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Re: ISS Packet Turned Off?



So basically ARISS / PCSAT2 are switched off for the same reasons that you
shouldn't leave your cellular 'phone switched on when on board a fly by wire
aircraft. It 'might' adversely affect the equipment with catastrophic
consequences. That said, there must be a shed load of other transmitting
equipment active during EVAs although this may be considered more 'flight
certified' that the amateur equipment. Perhaps a useful experiment would be
to get the successor of cosmonaut Ivan Ivanovich (SuitSat-1) to perform
long-term EVAs and monitor the effects of the onboard and outboard amateur
radio transmitters before he/she boldly goes ...

Félim M3HIM
----- Original Message ----- 
From: "Robert Bruninga" <bruninga@usna.edu>
To: <amsat-bb@amsat.org>; <nate@natetech.com>
Sent: Sunday, July 09, 2006 5:23 PM
Subject: Re: [amsat-bb] ISS Packet Turned Off?


> > Why does HAM radio need to be turned off during spacewalks?
>
> Well, its a long story...  As you recall, it didn't used to be...
>
> But when PCSAT2 was planned as a Ham Radio experiment
> on the outside of the Space Station, to be installed by
> a crew member during an EVA, from  day one, there were
> very stringent safety requirements that must be met
> in the vicinity of a space suit.
>
> PCSAT2 had to have FOUR independelty controllable "INHIBITS"
> to prevent transmission (could survive 3 failures and still not
> TX and endanger the spacesuit).  An indavertant transmission
> was considered a "Catastrophic Hazard" to the crew.  And all
> of this circuitry down to each transistor had to be briefed,
> reviewed, documented, approved and then re-briefed, re-reviewd,
> re-documented, and re-approved at 4 different levels over a
> span of 3 years at Space Station Safety Meetings which include
> dozens of skeptical NASA Safety engineers around a BIG table,
> taking a full day at a time.
>
> And this had to be coordinated with ARISS which coordinates
> all HAM activities on the space station...
>
> Well, with this scruitny and visibility to "ham radio" on the
> space station, it didnt take long for them to realize that there
> might not be such a paper trail in the NASA system for operating
> the other radios on board too.
>
> So, in the end, ARISS was also forced to shut down during
> all EVA's.  So unfortunately, it was PCSAT2 that brought on
> this new requirement.  But sooner or later, it was going
> to come up probably anyway...
>
> de Wb4APR, Bob
> ----
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