I just built the 2N2222 interface circuit and haven't been able to get it to key my rig. Does anyone know what the signal level should be at the db9 output/cw interface input?
I can put a positive voltage of 12v on the input and it keys the circuit and the radio fine, so the circuit appears to work fine at that voltage level.
and, the software seems to be working fine as I get pulses on the scope when I view the db9 output.
