Member
  SO-50 SAUDISAT-1C

*** New information ***

Control Operator Information Released to Public

From: <VEFRH@aol.com>
To: <amsat-bb@AMSAT.Org>; <Advisors@AMSAT.Org>; <bod@AMSAT.Org>
Subject: [amsat-bb] AO-50 correction to SO-50
Date: Thursday, June 10, 2004 10:56

Greetings again,
The message should have read as below .... I must be getting old (er) that  
is about 3 times in 3 days.
73
Robin Haighton VE3FRH
President AMSAT-NA
 
Greetings,
I have been advised that I can now publish the tone to Open  SO-50 to all  
users as the power availability appears to be good.
To  switch the transmitter on you need to send a CTCSS tone of  74.4   Hz.
the order of operation is thus:
 
(allow for Doppler as necessary)
 
1) Transmit on 145.850 MHz with a tone of 74.4 Hz to arm the 10  minute  
timer on board the spacecraft.
 
2) Now transmit on 145.850 MHz  (FM Voice) using 67.0 Hz to PT  the  repeater 
on and off within the 10 Minute window.
 
3) Sending the 74.4 tone again within the 10 minute window will reset  the  
10 minute timer.
 
Some additional information ...
 
The spacecraft repeater consists of a miniature VHF repeater with a   
sensitivity of -124 dbm, having an IF bandwidth of 15 KHz. The receive  
antenna  is a 1/4 wave vertical mounted in the top corner of the  spacecraft.
The receive audio is filtered and conditioned then gated  in the control electronics 
prior to feeding it to the 250 mW  Transmitter. The downlink antenna is a 1/4 wave 
mounted in the bottom corner  of the spacecraft and canted at 45 degrees inward.
 
73
Robin Haighton VE3FRH
President AMSAT-NA
----
Via the bod  mailing list at AMSAT.ORG courtesy of AMSAT-NA.

----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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Uplink: 145.850 MHz (67.0 Hz PL tone)
Downlink: 436.800 MHz at 250mw of power
Launched: December 20, 2002 aboard a converted Soviet ballistic missile from the Baikonur Cosmodrome.

SO-50 carries several experiments, including a mode J FM amateur repeater experiment operating on 145.850 MHz uplink and 436.800 MHz downlink. The repeater is available to amateurs worldwide as power permits, using a 67.0 Hertz tone on the uplink, for on-demand activation.

The repeater consists of a miniature VHF receiver with sensitivity of -124dBm, having an IF bandwidth of 15 KHz. The receive antenna is a 1/4 wave vertical mounted in the top corner of the spacecraft. The receive audio is filtered and conditioned then gated in the control electronics prior to feeding it to the 250mW UHF transmitter. The downlink antenna is a 1/4 wave mounted in the bottom corner of the spacecraft and canted at 45 degrees inward.

Note

I have found the downlink of SO-50 after launch to be 436.796 MHz

See also: 

http://www.amsat.org/amsat/sats/n7hpr/so50.html

AO-49 & SO-50 photos

Calling CQ - January 3, 2003 - 0756 UTC - (MP3 | MP3)