[aprssig] -IS to RF Igating reloaded (Was: APRS on Android)

Stephen H. Smith wa8lmf2 at aol.com
Tue Jan 25 23:11:50 EST 2011

On 1/25/2011 6:47 PM, Lee Bengston wrote:
> On Tue, Jan 25, 2011 at 7:44 PM, Stephen H. Smith <wa8lmf2 at aol.com 
> <mailto:wa8lmf2 at aol.com>> wrote:
>     On 1/25/2011 2:31 PM, Earl Needham wrote:
>         Shucks, you can do this NOW.  Simply run a second instance of
>         UI-View, connected to the internet stream, but with a filter for
>         everything within, say, 20 miles.  Very simple.
>         Vy 7 3
>         Earl
>         KD5XB
>     Except that:
>     1)      The filter will put stuff on the local map.  It won't, by
>     default, transmit this stuff on RF though you could tweak igate.ini .  
>      Further, you would have to filter out position-less stuff like NWS
>     warnings, bulletins, etc.
>     2)      Dozens of igate stations along the itinerant mobile's route would
>     have to do this to achieve what the original poster wanted -- to make his
>     Internet-based mobile appear on local RF in one town after another as he
>     travels through different areas.
> Cool idea, though.  It opens up other possibilities such as transmitting 
> weather station data via internet only and still have it show up locally on 
> RF.  In that case one would only need one igate nearby his fixed location to 
> have the "reverse filter" in place.  Why transmit to IS only?  Could free up 
> a 2 meter rig for a different use.  Also it could be an easy solution for an 
> HOA that doesn't prevent a weather station from being installed in a back 
> yard but prohibits antennas on the roof.
> Lee - K5DAT
> Murphy, TX

For this application, it would be trivially simple in UIview.     Filter the 
port 14580 IS stream for the one weather station callsign in question. This 
could be a budlist ( b/callsign-nn)  in addition to any area or distance-based 
filtering already in place.    Then edit igate.ini  to enable reverse-gating 
for that specific callsign.   The once-every-10 mins beacon rate of a weather 
station should not be a burden on the local RF channel.

The complexity comes when you want to reverse-gate a mobile as it moves into 
and then out of the coverage of one igate, and then moves into the coverage of 



Stephen H. Smith    wa8lmf (at) aol.com
EchoLink Node:      WA8LMF  or 14400    [Think bottom of the 2M band]
Skype:        WA8LMF
Home Page:          http://wa8lmf.net

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