Mr. Kebbeh,
Thanks for shedding some light on this. With our limited knowledge on this
technology, I really think that an understanding of the debate could be
much clearer with some background information.
It just goes to show the immense know-how and resourses the gambia has to
take advantage of from this pull of technologically savy fellow gambians.
Again thanks for adding to the ISSUE.
Best Regards,
Ablie Njie-Lekbi
>From: "Morrie K. Kebbeh" <[log in to unmask]>
>Reply-To: The Gambia and related-issues mailing list
><[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: New GRTS FM digital radio
>Date: Wed, 27 Feb 2002 13:35:29 -0800
>
>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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