[amsat-bb] FINALLY -- STMsat-1 lack of signals explained

John Brier johnbrier at gmail.com
Wed May 18 18:48:12 UTC 2016

Don't know about that but Emily Stocker, who seems to be one of the
main parties involved said the following:

Kevin Zari: Emily, does the ground have the ability to command
anything to the satellite, or is it truly just a "it turns on and
works, or doesn't" satellite. Please note, I have experience in
troubleshooting space payloads.

Emily Stocker: No, we cannot communicate with it

Kevin Zari: presently ? or the capability doesn't exist?

Emily Stocker: As I said above, no telemetry. We are sending radio
signals from the satellite to earth. Nothing from earth to satellite.


Speculation but, maybe a shut down command is the only thing that can
be sent to it?


On Wed, May 18, 2016 at 2:42 PM, Bob <WB4SON at gmail.com> wrote:
> Still might be speculation about no uplink capability.  It is entirely
> possible that things are programmed to remain off until the spin stabilizes.
> And given statements that the antennas would deploy in 45 seconds, that
> doesn't sound like the sun is melting anything -- it might be a resistive
> wire that is heating the glue.  Of course information like that would be
> nice to know and it would help others in the future.
> There was correspondence to NASA indicating it had some uplink capability.
> Quoting the letter sent to the NASA mission manager:
> 1. Structure
> 2. Radio
> 3. Solar Arrays (5, body mounted)
> 4. Power System
> 5. On-board Computer
> 6. Deployable Antenna
> 7. Camera
> 8. School Payload (cross blessed by the pope)
> "The spacecraft will be launched into LEO (400 km) from the International
> Space Station (ISS) in early December 2015. The antenna will deploy 45
> minutes after deployment from the ISS. The spacecraft will take a photo of
> Earth every 30 seconds and will transmit it via the amateur radio band (slow
> scan television). If required, the spacecraft “shut down” command would be
> sent via the NASA Near Earth Network."
> Fingers crossed that its just a matter of time.
> 73, Bob, WB4SON

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