Help. Where does Legacy Antenna Plug in

That would be my guess...looks like the radio board. Only one wire on the plug? How is the socket wired?

It's on the radio board, so there's only one logical choice.

Guys, I am not familiar at all with TMCC/Legacy.  I think you are telling me that the separate square circuit board on top is the "radio board", from which it follows the answer is socket #3. 

CJack, that is a two pin connector. My photo shop label covered part of the socket 

It's a two-pin connector.  Yes, the #3 is the correct place.  #1 & #2 are the rear and front electrocouplers respectively.  #4 is the wrong size for the plug, so that's not a good choice.

Thank you

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John Sethian posted:

Guys, I am not familiar at all with TMCC/Legacy.  I think you are telling me that the separate square circuit board on top is the "radio board", from which it follows the answer is socket #3. 

CJack, that is a two pin connector. My photo shop label covered part of the socket 

I knew it was two pins, but what I was thinking was if you looked at the socket on the radio board, underneath probably, and saw that there was only one trace connection going to the 2 pin socket, then that is most likely the antenna input.

I haven't seen these newer Legacy boards yet, but I see the 455 KHz...nothing broken yet  

Both pins are connected.  Set your meter to continuity and hit each pin to confirm for yourself.