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Somehow did the update to -10 firmware with the PWR and SWR displays and protection. Tried transmitting on 20 meters through a tuner that was set for low SWR and the QMX went full scale and shut down. Receive still works but no transmit.

The access to putty seems inop so no diagnostics.... the COM6 loads when the putty window shows but a error window shows no comms via COM6.

Anyone else experiencing this? Oh, yeah....before this xmt quit all together the swr could be lowered by retuning. The antenna can be tuned with a nanoVNA, the normal tranceiver on any QRP power setting and with the 50 watt amp but has to be tuned differently with the QMX. Tells me the SWR bridge or firmware not right.

I may go back to -9 firmware...
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73
Karl
KI4ZUQ

I xmt. On EFHW antenna tuned with a NANO VNA. I have no problems. QMX shows low swr. Have made several contacts.

Start at the beginning. ??

What happens into a dummy load

If it works there what frequency/power is actually being transmitted ??

?

This radio was successfully completed, tested and proven earlier this year on firmware? ending in .9 then failed with firmware ending in .10 and failed as described.
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73
Karl
KI4ZUQ

That clearly indicates that the SWR bridge is not working correctly. The V10 firmware works as expected in my QMX. Start debugging with an inspection of the SWR hardware and use a dummy load for testing.
73 aa0jr Jakob

Try re-loading the firmware. ?If that doesn’t work try loading the older firmware.?

73, Bill NZ0T

As Bruce asked, how does it behave on a dummy load? The SWR bridge wasn't being measured by the previous firmware so the SWR bridge could well be faulty.?

This problem recently resolved (posted elswhere on this forum since I could not find this thread!) by removing, rewinding T507 and re-installing. T507 okay but solder joints mostly non-conducting.
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73
Karl
KI4ZUQ