Fellow QRP'ers,
I just completed a rev 3 QMX build.? I am VERY impressed with level of sophistication of this very small piece of kit.
I'm afraid I have made an error in my assembly and I need to ask this forum for a bit of help in sorting it out.
I am happy to say that I was able to flash the firmware and boot up the radio without a problem.? Also, when attached to an antenna I can clearly hear the sounds from the FT8 frequencies (my unit is the 20-10m model) so the receive parts of the circuit seem like they are functioning.? I am also able to connect to WSJT-X and get good decodes at least on 20m (the other bands may have little traffic right now).
However, I have no power output on the transmit side.? I will attach screen shots from the SWR sweep menu utility, but the measurements are erratic and VERY high (all run on a dummy load capable of 25W).? Also, when I go into the Diagnostics screen and press the "t" button, I get 0 power out, about 9.5 volts and the SWR bounces around between 6 and 10.? This behavior is similar on all bands.
My initial theory is that I have somehow messed up the SWR transformer (T507) and this is causing the high SWR protection software to keep the radio from producing any output.? Before I break out the soldering iron again to pull T507 out of circuit and possibly rewire it, I wanted to get some feedback from those with more experience ?
Thank you in advance for any ideas for further troubleshooting steps or alternate theories about what I have done wrong.
73
Mike
KC2EHR
