[aprssig] 9600 baud SuperSite for LA

[Robert Bruninga]

Sorry, spider.  You're comparing apples and oranges...

>>> spider at rivcom.net 1/6/05 6:56:06 PM >>>
>I ran 9600 baud nodes for a few years.....
>Guess what?  9600 baud is not going to fix So Cal.  
>It's not as fast as you  think in a Packet mode.

Yes, that is common knowledge for CONNECTED MODE.
With ACKS, and TXD's for every packet. the actual 
throughput is only about twice what it is for 1200 baud.

BUT***** THIS IS A BIG DIFFERENCE.

The BACKBONE or SUPER-LAN concept is nothing like
that.  It is a full 100% continuous stream of 9600 baud
data  without ACKS and with only an occassional TXD
delay when there is not enough data to keep the 
transmitter up.

So forget what you knew before.  This is totally different.

>So Cal area needs to be focusing on real microwave backbones 
>running 56k or T1 or better in a full duplex link arrangement.  

Way off by orders of magnitude.  A single 9600 baud channel
can easily handle over 500 APRS stations at normal rates.
That is more than enough to handle all of SOCAL.

Bob, Wb4APR


To: <aprssig at lists.tapr.org>
Sent: Thursday, January 06, 2005 4:30 PM
Subject: Re: [aprssig] 9600 baud SuperSite for LA


> More inputs on the 9600 baud Super site:
>
> 1) One of the local TNC's can be on the tracker input of 144.99
> 2) Another one can be on a link from San DIego
> 3) Another one can be on a SPECIAL VHF freq for use
>    by special people or events
> Since the ROUTER does dupe elimination and seamlessly
> inserts ALL packets into the 9600 baud stream, you can
> easily use these multiple receivers to spread out the local
> QRM load tremendousely.
>
> Just remember that anthing that comes into the router from
> other than a local 144.39 ALOHA area wont be heard by
> anyone else except the Super Users and the internet.
>
> For this reason, you could make an exception for the low
> power 144.99 tracker channel and let it digipeat back to
> 144.39.  I'd do it at low power so that it can be heard
> donw in the ALOHA areas if the channel is clear, but if
> not, it is so weak as not to QRM any of the lower digis.
>
>>>> bruninga at usna.edu 1/6/05 3:08:53 PM >>>
> I can't resist.  I consolidated all the topics relating to
> a SUPER-SITE at 9600a baud and made a WEB page:
>
> http://www.ew.usna.edu/~bruninga/aprs/superlan.html 
>
> It condenses all the 9600 baud UHF stuff that has been
> on the bottom of my "fix14439" web page into a good
> concrete example...   de Wb4APR, Bob
>
>
>
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> aprssig at lists.tapr.org 
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> 




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