Bendix/King KY97A Tray wiring diagram

break audio line. J2 input goes to mic pin J1output to radio.
(leave the shielded ground wires disconnected. on audio)
Power use a 1k ohm resistor from 12v dc on pwr switch.
Ground run the ground wire to board ground
test and set echo level.
this will work for any radio. if the echo needs 12v instead of 8v remove the 1k resistor and just use a 1n4001 diode on the power wires . some models require 12v some are 5-8volts.

You need to have the programming software and cable. It is an older radio and I do not think it is Narrowband capable, meaning you cannot legally transmit in the USA.

Check this site

https://searchmanuals.net/search7/?keyword=%2Bowners+%2Bmanuals&gclid=CjwKCAiAqt7jBRAcEiwAof2uK4tkC2zLiNjeka-D3LjGuT_psLuFXyVd4hWflgspkQlk-AF4OMU1bxoCWwMQAvD_BwE

Here's a video null suggested as a solution to your problem from YouTube:


Homemade Radio Repeater COR using Bendix King LMH-3142 VHF Base/ Mobile Transceivers

I THINK this is the right schematic for your VHF.

http://www.aeroelectric.com/Installation_Data/KY97A.pdf

Hope this is helpful.
Good Luck!

if you have a cobra radio with four pin input and a turner road king 56 it goes like this. pin one shield and red wire,pin 2 white,pin 3 blue,pin 4 black and tape up the yellow wire it isn't used. the numbers should be on the plug if not look inside your jack on your radio. hope this helped

http://www.repeater-builder.com/bendix-king/b-k-index.html

did you radio works in this repeater before?