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vhfprop!.doc
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1988-08-27
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VHFPROP! is a versatile and accurate program for computing VHF
and UHF line-of-sight (ground wave/terrestrial) propagation
range. Inputs are extensive, including individual antenna
heights, transmitter power output, antenna gains, line losses,
and required receiver input level for the desired signal-to-noise
ratio or quieting.
The output is the calculated range, in miles (all values are in
English measure) for a particular reliability level ranging from
50% to 99.9%.
The program is based on a well-accepted propagation model by
Egli. One limitation to the program is that it does not
incorporate a terrain roughness factor correction. Therefore, the
predicted range may be overly optimistic if terrain has high
points in the path between the stations.
Reference: John J. Egli, "Radio Propagation above 40 Mc. over
Irregular Terrain", Proc. IRE, October 1957, pp 1383-1391.
Further described and validated in: "Review of Propagation in the
470-890 MHz. Band with Emphasis on Land Mobile and Cellular
Systems." by F.H. Palmer. Communications Research Centre Report
Number 1288, February 1976. Avaliable through N.T.I.S. as report
number N76-27450.
This program, VHFPROP! appears as one of several programs in "The
Meteor Burst Communications Handbook", by Jacob Z. Schanker. This
should be available through N.T.I.S. late in 1988 or early 1989.