A Standard for RF Modulation Factor

A modulation factor standard has been developed to support the Federal Aviation Administration's requirements for a measurement capability for the ILS and VOR navigation systems. The standard consists of both a precision modulation meter and a stable amplitude-modulated signal source. Although...

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Bibliographic Details
Main Authors: Arthur,M G, Reeve,G R
Format: Report
Language:English
Subjects:
AMPLITUDE MODULATION
AUDIO FREQUENCY
Cybernetics
DYNAMIC RANGE
INSTRUMENT LANDINGS
INSTRUMENTATION
MEASUREMENT
Modulation factors
Radiofrequency Wave Propagation
RANGE FINDING
Ratio meters
SIGNAL GENERATORS
STANDARDIZATION
TEST METHODS
Tone generators
VERY HIGH FREQUENCY
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Summary:A modulation factor standard has been developed to support the Federal Aviation Administration's requirements for a measurement capability for the ILS and VOR navigation systems. The standard consists of both a precision modulation meter and a stable amplitude-modulated signal source. Although designed primarily for ILS and VOR signals, it has general purpose capabilities within an rf range of 10 MHz to 500 MHz and an af range 20 Hz to 20 kHz. Measurement uncertainty is less than 0.11 percent modulation below 90 percent modulation for ILS/VOR tones of 90 Hz and above, and is somewhat greater at 30 Hz. Included are a circuit description and an error analysis. (Author)