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[aprssig] Fill-in Digis

Robert Bruninga bruninga at usna.edu
Fri Mar 24 23:17:39 UTC 2006


Hummh, I assumed additional packets would be
added frames in the same packet.  But that is a good
question for a true DCD instead of noise squelch.,
Bob

>>> scott at opentrac.org 03/24/06 5:32 PM >>>
So should they go by DCD?  I assume you don't want to just start
transmitting at the trailing FLAG character, since there could be another
packet coming.  Is there any consistency in how TNCs handle dwait = 0?

Scott
N1VG 

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Robert Bruninga
> Sent: Friday, March 24, 2006 2:11 PM
> To: aprssig at lists.tapr.org; gregg at wonderly.org 
> Subject: Re: [aprssig] Fill-in Digis
> 
> Yes, 
> In my opinion, all APRS digis no matter what kind
> whould have Dwait set to 0.  Thanks.   Bob
> 
> >>> gregg at wonderly.org 03/24/06 12:00 PM >>>
> Robert Bruninga wrote:
> > 2) But he hears the digi just fine at the same
> > distant location.
> > 
> > The FILL-in digi being closer to him will pick up
> > his signal quite well and give it a better chance
> > of getting into the big digi.    But, being a fill-in
> > digi, it will NOT add to the QRM by making
> > unneeded copies of 100% of all the other 
> > traffic on the channel.
> 
> Isn't this only true if the Fill-in is configured with 
> dwait=0 so that the 
> digipeat happens immediately.  Otherwise a group of fill-ins 
> in a hilly area may 
> create multiple copies while they all politely wait for a 
> quite channel, right?
> 
> Gregg Wonderly
> W5GGW
> 
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