[amsat-bb] AMSAT-OSCAR 91 identified

Alan wa4sca at gmail.com
Wed Nov 29 18:52:05 UTC 2017


I get the same identification using a different technique.  While I haven't
had time to characterize the AO-91 transmitter frequency dependence on
temperature, in AO-85 is was about -62 Hz/degree C.  Looking at the changing
temperatures, that converts to about the same value in AO-91.



<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Nico
<Sent: Wednesday, November 29, 2017 08:30 AM
<To: AMSAT bbs <amsat-bb at amsat.org>; Ray Hoad
<<ray.hoad at mypbmail.com>
<Subject: [amsat-bb] AMSAT-OSCAR 91 identified
<Detailed doppler measurements show that AMSAT-OSCAR 91 (AO 91)
<is object 43017, 2017-073E.
<There is a small frequency drift on the downlink of OSCAR 91. During
<ascending passes, i.e. early afternoon passes from south to north, with
<the satellite in full sunlight, the downlink shows a frequency drift of
<about -19 Hz per minute.
<Nico PA0DLO
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