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[aprssig] 9600? Faster?

Patrick Green pagreen at gmail.com
Thu Jul 7 13:34:54 UTC 2005


I plan on putting up a 9600 port for testing puposes in the western
suburbs of Chicago.  I need to get a KPC-9612 repaired and it'll be
ready to go otherwise.  Will be interesting to test.  I'm expecting
poor performance too.

73 de Pat --- KA9SCF.

On 7/7/05, Robert Bruninga <bruninga at usna.edu> wrote:
> >>> vk4tec at tech-software.net 07/07/05 3:13 AM >>>
> >I did some testing co-located 1200 and 9600
> >9600 does not seem to reach as far as 1200
> >mobile environmet harsh to 9k6 signals
> 
> Same here.  We did extensive tests with 4 different
> radios over 200 feet separation using lab attenuators
> and a very long run of RG58 to eliminate any chance
> of leakage.  The diffrence was 7 dB.  So it takes
> 50W at 9600 to equal 10W at 1200 baud.  Or
> about half the range.
> 
> And this does not inlude any differences due to multipath
> in the mobile environment...   I see no advantages at
> all to 9600 for APRS (except to use the 9600 baud
> satellite)...  Bob
> 
> -----Original Message-----
> From: Curt Mills [mailto:archer at eskimo.com]
> Sent: Thursday, 7 July 2005 3:55 PM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] 9600? Faster?
> 
> 
> On Wed, 6 Jul 2005, Phillip B. Pacier wrote:
> 
> > We've been doing some experiments in So Cal with 9600 APRS.  Frequency in
> use
> > here is 438.975.  Equipment generally being used on the digi/igate/home
> client
> > end is the KPC 9612, and mobiles use D7/D700 equipment.  Initial tests
> show
> > that it works better than most people will tell you.  I'll keep you
> updated.
> 
> Per Bob King, K7OFT, posted on the NWAPRS list just today:
> 
> "UHF APRS SYSTEM IN PUGET SOUND AREA IS ON 440.875 MHz Simplex 9600
> Baud."
> 
> That's in the Seattle, WA, area.  He also mentioned that it is
> important to adjust the deviation with a good service monitor to
> 3kHz.
> 
> 
> Bob Donnell, KD7NM, mentioned this:
> 
> "With several 9600 baud projects under our belts over the years,
> here in the Seattle area, we've found that +/- 2.75-3.00 kHz
> deviation to be the target range, when used with filters designed to
> work with a +/- 5 kHz deviation FM environment."
> 
> --
> Curt, WE7U.                             archer at eskimo dot com
> http://www.eskimo.com/~archer
>   Lotto:  A tax on people who are bad at math. - unknown
> Windows:  Microsoft's tax on computer illiterates. - WE7U.
> The world DOES revolve around me:  I picked the coordinate system!"
> 
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