Hi Vule,
1) Do You have original ubitx V6 display? If Yes, is "TX" sign disappearing from the screen after TX is switched OFF?
2) Is this happening when toggling PTT (also for longer period) with RF power (CW, SSB with modulation) and with microphone?
2) Is powering ubitx OFF and turning it back ON causing back to RX?
?
If this is relay(s) issue - then relay replacement might be necessary. I believe better quality OMRON G5V-2 12 VDC might be considered.
?
If this is Your PSK/RTTY device issue then will be difficult to help - more data needed - eg. monitoring of voltage on PTT line - as I remember PTT input is configured as pull-up input in Arduino.
?
Might be also socket issue.
Might be a problem even with Arduino nano... which of course can be bought without gold-pins soldered, then pins needs to be soldered on the other side than market versions, flashed and installed into raduino board.
Something else...
?
Regards
Tomasz
tomekdm sp7etd