a bad chip from the factory. Second one at least, as Martin also had this issue. At least I

My max BPF adjustment was 9

Hi Dave. What signal level did you see when you did the bandpass filter adjustment? Ron

Hello Dmitrijs, If you use the search engine for "2200m" you will find my posting giving the components and turns for the QDX-M operating at 137.5 kHz, plus a url to a reflector with pics of the

I just built a QCX version 3 PCB that I purchased from QRP Labs several years ago. Upon completion of the kit I am having volume issues. With the gain turned to max I can barely hear the tone. I

A few things assuming QMX vs QDX has similarities. - fldigi audio/attenuator level to 0 (what is yours set to?) - audio/mixer outputs all at 100% (yours?) - Rise and fall thresholds may need