[OZAPRS] FW: [aprssig] Future of 144.39

[Richard Hoskin]

Hi Everyone,

I found this on the APRS Sig and thought it to be topical, especially for
VK3 around Melbourne.

I have always though it would be great if we could get a number of small
APRS cells linked via the internet. To manage traffic levels within these
small cells distanced based filters would be used which would only Gate
Internet traffic within X distance from the ARPS cells transmitter.

Most of the software is already available, the difficult part is finding
permanent internet access or if using a UHF backbone finding the
additional
equipment required for the cells.

Changing Amateurs ideas about the principle of higher is better... and
more
power is better is also be a challenge.

Cheers
Richard.


-----Original Message-----
From: bounce-aprssig-31278 at lists.tapr.org
[mailto:bounce-aprssig-31278 at lists.tapr.org]On Behalf Of Bob Bruninga
Sent: Friday, 10 January 2003 07:25
To: TAPR APRS Special Interest Group
Cc: TAPR APRS Special Interest Group
Subject: [aprssig] Future of 144.39


> Of course the very long term outlook for 144.39 doesn't look good,
> as long as APRS keeps getting more popular.

Nah,  just make the cells smaller.  In HAM radio terms, this means lower
and less coverage for each digi, and then have it linked to either the
internet or a UHF backbone.  Just like cellular, just keep making the
cells smaller and you can always accomodate more.

I'd say there is still an order of magnitude more growth potential or
more.  But it is a learning curve, because it violates the HAM principle
of higher is better...

If you dont believe me, draw a 5 mile circle around your mobile.
Easier still, go to FINDU and click on nearby stations.  That is
your reliable mobile coverage to another mobile or local station (with
nominal home station HAAT).  How many folks are in that circle?
Our area is pretty good APRS wise and I see 5 stations within 5 miles,
16 more within 10 miles and a total of only 32 within 20 miles.

144.39 can very easily provide good communications for those people.
but not when I am also seeing every packet from everyone out 150 miles in
all directions.  But all that stuff should be on the backbone, not on
144.39...

Here is a GREAT PROJECT for someone!
Monitor APRS-IS and gather statistics for all the stations that are DIRECT
to all the DIGIS.  Then plot the number of stations per digi and sort.

Now we know the busiest and quietest digis.  Then the rest of use can look
at where OUR LOCAL DIGI fits in this sort and can have a good feel of
how OUR LOCAL CHANNEL compares to the performance of someone elses, just
by comparing their digi.

Next, plot this as a function of HAAT...
That will really tell you how well your digi is performing...

 etc..

Bob, WB4APR





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