[OZAPRS] Higher beacon rate HF versus VHF?

Richard Hoskin vk3jfk at amsat.org
Mon Mar 30 21:00:06 EST 2009


Hi Dave,

I'm not really asking for agreement.

I was pointing out the recommended mobile HF beacon rate world standard that
has been in place for over 15 years, and the reasons why.

We have a very good VHF APRS Network in Australia that is based on standards
and cooperation.

Cheers
Richard
VK3JFK

> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
> Behalf Of David and Justine Olsen
> Sent: Monday, 30 March 2009 8:12 PM
> To: Australian APRS Users
> Subject: Re: [OZAPRS] Higher beacon rate HF versus VHF?
> 
> Richard,
> 
> I am not sure I agree <snip snip>
> 
> > this results in a maximum of 7 stations being able to transmit per
> > minute.
> 
> 
> You sure? They can transmit all they like. Given the poor Rx success
> rate, they aren't going to cause a whole lot of problems if they
> aren't heard by anyone.
> 
> > Lets see, HF APRS increases the coverage area from roughly 200,000
> > Sq Km
> > using 3 hops to potentially 75 Million SQ KM.
> 
> 
> 
> Australia is different to elsewhere most that space has nobody in it.
> 
> 
> > the maximum number of
> > stations that can be in a single APRS Gate's coverage area is 70
> > stations.
> 
> I wonder how many times you have seen 70 HF stations on APRS at once,
> let alone in one iGate's coverage area.
> 
> 
> David
> VK4MDX
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> Ozaprs at aprs.net.au
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