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[aprssig] APRS W,W and W,W,W example

Spider spider at rivcom.net
Fri Feb 11 18:14:08 UTC 2005

I start out as WIDE2-1 out here and that gives me the amount of hops I want.


----- Original Message ----- 
From: "Bill Vodall" <wa7nwp at jnos.org>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Friday, February 11, 2005 11:07 AM
Subject: Re: [aprssig] APRS W,W and W,W,W example

>> I understand about the RELAY, but WIDE,WIDE and WIDE2-2 seem to me to 
>> have the
>> same number of repeats for a given configuration of digis. A packet only 
>> gets
>> transmitted twice, since a digi won't hear as it transmits, it seems to 
>> me that
>> the same digis transmit regardless of WIDE vs WIDEn-n.
>> Can you explain why there would be "3 to 5 times" as many dupes?
> I'll take a go at it.
> Kantronics TNC's do dupe checking on WIDE2-2 but not generally on the
> WIDE,WIDE.   Thus with a WIDE,WIDE path you can get ping-ponging between
> digi's you won't get with a WIDE2-2.   The "3 to 5" number is probably a
> worst case which is seldom seen.  Normally it might be a couple extra 
> packets.
> It all depends on how many WIDE digis are in a area that hear each other.
> It's not a problem with Digi_ned or, I believe, UI-digi.
> Bill
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