Sorry for such a simple question, but the "experts" on sci.electronic.design say you all probably have the answers I need. Here's the scene:
I've got four people in the vehicle, each one wearing a sound-deadening headset because the ambient noise level is something on the order of 100 dBa. I'd like each of those people to be able to talk and have the other three hear what that person is saying, and to answer back with all of the other people hearing the answer.
A party line telephone, if you will, with full duplex from all four stations.
THe kicker is that I want to do it wirelessly. It is a trivial job to do this sort of intercom by stringing wires all about the vehicle, but I'm finding out nontrivial in the extreme to do it without wires.
Oh, and since each of these people has to "wear" this device, it would be nice if we could do it on micropower with minimal battery weight.
Thanks,
Jim