Abstract
The techniques and instrumentation utilized by the National Bureau of Standards to calibrate field strength meters and interlaboratory transfer standards in terms of absolute rms cw field strength at frequencies from 10 kHz to 1000 MHz are described. Present services do not include broadband calibrations. Two general techniques of calibrating antennas are discussed: (I) The Standard-Field Method; (2) The Standard-Antenna Method; the use of each being dependent upon the type of antenna being calibrated and the frequency. The standard-field method is used to calibrate loop antennas from 10 kHz to 30 MHz, and the standard-antenna method is used to calibrate half-wave dipole antennas from 30 to 1000 MHz. The instrumentation used to calibrate the field strength receiver characteristics is illustrated; these measurements include the calibration of the signal attenuators, calibration of the overall linearity of the receiver, and calibration of the receiver as a two-terminal rf voltmeter.
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