Re: [amsat-bb] SarSat Epirbs

["John M. Franke" <j.m.franke@xxxxxxxxxxxxx>]

Please see;

http://www.cospas-sarsat.org/download/download_frame.html

Look at G.003

By the way, the US SARSATs monitor 243 MHZ, the Russian COSPAS do not 
because the frequency is for military aircraft.  The above reference 
discusses the LEO and GEO satellite systems.

John  WA4WDL

At 12:21 AM 10/20/2002 -0400, you wrote:
>I know this isn't an amateur satellite question but I thought that the folks
>with expertise in this field would be on this list and  have the answer.  As
>this isn't amateur satellite related please reply to me off list.
>
>I know that leo satellites monitor the epirb and elt frequencies of 121.5,
>243.0 and 406.125MHZ for emergency beacons from downed ships and aircraft.
>I read that the new 406 epirb frequency will have the capability of sending
>data from the new gmdss epirbs that broadcast distressed ships and aircrafts
>locations, usually linked to their gps systems.  Are the satellites
>listening for this traffic bent-pipe systems that dump this information down
>in real-time or are they store and forward systems.  A technical description
>of this system would be appreciated.  What downlink frequencies do the
>satellites use?  Are they all leo systems or do such systems listen from geo
>orbit as well?  How is this information collected from the early generation
>of satellites on 121.5 and 243.0.  How are locations pinpointed in the early
>generation of birds that only receive the older style of elt/epirbs?  I know
>through my research on the net and as an amateur satellite enthusiast that
>amateurs pioneered direction finding from satellites using Oscar-7.
>
>Any information would be appreciated.
>
>
>
>Dave Marthouse N2AAM
>dmart@lynchburg.net
>
>
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