Effect of Humidity on Tropospheric Received Signal Strength (RSS) in Ultra-High Frequency (UHF) Band (original) (raw)
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Force of Atmospheric Humidity on (UHF) Radio Signal
Radio signal strengths from Cross River State Broadcasting Cooperation (CRBC), (4 0 57'54.7''N, 8 0 19'43.7''E) transmitted at 35mdB and 519.25 MHz (UHF) were measured using a Cable TV analyser in a residence along Etta-abgor, Calabar (4 0 57'31.7''N, 8 0 20'49.7''E) simultaneously with the meteorological components (weather parameters). The components: atmospheric temperature, pressure, humidity and wind speed and direction with signal strength were measured half hourly from the residence in Etta-agbor for over 24 hrs to draw a justifiable inference on the impact of the atmospheric humidity on the radio signal. Results indicated that radio signal strength is inversely proportional to atmospheric humidity; provided that, other measured metrological components (weather parameters) were observed constant, including the wind speed and direction. The correlation of the signal strength and atmospheric humidity was r =-0.94 and SP = K was postulated, where S is signal strength (dB) and P is pressure (inHg).
Impact of Weather Components on (UHF) Radio Signal
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The effect of temperature and relative humidity on WE FM radio station (106.3MHz) Abuja, Nigeria, during Harmattan period was carried out with the measurement of frequency modulation (FM) signal strength by digital CATV signal meter and the temperature and relative humidity measured by digital Hygrometer/thermometer. It was observed that the signal strength was lower during the sunny period but higher in the morning and evening when there was little or no sun. It was also found out that both temperature and relative humidity have effect on the radio station signal strength with the correlation coefficient of -0.79 between signal strength and temperature, and 0.91 between signal strength and relative humidity.It was concluded from the correlation coefficient that signal strength is directly proportional to the relative humidity but inversely proportional to the temperature, but the effect of both was higher in harmattan than in rainy season when compared to our the result of our prev...
Impact of Atmospheric Temperature on (UHF) Radio Signal
— Radio signal strengths from Cross River State Broadcasting Cooperation Television (CRBC-TV), (4 0 57'54.7''N, 8 0 19'43.7''E) transmitted at 35mdB and 519.25 MHz (UHF) were measured using a Cable TV analyzer in a residence along Etta-abgor, Calabar (4 0 57'31.7''N, 8 0 20'49.7''E) simultaneously with the meteorological components (weather parameters): atmospheric temperature, atmospheric pressure, relative humidity and wind speed and direction to ascertain the impact of atmospheric temperature on radio signals. The meteorological components with signal strength were measured half hourly from the residence for over 24 hrs to draw a justifiable inference on the impact of the atmospheric temperature on the radio signal. Results indicated that radio signal strength is inversely proportional to atmospheric temperature; provided that, other measured metrological components were observed constant, including the wind speed and direction. The correlation of the signal strength and atmospheric temperature was r =-0.93 and the equation S =K/T at constant atmospheric pressure, relative humidity and wind speed and direction was postulated, where S, T and K are Signal strength, Atmospheric temperature and Constant respectively.
The Modelling of Tropical Weather Effects on Ultra-High Frequency (UHF) Radio Signals Using SmartPLS
IOP Conference Series: Materials Science and Engineering, 2018
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Tropospheric Influence on Low-band Very High Frequency (VHF) Radio Waves
Asian Journal of Advanced Research and Reports
The objectives of this study are to understudy the effects of temperature and relative humidity on low-band VHF signals, obtain a propagation model for signal transmission over Calabar and to ascertain the suitability of the free space propagation model for the study terrain. Results obtained shows that temperature and relative humidity has no effect on low-band VHF signals. The suitability of the free space propagation model for the study terrain failed, as calculated results underestimated path losses in the study area. Multiple regression analysis was used to obtain a suitable propagation model for the study terrain. However, since the studied meteorological variables has no effect on low-band VHF signals in the study area, the measured path losses could be attributed to foliage, hills, distance away from the transmitter and other components of the study terrain in which the signal is propagated.
Signal strengths measurements were obtained half hourly for some hours and simultaneously, the atmospheric components: atmospheric temperature, atmospheric pressure, relative humidity and wind direction and speed were registered to erect the effects of air density and dew point temperature on radio signals (electromagnetic waves) as they travel through the atmosphere and air radio wave refractivity. The signal strength from Cross River State Broadcasting Cooperation Television (CRBC-TV), (4057'54.7''N, 8019'43.7''E) transmitted at 35mdB and 519.25 MHz (UHF) were measured using a Cable TV analyzer in a residence along Ettaabgor, Calabar, Nigeria (4057'31.7''N, 8020'49.7''E) using the digital Community – Access (Cable) Television (CATV) analyzer with 24 channels, spectrum 46 – 870 MHz, connected to a domestic receiver antenna of height 4.23 m. Results show that: on the condition that the wind speed and direction are the same or (0 mph NA), the radio signal strength is near negligibly directly proportional to the air density, mathematically Ss / ∂a1.3029 = K, where Ss is Signal Strength in dB, ∂a is Density of air Kg/m3 and K is constant; radio signal strength is slightly inversely proportional to the dew point temperature; irrespective of the wind speed direction, mathematically, Ss x Td0.761 = K at same wind speed and direction, where Ss is Signal Strength in dB, Td is Dew point temperature in 0C and K is the constant; also, the air radio wave refractivity is slightly directly proportional to the air density, not taking into cognizance the wind speed and direction, since the radio refractivity formula is not a function of wind, mathematically, NR / ∂a0.4443 = K where NR is Air radio wave refractivity in inHg20F1/2%1/3, ∂a is Density of air Kg/m3 and K is constant; finally, the atmospheric radio wave refractivity is slightly directly proportional to the dew point; irrespective of the wind speed direction, mathematically Ss / Td0.2662 where Ss is Signal Strength in dB, Td is Dew point temperature in 0C and K is the constant.