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[aprssig] APRS in Atlanta

Mark Earle wa2mct at mearle.com
Wed Oct 12 12:41:41 UTC 2005


At 06:48 AM 10/12/2005 -0500, Steve Slay wrote:
>>"Why would anybody need more hops than what it takes to get to an Igate?"
>
>I guess I didn't make my answer as clear as I thought.
>
>Position reports to RF stations in areas beyond the number of hops it 
>takes to get to an Igate.
>
>After all, the "P" in APRS does stand for "Position".


A practical example, sort oflike the OK Skywarn cited earlier:

I am talking to several folks on an extended linked system. (There are two 
that cover much of the state of Texas). My buddy is running an APRS Client 
in his vehicle, so will only see my posits via RF - his car PC is not 
connected to the Internet. So I go more than two hops in this circumstance.

We've also done public safety events that cover 80-100 miles per day 
(MS-150 bike ride, Houston to Austin, over 10,000 riders and 200 miles!). 
The race managers love knowing where various key assets are. Again, takes 
more than two hops.

Motorola Marathon, Austin. Gets by with as I recall, JUST two hops, but has 
event-specific digipeaters set up, and is not on 144.39, although some of 
the event activity is gated to the APRS-IS. Again, it may go to 3 hops if 
needed.. the topography of the event area sometimes "uses up" your hops 
with only two, before the packets get to an IGATE or DIGI so the race 
managers can have the information needed.


>Steve Slay
>KC5MVY
>"Only two things are infinite, the universe and human stupidity, and I'm 
>not sure about the
>former."    Albert Einstein
>
>
>
>----- Original Message ----- From: "N0YXV - Stan Coleman" <n0yxv at gihams.org>
>To: "'TAPR APRS Mailing List'" <aprssig at lists.tapr.org>
>Sent: Wednesday, October 12, 2005 1:28 AM
>Subject: RE: [aprssig] APRS in Atlanta
>
>
>>I've gotten some replies that suggest you need RF but so far know body
>>has suggested a need for RF that goes beyond the WIDEn-N standard. I
>>guess I didn't make my question as clear as I thought. Emails great but
>>it doesn't always get the point across the first time. My question
>>should have been more along the lines of, "Why would anybody need more
>>hops than what it takes to get to an Igate?" I'm not trying to start a
>>flame war just wondering why some people don't seam to like WIDEn-N and
>>claim they need somethingng more than it provides.
>>
>>>-----Original Message-----
>>>From: aprssig-bounces at lists.tapr.org
>>>[mailto:aprssig-bounces at lists.tapr.org] On Behalf Of M. Schneider
>>>Sent: Wednesday, October 12, 2005 12:03 AM
>>>To: aprssig at lists.tapr.org
>>>Subject: Re: [aprssig] APRS in Atlanta
>>>
>>>
>>>  > Message: 15
>>> > Date: Mon, 10 Oct 2005 17:44:36 -0500
>>> > From: Stan Coleman [N?YXV] <n0yxv at gihams.org>
>>> > Subject: Re: [aprssig] APRS in Atlanta
>>> > To: TAPR APRS Mailing List <aprssig at lists.tapr.org>
>>> > Message-ID: <1128984276.434aeed4b74cf at www3.srcproductions.com>
>>> > Content-Type: text/plain; charset=ISO-8859-1
>>> >
>>> > /snip/
>>> > Please don't take this the wrong way I'm merely trying to get more
>>> > information.
>>> > But name one connection where you NEED to use RF instead of
>>>letting the
>>> > internet help the packet along.
>>> >/snip/
>>>
>>>One example, not at random:  Here in Oklahoma, both the
>>>Norman and Tulsa NWS
>>>Forecast Offices have APRS displays, and in fact, the Tulsa
>>>office can
>>>overlay the APRS positions on their Nexrad radar displays.
>>>In combination
>>>with two extensive linked repeater systems, spotters across
>>>the state can
>>>send in eyeball reports of severe weather activity and if they are
>>>APRS-equipped, the forecasters can see exactly where they
>>>are, and even
>>>compare their observations with what they are seeing on the
>>>WSR-88D.  As any
>>>NWS meteorologist will tell you, such "ground truth" reports
>>>from trained
>>>spotters are vital.  But the catch is, many of these spotters
>>>are going to
>>>be more than two hops from the NWS FO.
>>>
>>>When I get the STLWTR digi reprogrammed (hopefully later this
>>>month), it
>>>will support WIDE3-3 as well as OKx-x, so that these spotter
>>>locations stand
>>>a better chance of making it to Tulsa and Norman.  The
>>>traffic level in
>>>Oklahoma is sufficiently low that I believe the system will
>>>support the
>>>additional hop from a digi that is located nearly in the
>>>middle of the
>>>state.  At a later time, it may be necessary to lower the
>>>path.  I might add
>>>that most of the Igates are in the Tulsa and Oklahoma City
>>>area, so getting
>>>a position to an Igate is essentially the same as getting it
>>>to the forecast
>>>offices via RF.
>>>
>>>Mark Schneider - K5MAR
>>>Control Op - STLWTR Digi  (K5SRC-1)
>>>
>>>
>>>
>>>
>>>_______________________________________________
>>>aprssig mailing list
>>>aprssig at lists.tapr.org
>>>https://lists.tapr.org/cgi-> bin/mailman/listinfo/aprssig
>>
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       ) )    de WA2MCT Mark
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       ) )    You will be assimilated... oooh, coffee!!
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