Return-Path: Received: (qmail 25656 invoked from network); 28 Nov 2001 17:07:39 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 28 Nov 2001 17:07:39 -0000 Received: (qmail 6246 invoked from network); 28 Nov 2001 17:07:29 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 28 Nov 2001 17:07:29 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16985L-0008AQ-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 28 Nov 2001 17:01:23 +0000 Received: from ligarius-fe0.ultra.net ([146.115.8.189]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16985J-0008AL-00 for rsgb_lf_group@blacksheep.org; Wed, 28 Nov 2001 17:01:21 +0000 Received: from comrex (207-172-255-40.s1056.apx1.sbo.ma.dialup.rcn.com [207.172.255.40]) by ligarius-fe0.ultra.net (8.8.8/ult/n26500/mtc.v2) with SMTP id MAA02034 for ; Wed, 28 Nov 2001 12:00:36 -0500 (EST) Message-ID: <005901c1782e$a7ac4c00$09dc9384@ma.ultranet.com> From: "John Andrews" To: rsgb_lf_group@blacksheep.org References: <000201c17824$55fd3d60$9dfbcdd4@1> Subject: LF: Re: ICOM R-75 Date: Wed, 28 Nov 2001 12:03:20 -0500 MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2314.1300 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit
Alex,
 
Personally, I'd leave it alone, unless you were really limited with your receiving antenna. I use a loop for LF receiving, and a 30 dB preamp. I leave the R-75 internal preamps off, as they pick up some "birdies" within the receiver. The resulting signal levels appear to be more than sufficient for serious LF work. This was the setup that I used last week to copy G3AQC on 73 kHz.
 
The R75 is a very nice receiver for the price, and one of my smarter buys.
 
John Andrews, W1TAG
----- Original Message -----
Sent: Wednesday, November 28, 2001 01:25
Subject: LF: ICOM R-75

Dear,
        I just bought a new IC R75 to replase an old FRG-100 and I'm looking for any modifications to improve the LF performance of the receiver.   Shematic diagram wasn't included with the manual.... It uses 10 DB or more attenuation below 1,6 MHZ.
Any help will be very useful to improve me LF instalation here.
Many thanks. Alex SV8QG