Quote:
Originally Posted by TUD1
Ah. I thought it would be something like that. But what causes it to behave that way? Weak tube in the IF department? I was thinking that it could be a dirty contact somewhere, or possibly the tuning condensor coils touching.
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'There is nothing wrong, do not adjust your set.'
ANY IF frequency signal WILL get into the IF of the average consumer set (I have some interesting examples if you doubt me).
As has been said your transmitter is mixing with that local station in the air and generating (in the space of your transmitter's range) a signal that matches most AM sets' IF frequency.... The best way to fix it would be to re-tune your transmitter to shift the difference signal away from the IF.
It would be an EPIC feat of redesign to make the set immune to external IF images....You would have to shield the living crap out of it and add filters in the antenna and RF pre-amp to prevent frequencies below AM from getting to the mixer/converter stage.
As someone who has dicked around with AM and TV band transmitters, and a variety of signal generators I've seen this and a variety of other interesting effects.