Abstract

One of the propagation attenuation that should be calculate when using radio communication in air navigation is atmospheric propagation attenuation at night. The presence of propagation attenuation will decrease acceptance on the side of the Automatic Direction Finder on aircraft that emitted by Non Direction Beacon because of the loss. Reduced power received due to loss of tolerance allowed is 1.575 dB of transmit power , although the value is already resulting in the appointment of an error on the needle indication of Automatic Direction Finder compass. It required an analysis of the influence of the atmosphere on the propagation attenuation of Non Direction Beacon transmit power and receive power Automatic Direction Finder. By doing Link Budget calculations with the parameters then obtained emittance Non Direction Beacon of 85.1957 dB and acceptance occurs when the atmospheric propagation attenuation of 82.3981 dB. From the calculation is concluded that atmospheric propagation attenuation, especially at night when the sun goes down greatly affect receptivity

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