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

Scott Miller scott at opentrac.org
Sat Aug 11 23:15:33 UTC 2007

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.  There appears to be no way to get it 
out of digital mode in VFO without using the front panel buttons, though.

Thanks for the T2-135 plug.  The regular T2 (in the metal case) is 
finally ALMOST ready to go.  Parts for the first 100 are on the way, and 
I've got a dozen hand-built units in testing now.  Most of those are 
already committed, but I might have a few left to sell.  Each one of 
those has 84 little surface mount parts, so there's no way I'm going to 
do those by hand on a regular basis.

It was too much trouble to make the high-side switch an option, so now 
they'll all ship with a solid state relay rated at 30A.  I don't think 
you'd want to run it as 30A continuously, but it's been demonstrated to 
be capable of driving a TS-2000 at 100 watts with no problem.

Also, there are ferrite chips on all of the radio, serial, and accessory 
connections now to cut down on RFI issues.  Not that I've ever had a 
problem with any board in that metal case, but what the heck, they're cheap.


Keith VE7GDH wrote:
> Can someone with a DR-135TP (or the T version with the EJ-41U TNC added) 
> please confirm that the "remote control" functions on the MIC still work 
> OK? i.e., do the MON, H/L, V/M, CALL buttons etc. still function?
> This is in reference to a DR-135T with a T2-135 installed. The T2-135 is 
> working OK, but most remote functions on the MIC are not. With the 
> switches in the right position, it can still transmit DTMF and the 
> UP/DOWN buttons work OK. The MIC works OK on another DR-135T and the MIC 
> from that radio shows the same symptoms when connected to the radio with 
> the T2-135 in it.
> I'm quite impressed by the T2-135. I haven't gone mobile with it yet, 
> but it looks like it will make a good "tracker", can also act as a 
> digipeater, is weather station capable, and with a laptop or PDA with 
> terminal program connected, it can also send and receive messages. It 
> can also be reprogrammed remotely via APRS messages. The T2-135 is just 
> $75 USD and the DR-135T is less than $200 CAD, and well under that in USD.
> www.n1vg.net/opentracker/documentation.php
> https://www.argentdata.com/catalog/product_info.php?cPath=22&products_id=55
> 73 es cul - Keith VE7GDH
> -- 
> "I may be lost, but I know exactly where I am!"
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