Return-Path: Received: (qmail 27480 invoked from network); 16 Apr 2002 09:14:05 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 16 Apr 2002 09:14:05 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 29526 invoked from network); 16 Apr 2002 09:14:04 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 16 Apr 2002 09:14:04 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16xQOJ-0003a6-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 16 Apr 2002 11:40:51 +0100 Received: from e1.ny.us.ibm.com ([32.97.182.101]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16xQOI-0003a1-00 for rsgb_lf_group@blacksheep.org; Tue, 16 Apr 2002 11:40:50 +0100 Received: from northrelay01.pok.ibm.com (northrelay01.pok.ibm.com [9.56.224.149]) by e1.ny.us.ibm.com (8.12.2/8.12.2) with ESMTP id g3G92Cms048754 for ; Tue, 16 Apr 2002 05:02:12 -0400 Received: from usa.net (ss5.bld.socks.ibm.com [9.14.4.70]) by northrelay01.pok.ibm.com (8.11.1m3/NCO/VER6.1) with ESMTP id g3G92A318750 for ; Tue, 16 Apr 2002 05:02:10 -0400 Message-ID: <3CBBE887.F0D0D223@usa.net> Date: Tue, 16 Apr 2002 11:01:59 +0200 From: "Alberto di Bene" X-Mailer: Mozilla 4.79 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Phase meter for propagation experiment References: <3CBB4AFD.30D47C43@virgin.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Stewart Bryant wrote: > [...] > Thus the phase measurements must be made wrt an analogue > TV transmission. > [...] What about analogue TV via Astra satellite ? There are dozens of analogue channels on this bird, and I am told some of them have very precise synch pulses. Would the relaying through satellite spoil their precision ? The satellites, while geostationary, are not exactly at a relative rest wrt the earth. They are wandering back and forth, with the small onboard jets correcting this movement. I don't have enough info on the rate of change of their speed to be able to evaluate the amount of the Doppler effect. 73 Alberto I2PHD