Accession Number : AD0289840

Title :   LARGE POWER IMPULSE NOISE GENERATOR FOR EVALUATION OF RFI SHIELDING AND FILTERING

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : CLARK,D.B.

Report Date : 19 NOV 1962

Pagination or Media Count : 28

Abstract : A unique noise generator was developed which provides a large output of impulse noise pulses with gaussian amplitude and time distribution. Filters with 100 db's of attenuation can be tested for impulse characteristics with continuous spectrum impulse noise up to 1,000 mc. Evaluation of several commercial interference filters are presented and some show greatly reduced effectiveness against impulsive noise as compared to cw specifications. The noise generator, which consists of thousands of tiny capacitors charging and discharging through spark gaps in an inert atmosphere across a 50-ohm coaxial load, provides repetition rates to 20 mc and output levels to 170 db above 1 microvolt per megacycle peak. The impulse noise output can be easily modulated to simulate natural noise sources by modulating the ac or dc driving voltage. The noise generator construction and operation are described in detail and evaluation of its performance is presented. (Author)

Descriptors :   *NOISE GENERATORS, *RADIO INTERFERENCE, *SHIELDING, CAPACITORS, RADIOFREQUENCY FILTERS, TESTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE