[OZAPRS] 70cm APRS - was there a verdict?

[Darryl Smith]

Actually I think that things will get worse with the 9600 baud on UHF. The
problem is that you are changing frequency as well as speed. 

Rayleigh Fading occurs more as you go up in frequency... I cannot remember
the exact relationship between fading and frequency, but at best it is
linear meaning that there will be three times as much fading.

9600 is far more succeptable to this fading too... It would be good to
compare the performance of the 1200 and 9600... 

Darryl

---------
Darryl Smith, VK2TDS   POBox 169 Ingleburn NSW 2565 Australia
Mobile Number 0412 929 634 [+61 4 12 929 634 International] 
www.radio-active.net.au - www.radio-active.net.au\tracking
 

-----Original Message-----
From: ozaprs-bounces at marconi.ics.mq.edu.au
[mailto:ozaprs-bounces at marconi.ics.mq.edu.au] On Behalf Of Grant Willis
(VK5ZWI)
Sent: Sunday, 9 November 2003 11:51 PM
To: ozaprs at marconi.ics.mq.edu.au
Subject: [OZAPRS] 70cm APRS - was there a verdict?

Hi Everyone,

I am trying to find out if there was a verdict on what
70cm frequency should be used for APRS in VK. Also, in deciding
this, was any thought given as to what baud-rate this frequency
should run at?   

A couple of us in Adelaide are considering building a 9600 baud
70cm APRS WIDE digi and before I buy crystals, I would like some
certainty on this. Currently I am considering 439.100, assuming
that 439.175 is perhaps the 1200 baud channel? (and not wanting to
co-habit with this).

Also, why 9600 you might ask, well the Kenwood APRS ready radios
can all do 9600, and 9600 will better cope with the more rapid
mobile fading environment you find at 70cm. The lower incidences
of mobile electrical noise on 70cm might help things as well
when compared with 2m - esp with 9600 baud.

Regards,
Grant VK5ZWI


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