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*Subject*: [amsat-bb] A doppler 2.4GHz question*From*: "Graham Shirville" <g.shirville@xxxxxxxxxxxxxx>*Date*: Thu, 16 Dec 2004 20:28:48 -0000

Hi All, We are still working on the possibility for a digital ATV installation for the ISS and this would probably use the DVB-S system and have a downlink in the 2400-2450MHz band. One of the questions being asked is about how robust the ground segment RX system would be in the presence of the doppler shifts that occur at that frequency. The next question that then comes is "what is the worse case - i.e. the maximum rate of change" for the received frequency? Now I know this will be when the ISS is approaching TCA on an overhead pass but I have no idea how to calculate the actual rate of change. Any help would be much appreciated. We know that Formula 1 racing cars coming to sudden stops is not a problem for their headcams and other digital cameras but this around a 700Hz per sec change and I suspect that we may be an order of magnitude more than that! cheers and happy holidays! 73 Graham G3VZV ---- Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

**Follow-Ups**:**Re: A doppler 2.4GHz question***From:*John Heath

**R: A doppler 2.4GHz question***From:*i8cvs

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