Transmit flickering after tuning the coils.

[quard]

I have fried the FTD86256. After replacing with a fresh one I tried to tune the coils but in some moment noticed weird behavior on PTT button press, transmission start flickering(switching on and off many times) and only after a while became on. My suggestion was that I have fried the new FET but replacing does not help. But now I have power output about 9-10W instead of 4.5W.

Also first time after power on when I switch the mode to CW it tries to transmit. The same behavior I have with and without RF board connected. EFF and PWR measurements seems ok because without RF board EFF is non and PWR is 0 or about it. And output power I have checked with external swr/power meter.

https://youtu.be/xR7ix_kvGAU

Voltages are fine, 5V and 12V or about 4.7V on USB. RVS voltage is less then 40mV in standby.

Does anyone have any suggestion what could cause the problem?

[KE0QQQ]

Hello ,
Sorry for the errors, it ain't good
I will never ever hit that transmit button without anything attached to the antenna
And always use USB power to test

The nan% error is some type of an open circuit. I have done it. My mistake was wrecking the long pinned connector between the boards when it happened to me.

A search of the error may be helpful
https://forum.dl2man.de/search.php?keyw ... mit=Search

[quard]

"nan" is totally fine in this case because RF board are not connected. My problem that power become is too high and I got flickering effect on PTT press.

[quard]

Ok, I have found the issue with sending after reading reading the calibration manual again, somehow I have change the key from straight to the iambic. Pretty stupid)

But I still have the issue with power, it is quite high especially on the 15m and 10m, my power supply goes into CC on 1.5A while on 80m, 40 m and 20m consumption is ok and around 1A. Digging further...