[OZAPRS] Kantronics KAM and UI-View 32

vk7arn vk7arn at bigpond.com
Thu Apr 5 21:03:18 EST 2007


Thanks for that Richard.  When there's anything happening (rarely) I run
an HF
gate so have an idea on the traffic that's around.  I don't think, given
the
short duration and low traffic, our experiment will cause too much of a
problem.
The whole exercise is an experiment and the level of co-operation around
the
State is terrific. Re the alternate HF freq. - has been considered, but
I'm
hoping someone will hear us somewhere and I-Gate.  The end of the line is
at
Rally Command in Hobart where AGWTracker (better map handling and easier
for the
inexperienced PC operator) will be drawing from the server.  So, all our
traffic
has to get to an I-Gate.  We are a bit light on for HF APRS equipped base
stations - we are all in the field!  (Though maybe Dick will be ready?)
NVIS is
on the agenda for next time though!  

Thanks
Roger vk7arn

PS Our next event is a horse endurance ride - so some scope for more but
different!

-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf
Of Richard Hoskin
Sent: Thursday, 5 April 2007 19:58
To: 'VK / ZL APRS Users'
Subject: Re: [OZAPRS] Kantronics KAM and UI-View 32



Gday Roger,

On HF APRS you are potentially sharing the one low capacity frequency with
the
world. In reality, depending on atmospheric conditions you will be sharing
the
frequency with most of Australia and New Zealand (the amateurs across the
Tasman
:).

The HF capacity has less than 1/3rd the VHF capacity yet has the potential
cover
10 times the population. Shoving a big VHF ball in a small HF hole just
won't
work. We all need to be mindful of this when operating HF APRS in everyday
situations.

(Remembering that an average length APRS Posit packet takes 3 to 4 seconds
to
transmit on HF. And assuming a channel efficiency of 30% for ax25 this
results
in a maximum of 7 stations being able to transmit per minute.)

The Targa Tasmania Rally is a managed special event not an everyday
situation
and you are running 3 cars (assuming a beacon rate of 1 per minute). So
it's not
going to have a big impact on APRS HF for an extended period. You may also
decide to run it on a different frequency or band.

>From a technical view point I'd be interested in how reliable the HF 
>comms
will be.

Cheers
Richard
VK3JFK



> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] 
> On Behalf Of vk7arn
> Sent: Thursday, 5 April 2007 3:29 PM
> To: 'VK / ZL APRS Users'
> Subject: Re: [OZAPRS] Kantronics KAM and UI-View 32
> 
> Richard
> You say never send VHF data to HF.  Yesterday (or maybe the day 
> before) I said I planned to do just that and there was no response.  
> What I'm trying to do is get
> data from VHF equipped vehicles passing through "the wilderness" back to
> an
> I-Gate.  We will have a chain of VHF digis but the country is hilly and
> chances
> are slim. I estimate traffic will be half a dozen beacons times 3, each
> over a
> period of about 10 minutes.  Is there a technical issue I haven't
> considered?
> Would appreciate input.
> Cheers
> Roger vk7arn
> 
> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] 
> On Behalf Of Richard Hoskin
> Sent: Thursday, 5 April 2007 12:53
> To: 'VK / ZL APRS Users'
> Subject: Re: [OZAPRS] Kantronics KAM and UI-View 32
> 
> 
> 
> Gday Dick,
> 
> You need to use AGWPE with UI-View32 to use both ports on the KAM.
> 
> Remember to follow the guide for HF APRS at 
> http://www.aprs.net.au/hf_aprs_information.htm and never send any VHF 
> data to HF.
> 
> Cheers
> Richard
> VK3JFK
> 
> 
> > -----Original Message-----
> > From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au]
> > On Behalf Of VK7DIK
> > Sent: Thursday, 5 April 2007 11:50 AM
> > To: ozaprs at aprs.net.au
> > Subject: [OZAPRS] Kantronics KAM and UI-View 32
> >
> >
> >
> > Hi All,
> >
> >        Anyone out there using a Kantronics KAM with UI-View32 ? If 
> > you do could you send me info on how to set it up ? The KAM uses 1 
> > RS232 port to work 2 RF ports. If I can get the KAM to work I will 
> > put the HF port on 30 meters.
> >
> >
> > Cheers, Dick.
> > VK7DIK
> >
> > Please Note.
> > My e-mail address at home is vk7dik at dodo.com.au and work is 
> > dick.vanbeek at zinifex.com If your address book do not have these then 
> > please change it.
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