Hello,
On the weekend, during one of the XW-1/HO-68 passes schedulle for change the "beacon/TLM only" to "beacon/TLM + FM repeater" mode, It was clear the temporarily interruption of TLM data flow for their quickly return from the beggining of the TLM frame with new status, exactly on the time combined. So CE3RR was well heard in FM downlink.
My neophyte question is: The satellite was over Chile that time. Do we need an earth ground station in South America, inside the footprint of the satellite, to send the operational changing command to the bird for HO-68 real time answer to the request or only the Chinese controler sent the command, for satellite store the information and, at appropriated time, far way from Asian footprint, HO-68 active the ordered?
Flavio PY2ZX
Flavio,
We upload programm command to the satellite when the satellite pass Chinese airspace, and then the satellite act the order at appropriated time.
73 Alan, BA1DU
----- Original Message ----- From: "PY2ZX" py2zx.ham@gmail.com To: amsat-bb@amsat.org Cc: hearsat@mailman.qth.net Sent: Tuesday, December 22, 2009 11:06 PM Subject: [amsat-bb] HO-68 (changing modes, commands)
Hello,
On the weekend, during one of the XW-1/HO-68 passes schedulle for change the "beacon/TLM only" to "beacon/TLM + FM repeater" mode, It was clear the temporarily interruption of TLM data flow for their quickly return from the beggining of the TLM frame with new status, exactly on the time combined. So CE3RR was well heard in FM downlink.
My neophyte question is: The satellite was over Chile that time. Do we need an earth ground station in South America, inside the footprint of the satellite, to send the operational changing command to the bird for HO-68 real time answer to the request or only the Chinese controler sent the command, for satellite store the information and, at appropriated time, far way from Asian footprint, HO-68 active the ordered?
Flavio PY2ZX
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Thanks a lot Alan and David,
I made very simple graphics of XW-1 elevarion x time; beacon freq received x time; beacon power output decoded from TLM x time. Not sure If is usuall but It seems that the beacon power raised from 80 mW to 175 mW in 3 minutes of monitoring.
They are at: http://archangelo.net/misc/sat/xw-1/view.htm
73!
Flavio PY2ZX
participants (2)
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Alan Kung -
PY2ZX