Design and Implementation of a 20KW Hi-Fi FM Transmitter

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Information about Design and Implementation of a 20KW Hi-Fi FM Transmitter

Published on March 12, 2014

Author: mylo21



The Design and Construction of the 20KW Hi-Fi FM Radio Transmitter was aimed at
achieving a broadcast coverage of the entire university community. Frequency
modulation theory and basic information about amplifiers, splitters/combiners as
well as antenna polarization were reviewed. A low power transmitter with two audio
inputs was implemented using three-stage amplification to serve as a prototype for
the 20KW FM transmitter. The output of the low power transmitter was coupled to a
monopole antenna for transmission. Simulation of the prototype design was done
using MULTISIM as the frequency response was obtained using MATLAB software
and the power budget parameters calculated using the Maxim Link Budget
Calculator. Design for the high power transmitter was approached using a block-byblock method and 24KW power output obtained. Subsequent test and measurement
carried out on the implemented design shows the transmitter operates with a stable
power of 41.1W at a receiving frequency of 106.8 MHz and an effective coverage
area of 314m
. Comparing the results obtained, the measured and calculated
parameters showed little variance in values thus implying that the 20kW transmitter
design proposed will work with minimal variance.

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