--
There are only 10 kinds of people in the world.
Those who count in binary and those who don't



I suppose there'll have to be another little box to plug into the
headset jacks. The audio portion seems relatively straightforward,
but have you designed a robust method of keying the mic _only_ when
intended, that won't be affected by stray transmissions?

No, this is going to be an "owner airplane" design only. I haven't decided
yet what the "base station" is going to look like, but I could be convinced
to make it an option with an audio panel so that you get all the functions
in one rack mounted box, complete with volume and squelch control on the
intercom line.

With four mic channels coming in and two PTT switches on the front two
control wheels, it is quite easy to mute the intercom when somebody hits the
PTT switch (either one) and then logically decide which of the two PTT
switches are active. You can optionally prioritize the PTT switches or if
both of them are active, both mic audios will be linked to the transmitter
as well.



It's hard to argue with Motorola, but it would seem that with so many
cell phones supporting BlueTooth now, the additional ability to
communicate with the phone might be a plus.

Nope. KISS and BURP.

Jim