Jason wrote about Re: GSM-900 on Date: 1 Apr
2005 09:02:14 -0800
> But since we transmit in x freq, then the receiver must tune to x feq
>> in order to receive the signal right? Why transmit at x freq and
>> receive at y freq?
> The answer is "Full Duplex" vs "Half Duplex."
Think of a Family Radio Service (FRS) walkie talkie. You transmit and listen on the same frequency. If you're transmitting, you can't hear. If you're listening, you can't transmit. Only one side can speak at a time. If both transmit at the same time, you can't hear each other, and anyone else on the same frequency hears garbage as you get walked on.
Transmit at X, and the other side transmits at Y, you listen on Y and they listen on X. Thus both of you can talk simutaneously, like a land line telephone.
Chris