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[aprssig] [amsat-bb] TH-D72A for satellites (and everything else)

Andrew Rich vk4tec at tech-software.net
Tue Dec 7 22:03:31 UTC 2010


I have been using a home brew 19k2 tracker . 

But most hams don't build anymore

They are slaves to the manufacturers

Ads-b sounds like a click at 1 mb/s

As long as you accept 1200 baud as the norm don't complain or get building people



Sent from my iPhone
Andrew Rich

On 08/12/2010, at 7:56, Andre v Schaijk <aprs at pe1rdw.demon.nl> wrote:

> 
>> So true. Even the POSITION folks don't get it.  APRS was NEVER
>> for maintaing accurate TRACKS on people.  There is NO WAY for
>> 400 local commuters to share a single 1200 baud channel, NOT
>> EVEN 10.  The point of APRS POSITIONS is simply for showing
>> WHERE someone is in the APRS network for the purpose of
>> COMMUNICATIONS. It is NOT for TRACKING!!!!
>> 
>> But all those trackers, and egos and high rates and
>> peg-every-turn applications kill the channel for everyone else.
>> Sure, high rate tracking has a value at special events.  BUT NOT
>> FOR ROUTINE COMMUTING!
>> 
>> Spread the word!
>> 
>> Bob, WB4APR
>> 
> If people want to use APRS for high rate tracking and 1 1k2 channel can not handle it then just use more then 1 channel bundeling them to 9k6, I suspect for this application one 9k6 channel can handle 16 1k2 inputs especialy as in this case only the digipeater needs to transmit on the 9k6 channel, the homefront can just listen to the 9k6 channel, they won't need to transmit because most of those highrate trackers are tx only anyway.
> 
> you could share the 9k6 channel with other digipeaters but they most likely would not need to pass eachothers trafic, the only reasons for having more then one digi for this application is to expand the rx range, the home stations should be able to recieve these digipeaters much further then a mobile tracker, heck taking collisions in account on the current 1k2 channel it would be much more effecient too then recieving the trackers trough one or more hops on .39.
> 
> 73 de Andre PE1RDW
> 
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