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[aprssig] HF APRS new ideas

Robert Bruninga bruninga at usna.edu
Tue Jun 1 14:13:51 UTC 2010


I wonder if someone could mine the APRS-IS and see how many
packets that are transmitted with the path of GATE as the first
hop are actually picked up by the APRS-IS befor gating.

Actually, this might be useless, because once such a packet is
gated, I think it does callsign substitution and so the fact
that it started with GATE is lost?  I cant remember if the KAM
does that or not... 

Anyway, if someone can think of a way to do statistics on HF
packets and see how many are heard direction by the IS and how
many are gated to VHF and then go one hop to the IS wouild be
useful info.

Bob, Wb4APR

> -----Original Message-----
> From: aprssig-bounces at tapr.org 
> [mailto:aprssig-bounces at tapr.org] On Behalf Of Sergej
> Sent: Tuesday, June 01, 2010 5:47 AM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] HF APRS new ideas
> 
> 
> > Here in Australia we have a number of HF Gates that Gate to 
> VHF and that are
> > NOT connected directly to an IGate. This will not change in 
> the future.
> 
> > I would think that there are still a number of countries 
> where broadband
> > internet is not readily available and it may take an HF to 
> VHF Gate to get
> > the APRS data to the APRS-IS.
> 
> Richard, your are right. There is still many places in the
world where
> internet connection not possible in rural areas, but possible
of good
> HF receptions facility (low industrial noise level). With a
VHF link
> to near possible Igate its still a good job.
> 
> 
> Bob, about "obsolete" HF path of GATE,WIDE2-1 - as I'm
understand its
> need to trigger HF-to-VHF gate facility of KAMplus and KAM-XL
TNC's.
> 
> UI-VIEW based system can be set to pass all received data on
HF port
> to VHF port even w/o that trigger of "GATE". Also think 
> DIGI-NED can be
> configured this way too. In general its not bad, as HF channel
never
> have bigger throughput then VHF.
> 
> About HF digipeating, its not recomended in general, but we
has try
> it in Europe, for example to pass aprs message from Ukraine 
> to England,
> propagation not always allow to do it, and with help of Digi 
> in Italy its
> possible. Can we review to use one hop digipeating on HF for 
> that cases?
> 
> 
> 73, Sergej
> uz2hz/ut1hzm
> 
> 
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