After a pause of many years do to health issues and life getting in the way, I am finally trying to finish the last 1-2% of my Zodiac XL_B project.  I did a lot of the panel work a decade ago but there it has sat since then.  I know I'm a fossil trying to resurrect a long dormant project but I have a question for anyone using an Icom IC A210. I installed one when when I was actively building but have yet to use it.

The radio has a built in intercom.  I can't tell from reading the manual but when you are in intercom mode and press the PTT, do you transmit and then return to intercom when the PTT is released?  Or do you have to switch between intercom and Communications before transmitting? Any other info that would be helpful?  I'm trying to decide if I need a external intercom.