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M0PZT > UIVIEW 25.09.04 17:46l 58 Lines 1914 Bytes #999 (0) @ WW
BID : F40053M0PZT
Read: GUEST
Subj: Re: Call Suffix
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<ON0AR<7M3TJZ<ZL2TZE<GB7YFS<GB7LGS<
GB7ESX
Sent: 040925/1346z 82465@GB7ESX.#31.GBR.EU $:F40053M0PZT [Witham, Esx]NNA V3.1
M5WJF wrote:-
> My QTH station (if I were generating RF), would not use a Callsign SSID,
> but would use functions within the unproto address thus;
>
> APRS,RELAY,WIDE,TRACE5-5
This was covered as part of a talk I gave at my local club. Harry M1BYT
has a copy of my presentation which I believe was used as part of the
training course that he is involved with.
Anyway, the TRACE vs WIDE is a can of worms. It's only a good as those who
support it. The WIDEn-n digipath is almost useless as it provides no way
of tracing back the path that beacons have taken to get to their
destination.
This is where TRACE comes in. When a TRACE digipeater receives a beacon
with an unproto address that includes TRACEn-n (eg: TRACE7-7), it removes
a number and adds it's DIGI ALIAS to the beacon:
M0PZT > APRS,RELAY,TRACE7-7
M5WJF hears me and digi's me thus:
M0PZT > APRS,RELAY,M5WJF,TRACE7-6
And so the TRACE counts down until it expires.
> When I establish a Mobile Station, am likely to use the following unproto >
address thus;
>
> APRS,RELAY,WIDE and possibly TRACE5-5 since I will be using a computer in
> the car rather than Tiny-Trak (or similar).
Not good. If you wish to spread amongst the network, you'll need to be a
bit more generous with your Unproto Address:
M0PZT-9 > APRS,RELAY,TRACE3-3 for example.
Your example above would only ensure (if within range) of 2 digis.
The only way to get yourself seen is to use a digipath that is supported
by your local digipeaters. Using TRACEn-n is also good as it enables you
to watch how the band is working - if a station you usually see takes 6
hops to get to you, but today is only taking 2, either there is a
high-power digipeater lurking or the 2m band is open...
If all that has got you a bit dizzy, have a browse to my webpage where you
can see a bit more about this:-
http://www.charliedavy.co.uk/amateur/aprs.htm
--
Charlie - M0PZT @ GB7ESX
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