[aprssig] Satellite positions: FREQUENCY

John Ronan jpronans at gmail.com
Wed Oct 19 02:51:06 CDT 2011

On 19 Oct 2011, at 02:06, Lynn W. Deffenbaugh (Mr) wrote:

> 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.
Not quite, configure once, then leave it alone.  I have scripts in place that load new keps every day. 

Sure, it would have to be restarted to add a new satellite, but I've not done that since it was installed.


> 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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