22nd Sep 2022, 5:52 pm
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#34
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Heptode
Join Date: Jul 2020
Location: Larkhall, South Lanarkshire, Scotland.
Posts: 671
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Re: My Latest Junker. Courier AM Car Radio.
Quote:
Originally Posted by Mr 1936
Hi
Car radios use inductive tuning because:
It is physically smaller
It is electrically more suited to a short rod antenna. In a traditional design the first tuned circuit has a fixed parallel capacitor made up of the capacitance of the antenna, plus a short length of special low capacitance coax, plus the aerial trimmer, plus a fixed value. Since the first two are outside the control of the designer, the trimmer is used to ensure alignment.
Since FM came along this has all gone out of the window, and a FET preamp with no trimmer is used.
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Cheers for that,  Makes sense ,
Jay
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Help!! I've been electrocuted by a glass thing that glows 
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