Quote:
Originally Posted by G6Tanuki
It's ages since I delved into a 730/4.
My #1 question would be "is the BFO not oscillating at all, or is it oscillating but doing-so on a frequency that's significantly 'off' from where it needs to be?"
Do you have any sort of frequency-counter you can use to 'sniff' for proof-of-oscillation (even if it's on the wrong frequency)? A length of insulated wire poked into the BFO-coil can should pick up enough oscillation - if it's present - to drive a digital frequency-meter.
If no oscillation, check for failed components.
If the oscillation's there but significantly off-frequency that narrows the problem down to the tuned-circuit components.
|
Sadly own nothing more sophisticated than a multimeter, so I'm just going to have to test the resistors. If replacing any dodgy ones doesn't fix it, I may just replace the caps as well.