From: "Fred Hambrecht Sr."
Subject: Re: what is the difference between a transceiver and transmitter?
Date: Sun, 19 Jan 2003 06:14:34 -0500
Organization: Posted via Supernews, http://www.supernews.com
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I think you may mean "sideband". when two frequencies are mixed together,
the result is the two original frequencies as well as the sum and the
difference of the two frequencies.
In a radio we have a carrier frequency ( where you tune your dial to) and
the audio frequencies from the microphone.
The process of mixing them together is called modulation. The original audio
frequency is not transmitted, but the carrier and the carrier plus audio and
the carrier minus audio are.
An example your listening to a radio station on 600Khz and the audio is a 1
kHz single tone. You would see the carrier at 600Khz and two sidebands. The
lower sideband would be at 599 and the upper at 601. This would be a
standard AM signal.
It is possible to transmit only the sidebands and the receiver reinserts the
carrier. This is called Double Sideband Suppressed Carrier. It is further
possible to filter one of the sidebands and transmit the remaining one. This
is called Single Sideband.
Other combinations are possible such as carrier plus 1 sideband. This is
normally the method used to transmit a TV picture in NTSC used in the USA.
SSB is used because by eliminating the carrier we effectively double our
power out, removing the other sideband doubles it again, and because of the
way it is received it is doubled once again in the receiver. That is to say
that a 10 Watt SSB signal is equal to an 80 watt AM station over a
Hope this answered your question.
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"Laplace" wrote in message
> allow me -top posting
> What is a "Sidebank"?
> Anthony Q. Bachler wrote in message
> > A transceiver unit has a transmitter and a receiver in it. A
> > just transmits.
> > --
> > "If a million people say a foolish thing, it is still a foolish thing."
> > Anatole France [Jacques Anatole Thibault] (1844-1924)
> > "Laplace" wrote in message
> > news:firstname.lastname@example.org...
> > > what is the difference between a transceiver and transmitter?
> > >
> > >