X-GM-THRID: 1229927722970530525 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.115.73.3 with SMTP id a3cs768893wal; Mon, 5 Mar 2007 03:35:31 -0800 (PST) Received: by 10.67.98.9 with SMTP id a9mr10505883ugm.1173094527614; Mon, 05 Mar 2007 03:35:27 -0800 (PST) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id g30si6704647ugd.2007.03.05.03.35.26; Mon, 05 Mar 2007 03:35:27 -0800 (PST) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1HOBQA-00062E-Nj for rs_out_1@blacksheep.org; Mon, 05 Mar 2007 11:32:02 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1HOBQA-000625-Av for rsgb_lf_group@blacksheep.org; Mon, 05 Mar 2007 11:32:02 +0000 Received: from vbn.0050420.lodgenet.net ([209.19.49.10]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1HOBQ9-0006fr-9H for rsgb_lf_group@blacksheep.org; Mon, 05 Mar 2007 11:32:02 +0000 Received: from [10.2.6.99] (helo=[10.2.6.99]) by vbn.0050420.lodgenet.net with esmtp (Exim 3.34 #1) id 1HOBQ8-0002vY-00 for rsgb_lf_group@blacksheep.org; Mon, 05 Mar 2007 03:32:00 -0800 Message-ID: <45EBFFB0.6000901@g3ysx.org.uk> Date: Mon, 05 Mar 2007 11:32:00 +0000 From: Stewart Bryant User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References:

In-Reply-To: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: QAP 500...how to get rid of attenuator on rigs... Content-Type: multipart/alternative; boundary="------------090108030908000404080308" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.0 required=5.0 tests=HTML_40_50,HTML_MESSAGE, HTML_TITLE_EMPTY autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Status: O X-Status: X-Keywords: X-UID: 2789 This is a multi-part message in MIME format. --------------090108030908000404080308 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit MIKE REID wrote: > Wolf, > > Try setting the rig to 499.99kc and use the RIT to go up into the > 501kc band. No more attenuator!!! That's what we do on 505-510kc here > in the US. > > > Is the RIT control a stable input to the frequency synthesizer? In some rigs it is a pot either directly driving an oscillator, or it is an ADC on the control processor where it is used as a poor mans digital input. RIT was originally intended to provide SSB offset, not the 1Hz class stability that is needed for QRSS. 73 Stewart G3YSX --------------090108030908000404080308 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit

MIKE REID wrote:

Wolf,

Try setting the rig to 499.99kc and use the RIT to go up into the 501kc band. No more attenuator!!! That’s what we do on 505-510kc here in the US.

Is the RIT control a stable input to the frequency synthesizer?

In some rigs it is a pot either directly driving an oscillator, or it
is an ADC on the control processor where it is used as a poor mans
digital input.

RIT was originally intended to provide SSB offset, not the 1Hz class
stability that is needed for QRSS.

73

Stewart G3YSX

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