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[aprssig] Need Path Mentoring

Steve Noskowicz noskosteve at yahoo.com
Fri Sep 21 02:43:36 UTC 2007



  Thanks, JT.

  It looks like some of this is finally starting to
stick.  

  The bit about the Asterisk looks confusing, so I'll
have to digest your words carefully.   However, it
looks like my description (_insert_ call and decrement
the appropriate "-1" then add the "*' when
appropriate) was echoed in your words.  
   So what's commonly referred to as "call sign
substitution" may be better described as: "call sign
insertion, with normal WIDEn-x decrementing [which
includes the -0 > "*" step].

73, Steve, K9DCI



--- J T <w0jrt at yahoo.com> wrote:

> Steve Noskowicz <noskosteve at yahoo.com> wrote:
>
K9DCI-9>TRRW0S,WIDE1-1,WIDE2-1,qAR,N9OIG:'t(Fl!h>/]"6]}
> 
> Meaning that:  IGate N9IOG heard me directly and
> shot
> me into the APRS-IS, right?  _____
> Correct.
> 2- Seeing WIDE3-3 in the first slot suggests a Digi
> is
> substituting “WIDE3-3” for my “WIDE1-1” since there
> are digi calls after it?  Eh?
> That's sure what it looks like.  It appears that
> there is a mis-configured digi or fill-in digi that
> is doing call-sign substitution but sticking WIDE3-3
> in there instead of its own callsign.  There is
> evidence to support this in the packets shown below,
> where other digis have seen that the packet was
> retransmitted by station "WIDE3-3" (with that digi
> marked as being used in the AX.25 packet) and
> proceeded to digi you packet using the remainder of
> the path.  This mystery station can apparently be
> heard directly by K9ESV-3, K9ABC-10, EX9MKX,
> WA9CJN-15, and K8BRC.  
> Excerpts from Raw data:
>
K9DCI-9>TRRW0S,WIDE3-3*,K8BRC*,WIDE2*,qAo,N8FQ:'t(El-Q>/]
K9DCI-9>TRRW0T,WIDE3-3*,K8BRC*,WIDE2*,qAo,N8FQ:'t(EliW>/]"6[}
K9DCI-9>TRRW0S,WIDE3-3,K9ESV-3,WIDE2*,qAo,W9TMW:'t(El-Q>/]

> Note that in these examples, there are actual call
> signs with the “*” appended.  Is that part of “The
> New”??  or a mix of new and old.   I thought the
> “old”
> was to accept it and append the “*”,   but new is
> only
> to substitute – but remember that half-life effect.
> Neither, really.  In the new-N paradigm WIDEn-N is
> fully traceable, so each digi that passes on the
> packet will perform callsign substitution.  The
> asterisk isn't related to the old vs. new paradigm
> but is a function of the receiving TNC.  An asterisk
> appears next to the digi that the receiving station
> heard the packet from (or the entire string of
> digis, up to the last one heard, depending on how
> the TNC presents this data to the user).  But to
> know what the original path was, when the "N" in
> WIDEn-N gets decremented to zero the digi that does
> that not only inserts its callsign in the string
> along with setting the bit that indicates that digi
> slot was used, but it keeps the WIDEn-0 in the list
> (where 0 is typically not displayed) and also sets
> the bit to indicate that slot was used.
> Seeing this:
> 
> K9DCI-9>TRRV2Q,K9ESV-3,WIDE1*,WIDE2-1,qAR,N9OIG:'t+O
> Hu>/]"6X}
> Does this say that K9ESV-3 is accepting the WIDE1-1?
>  
> Also, rather than substituting, is it *inserting*
> its
> call and putting the “*” after the “WIDE1” part of
> the
> “WIDE1-1”  ???
> Yes, K9ESV-3 is digi'ing on WIDE1-1, performing
> callsign substitution, but to keep the history of
> the original path, it keeps the WIDE1-0 in the list
> and also flags it as being used such that the rest
> of the path will be used appropriately by other
> digis, since digis have to be used in order from
> left to right.
> The fella doing K9ESV, while a nice guy trying to do
> it correctly, has expressed doubt and asked me (yea,
> right) to look at his parameters.
> It looks like it's configured pretty well.  It
> appears to be a combination WX station and full
> digi.  It appears to be using a single 2-hop path
> (WIDE2-2) instead of a varying path (from 0 to 2
> hops) as is often used in stand-alone digis, but
> since this is sending WX data with each transmission
> path may be appropriate for that area.
> 
> -Jerome, W0JRT
> 


       
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