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