[amsat-bb] A suggestion for ... Emergency Comms - APRS...

David Johnson david.johnson.bbq at gmail.com
Fri Dec 15 15:11:08 UTC 2017

Yes, but what does Bob Bruninga know about APRS? :) LOL...

Dave, W9DWJ

On Fri, Dec 15, 2017 at 9:03 AM, Robert Bruninga <bruninga at usna.edu> wrote:

> Such a highly compressed method of satellite encoding exists called APRS.
> >> ... 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...
> > 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 ...
> > How about a predefined disaster status data stream that all shelters...
> Use the APRS Object for a SHELTER.  Just one packet can contain the
> position, time and date of the report, and up to 47 bytes of useful info
> such as 1) head count of staff 2) head count of victims 3) electrical
> power 4)drinking water 5) more supplies needed 6) need critical
> assistance.
> > Conversely, if multiple LEO satellites support a disaster-status
> protocol..
> They do.  APRS is currently on 3 sateliltes... PSAT, ISS and PCSAT and
> soon to be QIKCOM2 and PSAT2 and BRICSAT2... And TJHS hicghschool cubesat,
> etc
> > We'd need future cubesat missions capable of supporting a disaster
> telemetry stream.
> We have it.  See the SATT4 single card APRS transponder.  We invite every
> school or university that is contemplating a CUBESAT to consider using
> this transponder for their command and control which also provides the
> APRS transponder as well.  Cost is under $300 or so.
> See http://aprs.org/satt4.html
> Bob, WB4aPR
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David Johnson

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