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Old 23rd Sep 2022, 11:50 am   #37
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
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Default Re: My Latest Junker. Courier AM Car Radio.

Quote:
Originally Posted by Radio Scotland View Post
Anybody know why car radio's use inductor tuning ?
Permeability tuning also solves the potential problem of capacitor tuning gang microphony.

There's also less change in selectivity and gain when tuning across the band.

W.J. Polydoroff did some work with permeability tuning back in the early 1930's, there is an article by him in the 1933 edition of the proceedings of the IRE which starts on publication page 690 in the link below for anyone that might be interested:

https://worldradiohistory.com/Archiv...RE-1933-05.pdf

Lawrence.
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