Investigation of Transmission Impairments on Bauchi F. M. Broadcast through Field Strength Measurements

Abstract

Measurements of relative field strength were carried out on the FM Broadcasting frequency of 94.57 MHz of a 20kW transmitter of the Bauchi Radio Corporation. Measurements were taken at regular intervals up to a distance of 70 km along five different routes starting from Bauchi (10.25 N, 9.75 E) in each case. There was a rapid deterioration of the field strength with distance owing to factors such as shadowing or diffraction and meteorological conditions in the lower atmosphere. Coverage gaps existed in shadowed valleys. Fill-in stations are required in regions of poor service to provide limited local coverage. Even when the transmitting antenna has adequate terrain clearance listeners can help improve their own reception by sitting their antenna to minimise local shadowing losses.


Nigeria Journal of Pure and Applied Physics VOLUME 1, AUGUST 2000, pp. 28-32