Comparing the Flux of the Cosmic Background Radiation, Man-Made Telecommunication, and Radio Terrestrial Thermal Background Noise Over Channel Bands In the 0.5 - 1000 MHz Range
In 1964, when using the 20-foot horn-reflector antenna at the Crawford Hill Laboratory in Holmdel, New Jersey, Penzias and Wilson discovered the Cosmic Background Radiation while attempting to observe weak radio signals from the Milky Way Galaxy . In “Origins,” Neil deGrasse Tyson estimates that background radiation accounts for 1% of noise in between television channels . Because Earth is enveloped in this background radiation I became curious to know what effect, if any, the CBR has on telecommunications. In deriving the dimensionless form of the Planck function and realizing that it is acceptable to utilize the Rayleigh-Jeans law, I calculated the flux of the CBR through integration of the Rayleigh-Jeans law over the frequency bandwidths that the Federal Communication Commission regulates for cell phone, radio, and television channels. The greatest value calulated is on the order of 10−14 W . For comparison, the weakest local telvision signal is m2 on the order of 10−7 W . This means that locally the ratio of the flux between the CBR and m2 man-made signals is never greater than 10−7 W . This insures that the CBR virtually has m2 no interference within the frequency bands in use for wireless communications. However, determining other possible sources of interference and concluding that the earth is only other main factor; calculating the flux of the thermal background noise of the earth, with a temperature of 290K, to be 1.242 × 10−18 W and comparing it to the CBR it is found m2 that the CBR is approximately 1/100 the strength of the earth . I confirm this estimate by Tyson for the CBR’s percentage of the static noise in an off-band channel.
Carthage College Senior Thesis 2009 Adam Ferg.