[aprssig] radio aprs vs internet aprs

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Tue Mar 20 09:06:19 CDT 2012

And for a good introduction on why your APRS message may or may not make 
it across the -IS/RF boundary, read:


It talks about -IS to -IS messaging (nearly always works), RF to RF 
messaging (works if you're in simplex or digipeater range), as well as 
RF to -IS to RF (least reliable as it requires properly configured 
(read: transmitting) IGates on both ends).

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

On 3/20/2012 9:45 AM, Mike Goldweber wrote:
> Hi Eric,
> This makes sense, and it clarifies some other observations I've made 
> recently.  Thank you very much for explaining it.  This gives me some 
> more things to explore.
> Sincerely,
> Mike
>     -------- Original Message --------
>     Subject: Re: [aprssig] radio aprs vs internet aprs
>     From: Eric Lorenz K9LGE <k9lge at emlorenz.com
>     <mailto:k9lge at emlorenz.com>>
>     Date: Tue, March 20, 2012 9:35 am
>     To: TAPR APRS Mailing List <aprssig at tapr.org
>     <mailto:aprssig at tapr.org>>
>     Hi Mike,
>     No problem...when you use APRSDroid, you are connected to what is
>     called APRS-IS. Is it basically as you describe ...a set of APRS
>     nodes connected over the internet. By default, APRS-IS is separate
>     from the RF side of APRS. There are stations that may choose to
>     gate -IS traffic over to local RF (usually a limited stream- when
>     users are passing within a certain radius of a station, so locals
>     can see all traffic). Usually it is more the other way
>     around...where the RF side is getting gated to IS. You will find
>     here a great...'diversity' of opinion on the merits of mixing RF
>     and IS APRS traffic. Personally, under controlled guidelines, I
>     think it is beneficial to do so. But I  am only one opinion here.
>     :-). So that is why you don't by default see your traffic come up
>     on local RF...you only will if there is someone reverse-gating
>     your traffic to RF.
>     Eric K9LGE
>     On Mar 20, 2012 8:24 AM, "Mike Goldweber" <mike at mikegoldweber.name
>     <mailto:mike at mikegoldweber.name>> wrote:
>         Hi Everyone,
>         On Saturday volunteered at a 5K race to help with the
>         communications support.  While I was sitting in my car waiting
>         for the race to begin, I thought it might be fun to turn on
>         the APRSDroid app to see if any of the other volunteers would
>         appear on my display.  Several did, which was exciting (bear
>         with me, I'm new to all aspects of digital radio).  So, I
>         decided to go a step further and I attempted to send a message
>         through the application.  Apparently the message did and did
>         not get through.
>         The next day I ran into the guy who organized and ran the
>         communications.  He told me that he got the message when he
>         linked his system to the internet, but during the race he
>         comm's trailer was not linked to the internet, which is why he
>         did not receive my message immediately.
>         So I'm a little confused.  I can imagine a pure internet set
>         of links (and displayed nodes), and I can imagine a set of
>         pure radio linked nodes.  I am a little confused about what
>         seems to be a partial mix of internet or radio nodes.  Could
>         someone please explain the mechanics of this to me?
>         Thanks,
>         Mike Goldweber
>         KB3IXO
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