PPT FOR TX

7/31/2019 PPT FOR TX

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In electronics and telecommunications a transmitter orradio transmitter is an electronic device which, with the

aid of an antenna, produces radio waves.

The transmitter itself generates

a radio frequency alternating current,which is applied to the antenna.


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* There are 7 short wave transmitters, There frequency responseis b/w 3.2 -26.1 Mhz.

They are classified in 3 categories:

* BBC(BROWN BOVERI CORPORATION FROM SWITZERLAND),

2 Transmitters

* CEC(CONTINENTAL ELECTRONIC CORPORATION FROM U.S.A),

2 Transmitters

* THALES(THOMCAST CORPORATION FROM SWITZERLAND),

3 Transmitters


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This transmitter was put in khampur on 8th

December1995.

This transmitter was designed by CONTINENTAL

ELECTRONICS CORPORATION of UNITED STATES OF

AMERICA.


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The CEC transmitter is mainly divided into 13

units.


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Transmitter control provides metering of transmitteroperating parameters, push-button control and computercontrol of transmitter.


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Modulator is a devicewhich is used for varyingphase, frequency oramplitude of carrier wave,

with the instantaneousvalue of RF voltage.


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*This unit employs aseries of Amplifying

stages beginning witha variable RF level ofupto approximately 1volt output fromsynthesizer .


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This unit converts anunbalanced 75ohminput to balanced 300ohm output . The

output from this isconducted through two150 ohm transmissionlines to the 300 ohmtransmission site line.


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This unit includes the primarypower disconnect breaker tothe transmitter, which is alsoa safety part of transmitter.


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This unit includes powerdissipated resistors, awater pump, and a heat

exchanger to safelydissipate the full RF outputpower of the transmitter.Twos resistors, each 150ohms are immersed in a

flowing column of waterwhich is then pumpedthrough an external heatexchanger.


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Transmission Line, includes two conductor balancedtransmission line supported on ceramic insulators withina rectangular metal duct. Transmission line impedance is300 ohms.


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Cooling system which is ahigh-purity water loop

including pump with pumpstarter assembly, backuppump & water-to-air heatexchanger. In additionthere is a pump devoted tocooling circulation duringBlack heat standbyoperation.


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An antenna (or aerial) is an electrical device whichconverts electric power into radio waves, and vice versa.It is usually used with a radio transmitter or radio

receiver.


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PPT FOR TX

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