[aprssig] "station which heard ... directly on the radio"

John Wiseman john.wiseman at cantab.net
Tue May 21 03:27:15 CDT 2013


Kristoff,

My understanding of TNC-2 monitor format is that the * is appended to the
last used call (ie the station the packet was actually heard from). This
seems to agree with what APRS101 says

"In both formats, the callsign of the digipeater from which the incoming
packet was heard is indicated with an asterisk. (Alternatively, for "AEA"
format only, the asterisk will follow the source callsign if the packet was
heard direct from there"

So your example should be

U0QRQ5-0 via ON0WTO-2,WIDE1-0,ON0OST-0*

73, John G8BPQ


-----Original Message-----
From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
Of Kristoff Bonne
Sent: 20 May 2013 23:16
To: aprssig at tapr.org
Subject: Re: [aprssig] "station which heard ... directly on the radio"

Hi Lynn,


Thanks for your reply.

(see inline comments).

On 20-05-13 20:45, Lynn W. Deffenbaugh (Mr) wrote:
> On 5/19/2013 2:27 PM, Kristoff Bonne wrote:
>> I did find this pretty odd so I looked in the "raw messages" for this
>> station:
>> 2013-05-19 12:08:32 CEST:
>> ON4NS-9>UQPTY6,ON7EQ,ON0OST,qAR,ON1ARF-2:`y_.oR9>/`"4F}_"
>>
>> This does not look to be a "heard directly". It has been digipeated 
>> twice before reaching my node.
>
> That packet has no used (*) path components, so it would appear to 
> have been heard direct by ON1ARF-2.  Based solely on that packet, the 
> ON4NS-9 station appears to have requested explicit support of the 
> ON7EQ and ON0OST digipeaters in that order, neither of which indicate 
> having been used, so ON1ARF-2 must have copied the original packet 
> directly from ON4NS-9.

Well, althou these application where not written by me, I did take the time
to have a look at the source-code  of multimonNG. It seams there is no code
to add a '*' of the C-bit is set in the SSID part of an address.

However, it's not realy clear how exactly this should be corrected.

I noticed that when you just set the asterisk everywhere where that bit is
set, you get paths like this:
... to U0QRQ5-0 via ON0WTO-2*,WIDE1-0*,ON0OST-0* (just copied this off the
air 5 minutes ago).

Is this correct? When I look in the archive of "raw" messages on aprs.fi, I
do not see such an paths overthere! The asterisk in only on the last message
or the one before that?



On what addresses in the path does there need to be a asterisk?
All addresses with the C-bit set? Only the last? Only the last, or the one
before that if the last address in the path is a "WIDE"?
But what if that WIDE-address at the end of the path does not have a '*' 
itself?


73
kristoff - ON1ARF

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