[amsat-bb] A suggestion for Experimenter's Wednesdays on AO-91
mccardelm at gmail.com
Fri Dec 15 14:50:26 UTC 2017
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> wrote:
> 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 given
>> pass and the limited number of usable passes a day over an area needing the
> 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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