XTL 2500 Remote Mount DB25 Connector

[sacharoffm]

I was wondering if anyone can help me out. I am looking for the pin out of the DB25 connector on the front of the radio in a remote mount radio. I have searched all over and can not find any info. I have the pin out for the 26 pin accessory connector on the back.

 

[com501]

Which type of TIB do you have? One with TWO DB-25f on the front with a GCAI in the center or one with ONE DB25 with one GCAI and two BLUE control cable connections?

Of course, the next question begs, what are you trying to connect to it?

 

[sacharoffm]

I have the one with the Single DB25 with one GCAI and two BLUE control cable connections.

I am trying to connect this unit to a Zetron 4010 console. The unit right now is connected to a Motobridge through the Accessory connector on the rear of the unit. The radio is not used that much, but when it is patched it is used heavily, That is why I would like to see if I can double use the radio.

 

[com501]

Because of audio routing on the external PTT and how it interfaces, you would be better off configuring your 4010 local control card for high impedance and paralleling the connections on the rear connection to the MotoBridge. Remember that the Astro25 radio does NOT like having its audio grounded on the receive side, so you may need to use an isolation transformer or even an iso and a reduction pot to match levels close enough to be within the gain range for the 4010.

Do NOT overload the inputs to the 4010 card, and the best way to adjust the input AGC knee point is to use an analog channel in the XTL and set the 4010 from minimum until just where the gain levels off at the test point when you are increasing the pot, then back it off about 1/2 a turn. Then the AGC compression knee will work correctly for your console input.

 

[sacharoffm]

Thank you for this great information. Will give this a try when I am able to take the system down and test.