19-10-2017, 06:50 PM
Hi Richard
Inject your modulated IF signal into the collector of T4 and listen for the signal on the speaker.
If that works turn down the output from the signal generator so you can just hear it.
Connect the signal generator to the collector of T3 and listen for output.
Turn down the generator again so you can just hear the tone.
Then connect the signal generator to the collector of T2, turn down the generator output.
Repeat again on T1 collector if you get a signal in the output, then suspect T1.
If the signal stopped along the way then suspect the transistor immediately upstream (towards the audio amp) to where the signal stopped.
If I am talking complete gibberish then will someone please tell me.
Mike
Inject your modulated IF signal into the collector of T4 and listen for the signal on the speaker.
If that works turn down the output from the signal generator so you can just hear it.
Connect the signal generator to the collector of T3 and listen for output.
Turn down the generator again so you can just hear the tone.
Then connect the signal generator to the collector of T2, turn down the generator output.
Repeat again on T1 collector if you get a signal in the output, then suspect T1.
If the signal stopped along the way then suspect the transistor immediately upstream (towards the audio amp) to where the signal stopped.
If I am talking complete gibberish then will someone please tell me.
Mike
