Quote:
Originally Posted by Penthode
with regards to the core positioning for maximum. You said the core was unscrewed to get the peak. Unscrewing the core reduces inductance which means you are tuning it higher in frequency. What I think you have done is tune it to the same frequency as another stage and it has introduced oscillation! I mentioned the danger earlier of it breaking into oscillation. I suggest you must fix this before adjusting the traps!
Put the core back close to the original position. The circuit tunes broadly and you should detect a smaller peak near the original position. Also if you do get into a state of oscillation and cannot get out of it, what you do is increase the AGC voltage until the oscillation ceases and try increasing the 8601a input until you see the signal.
Certainly if you are having to adjust any opf the circuits that far away, you are doing something wrong. Becareful and stop and think and ask before making assumptions.
|
OK I will go back and turn the core back in on T-106 and look for the smaller peak.