I just felt like I was back in Physics Class. That was


wonderfu Mr. Kebbeh. You made it very simple and

understable. I would have to save this one, and please


test me on it next week.

Gibby

--- "Morrie K. Kebbeh" <[log in to unmask]> wrote:
> Mr. Gassama,
>
> I’d like to differ with you on the following
> statement: “All FM transmissions are digital”.
> Frequency Modulation (FM), Amplitude Modulation
> (AM),
> and Phase Modulation (PM) are only used in the
> analog
> world. In digital transmission, they are referred to
> as FSK, ASK, and PSK respectively. The principle of
> Frequency Shift Keying (FSK), Amplitude Shift
> Keying,
> and Phase Shift Keying is to convert a digital
> signal
> into an analog signal so that the digital bit stream
> can be effectively transported over and analog
> system,
> such as the airlink of a radio or a cellular
> network.
>
>
> Mr. Njie,
>
> Here is some information on AM and FM. I hope this
> helps.
>
> Amplitude Modulation: The amplitude of the
> carrier/transporting signal is modulated or changed
> according to the magnitude of the message signal.
> For
> example, if you raise your voice over the phone, the
> amplitude of the carrier signal will rise
> accordingly.
> So the loader you speaker, the larger the amplitude
> of
> the carrier signal.
>
> Frequency Modulation: The frequency of the
> carrier/transporting signal is modulated or changed
> according to the size of the message signal.
>
> Here are some advantages of FM over AM:
>
> 1.Better output signal or less interference, thus,
> better voice quality.
>
> 2.Smaller interference between neighboring stations.
> 3.Less radiated power.
>
> 4.More capacity (users) in the case of cellular or
> PCS
> networks.
>
>
> Disadvantages of FM over AM:
>
> 1.More bandwidth.
>
> 2.Very expensive because of the use of complex
> receivers, transmitters, and filters.
>
>
> Ms. Astrid,
>
> I think the word digital is incorrectly used. If
> that
> is not the case, then “Gambians will now have to
> have
> a special digital receiver”. From what I understand,
> no known ‘digital radio’ station is commercially
> operating in the U.S.
>
> Do you wonder what happens if you try to use your
> regular AM/FM analog receiver to tune to a ‘digital
> radio’ station? Well, you will experience very
> unpleasant beeps and buzzes. I hope this helps.
>
> Cheers,
>
> Morrie K.
>
>
>
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