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Help on 48-482 FM
jerryhawthorne
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#1

11-12-2008, 03:57 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, 03:57 PM
Re: Help on 48-482 FM - by codefox1 - 11-14-2008, 01:42 PM
Re: Help on 48-482 FM - by jerryhawthorne - 11-14-2008, 02:55 PM
Re: Help on 48-482 FM - by jerryhawthorne - 11-15-2008, 09:00 PM
Re: Help on 48-482 FM - by Ron Ramirez - 11-16-2008, 02:13 PM
Re: Help on 48-482 FM - by jerryhawthorne - 11-16-2008, 07:35 PM
Re: Help on 48-482 FM - by Terry Judkins - 11-16-2008, 10:01 PM
Re: Help on 48-482 FM - by jerryhawthorne - 11-17-2008, 07:01 PM
Re: Help on 48-482 FM - by Terry Judkins - 11-17-2008, 07:27 PM
Re: Help on 48-482 FM - by jerryhawthorne - 11-18-2008, 09:01 PM



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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration