X-GM-THRID: 1229927722970530525 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.115.73.3 with SMTP id a3cs1022100wal; Tue, 6 Mar 2007 20:52:58 -0800 (PST) Received: by 10.67.28.4 with SMTP id f4mr3334465ugj.1173243177879; Tue, 06 Mar 2007 20:52:57 -0800 (PST) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id l33si1161728ugc.2007.03.06.20.52.56; Tue, 06 Mar 2007 20:52:57 -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 1HOo6O-0005Ns-Go for rs_out_1@blacksheep.org; Wed, 07 Mar 2007 04:50:12 +0000 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1HOo6N-0005Nj-VV for rsgb_lf_group@blacksheep.org; Wed, 07 Mar 2007 04:50:12 +0000 Received: from bay0-omc3-s24.bay0.hotmail.com ([65.54.246.224]) by relay2.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1HOo6J-0005cO-H3 for rsgb_lf_group@blacksheep.org; Wed, 07 Mar 2007 04:50:11 +0000 Received: from hotmail.com ([207.46.8.151]) by bay0-omc3-s24.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2668); Tue, 6 Mar 2007 20:50:00 -0800 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 6 Mar 2007 20:49:59 -0800 Message-ID: Received: from 207.224.74.194 by BAY118-DAV13.phx.gbl with DAV; Wed, 07 Mar 2007 04:49:58 +0000 X-Originating-IP: [207.224.74.194] X-Originating-Email: [we0h1@msn.com] X-Sender: we0h1@msn.com From: "MIKE REID" To: References: <45EBFFB0.6000901@g3ysx.org.uk> <45ED0624.8080001@g3ysx.org.uk> Date: Tue, 6 Mar 2007 22:49:58 -0600 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.50.0034.2000 Seal-Send-Time: Tue, 6 Mar 2007 22:49:58 -0600 X-OriginalArrivalTime: 07 Mar 2007 04:49:59.0977 (UTC) FILETIME=[0FBB8990:01C76074] X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,AWL=0.030,HTML_MESSAGE=0.001,MSGID_FROM_MTA_HEADER=0 Subject: Re: LF: QAP 500...how to get rid of attenuator on rigs... Content-Type: multipart/alternative; boundary="----=_NextPart_000_04FA_01C76041.C41994A0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.6 required=5.0 tests=FROM_HAS_MIXED_NUMS,HTML_40_50, HTML_MESSAGE,MISSING_OUTLOOK_NAME,MSGID_FROM_MTA_HEADER 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: 2785 This is a multi-part message in MIME format. ------=_NextPart_000_04FA_01C76041.C41994A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable A pot. Hmmm wonder why Kenwood used such a simple component rather than = the optical encoder scheme? Mike WE0H From: Stewart Bryant On the TS850 the RIT is a variable resistor not an encoder (It's VR6 on the SW_A board). It is normal for this arrangement to go to an ADC on the processor which then controls the synthesizer - adding or sutracting a nominal amount from the frequency set by the main dial. Therefore RIT will only be as good as the stability of the pot = (mechanical and electrical) and the stability of the supply voltage. 73 Stewart G3YSX ------=_NextPart_000_04FA_01C76041.C41994A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
A pot. Hmmm wonder why Kenwood used such a simple component rather = than the=20 optical encoder scheme?
 
Mike
WE0H
 
From: Stewart = Bryant

On the=20 TS850 the RIT is a variable resistor not an encoder (It's
VR6 on = the SW_A=20 board). It is normal for this arrangement to go
to an ADC on the = processor=20 which then controls the synthesizer
- adding or sutracting a = nominal amount=20 from the frequency set
by the main dial.

Therefore RIT will = only be=20 as good as the stability of the pot (mechanical
and electrical) and = the=20 stability of the supply voltage.

73 Stewart=20 G3YSX

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