Help on 48-482 FM

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Help on 48-482 FM

jerryhawthorne
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Posts: 1,562
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Joined: Nov 2008
City: Sedona, AZ/Placentia/CA

11-12-2008, 04:57 PM

I'm working on the above and have finally got the FM working well after alignment of the IF. I went to adjust the FM detector xformer and in the first step, I got no response from adjusting the trimmer. I used my scope/counter and looked at the detector oscillator and it was running at 10.4 MC and the trimmer did nothing to change the frequency. I measured the resistance between the yellow and white wire coming out of the oscillator section of the xformer and got about 6 ohms. I am not the brightest bulb when it comes to electronics but it appears from the schematic that should read infinite due to caps in the can. Am I wrong? Tuning in an FM station and turning either the trimmer or adjusting the coil has no affect on the signal reception. I don't see how it can work with the IF frequency running 9.1 MC and the detector oscillator running 10.4 MC. Can anyone out there shed a little light on this?
Jerry

A friend in need is a pest! Bill Slee ca 1970.

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Messages In This Thread

Help on 48-482 FM - by jerryhawthorne - 11-12-2008, 04:57 PM

Re: Help on 48-482 FM - by codefox1 - 11-14-2008, 02:42 PM

Re: Help on 48-482 FM - by jerryhawthorne - 11-14-2008, 03:55 PM

Re: Help on 48-482 FM - by jerryhawthorne - 11-15-2008, 10:00 PM

Re: Help on 48-482 FM - by Ron Ramirez - 11-16-2008, 03:13 PM

Re: Help on 48-482 FM - by jerryhawthorne - 11-16-2008, 08:35 PM

Re: Help on 48-482 FM - by Terry Judkins - 11-16-2008, 11:01 PM

Re: Help on 48-482 FM - by jerryhawthorne - 11-17-2008, 08:01 PM

Re: Help on 48-482 FM - by Terry Judkins - 11-17-2008, 08:27 PM

Re: Help on 48-482 FM - by jerryhawthorne - 11-18-2008, 10:01 PM

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