[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Saudisat 1C availability



I have some confusion about how this bird really works.  The AMSAT weekly
satellite report suggests:

   SO-50 SAUDISAT-1C
   Uplink:         145.850 MHz (67.0 Hz PL tone)
   Downlink:       436.800 MHz 
   Launched: December 20, 2002 aboard a converted Soviet ballistic
   missile from the Baikonur Cosmodrome. Status: Operational.

   SO-50 carries several experiments, including a new 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.

   [ANS thanks Turki Al-Saud for this information]

			 -- http://www.amsat.org/amsat/ftp/news/2003/wsr019.txt

However, the original report on the commissioning of SO-50 said:

   Robin informed the AMSAT-BB readers that, "This satellite will require
   activation on each pass by a designated control operator.  A worldwide
   network of designated control operators is now being developed so that Radio
   Amateurs may begin using the satellite immediately."  He continued, "You
   will note however that a 67.0 Hz tone is required to switch on the satellite
   when uplinking. The purpose of this is to try and remove annoying
   interference. You will note that the operational Frequencies are the same as
   AO-27. We expect that the satellite will receive an OSCAR Number within a
   few days."

   [ANS thanks Turki Al Saud and Robin, VE3FRH for the above information]

			 -- http://www.amsat.org/amsat/ftp/news/2003/ans005.txt

Clearly SO-50 requires a 67.0 Hz PL to access the uplink, and the mode J-FM
frequencies are the same as the original frequencies for AO-27.  

Several questions remain:

* Is there additional actions necessary on a per-pass basis to make the bird
  available, or has that now been programmed into the satellite so that only
  a 67 Hz is necessary to activate mode J-FM (power permitting)?

* If it is not currently programmed into the satellite, is it currently being
  activated automatically by a ground station, or manually?

* In either case, does that mean the satellite may not be accessible outside
  of the range of a designated control operator (or if a nearby control
  operator is not on the air for some reaon)?

Hopefully someone here knows the answer and we don't have to bother the 
folks in Saudi Arabia who have been so kind as to develop and make these
satellites available.
			        -- KD6PAG
----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home