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[aprssig] Local Event using RELAY?

Robert Bruninga bruninga at usna.edu
Mon Mar 28 20:38:32 UTC 2005


>>> HamLists at ametx.com 3/28/05 12:44:46 PM >>>
>The question of operating on two different frequencies 
>at the same time as you describe it begs the question 
>"Why?", if what you say about carrier sense by the 
>digipeater is true (that it won't hear anything other than 
>the distant digipeater anyway).  If that is the case, why not
>have everyone operate responsibly on 144.39 if that is 
>where you want them?  

Because, the local mobile digi at the event is hearing
the distant digi all the time and so its receiver is hearing
a very busy channel.  Thus its chance of hearing the
local 1/4W tracker is minimal.

But if it is listening on 144.99 and only the 1/4 watt tracker
is transmitting on 144.99, then the success rate is greatly
higher...

>There is a way to operate on two frequencies AND 
>operate responsibly.  That is to have an IGate on the 
>alternate frequency and have an IGate on 144.39 gate 
>anything the other IGate hears to 144.39.  

Yes, that would work, but very cumbersome and I doubt 
the original plan included bringing the internet to the field.

Bob

> -----Original Message-----
> From: Robert Bruninga
> Posted At: Monday, March 28, 2005 11:17 AM
> Subject: Re: [aprssig] Local Event using RELAY?
> 
> >>> mwrobertson at comcast.net 3/28/05 11:47:58 AM >>>
> >That then makes the [mobile event digi] transmit on 144.390 without

> >listening first and thus qrm'ing anything else on 144.390. 
> That is not 
> >the right way to operate period.
> 
> Too many angeles on that pin, I am sorry to say...
> You are not looking at the big picture and not seeing the 
> forest for the trees.  Its just common sense.

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