I interfaced an Argent Data Systems ADS-SR1 simplex repeater to a TK-x90 series (e.g. TK-690, TK-790, TK-890) radio and it required some mods, so I thought I'd list them here for future experimenters.
Modifications to the radio:
Move R641 to R640 (to get external MIC instead of data)
Jumper SB, a set of pads next to F501 (for +12v power to DB-25)
Modifications to the ADS-SR1:
Turn dip switches 1 and 2 ON; 3 and 4 OFF.
Lift/Remove R12
Short (jumper across) R11
Remove SJ1 (or lift/remove R9 if it is easier)
DTMF control setting ##1071 (2x gain on input audio)
Pins:
DB25 Pin 7 to RJ45 Pin 2 (ground).
DB25 Pin 13 to RJ45 Pin 3 (Mic In).
DB25 Pin 4 to RJ45 Pin 5 (PTT) Aux Input 3 MUST BE PROGRAMMED FOR EXTERNAL PTT!
DB25 Pin 17 to RJ45 Pin 6 (Radio Receive Audio Out).
DB25 Pin 14 to RJ45 Pin 8 (+12v). DON'T INSTALL BATTERIES IN REPEATER.
I found the biggest problem was getting high enough audio to the radio from the repeater. That's why I ended up doing what I did with R11 and R12 (thanks to an old post from the Argent owner on the Simplex Repeaters Yahoo group for that info).
I tried using TOR (tone operated relay) on one of the radio aux outputs instead of VOX, but never got it to work consistently. Not sure why. VOX is good enough for my application though so I didn't continue down trying to make it work.
Modifications to the radio:
Move R641 to R640 (to get external MIC instead of data)
Jumper SB, a set of pads next to F501 (for +12v power to DB-25)
Modifications to the ADS-SR1:
Turn dip switches 1 and 2 ON; 3 and 4 OFF.
Lift/Remove R12
Short (jumper across) R11
Remove SJ1 (or lift/remove R9 if it is easier)
DTMF control setting ##1071 (2x gain on input audio)
Pins:
DB25 Pin 7 to RJ45 Pin 2 (ground).
DB25 Pin 13 to RJ45 Pin 3 (Mic In).
DB25 Pin 4 to RJ45 Pin 5 (PTT) Aux Input 3 MUST BE PROGRAMMED FOR EXTERNAL PTT!
DB25 Pin 17 to RJ45 Pin 6 (Radio Receive Audio Out).
DB25 Pin 14 to RJ45 Pin 8 (+12v). DON'T INSTALL BATTERIES IN REPEATER.
I found the biggest problem was getting high enough audio to the radio from the repeater. That's why I ended up doing what I did with R11 and R12 (thanks to an old post from the Argent owner on the Simplex Repeaters Yahoo group for that info).
I tried using TOR (tone operated relay) on one of the radio aux outputs instead of VOX, but never got it to work consistently. Not sure why. VOX is good enough for my application though so I didn't continue down trying to make it work.
