The technique now employed at the National Institute of Standards and Technology (NIST) for calibrating antenna factor at frequencies from 25 to 1000 MHz uses a standard "Open-circuit" half-wave receiving dipole to measure the electric field strength. Unfortunately, the dipole responds to ambient fields over a large frequency range. This approach is compared with a three-antenna method which uses an accurate automatic network analyzer with 120 dB dynamic range to measure insertion l o s s between the transmitting and receiving antennas. A field site having a 30 m X 60 m ground screen which acts as a good reflector is used. reflection can be calculated and compensated for. The new insertion l o s s technique permits faster measurements with greater repeatability and reduction in calibration uncertainty, especially at frequencies above 7 5 MHz.
AbsiPoci'-A technique h described which utilizes a single generator and ft delay line for the roeasurement of frequency-domain ph»se noise i£if)) in synthesized signal generators. Terms are defined and equations developed for theory and calculations of normalized phase-noise sidehand power in a 1-Hz bandwidth offset 20 kHz from signal frequencies of interest. The system de^ribed covers the range from 0.45 to 2000 MHz. The fuE»ction and contributiun of each component in the measurement system is presented. Advantages of this method are dis* cuääed and a brief error analysis is given.
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