[OZAPRS] HF APRS is different... to VHF APRS

[Bob Bruninga]

This was posted on the OZAPRS list and I thought I'd copy it here
(condensed)...

On Sun, 30 Nov 2003, Brian Beamish wrote:

> HF Packet is different, Really different to VHF APRS. [Its 4 times
> slower! and only 25% of the capacity of your local LAN.]
>
> 1. On HF a beacon at either 15 or 30 minute intervals is all your will
hear
>    of a HF APRS Gateway.
> 2. The HF Gateway does NOT digipeat on HF
> 3. HF gateways gate traffic to VHF and internet but there should NOT be
>    traffic the other way round, ie VHF and internet to HF.
> 4. You can NOT connect to a HF Gateway
> 5. Your beacon should NOT contain Speed and Height etc just the very
basic
>    location no more.
> 6. You do NOT use 1200 baud on HF your use the slower 300 baud.
> 7. Your beacon should be [SHORT], mine at 21 character takes almost 4 s
> 8. [DO] NOT ping, query, send messages or chat etc on HF
> 9. You generally can NOT track other stations, unless heard direct by
you,
> 10. Try to NOT interfere other HF APRS stations with your beacons which
is
>     hard due to HF Skip as you may not hear them..
> 11. You should NOT send Objects or the like on HF
> 12. You MUST [tune accurrately] with a HF Gateway like VK3SB or VK4DMI
>     if you don't you will just NOT get heard.
> 13. Please use the recommend path of only GATE,WIDE when on HF!
> 14. Above all you should think of others particularly on HF...
> 15. You do NOT really need a TNC for HF APRS just a tracking module like
a
>     TigerTrak is all that is required.
>
> Give HF APRS a try really needs a few more there and certainly another
two
> or three suitably place HF Gateways around VK/ZL would be most welcome,
look
> forward to hearing your beacons there.
>
> Hope that the above gives some food for thought to those contemplating
> operating on HF APRS.
>
> B C N U
> Brian VK4BBS
> Brisbane.
>
> Yes this is an plug for I like VK4DMI are very happy with our APRS, SSTV
and
> GPS product and service of Tigertronics it is worth having a look there
> http://www.tigertronics.com/ especially whilst the Aussie Dollar is so
good.

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