Return-Path: Received: (qmail 25132 invoked from network); 17 Jun 2002 11:48:32 -0000 Content-Transfer-Encoding: 8bit Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 17 Jun 2002 11:48:32 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 886 invoked from network); 17 Jun 2002 11:47:54 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 17 Jun 2002 11:47:54 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17JuwU-00075A-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 17 Jun 2002 12:45:06 +0100 Received: from hestia.herts.ac.uk ([147.197.200.9]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17JuwT-000754-00 for rsgb_lf_group@blacksheep.org; Mon, 17 Jun 2002 12:45:05 +0100 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 17JuwR-00048t-00; Mon, 17 Jun 2002 12:45:03 +0100 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 17JuwM-00032i-00; Mon, 17 Jun 2002 12:44:58 +0100 Message-ID: <5.1.0.14.0.20020617121621.00ac5770@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Mon, 17 Jun 2002 12:44:43 +0100 To: rsgb_lf_group@blacksheep.org, lowfer@mailman.qth.net From: "James Moritz" Subject: LF: Old LF D/F Receiver MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Dear LF Group, Lowfers I recently bought a WWII vintage LF and MF receiver, which according to the label was "part of aircraft direction finder DZ-1", type CRV-46123, apparently made by RCA. Does anyone have any info on this RX? It covers 15kHz to 1.5MHz in 6 bands, with a gap from 70kHz to 100kHz, so I imagine the IF is 85kHz. It has a 5 gang tuning capacitor, with separate input stages for loop and wire antennas, and facilities to select either or both antennas for non-directional, directional, or "unilateral" reception, with various gain and phase adjustments. The audio stages appear to have tuned transformers to improve selectivity. The valves are glass types, mainly on 6 pin bases. The tuning dial has main and vernier scales giving 0-1000 divisions, and there is a calibration chart on the front panel. It is simple enough to get working without a manual, but I would be interested if anyone knows more about it. Cheers, Jim Moritz 73 de M0BMU