[amsat-bb] A suggestion for Experimenter's Wednesdays on AO-91
jeff30339 at gmail.com
Fri Dec 15 14:55:18 UTC 2017
Yes, AO-85 has been transmitting SSTV every Wednesday for quite some time
On Friday, December 15, 2017, E.Mike McCardel <mccardelm at gmail.com> wrote:
> Maybe a question for engineering, but, can the cross band FM receivers
> aboard the LEO repeat SSTV and APRS? I think they don’t care if it’s voice
> or whatever.
> EMike McCardel, AA8EM
> Rotating Editor AMSAT News Service
> Sent from my iPhone
> > On Dec 15, 2017, at 9:40 AM, JoAnne K9JKM <joanne.k9jkm at gmail.com>
> > EMike mentioned:
> >> It seems to me that the limiting factor for using LEO satellites as an
> >> Emergency Response of any scale, would the short amount of time of a
> >> pass and the limited number of usable passes a day over an area needing
> >> response.
> > I agree, a verbal status report or request for assistance for an
> island-wide or city-wide disaster (think Puerto Rico and Houston) likely
> would not fit into the time for a LEO pass of a single satellite.
> > But, us ingenious ham radio operator types perhaps have the basis of
> sending compressed data which conveys a lot of information. Packed into the
> bytes of telemetry messages we find out about voltage, current, solar
> cells, temperature, etc. We use a predefined interface document to decode
> the string of bytes.
> > How about using a predefined disaster status data stream that all
> shelters (like scattered around an entire island) to encode 1) head count
> of staff 2) head count of victims 3) electrical power 4)drinking water 5)
> more supplies needed 6) need critical assistance. This way EOC staff could
> develop and maintain a system-wide status. Coordinating supplies or
> critical messages may also need better paths to complete than 10 minutes of
> satellite time.
> > We fill data warehouses with telemetry bytes as ground stations around
> the world receive those defined telemetry streams and forward them.
> Conversely, if multiple LEO satellites support a disaster-status protocol
> then EOC staff could receive more frequent updates (having to tune and
> track a different satellite though). In this case the EOC uses multiple
> satellites vs. one data warehouse with multiple users.
> > We'd need future cubesat missions capable of supporting a disaster
> telemetry stream. If we try something like this now it likely could see
> proof of concept with a single cubesat.
> > Hoping someday we'll replace this cubesat approach with the AMSAT Phase
> 4 groundstation. That will be like having a wireless phone line between an
> EOC and every shelter.
> > --
> > 73 de JoAnne K9JKM
> > k9jkm at amsat.org
> > _______________________________________________
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