[OZAPRS] 70cm APRS

[Darryl Smith]

I think a 9600 bps UHF APRS frequency is not a great idea.

The reason is that each APRS transmission at 1200 bps takes about 1 second.
Most of this is the TxDelay. The TxDelay on UHF is commonly the same, so you
might go from 1000 mSec to 600 mSec. This is not much of an improvement.

But since you are transmitting at 8 times the speed, and so this is the
equivalent of only transmitting 1/8th the power. Your 9600 bps 24 Watt radio
becomes a 8 Watt 1200 bps radio.

Darryl

-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Peter Schrader
Sent: Thursday, 22 May 2008 10:59 PM
To: VK / ZL APRS Users
Subject: [OZAPRS] 70cm APRS

Hello all,
What does everybody think about having a dedicated frequency for 9k6
APRS on UHF?

Next question, could we all agree on a nationwide frequency?

Regards,
Peter Schrader,
VK4TGV/9V1PS
Redcliffe and Districts Radio Club
Singapore Amateur Radio Transmitting Society
WIA Assessor 4-055

APRS - VK4TGV-12, VK4TGV-7, VK4TGV-2 and 9V1PS
ALE HFN Pilot Station - http://hflink.com




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