[aprssig] AEA TNCs and NEWn-N
Stephen H. Smith
wa8lmf2 at aol.com
Sat Oct 22 18:35:11 CDT 2005
lists.nospam at bpsmicro.com wrote:
>Are any of the AEA TNCs (specifically the PK232MBX but the question applies
>to all) capable of being run as NEWn-N digis? It seems they're not UIDIGI
>compatible, and I can't find any information to tell me whether they can be
>"persuaded" to work properly as WIDEn-N digis.
>If the answer is No, then I can tell the owner to hunt around for something
>else (preferably a TNC-2).
No AEA TNC has APRS-aware firmware. They completely lack support for
modern APRS digipeating; particularly N-n decrementing, callsign
substitution, and duplicate packet suppression. Furthermore, the
PK-232, while having an excellent modem, is a real power hog that runs
hot and consumes over 1AMP continuously. This can be a real issue if
you are trying to run digi sites in remote locations on non-grid power,
or on battery backup during emergencies.
All you can do wtth AEA TNCs is either configure them as a dumb home
fill-in digi; i.e. simple RELAY (old paradigm) or WIDE1-1 (new
paradigm) by setting MYALIAS to one or the other of these two paths
Place them in KISS mode and allow an external computer program (DigiNED,
UIview, etc.) to provide the WIDEn-N "smarts".
An interesting alternative to an old TNC2 with UIdigi firmware, at less
than half the cost of a new KCP3+, is the low-cost TNC-X kit with the
new piggyback X-Digi add-on module. X-Digi is designed from the
ground up to support the new paradigm N-n digipeating conventions.
Total cost is about $70 for the two kits. The total current consumption
at 12VDC is less than 30mA compared to the 350mA or so a TNC2 consumes
(or the 1000mA a PK232 consumes). Details at
Stephen H. Smith wa8lmf (at) aol.com
EchoLink Node: 14400 [Think bottom of the 2M band]
Home Page: http://wa8lmf.com
"APRS 101" Explanation of APRS Path Selection & Digipeating
Updated APRS Symbol Chart
New/Updated "Rev G" APRS http://webs.lanset.com/wa8lmf/aprs
Symbols Set for UI-View,
UIpoint and APRSplus:
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