TELECOM Digest OnLine - Sorted: Re: GSM-900

Re: GSM-900

Jason (cheanglong@gmail.com)
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?

Or I have misunderstood. Kindly enlighthen.

Thank you,

Jason

[TELECOM Digest Editor's Note: Because both microphones and
loudspeakers basically tend to do the same thing. Have you ever
plugged a microphone in to a 'speaker jack' or a speaker into
a 'microphone jack'? They can do each other's jobs quite well,
since, after all, each of them has something inside which tends to
'vibrate' to sound waves. If you ever had a microphone too close
to a speaker, or a telephone too close to a radio (during a call
in show you were talking on) you hear a squeal, or 'feedback', the
noise caused by the sound waves you or someone is producing going
around and around. Microphones not only 'hear' the principal sound
being given to them, they also 'hear' the amplified sound of the
original sound coming back to go around again. Changing the
frequencies eliminates a lot of that problem. My explanation is
probably not the best, but I hope it gives you the idea. PAT]

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