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To close the subject, the problem was with me, not with the QMX+. I don't know what I did last week (may have been transmitting on 10m into a 15m tuned dipole), but the rig finally would not switch

On p25 of the Rev 3 QMX+ manual, there is a check for continuity to ground from three points A. BEFORE installing T501, when checking the three points A,? I get about 15 ohms with the DMM black lead

Hello Dave, Dan's suggestion is good with one addition:? do the test into a 50-ohm dummy load.? Antennas can cause higher or lower power due to differences in impedance. 73 Evan AC9TU

Yes, that reminds me. I tested with 12 volts and it certainly got a lot hotter than I expected. The ones I use are fed from 5 volts and keep cool. 73 Alan G4ZFQ

Thank you, Ludwig. That does it. PA voltage now 0.3 instead of 10.9. 73, Steve, N2IC

What did you come up with, Michael?? Did you ever get your 20m power up beyond 1.2w? Joshua

My guess is that DIGI mode has a wider bandwidth so more noise. This will cause AGC to cut the gain a little bit and the spurs will appear reduced. Tony AD0VC ________________________________ Sent:

Well it’s a lovely job. ?? Only noticed it under high magnification !

Hi Mehmet, Everything looks for me. I have no ideas now. I don't have a QMX+, instead, a QMX HB version and a QMX LB version. And 80m is the only band I had trouble with. -- 73, de BD8BTE op: Lun

Steve, if your solder iron has enough power (at least 50 W but better a bit more) you may do this: * Desolder L502. * Apply ChipQuick low temp solder to the two pins of Q507. * Take a bit of flux on

Hi Lun, The phase error plot doesnt complete for most of the bands, not just 20m. All of the plots just look random zigzags and never the same on consecutive runs. Some are just a straight lines

Power supply voltage does not matter for RX. It only makes a difference on TX. You could try and figure out how the output transformer is wired, but that is difficult without removing it. I would

Azgael, please check schematics for QMX+ Rev. 2 / 3 page 1. Gate of Q101 together with LIN_REG_EN is connected via R101 to "+12V". With pressed vol-encoder and not running controller LIN_REG_EN is

For some reason I cannot get audacity to record from the QMX.. But WSJT-X sees it fine (yes, I closed WSJT-X first before trying Audacity). So no audio recordings but another picture. Mel, mine sounds

RR! Will hold off on any more tests/debugging until I hear from you ?

I had a similar experience. After deleting and re-recording the messages, it has not re-appeared. -- 73, Dan? NM3A

After the great BS170 meltdown on my QMX, I'm down to replacing Q507 (Q503 and the BS170's have been replaced and look good). I do not have a hot air rework station - only ChipQuik. It looks like the

Stan, My supply voltage is 12V, and I always use a 12V supply. The plot on 80m never comes to 2000 on the x axis, no matter how I play with the band configuration. After I disabled "20/80 BPF

Lun, the first plot you showed here, with values out to 2000 on the x-axis may work fine, and give you good audio, even though the plot is not smooth. I presume your supply voltage was around 9V?

Is there a straightforward way to delete a message? Any special characters one has to put at the end of a message to prevent this?