The Radio Information Board

I"m having some trouble getting the Public Address function to work on my TK730. I know I have the right pins in the right connectors, a proper speaker, and the right programming on the radio. But when I enter PA mode, key the mic, and talk, nothing comes out of the speaker (I've tried a few di...

I have a TK730G and am curious about the horn alert. The pinout manual says I can use the HA pins for other things and I'd like to know what.