Return-Path: Received: (qmail 20784 invoked from network); 31 Aug 2001 00:30:58 -0000 Received: from unknown (HELO warrior-inbound.services.quay.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 31 Aug 2001 00:30:58 -0000 Received: (qmail 3653 invoked from network); 31 Aug 2001 00:29:11 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 31 Aug 2001 00:29:11 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15cc7R-0001UN-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 31 Aug 2001 01:25:09 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from mail9.wlv.netzero.net ([209.247.163.66]) by post.thorcom.com with smtp (Exim 3.16 #2) id 15cc7Q-0001UI-00 for rsgb_lf_group@blacksheep.org; Fri, 31 Aug 2001 01:25:08 +0100 Received: (qmail 12279 invoked from network); 31 Aug 2001 00:24:22 -0000 Received: from dialup-63.214.66.97.dial1.boston1.level3.net (HELO lazzo) (63.214.66.97) by mail9.wlv.netzero.net with SMTP; 31 Aug 2001 00:24:22 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3.0.3.32.20010830202245.01c5b25c@pop.netzero.net> X-Sender: w1jhj@pop.netzero.net X-Mailer: QUALCOMM Windows Eudora Pro Version 3.0.3 (32) Date: Thu, 30 Aug 2001 20:22:45 -0400 To: rsgb_lf_group@blacksheep.org, lowfer@qth.net From: "Jonathan Jesse" Subject: Re: LF: Re: Receiver/IC 746 In-reply-to: <3B8E1787.4FB4EC0D@usa.net> References: <003e01c130d4$30973360$7798fea9@host.telepac.pt> 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: >Don't have numbers for the IC-746, but a friend OM that owns one >tells me that it is deaf as a doorknob on the LF band. > >73 Alberto I2PHD I looked at the block diagram of my IC-746. It shows an attenuator that is switched in for Band 0 which is .03 to 1.6mhz. Further down the line, it shows another attenuator which is not switched. I then looked at the schematic for the RF unit and found the HF RX line. It comes to a relay that switches a 390 ohm resistor in and out. Further down is a what appears to be a pi attenuator composed of 2 100 ohm and 1 68 ohm resistors. The pi attenuator would figure to be 10db but I have no idea what the 390 ohm resistor offers for attenuation. Am I looking at this correct? Any and all help accepted and appreciated. 73, Jon W1JHJ Plymouth, MA FN41qw http://geocities.com/ws1k.rm ---------------------------------------------------- NetZero Platinum Sign Up Today - Only $9.95 per month! http://my.netzero.net/s/signup?r=platinum&refcd=PT97