EXPERIMENTAL MEASUREMENT OF SIGNALS ATTENUATION OF SOBI FM AT VHF ALONG ILORIN - JEBBA ROAD, NIGERIA.
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Date
2023
Journal Title
Journal ISSN
Volume Title
Publisher
NJP
Abstract
The study of propagation loss and fade margin of 101.9MHz (Sobi FM) signals along Ilorin (Lat 80541
& Long 40551E) – Jebba (Lat 90111N & Long 40821E) road at very high frequency (VHF) band was
done experimentally using spectrum analyzer. Alongside theoretical calculation to determine the
attenuation was also done using Friis and Free Space attenuation equations. The attenuation and fade
margin were measured regularly at intervals of two kilometers (2 km) from the base station up to a total
of sixty kilometers (60 km) along the chosen axis. The analytical models were obtained in form of
polynomial equations for received power, measured attenuation and the fade margin of the signals. The
calculated results correlated with the measurements (Correlation coefficient value R2 = 1), but gave
deviation when compared with the measurements. The variance of the results for the existing formula
with the measurements was adjudged to hills, valleys, trees and bends along the links. The highest value
of the fade margin obtained (75.89 dB) did not exceeded the receiver’s sensitivity of 80 dB, which
implies that the radio-signals can be improved, by increasing the height and the power of transmitting
antenna. This research provides information on improving Sobi FM transmission coverage and a guide
to upgrade or redirect their transmission signals appropriately.