[GreenKeys] Polar Relay

[Jerry Barnish]

Gentleman:
 
First, to all who have helped me in the past, thanks again.
 
I am wiring in a polar relay on board the USS New Jersey.
I am not familiar how they work. The purpose is to run normal on 
the military transmitters versus reverse. I am told I need to insert dc
loop 
current on the ouput of the relay to key the tranmitter.
 
The polar relay has an dc bias power supply. This is on the coil
yet the input dc loop current keys the polar relay. 
 
Any help, words of wisdom and technical advice for this 
old broken down technician?
 
Thanks everyone.
 
Jerry WB2CAK