Return-Path: Received: (qmail 26081 invoked from network); 28 Jan 2000 07:43:23 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by bells.core.plus.net.uk with SMTP; 28 Jan 2000 07:43:23 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12E5rU-0005pA-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 28 Jan 2000 07:30:32 +0000 Received: from anchor-post-33.mail.demon.net ([194.217.242.91]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12E5rT-0005p5-00 for rsgb_lf_group@blacksheep.org; Fri, 28 Jan 2000 07:30:31 +0000 Received: from alg.demon.co.uk ([194.222.171.80]) by anchor-post-33.mail.demon.net with esmtp (Exim 2.12 #1) id 12E5rO-000F8F-0X for rsgb_lf_group@blacksheep.org; Fri, 28 Jan 2000 07:30:26 +0000 X-Priority: 3 X-MSMail-Priority: Normal Message-ID: <3891453E.95058390@alg.demon.co.uk> Date: Fri, 28 Jan 2000 07:29:02 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 From: "Steve Rawlings" X-Mailer: Mozilla 4.04 [en] (Win95; I) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Automatic ATUs References: <14850.200001271335@gemini> <3890980D.7B7D@xtra.co.nz> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Bob ZL2CA wrote: > . . . . Once the > LF antenna has been "tuned and matched" using the likes of a (big) > loading coil with taps or L match, the relatively small variations in > reactance with changing conditions could be handled with a motor driven > variometer (say 50 uH range). . . . . I have been using such a fine-tuner on 136 kHz for several months with great success. Although not 'automatic' in operation, the tuner is remote- controlled, and enables rapid changes in operating frequency to be made. Details of the general arrangement can be found at: http://www.alg.demon.co.uk/radio/136/rem_vario.htm Regards to all, Steve GW4ALG