[aprssig] Satellite positions: FREQUENCY

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Tue Oct 18 20:06:57 CDT 2011

The DIGI_NED model only works when directly connected to local RF.  And 
that requires local operators to do the configuration and maintenance to 
keep it going.

I'm trying to offer a globally-accessible satellite information 
service.  I'm not trying to replace what DIGI_NED has accomplished at 
the local level, but provide something new and functional from a much 
broader perspective and service area.  And without QRMing the local RF 
channel when no-one is listening.

There is no way in APRS for a central server to push information out to 
a local RF APRS network except by sending an APRS message directed to a 
station that was recently heard local to an IGate.  And the only way to 
reliably know that is to design and implement a centralized query / 
response system.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 10/18/2011 7:41 PM, Bill Vodall wrote:
>> I still believe that the best possible use is to query when you think you've
>> got time to work the satellite.
> I have to come back to the DIGI_NED model.   One packet per bird every
> 10 minutes with the next predicted AOS (or something) time.  Then when
> it's in range, one packet a minute with current information.
> It's surprising how one finds the time to bounce a few packets through
> a bird or listen to the channel when it just happens to be opportune.
> DIGI_NED has the poll feature.  Used it once to verify it works and
> never went back.
> 73
> Bill - WA7NWP
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