[OZAPRS] Kantronics KAM and UI-View 32

[Richard Hoskin]

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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