Return-Path: Received: (qmail 32343 invoked from network); 8 Apr 2003 10:35:29 -0000 Received: from marstons.services.quay.plus.net (212.159.14.223) by mailstore with SMTP; 8 Apr 2003 10:35:29 -0000 Received: (qmail 22856 invoked by uid 10001); 8 Apr 2003 10:35:26 -0000 Received: from post.thorcom.com (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 8 Apr 2003 10:35:26 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.14) id 192qQT-0001p1-Uy for rsgb_lf_group-outgoing@blacksheep.org; Tue, 08 Apr 2003 11:34:01 +0100 Received: from [193.229.0.45] (helo=fep19-app.kolumbus.fi) by post.thorcom.com with esmtp (Exim 4.14) id 192qQN-0001op-RB for rsgb_lf_group@blacksheep.org; Tue, 08 Apr 2003 11:33:55 +0100 Received: from merocomp ([62.248.252.43]) by fep19-app.kolumbus.fi with SMTP id <20030408103354.WQBL3999.fep19-app.kolumbus.fi@merocomp> for ; Tue, 8 Apr 2003 13:33:54 +0300 Message-ID: <000701c2fdba$795bd100$1c076c0a@arenanet.fi> From: "Matti Niemela" To: rsgb_lf_group@blacksheep.org References: <191xgH-175wvYC@fwd10.sul.t-online.com> <5.1.0.14.2.20030404222503.009f79d0@mail.pncl.co.uk> <5.1.0.14.0.20030408102406.02f05cd0@u0019445.kuleuven.be> Date: Tue, 8 Apr 2003 13:34:45 +0300 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Re: Doppler shift Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=-12.9 required=5.0tests=ORIGINAL_MESSAGE,QUOTED_EMAIL_TEXT,REFERENCESversion=2.51 X-Spam-Checker-Version: SpamAssassin 2.51 (1.174.2.5-2003-03-20-exp) X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hello Rik, Based on my observations frequency shifts 1-2 Hz on 10Mhz are quite common during sunset and sunrise. During good daylight propagation shifts are much under 1 Hz via path of 500-2000 km. 73, Matti ,OH2ZT ----- Original Message ----- From: "Rik Strobbe" To: Sent: Tuesday, April 08, 2003 11:30 AM Subject: LF: Doppler shift > Hello group, > > The question is a bit off topic, so longwave-only readers can push the > delete button now. > > A friend of mine is interested in QRSS tests on 10.1MHz (30 meter) and one > of the things we are discussing is the longest useable dotlength is on that > frequency. Apart from TX (and RX) stabilty doppler shift due to ionospheric > refections will cause frequency instability. > Does anyone have an idea how much Hz the doppler shift can be on 10MHz ? > Is there any info available on the web ? > > 73, Rik ON7YD > >