UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Alf Fisher · 5th Aug 2020, 10:04 pm

Hi everyone,

I am building an interface box from scratch to connect a desk mike that plugs into a radio transceiver using a UK NATO plug.

I would like to know what the Jack plug connections should be in this case.

The wires I have are: mike high, mike low, PTT , ground.

My concern is that if the set is on, then the unkeyed PTT line will be at +28 volts and I don't want that to connect to the mike insert when inserting or removing the plug.

My thoughts are that the PTT line needs to be on the tip of the jack so it is the last contact to be made when inserting the plug and the first to be broken when removing the plug.

There could be a proper standard for this application so please can anyone advise.

Thanks in advance.

Alf

5th Aug 2020, 10:04 pm	#1
Alf Fisher Hexode Join Date: Sep 2005 Location: Potton, Bedfordshire, UK. Posts: 293	UK NATO Jack Plug connections Hi everyone, I am building an interface box from scratch to connect a desk mike that plugs into a radio transceiver using a UK NATO plug. I would like to know what the Jack plug connections should be in this case. The wires I have are: mike high, mike low, PTT , ground. My concern is that if the set is on, then the unkeyed PTT line will be at +28 volts and I don't want that to connect to the mike insert when inserting or removing the plug. My thoughts are that the PTT line needs to be on the tip of the jack so it is the last contact to be made when inserting the plug and the first to be broken when removing the plug. There could be a proper standard for this application so please can anyone advise. Thanks in advance. Alf