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Re: SO-50 downlink frequency



2 reasons come to mind. One frequency may be the pre-launch coordinated frequency, the other the "observed" frequency. Crystals and other components change with time and temperature regime, and transmitters and receivers may drift. Secondly, SO-50 has been observed to rapidly "jump" or shift several kilohertz in frequency at times, for unknown reasons. 

Keep in mind that we are very fortunate that the builders of SO-50 decided to incorporate this repeater into their spacecraft, and especially so that they have made the amateur operation mostly autonomous and always available. It's a fine satellite, enjoy it. 

73, Drew KO4MA


-----Original Message-----
From: iain.mcfadyen@cwjamaica.com
Sent: Apr 5, 2005 4:44 PM
To: amsat-bb@AMSAT.Org
Subject: [amsat-bb] SO-50 downlink frequency

Can anyone explain why some reference material refers to the SO-50 downlink as 436.800 and others as 436.795?

The Amsat status page even refers to both in the same status report:

<Quote>
Saudi-OSCAR 50/SaudiSat 1C   (SO-50) 
Uplink 145.850 MHz FM 
Downlink 436.795 MHz FM 
Launched 20 December 2002 

Status:  Operational
SO-50 carries several experiments, including a mode J FM amateur repeater experiment operating on 145.850 MHz uplink and 436.800 MHz downlink. 
<UnQuote>

Iain     KI4HLV   Washington DC
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