Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxj!houxm!vax135!cornell!uw-beaver!tektronix!hplabs!sri-unix!WMartin@SIMTEL20.ARPA From: WMartin@SIMTEL20.ARPA Newsgroups: net.ham-radio Subject: Re: some questions about UNIDEN CR2021 Message-ID: <12142@sri-arpa.UUCP> Date: Tue, 18-Sep-84 10:41:24 EDT Article-I.D.: sri-arpa.12142 Posted: Tue Sep 18 10:41:24 1984 Date-Received: Wed, 26-Sep-84 00:51:44 EDT Lines: 21 From: William G. MartinI think the antenna-trim on the CR-2021 is just changing a variable capacitor in series with the antenna input; that's what "antenna tune" controls on other radios I've seen have done. As for the whip vs. external, the whip is always active, I am sure. This can cause problems if you try to use an external medium-wave loop antenna for Broadcast-Band DXing, but otherwise shouldn't have much ill effect. I have some Uniden literature on the CR-2021, and it gives no technical specs at all, so I don't know the bandwidths or RF attenuations. As to modifications, sounds interesting, but I have heard of none yet. By the way, has anyone out there gotten a SERVICE MANUAL yet on the CR-2021, and, if so, please tell the list the price and where to write to order one. I have the Sony 2001 manual, which was only $2.00 from the Sony Kansas City parts depot, but, even if the circuit is similar, the mechanics are different enough that the real service manual would be worth having. Will Martin -------