[aprssig] Local Event using RELAY?
HamLists at ametx.com
Sat Apr 2 08:45:34 CST 2005
> -----Original Message-----
> From: Henk de Groot
> Posted At: Saturday, April 02, 2005 8:29 AM
> Subject: Re: [aprssig] Local Event using RELAY?
> Sorry but we are talking about the channel access
> characteristics only, not the full ALOHA network. ALOHA in
But the numbers you espoused from the ALOHA project are not about
channel access only but about their findings with retries.
> Now for your APRS area being mostly CDMA. I have to agree for
> home-stations, digipeaters and others with good antenna's and
> terrain that allows you to hear eachother. But if I take my
> TH-D7 outside with its rubber-duck, the TH-D7 can only hear
> the digi - at least frequently...
But you obviously missed that most of the packets that the TH-D7 is
competing with are from that digipeater and therefore it too is
> While reading your mail I also had another strange feeling.
> If every station can already hear all its neigbours, why do
> you have a digipeater?
I said hear, not decode. Big difference.
> Okay, I'll leave it with that. I think the raised points are
> clear and I even think we don't disagree much. Avoid however
> to take things for granted because you once learned that
> doing something is a bad thing. Keep an open mind and dare to
> question these kind of general assumptions.
I have not. I did question your general assumptions and showed their
fallacies. You might think about following your own advice and not
discard a reasoned objection just because you think its ok to transmit
in-the-blind on the shared APRS channel.
> By the way, did you know DAMA also works without carrier
> detection? In DAMA the master (the node) does the listening
Yes, but it uses a different type of collision avoidance and immediately
begins to fail when non-DAMA activity occurs on the same channel.
> Another example of running without carrier detection is Full
> Duplex connection on a point to point link. Its just assumed
> that you are the only transmitting station on one of the two
> QRG's of the FD link. All our packet interlinks on 23 cm work
> that way.
Again, completely irrelevant to the topic.
Pete Loveall AE5PL
mailto:pete at ae5pl.net
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