Where To Find Full-Duplex Walkie Talkies?

Question

I'm looking for full-duplex walkie talkies but I can't seem to find any? Does anybody know where to get them? I want to use a handsfree-throat-mic but be able to talk and hear at the same time with a group of people on the move.

Answer 1

Can't be done.  As you know, full duplex means transmitting and receiving at the same time.  It usually takes several cavities or tuned circuits to allow transmitting and receiving at the same time.  Far too bulky to carry around. There is also a problem is that you want several radios for a group of people.  All can hear at the same time of course, but there's no point in trying to talk and hear at the same time.  To do so means that somebody else is transmitting while you are transmitting.  The two transmitters would interfere with each other and all you'd hear would be the heterodyne between the two, or three, or four, transmitters.  

  

Well, it can be done, but would take a fair amount of infrastructure.  Cell phones do this.  They transmit and receive at the same time but each cell phone has it's own frequency when it is doing so.  Their transmit and receive frequencies are so far apart, 45 MHz, that they don't need cavities to separate them.    So if you call a cell from your cell, you're talking through the cell site.  Your phone and the other phone are using completely different transmit and receive frequencies and the cell site connects the audio from one frequency to the other.