The FCC has published the OET #65 bulletin and its revision. The latest document specifies how FM, TV stations and communication antennas must protect the public and workers from excessive exposure to RF radiation. The FCC's more stringent rules require broadcasters to protect uncontrolled areas at 20 percent of the former maximum. Controlled areas, where access is limited, continues to be protected at the former levels. Our new version of RFHAZ allows graphical examination of various antennas at numerous RF level scales from a minute observation with maximums not exceeding 50 microwatts/sq centimeter to a maximum scale level of 3000 microwatts/sq centimeter.
RFHAZ takes the work out of calculating radiation levels as it quickly and accurately predicts the percentage of the maximum A.N.S.I. standard non-ionizing radiation levels found near FM and TV transmitter antennas for various powers, antenna types, heights and distances from the antenna.
For FM calculations, the program combines formulas from the new OET #65 bulletin with EPA researched element and array patterns as published in PB85-2458-68, "Engineering Assessment of the Potential Impact of Federal Radiation Protection Guidance on the AM, FM and TV Broadcast Services."
For TV and DTV calculations RFHAZ allows the user to apply the manufacturer's field elevation values on the path of interest from the antenna to the ground. With RFHAZ you can produce graphs of the radiation density from the base of a tower to points 100 meters from the base. RFHAZ will compute power densities and percentages of the maximum A.N.S.I. standard for the frequencies in use.
RFHAZ calculations consider the emissions effect in a mix with the antenna array pattern and individual element patterns. In the FM mode, in addition to a graph, RFHAZ will produce a tabulation of both the vertical and horizontal radiation density levels and their sums from the tower base to 100 meters from the base. RFHAZ considers the impact of antenna arrays having from 1 to 16 bays as well as those with less than full wave spacings.
For emitter calculations other than broadcast, RFHAZ contains a calculator that will work for various communication antenna situations.
The FCC now requires a statement as to the environmental impact of non-ionization radiation on the general public and workers for all station filings having an ERP above 100 watts. RFHAZ is just the tool to help you stay in full compliance. The program was developed through consultation with the Commission and its output matches a similar program used by FCC engineers. RFHAZ operates on the PC and requires no external database for operation.
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