Mohinder,

Thanks for  explaining the basics of the technology to those who are
ignorant to the topic.  I think it made it easier for the ordinary person to
understand.

Yus:

Thanks for your response as well.

Now that Mohinder has explained some of the possible economic consequences
of owning a digital radio, it will definitely help the  non technical G-Lers
to make better analysis of the ISSUE.


Thanks and Best Regards,

Ablie Njie-Lekbi




>From: Mohinder Bains <[log in to unmask]>
>Reply-To: The Gambia and related-issues mailing list
><[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: Daft or Inept
>Date: Thu, 28 Feb 2002 12:47:24 +0000
>
>Jungle Sunrise wrote
>"
>What I meant to write was that all FM transmissions are NOT digital. I
>could not send a rejoinder to rectify what I wrote because I had used up
>all
>my allowable postings.
>
>"
>
>The contents of your posting conveys otherwise which leads me to suspect
>you
>have a misconception of what digital Radio is.  Being one of the best ( or
>rather the best) Engineer in the Gambia makes one wonder what your
>credentials are if you cannot even answer a simple question within your
>career domain.  Woe betide the gambian if all her Engineers are your like.
>
>
>
>Mr Njie,
>
>Yus was right when he said
>
>"
>>one has to have a digital radio to receive >transmissions
>>from a digital radio station.  "
>
>I think your impression of digital transmission is the opposite to what it
>is.  It is more expensive and limited in distance ( but this can be
>overcome
>by strategically placed transmitters or by satellite.  Digital signals are
>also susceptible to distortion and noise
>which, is usually minimized by building into receivers a centre-sampler
>circuitry for determining the threshold value for received signals ( i.e
>anything above the threshold value is decoded as 1 and otherwise 0) since
>noise may degrade the signal to a great extend.
>
>Digital broadcasting requires the use of a large amount of bandwidth due to
>the encoding procedure involved ( i.e the modulation method, quantizing and
>coding of the signal etc).  It would require a long posting to delve into
>the modalities of how this is achieved, which is best left for later.
>
>To obtain clarity of sound  with digital systems, distance is a limiting
>factor and more complex circuitry is needed at the receiver to decode the
>signals. The current radio sets do not have the required circuitry for
>suitable reception.
>
>In Europe, digital radio receivers are selling at around £200 - £300
>per unit, which in my opinion would dent the pocket of any ordinary Gambian
>whether abroad or in the Gambia.
>
>May be in time, the cost of these units may be affordable to the masses and
>only then would the justification for setting up such stations be realised.
>Don't misunderstanding me on this point.  What I am trying to say is that,
>if this stations are to be commercially viable, they need to reach a wide
>audience, and  the only way to achieve this is if these audience can tune
>in.
>
>I think Yus would enlightened further on your questions.  However, the
>basics of AM and FM (for Analog transmission) follows:
>
>AM modulation produces two sidebands (Upper & Lower) after modulation and
>both sidebands carry the same information.  sometimes one of the sideband
>is
>suppressed to save on transmitting bandwith.  This technique is known as
>Suppressed-Single-Sideband (SSB).
>
>
>FM Modulation on the other hand produces a series of sidebands on both
>sides
>of the carrier( the frequencies of these sidebands are scaled according to
>their distance from the carrier ),  and since all these sidebands carry the
>same information, one tends to tune get a clear reception.
>
>I think this enlightened you on these aspect.
>
>Thanks
>Mohin
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>_________________________________________________________________
>MSN Photos is the easiest way to share and print your photos:
>http://photos.msn.com/support/worldwide.aspx
>
><<//\\>>//\\<<//\\>>//\\<<//\\>>//\\<<//\\>>//\\<<//\\>>
>
>To view archives of postings, go to the Gambia-L Web interface
>at: http://maelstrom.stjohns.edu/archives/gambia-l.html
>To contact the List Management, please send an e-mail to:
>[log in to unmask]
>
><<//\\>>//\\<<//\\>>//\\<<//\\>>//\\<<//\\>>//\\<<//\\>>




_________________________________________________________________
Chat with friends online, try MSN Messenger: http://messenger.msn.com

<<//\\>>//\\<<//\\>>//\\<<//\\>>//\\<<//\\>>//\\<<//\\>>

To view archives of postings, go to the Gambia-L Web interface
at: http://maelstrom.stjohns.edu/archives/gambia-l.html
To contact the List Management, please send an e-mail to:
[log in to unmask]

<<//\\>>//\\<<//\\>>//\\<<//\\>>//\\<<//\\>>//\\<<//\\>>