[aprssig] Re: Feeding multiple stations into one for digipeating?
steve at dimse.com
Sun Jun 11 19:12:16 CDT 2006
On Jun 11, 2006, at 7:46 PM, Patrick Green wrote:
> I wanted to state that what I'm trying to do is capture small
> trackers better. This is no different than what a multi-receive
> site repeater does. It has a "voter" that takes the best quieting
> signal and transmits it. I want to do the same here, If I have 4
> copies of the same packet each from 4 different participating
> receivers and the packet is eligible for retransmission, only 1
> copy gets sent out over RF. The central digi will still be CSMA
> to the other traffic on channel. I want to use the internet as the
> medium to bring the traffic to the central digi.
Just so you understand the reason passions may be aroused by your
proposal, consider that the APRS Internet System is really the
world's largest diversity receiver system. There are hundreds of
participating receivers, not just four. The APRS-IS removes all the
duplicates from multiple receivers, yet clearly trying to force the
stream back out on RF is not going to work. That is an extreme
example, but when you talk about the system you are describing, the
concern some people have is that it will degrade the local RF
network. In an area with low traffic loading, using outlying
receivers feeding a central transmitter may improve things, but in an
area with moderate to high RF traffic, it will make things worse.
I'm sure this thread will soon delve into arguments about ALOHA,
CSMA, and so on, but keep in mind the first thing a young doctor
learns: "First do no harm"!
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