[aprssig] 9600 BAUD UHF APRS

[Bob Bruninga]

Mid Atlantic band plan (TMARC) has:
430.0 - 431.00 digitial 100 KHz channels
431.025-431.10 Digital 25 KHz channels

Bob, WB4APR


---- Original message ----
>Date: Fri, 18 Sep 2009 21:41:25 -0700
>From: aprssig-bounces at tapr.org (on behalf of Phil - AD6NH <ad6nh_lists at dslextreme.com>)
>Subject: Re: [aprssig] 9600 BAUD UHF APRS  
>To: TAPR APRS Mailing List <aprssig at tapr.org>
>
>   In Southern California, 440.800 is a repeater input
>   (445.800-), and 445.925 is 5 kHz off of a repeater
>   output (445.920-).  Unfortunately, neither of those
>   proposed frequencies will be usable in Southern
>   California.  We have been doing a little 9600 baud
>   APRS on 438.975 for several years though.
>
>   73
>   Phil - AD6NH
>   www.aprs2.net
>   www.aprsca.net
>
>   David Dobbins wrote:
>
>     Our experimentation with 9600 baud APRS in the
>     Puget Sound region for the past year + shows it
>     works, and works great. We have a dedicated 9600
>     baud APRS infrastructure growing on 440.800MHz and
>     will continue our development.
>     In a recent message with Bob WB4APR, re the
>     445.925 frequency.... he is recommending that as a
>     UHF voice coordination frequency for APRS, rather
>     than a data freq.
>     We will continue checking with our regional
>     coordination authorities in hopes of formally
>     designating 440.800 for 9600 baud APRS. In
>     reviewing the WWARA band plan for UHF, 440.800
>     does not fall into any category for other use, so
>     works well with our plans.
>     Feedback appreciated..... will 440.800 work
>     elsewhere in the country? We're hoping for a
>     single UHF frequency to continue development of a
>     9600 baud infrastructure.
>     For those of you in larger metro areas, when you
>     listen to 144.39 and all the packet activity, do
>     you seldom hear a pause between packets? If so,
>     you should pursue UHF 9600 baud development where
>     the packets are much shorter and propagation seems
>     to be working pretty darn good. We're having lots
>     of success with both D700/D710 and KPC-9612 w/Icom
>     or Alinco 9600 data radios for TNCs.
>     We also have a very successful 9600 baud VHF
>     infrastructure growing on 144.35 in the Puget
>     Sound region.
>     There's lots of room for more informational data
>     on a 9600 baud system, and our guru's are busy
>     exploiting that now.
>     Dave K7GPS
>     NWAPRS Lead Coordinator
>
>      ----------------------------------------------
>
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