Design and Experimental Investigation for Improving the High Frequency Radio Communication Links between Benghazi-Libya and Sfax-Tunisia

摘要

In this study, we have experimentally planned to replicate the positive results of the application of ionospheric prediction method to design and improve the high frequency (HF) radio communication links between Benghazi-Libya and Sfax-Tunisia. The central radio propagation laboratory (CRPL) method of ionospheric prediction of the National Bureau of Standards (NBS) in U.S.A was used in the calculations of the optimal working frequencies for reliable HF radio communication links between Benghazi-Libya and Sfax-Tunisia. The results were drawn in the form of curves by using the computer. The computer was used to measure the received signal level variation of a frequency 17.500 Megahertz (MHz), which was transmitted with a power of 100 Kilowatt (KW) from the Tunis Republic Broadcasting station in SFAX city, directed to the east region. The measurements were taken during daytime's for winter (December, January& February) and summer (June, July & August) seasons.