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From: dma@ssc-vax.UUCP (Dennis Anderson)
Newsgroups: net.analog
Subject: Re: Does anybody know why Auto AM radios tune with variable inductors?
Message-ID: <471@ssc-vax.UUCP>
Date: Tue, 14-Jan-86 11:06:54 EST
Article-I.D.: ssc-vax.471
Posted: Tue Jan 14 11:06:54 1986
Date-Received: Fri, 17-Jan-86 06:50:10 EST
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Distribution: net
Organization: Boeing Aerospace Co., Seattle, WA
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> I have found that 99% of auto AM radios use a bank of variable
> inductors for tuning; whereas all other portable AM's use
> variable capacitors.  Anybody out there know why?  My only
> guess is that the variable capacitors might not be rugged
> enough, but it seems unlikely.
> 
> 	Kevin Szabo
> -- 
> Kevin Szabo' watmath!watvlsi!ksbszabo (VLSI Group, U. of Waterloo, Ont., Canada)

It probably allows for a more reliable push-button tuning system.  Small errors
in the position of a tuning slug would have less effect on the inductance than
the same amount of slop in the angle of a variable capacitor.


					Dennis Anderson @ Boeing Aerospace