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[aprssig] BLENDING APRS: SEEMLESS INTEGRATION IN A MULTI-FREQUENCY ENVIRONMENT

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Sun Apr 18 01:35:43 UTC 2010


I've been thinking on a completely different but related question and 
have a possible suggestion to throw out on the table, but first...

You mentioned a discussion on "the nwaprssig reflector".  Is this an 
open forum, and if so, where can I join?

With the recent proliferation of Windows Mobile (APRSISCE), iPhone 
(iBCNU), Andoid (APRSdroid.org), and (hopefully soon) BlackBerry APRS-IS 
clients with internal tracking ability, I've been wanting RF awareness 
when one of these devices drives through my local area.  I'm considering 
adding an automatic "throttled" IGate capability to APRSIS32 that would 
detect APRS-IS-only devices, not heard on RF, within a configurable 
radius of the IGate which would then gate position beacons from -IS to 
RF at a configurable (and SLOW) rate with a very reduced path, just to 
have the RF environment become aware of the other stations in the area.

This same approach might work for cross-band digipeating between your 
various frequencies.

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

David Dobbins wrote:
> Now comes the problem we're attempting to resolve now, with our 
> BLENDED APRS DEVELOPMENT project. As it exists now, two mobile 
> travelers, one on the primary freq 144.39Mhz at 1200bd, and the other 
> on the secondary freq 144.35Mhz or 440.800Mhz at 9600bd, both driving 
> down I-5 equipped with Kenwood TM-D710 radios and AvMap G5 GPSs, 
> neither will know of each other's presence unless they're both 
> communicating on a common voice frequency. A nearby home station, 
> typically setup for the primary freq, will only see the one station 
> unless his APRS application, typically UI-View, is also pulling data 
> from the APRS-IS. Many don't, relying only on the RF picture plotted 
> on their screen. Another nearby home station, new and improved, but 
> monitoring only the secondary freq with a 96kb-only TNC, will see only 
> the one station unless his APRS application is also pulling data from 
> the APRS-IS. A third home station, pulling only the APRS-IS feed, may 
> see both stations while the fourth home station, with deeper pockets, 
> has UI-View running on his computer connected to a KPC-9612 and two 
> radios, one on 144.35Mhz or 440.800Mhz and the other 144.39Mhz.
>




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