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This matches my experience too - I had been trying Contestia 4-250 and it was cutting out on transmit and whenever I restarted. I just tried Thor, DominoEX, and MFSK and those are all working. I can

Here is my diode^ -- 73 Karl KI4ZUQ

Hi Adrian? you can test the U4B on usb power but it is much better to use a battery and then you will get the correct telemetry voltage and have the gps free of possible computer or power supply

OK Dave, it sounds like there is no connection between R39 and R40 and there should be. One side of R39 connects to ground (0 v) and the other side is supposed to connect to R40. Where they connect

Ludwig, The sweep signal passes through both an LPF and a BPF on its journey from the clock generator to the detector. As the 20m and 17m LPFs are different one should expect to see some differences

I can confirm Daniel's experience here.? I have a new ultra picokeyer.? As built, it would put my QCX and QMX rigs into key down.? I cut the trace going from PIN 5 to the ring, and now the

Ron: ?I got 11.16v off of R40 and 0 volts from R39 and I’m getting 11.6v on pin 5 of IC-10 I’m not sure what you meant by the junction of R40 and R39. I took voltage readings from the wire off

I realize the documentaion says that the QRP Labs QLG2 comes set to 9600 Baud, BUT, is there a way to reset it to 4800 Baud permanently? I still have several devices that are standard of a "few" years

Dunno, Dan. There are a lot of QMX out there now and this specific failure remains at quite a low level. Yes, that's no comfort to you as you had one of those failures ;-( It is also a little

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