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[aprssig] Digpeater setup

Robbie - WA9INF mwrobertson at comcast.net
Thu Mar 31 17:49:36 UTC 2005


Correction Below!

Robbie - WA9INF wrote:
> Bob,
> 
> Robert Bruninga wrote:
> 
>>>>> dsparks at pobox.com 3/30/05 11:35:17 PM >>>
>>>
>>>
>>> ... We now recommend that use of WIDE and RELAY are obsolete ... 
>>> because [they do]  more damage than good.  
>>
>>
>>
>>> ... but  isn't there a role to be played by a modified RELAY digi?  
>>> What about a  setup where such a station keeps track of recent 
>>> [packets] received directly,  and then digis them only *IF* they 
>>> aren't heard being resent by a WIDE digi within a certain period of 
>>> time, like 20 sec., let's say?
>>
>>
>>
>> Absolutely, that is a greaat solution.  But it should not be
>> based on the dupe-generating-RELAY legacy.  SImply let
>> that same algorithm work on WIDEn-N packets at that
>> "fill-in-digi" location.  We must wean ourselves from starting
>> paths with RELAY which has no really good dupe-elimination
>> process in most of the digis out there.
> 
> 
> Please explain how RELAY causes DUPES? If I am understanding it, a dupe 
> is when a station retransmits a packet that was digipeated by a previous 
> RELAY. Not when two stations digipeats a packet it heard from the 
> tracker direct.. That is not DUPLICATION.. WIDEn-N digipeaters also 
> attempt to digipeat what it hears direct. If that tracker is using only 
> WIDE2-2 in its path, and both WIDEn-N hears it, then digipeats it, isn't 
> that DUPEs also according to the way you make is seem?
> 
> So, if home RELAY fill ins are spaced properly, what is the problem? 
> They are doing what they were put there to do assuming that the tracker 
> couldn't reach a WIDEn. No other home station RELAY that doesn't hear 
> that tracker direct, will digipeat the tracker because the RELAY in the 
> original path has been stripped and replaced with the original RELAY.
> 

Above line should read:
original path has been stripped and replaced with the original RELAY's 
callsign. Sorry for double posting!

Robbie






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