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Brenda Ann wrote:
"John - KD5YI" wrote in message . . . My guess is 3 mW. John The level is the same as emissions within the CB band: Sec. 15.227 Operation within the band 26.96-27.28 MHz. (a) The field strength of any emission within this band shall not exceed 10,000 microvolts/meter at 3 meters. The emission limit in this paragraph is based on measurement instrumentation employing an average detector. The provisions in Sec. 15.35 for limiting peak emissions apply. . . . The amount of power applied to an isotropic radiator which will generate 10,000 uV/m at 3 meters is 30 microwatts. This assumes that the 3 meter distance is in the far field, or that it's measured in the far field and extrapolated to 3 meters as though 3 meters were in the far field, which is the method and assumption used by the FCC. A simple dipole reduces the permissible power to about 23 uW, and ground reflections will typically nearly double the field strength, so a safe power level would be about 6 microwatts into a dipole antenna over ground for someone interested in conforming to the regulations. Roy Lewallen, W7EL |
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