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[aprssig] Alinco DR-135T - EJ41U internal modem

hasan schiers schiers at netins.net
Tue Nov 1 17:21:37 UTC 2005

The DR-135T is useless for APRS in KISS mode. There is NOTHING one can do to 
make it work properly in KISS. I have one. It is running with an external 
TNC just fine. (Tiny2). People have been begging for a way to make the KISS 
mode work properly for at least a year, perhaps two....none of the proposed 
fixes/work-arounds actually work. The buffer just can't hack it.

...hasan, N0AN
----- Original Message ----- 
From: "Ron Stordahl" <ron.stordahl at digikey.com>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Monday, October 31, 2005 9:30 AM
Subject: [aprssig] Alinco DR-135T - EJ41U internal modem

> The Alinco DR-135T internal TNC is their EJ41U board.  Here is a quote 
> from their FAQ at www.alinco.com regarding this board:
> Q: Does EJ41U TNC unit support the KISS mode ?
> A: Yes it does but unfortunately in a limited way. As the default setting 
> you must configure the EJ41U to the KISS every time you turn on the radio. 
> In order to ease the KISS operation with the EJ41U you may refer this 
> website at http://research.aerocity.net/tnc/ej-41u/  Please be advised 
> that this site is totally created and maintenanced by the 3rd party and 
> Alinco declines any and all responsibilities for its contents, the 
> consequence of utilizing the information written therein and any form of 
> the tech-support relative to this subject.
> I tried to go to the web site for additional information on that internal 
> tnc, but the link was dead!
> So it doesn't look good.  I do have a DR-135T which I use in my car with a 
> TinyTrack and am pleased with it.  I also did hook up as a test an 
> MFJ1270C to the DB9 connector on the rear of the DR-135T and it worked 
> fine.  Looks like one should be skeptical of the EJ41U modem option in the 
> DR-135T.
> Ron, N5IN
> scott at opentrac.org wrote:
>>> Assuming this refers to the Alinco DR-135 with built-in TNC, I'd be 
>>> curious about the details of
>>> this opinion.   I was under the impression that
>>> these (or just about any TNC) works just fine with APRS and any IGate.
>> Haven't tried it myself, but I keep hearing things about buffer issues 
>> and
>> (I think) lockups.  But then, I tend to forget that a lot of people don't
>> run KISS mode.  Maybe in converse mode it's OK.
>> Scott
>> N1VG
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