Accession Number : AD0460579

Title :   SPECTRUM ANALYZER MYTHS.

Descriptive Note : Technical note,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AERONAUTICAL ELECTRONIC AND ELECTR ICAL LAB

Personal Author(s) : Cushman, R. W.

Report Date : 15 FEB 1965

Pagination or Media Count : 38

Abstract : Conventional explanations of spectrum analyzer operation, which are based on mathematical concepts, have led to misconceptions of the physical time domain phenomena involved. This technical note, using a physical approach, describes the transients that pulsed signals produce in spectrum analyzer circuits, and interprets the resulting 'spectrum displays.: By using a narrow-band communications receiver, it is shown that 'spectral lines,' as generally conceived, do not exist physically. The displays are shown to be a measure of transient responses of the spectrum analyzer I-F amplifier, rather than indicators of the frequency distribution of a radar transmitter output. Proper interpretation of spectrum analyzer displays as time domain action provides useful information concerning pulsed radar transmitter performance. (Author)

Descriptors :   (*SPECTRUM ANALYZERS, LINE SPECTRA), (*RADAR EQUIPMENT, TEST SETS), PULSE ANALYZERS, NARROWBAND, TRANSIENTS, INTERMEDIATE FREQUENCY AMPLIFIERS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE