![]() Non-Residentisl Perimeter Protection Systems ![]() G = the numeric gain of the transmitting antenna relative to an isotropic source Table 10.2 FCC Frequency Table for Frequencies Near 50 MHz Because it is the electric field that causes interference to authorized radio communications, and since a particular electric field strength does not directly correspond to a given level of transmitter power, most of the Part 15 emissions limits are specified in field strength.Īlthough the precise relationship between power and field strength can depend upon a number of additional factors, a commonly-used equation to approximate their relationship is: Microvolts per meter (fiV/m) are the units used to describe the strength of an electric field created by the operation of a transmitter.Ī particular transmitter that generates a constant level of power (Watts) can produce electric fields of different strengths depending on, among other things, the type of transmission line and antenna connected to it. Watts are the units used to describe the amount of power generated by a transmitter.
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