Just checked. Yes, there is 12V at the drains of Q1, Q2 and Q3 on key down.
I checked with the built-in power meter - 0W at the BNC output, but 2.28W at the drain of Q3. Not sure whether that means there is RF, but a fault in the LPF now. I have continuity from the BNC inner to one side of C29 which suggests the toroids are OK.?
Over to you Alan!
Steve G0KYA
