Construction of Radio Frequency Modulation (FM) Transmitter with Range of 100 Meters

Abstract

Information keep people abreast of what is happening outside and within their
environment. But communities in remote areas lack this opportunity due to poor
power supply in the country and outdated means of information dissemination in
use. Therefore, this project implementation of Frequency Modulation (FM)
transmitter received at a range of about 100 meters in free air is presented. It is
divided into voice detection and modulation part of the transmitter. The
components utilized in the construction are; microphone, resistors, transistors,
capacitors, inductor and antenna. These preferred/selected components are
due to their availability and low cost. The cost of media information
dissemination constitutes major problem to individuals and institution that may
wish to adopt radio broadcast as means of electronic media. The study was
therefore carried to construct an FM transmitter that is cheap in price,
affordable, portable and simple in maintenance to eradicate the traditional use
of town criers. Based on the procedure adopted and the tests carried out, the
specific findings include; appreciable range with frequency of transmission
obtained on power source devised from 9V battery has been achieved in this
works. The implemented FM transmitter transmits sound waves produced by
human voice via a microphone to receivers at target range. The successful
completion of this study has indicated that practical frequency modulated FM
transmitter requiring low power can be constructed for further studies in areas of
signal coupling technique need to be carried to improve the range of
transmission.