Re: v4 ubitx stuck in transmit
Curt,toggle quoted messageShow quoted text
Check your T/R line from diagram and see if there is voltage on it, then it will TX even with the raduino removed.
I suspect a speck of solder shorting somewhere.
Check K1 relay voltage on pin 8 and 9 - both should be 12V (means OFF) if one pin is 12 and other 0V then you may have
a shorted Q15.
At 27-01-20, you wrote:
Definitely a mystery. I thought I was in final stages of mods - last step was installing a second 45 MHz stage in transmit path. I powered on - found my ubitx stuck in transmit. I removed radiuno - still stuck in transmit. Finally I removed the xtal filter mod that was across R22 (yes I including a block cap and left the 50 ohm resistor) - still stuck in transmit - I do currently have nothing across R22 but that should not matter, I don't think for this circumstance.