At 05:56 PM 1/14/97 -0500, Brad Dolan wrote:
Mmmm. I'm told that, on most cellphone calls, a scanner will present both sides of the conversation on the same frequency. Usually one side will be louder. Perhaps there's some feedback from a party's receiver back into his transmitter?
It's called duplex echo. Whenever you convert 2-wire audio to 4-wire (two pair) you're going to get a reflection. The cell-phone company can't perfectly match the impedances connecting to the local phonecos, and so a little signal gets reflected. Actually, this is desireable locally because it acts as feedback to the speaker, as long as the reflection is kept within reason. The result is that both sides of the communication are hearable in the radio signals. Jim Bell jimbell@pacifier.com