48-472 No FM - Printable Version

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+--- Thread: 48-472 No FM (/showthread.php?tid=16221)

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48-472 No FM - Eric Adams - 02-10-2017

Hi guys,
I've got one that I've been working on for a while. All caps replaced, tubes tested. AM works great-nothing on FM.
Any ideas?



Thanks,

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RE: 48-472 No FM - Mondial - 02-10-2017

If you input a 9.1 MHz FM signal from your 8601A into the first IF stage, do you hear anything?

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RE: 48-472 No FM - Eric Adams - 02-11-2017

Would that be applying the signal at the antenna or where it states in the instructions? 
Thanks,

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RE: 48-472 No FM - Mondial - 02-11-2017

Where ever the alignment procedure says to input the 9.1 MHz IF signal for alignment should be fine. What you want to find out is if the IF or FM detector is the problem, or its the FM local oscillator that's causing no reception.

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RE: 48-472 No FM - Eric Adams - 02-11-2017

Great. Thanks. I'll check it later today and let you know.

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