Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site alice.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!allegra!alice!danny
From: danny@alice.UUCP (Dan Kahn, K1DK)
Newsgroups: net.ham-radio
Subject: Re: Antenna Tuners on Receivers
Message-ID: <3011@alice.UUCP>
Date: Thu, 27-Sep-84 16:36:46 EDT
Article-I.D.: alice.3011
Posted: Thu Sep 27 16:36:46 1984
Date-Received: Fri, 28-Sep-84 06:21:40 EDT
References: <239@whuxl.UUCP>, <52800034@trsvax.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 14


  
Re KA5MJQ's reference to technical lit on broadcast-band auto radio
antenna matching and possible applicability to HF rcvrs:

The front-end design in broadcast-band car radios is completely
different from that in HF rcvrs.  This is due to the fact that in a car
you're using a 3-foot long antenna to rcv signals whose quarter-wavelength
is several hundred feet.  In a car radio, the capacitance of the antenna
coax (coax mandatory for noise shielding) and of the antenna itself is
part of the RF-stage tuned circuit; that large amount of fixed C is why
the radio must be inductively tuned and why proper front-end tuning
(i.e. setting trimmer cap) is critical.

					Dan, K1DK