[OZAPRS] VHF to HF Gateway for portable use ?

[Michael Zwingl, OE3MZC]

gday,
a single SCS DSP-TNC with firmware 1.2 and a FT-100 or similar in split mode 
will do it all.
There is no need for a PC. The stand alone DSp-TNC Tracker will do crossband 
and cross mode digipeating. RX on VHF in 1200baud and TX on HF with 300baud 
or even in much more reliable Robust Packet mode.
I used this mode to relay my signals from hand held APRS-trx while hiking in 
desserts of Namibia and using the gear in my parking 4x4  to relay my 
positions into the interrnet via the HF-gates on 10.147,6USB listening in ZS 
and rest of world. Works very reliable!
Only disadvantage would be, that you cannot rx while tx, so you might miss 
some positions from time to time on VHF depending on traffic. It is 
important to keep the packet very short (compressed).

Please let me know if you need further advice on how to setup.
vy 73 de Mike
oe3mzc

----- Original Message ----- 
From: "Geoff" <geoff at gatwards.org>
To: "'Australian APRS Users'" <ozaprs at aprs.net.au>
Cc: <gunter at netlan.com.au>
Sent: Saturday, December 06, 2008 1:25 AM
Subject: [OZAPRS] VHF to HF Gateway for portable use ?


> Folks,
>
>
>
> A few of the blokes from the Blue Mountains ARC are planning a trip next
> year out to Cameron Corner (Corner of NSW, QLD and SA).
>
>
>
> There are a couple of motorbikes in the convoy, and what they were looking
> at doing was to run APRS on the bikes (VHF) and relay their position via a
> mobile VHF to HF gateway in one of the support 4x4 vehicles.
>
>
>
> Does anyone know of an easy way to achieve a compact gateway?   The only
> thing I can think of at the moment is to back-to-back two TNC's, or have a
> laptop in the vehicle running an APRS client app that supports gatewaying.
> Of course the bike posits would be sent at HF rates whilst this gateway
> operation was being conducted..
>
>
>
> Interested in any ideas I can pass back to the guys..
>
>
>
> Cheers,
>
> Geoff   VK2XJG
>
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> Ozaprs at aprs.net.au
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