Abstract:
Dissemination of information is the basis of all communication around the globe and a
backbone for societal development. In the era of technology, radio frequency (RF)
application has become eminent in information transmission. Inevitable there would
be Public address system due to inherent limitation in human voice. A public address
(PA system) is an electronic amplification system with a mixer, amplifier and
loudspeakers, used to reinforce a given sound. This project elucidates simple design
and cost-effective digital transmitter-receiver to replace emerging traditional PA
system which apparently has shortcomings in long distance transmissions and signal to-noise ratio (SNR). The project aims at developing a phase-locked loop FM
transmitter with a radius of 5 km for public announcement, the design output is
simulated using multisim and PIC simulator. The project serves as information
medium for a community of 1000 people instead of town carrier (gongon beating). The announcement passes through a microphone attached to the transmitter, which
converts the sound energy to electrical energy; the electrical signal transmitted was
received through the antenna of the FM receiver placed within in a range of 2 km-4
km away from the transmitter. A loudspeaker mounted on pole broadcast information.
The result of the project demonstrate that the prototype designed consumes 800 mW
with a 70 dB output and signal radius of 5 km. The input used was 12-18 V DC with
76.0-76.8MHz frequency range. This accomplished the intended objectives for the
community information center. Finally, depending on the availability of further
advance technologies, this type of FM Transmitter/Receiver could be further
improved with incorporation of sound sensitive circuit in the design for utmost
efficiency and reliability in information delivery.
Description:
A DISSERTATION SUBMITTED TO THE DEPARTMENT OF DESIGN AND
TECHNOLOGY EDUCATION IN THE SCHOOL OF RESEARCH AND GRADUATE
STUDIES, UNIVERSITY OF EDUCATION WINNEBA, IN PARTIAL FULFILMENT
OF THE REQUIREMENT FOR THE AWARD OF MASTER OF TECHNOLOGY
(ELECTRICAL AND ELECTRONICS ENGINEERING) DEGREE.
OCTOBER, 2015