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[aprssig] Solar Powered Digi

Eric H. Christensen kf4otn at earthlink.net
Thu Dec 23 21:16:48 UTC 2004


Not necessarily.  The station transmitting on 144.99 would have
listened on 144.39 before transmitting.  The digipeater would simply
transmit on 39 which was clear a moment ago and would give the local
mobile station priority over all the DX stations, etc.


73s,
Eric KF4OTN
kf4otn at amsat.org
http://www.ericsatcom.net

-----Original Message-----
From: Ryan Tourge [mailto:k2rrt.lists at gmail.com] 
Sent: Thursday, December 23, 2004 16:07
To: Eric Christensen; TAPR APRS Mailing List
Subject: Re: [aprssig] Solar Powered Digi


If it listens on 144.99 and talks on 144.39, won't it QRM everything
on 39 because it won't know there is traffic there?


On Thu, 23 Dec 2004 12:42:40 -0500 (GMT-05:00), Eric Christensen
<kf4otn at earthlink.net> wrote:
> Mark,
> You are missing the point.  The digipeater that Bob is describing 
> would only listen to 144.990 and thus would not be listening to out
of 
> area traffic.  Thus, only 2-5%.
> 
> Eric KF4OTN
> 
> -----Original Message-----
> From: "Mark A. Lewis" <mark at siliconjunkie.net>
> Sent: Dec 23, 2004 10:59 AM
> To: TAPR APRS Mailing List <aprssig at lists.tapr.org>,
jj at aprsworld.net
> Subject: RE: [aprssig] Solar Powered Digi
> 
> There are some big assumptions in that. Our local digi on 144.39
does 
> not hear much non local traffic. Saying that TX load would only be 
> 2-5% because it is local only is very dependent on geography and if
it 
> can hear other digis from where it is.
> 
> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Robert
Bruninga
> Sent: Wednesday, December 22, 2004 11:16 AM
> To: jj at aprsworld.net; aprssig at lists.tapr.org
> Subject: Re: [aprssig] Solar Powered Digi
> 
> A real power-saver on SOlar Powered Digis:
> 
> If you need a digi in an area, but cannot afford the huge solar
power 
> system to keep it on the air most of the time, consider making it
an 
> ALT-INPUT digi on 144.99 instead of a full service digi on 144.39.
> 
> The TX load will be 2 to 5% of what it would be if the input was on

> 144.39 because it will only digipeat the locals that need it, and
not 
> the 98% of other digipeater traffic coming at it from all
directions.
> 
> Your digi will listen on 144.99 for locals and low power trackers 
> (probably fewer than a dozen) but will still digipeat them over to 
> 144.39 to join the network.
> 
> Just a thought for some special applications...
> bob
> 
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-- 
Ryan Tourge - K2RRT
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