CHARACTERIZATION OF A VHF AIR-GROUND CHANNEL
George A. Hufford, Anita G. Longley · NASA STI/Recon Technical Report N · 1974
The report describes a particular radio channel of the type proposed for use by the VHF Digital Data Link system. It is air-ground, has a narrow bandwidth, and uses frequencies near 120 MHz. Among the topics discussed are general signal levels, short-term and long-term variability, noise, multipath spread, and Dopler shifts. A bibliography is included which stresses the available data for this and similar channels.