[aprssig] DR-135TP - EJ-41U TNC / T2-135

40.174N 75.797W 40.174n75.797w at gmail.com
Fri Sep 21 10:39:33 CDT 2007

   I had the same issue with the remote functions on the microphone
going non-op after firing up the T2-135 in my DR-135T Mk II. the top
two [UP/DN] buttons work and the dtmf works, but the function buttons
[H/L], [MON], [0-9] etc. stopped working. going with what Scott posted
I hit the  [UP/DN] and changed to a non-data channel expecting the mic
function buttons to function again but they did not. i tried many
poweron/off, data/not-data combinations to try to get the mic
functions to work again but no joy.

It turns out when there is a GPS plugged into the DATA port (3.5mm
front) the mic functions don't work. i didn't notice it until i pulled
the GPS out and the mic functions started working again.  So I'm
pretty sure the T2-135 has nothing to do with it. I think the DR-135
its self is disabling the mic functions to drive the inbound data
connection on the 3.5mm port. I still need to play with it some more
tonight to see if a inactive 3.5mm plug, when plugged in, has the same
effect on the mic functions. if it doesn't i might wire a switch in so
i don't have to keep unplugging the GPS when i go voice.

Scott, if you get a chance to verify this it might be worth mentioning
in the T2-135 manual.


On 8/13/07, Keith VE7GDH <ve7gdh at rac.ca> wrote:
> Scott N1VG wrote...
> > I just tried it out myself on a DR-135T Mk II. I tested it with no TNC,
> > with a T2-135, and with an EJ-41U. In every case, the only thing that
> > matters is whether or not the radio is in digital mode.
> >
> > As you said, the up/down buttons work fine. As long as
> > you're in memory mode and not VFO mode, you can just hit up/down
> > to move to a non-digital channel and it'll work as usual.
> If I'm understanding you correctly, you say that the "remote functions" on
> the MIC work properly on your radio as long as the radio isn't in digital
> mode. They don't work for me and several others when the T2-135 installed.
> Do you have any idea why it is happening? So far, it sounds like my two
> radios (whichever one of the two I install the T2-135 in) and two or three
> others have the same symptoms. If the remote MIC functions work OK in your
> radio, there must either be some difference in the T2-135 itself or in the
> radios themselves.
> The two radios that I have here are a new DR-135T Mk III that I've had for
> just a few days, and a Mk II model that I've been using for an IRLP node for
> about 10  months, in other words less than 12 months old.
> 73 es cul - Keith VE7GDH
> --
> "I may be lost, but I know exactly where I am!"
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