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[aprssig] WIDE1-1,WIDE2-2 vs WIDE3-3

Andre PE1RDW aprs at pe1rdw.demon.nl
Tue Jan 10 17:57:52 UTC 2006


Ron Stordahl schreef:

> For the sake of this example, this discussion is for a N=3 area, i.e. 
> where a maximum of 3 digipeats are permitted.  Also my experience is 
> with UIDIGI-ROM's primarily, so I will confine my discussion to them.
>
> In such an area I  believe the recommended maximum via would be:
>
> via WIDE1-1,WIDE2-2 rather than via WIDE3-3
>
> This would be the case since WIDE1-1 is included to as to take 
> advantage of any 'fill-in' digis which limit their response to just 
> WIDE1-1.  Additionally if this transmission is heard by a UIDIGI-ROM, 
> it will repeat it and send it on with the remaining unused via of 
> WIDE2-2.  Subsequent UIDIGI-ROM's will repeat this, the first leaving 
> a remaining via of WIDE2-1, the second repeating it without any 
> additional repeats possible.  Thus the limit of 3 is enforced.
>
> Instead if the initial route was WIDE3-3, no properly configured 
> 'fill-in' digi will repeat the packet, however the UIDIGI-ROM's will 
> act properly enforcing the N=3 limit.
>
> However if the user sends:
>
> via WIDE1-1,WIDE3-3, he will obtain 4 digipeats in either the case of 
> it's being initially repeated by a fill-in digi or by UIDIGI-ROM, thus 
> the limit of 3 has been broken.
>
> If I were concerned enough about this in my N=3 area, I would 
> configure my UIDIGI-ROM as N=2 limited digi's, and then 
> WIDE1-1,WIDE2-2 would obtain 3 repeats and WIDE1-1,WIDE3-3 would be 
> limited to just 2, as WIDE3-3 would be in the UID list as a literal.
>
> It is possible I suppose that some smarter digipeaters would restrict 
> WIDE1-1,WIDE3-3 to a total of 3.  Are there such 'smarter' digipeaters?
>
> Ron Stordahl, N5IN

Digi_ned can be configured to rewrite wide3-3 to wide2-1 after 
digipeating, you can also set it so that if wide3-3 is the first alias 
in the digilist that it will rewrite to wide3-2 after digipeating, all 
after insterting it´s own call offcourse.
I think this is what you are looking for.
Digi_ned can be run on a linksys nslu2 giving you a software digipeater 
with just 3 watts additional power usage that can be upgraded to a 
powerlan (70cm 9k6) multiport system if the need arises.

73 de Andre PE1RDW




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