RA-30 DB9 Pinout:

1 - Right (Aux or Tone) Output

2 - Left (Main or Voice) Output

3 - COS Logic Input - (pull near ground required for valid input)

4 - CTCSS Logic Input - (pull near ground required for valid input)

5 - PTT Output

6 - Discriminator / Detector or Receiver Audio Input - (level controlled by potentiometer)

7 - Local Control (Control Revert) Logic Output (Use with JU1 - see note below)

8 - Ground - (Digital and Analog)

9 - External Power (10 to 16 VDC) for optional filters. (Use with JU2 - position B)


Local Control is a logic option that can enable a secondary control method.  Some repeaters 
only require one logic lead change to enable internal controls. Not all repeaters have this 
control revert option, but for the ones that do, the RA-30 can feed such a line directly.  
This feature of enabling internal controls will allow the repeater to operate locally if the 
Asterisk application, computer, or RA-30 should fail.  JU1 controls the polarity of this 
function, explained below.

Jumper JU1 - Control Revert logic polarity.
Position A = DB9 pin 7 Logic is high when COMM OK LED not lit.
Position A = DB9 pin 7 Logic is low when COMM OK LED lit.
Position B = DB9 pin 7 Logic is low when COMM OK LED not lit.
Position B = DB9 pin 7 Logic is high when COMM OK LED lit.

Jumper JU2 - Optional audio amplifier/filter powering.
Position A = Optional filters are powered from USB 5VDC (not recommended).
Position B = Optional filters powered from external source 10 to 16 VDC.  Must be well 
filtered and should be regulated.