Who knows how to add radio to a new playable ship for SH3?

[Chinese U-47]

Hello everyone,as you see I'm making SH3 playable warship mod right now.And I've worked out most of its questions,but I still have a important problem:How to add radio to my ship?I mean my radar and so on works well,but I can't seed or receive telegraphic message.So,what's the main point connect to the radio?
My English isn't well,so you may get some wrong grammar in my word,forgive me:huh: