[OZAPRS] VK3 Freq change looks good!

[Dion Bramich]

My beacon rate is not set to 10 seconds.

On Tue, 17 Oct 2006 21:12:23 +1100, Richard Hoskin <vk3jfk at amsat.org>  
wrote:

>
> Gday Scott,
>
>>
>> Noticed last night that VK3RGI-1 & VK3REB-1 & VK3VHF-1 have made it all
>> the
>> way to Kingston Tassie (south of Hobart!)
>>
>>
>>
>> This is promising as the summer troppo improves we should see this
>> regularly
>> one should think?
>
> APRS is a nice tool to use for indicating good propagation conditions
> however this is not such a good thing for the APRS network as a hole as

> it
> can increases the Data levels on the RF network to the point were it may
> easily become congested.
>
> APRS is designed to be on a local RF network. It's based on the cellular
> phone system where the coverage area of an individual cell is small so  
> that
> the same frequency can be reused in other cells. The cell does not
> re-radiate the signal, it takes the signal from the air and passes it to
> it's destination via a wired line system. In the case of ARPS this is
the
> IGate.
>
> We compromise a little in APRS as the IGates are not at every digipeater
> (cell) but normally within a range of 1 or 2 digis (in VK3). This means

> that
> a mobile APRS station will only cross a maximum of 2 digi cells to get
to
> it's local IGate.
>
> Below is an example of a congestion issue. This station has his beacon  
> rate
> set to 10 seconds. This may not have a big impact on his local RF system

> but
> it creates big problems for the system 2 or 3 digipeater hops away. In  
> this
> case VK3.
>
> (Note that this data is from findu and does not contain all the possible
> digipeated combinations that occurred. It only contains the first  
> instance
> to reach the findu database.)
>
> 20061017063134,VK7YBI-9>4QP7V3,WIDE1-1,WIDE2-2,qAo,VK7DC:`IS+o*#j/"6?}
> 20061017063144,VK7YBI-9>4QP7U6,WIDE1-1*,WIDE2-2,qAo,VK7DC:`IS0o @j/"6C}
> 20061017063154,VK7YBI-9>4QP7T9,WIDE1-1*,WIDE2-2,qAo,VK7DC:`IS6np$j/"6C}
>
20061017063219,VK7YBI-9>4QP7R6,VK7RAA,WIDE1*,WIDE2-2,qAo,VK7DC:`IS8o-Tj/"6
9}
> 20061017063242,VK7YBI-9>4QP7Q1,WIDE1-1*,WIDE2-2,qAo,VK7DC:`IS6o $j/"67}
>
20061017063252,VK7YBI-9>4QP7P0,VK7RAA,WIDE1*,WIDE2-2,qAo,VK3VHF-1:`IS9o>4j
/"
> 60}
>
> This type of issue can flow in both directions too.
>
> Today we effectively have one big network not two smaller isolated  
> networks.
> What ever happens to one will have an influence and affect the other,  
> that's
> why we all need to work together.
>
> Cheers
> Richard
> VK3JFK
>
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>
>



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