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[aprssig] A TNC2 (clone) question

Steve Daniels steve at daniels270.eclipse.co.uk
Mon Nov 14 17:52:05 UTC 2011

Argent data will program a KISS rom for $5, they will also program a UIDIGI
rom for free to encourage digipeaters. Using a 27C256 rom.

At a  guess they would probably program other digipeater firmware for free.

You need to supply the code you want programmed however.


I have both roms for a tnc2 clone from them


Steve Daniels


Torbay Freecycle Moderator


From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
Of Stephen H. Smith
Sent: 14 November 2011 17:18
To: TAPR APRS Mailing List
Subject: Re: [aprssig] A TNC2 (clone) question


On 11/14/2011 9:24 AM, kc8sfq at mei.net wrote: 

Hi  All:
I have an old MFJ1274 TNC. I'm thinking of putting it, along with a radio
and a gel cell battery, in a waterproof box for use as a temp DIGI for SAR
and similar such field use.

What I know about the MFJ:
1: It won't work with APRSISCE/32 (my fav) since it won't stay in KISS mode.
2: It'll require a new EPROM for extended KISS operation. That's about
$40-50 by the time it's all up and running. There are better and easier ways
to do that for the same money.

Replace the eprom with the last-ever TAPR Release 1.1.9 firmware which has a
perfectly serviceable KISS implementation in it.   

My questions:
1: Will the MFJ1274 support the new n-N paradigm? or will it need to be
addressed by it's specific callsign-SSID? (I know it's been upgraded to at
least 1.2.9 firmware)

Not as-is, with the exception that if all you want it to do is be a
home-style first-hop fill-in digi, then set it's callsign "alias" to
"WIDE1-1" . (The first-hop WIDE1-1 digipeating doesn't depend on the TNC
having  the APRS-centric callsign-changing/substituting capability described

2: will the MFJ even function as an APRS DIGI? (my understanding is that
there's nothing special about an APRS packet as far as a DIGI is concerned)

But there ARE major differences between classic connected packets and APRS
packets !   

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