Accession Number : AD0649573
Title : DIVERSITY COMBINING IN THE AN/UCC-1C(V).
Descriptive Note : Memorandum rept.,
Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C
Personal Author(s) : Jewett,W. M.
Report Date : 09 MAR 1967
Pagination or Media Count : 33
Abstract : The diversity combining in the AN/UCC-1C(V) microelectronic FSK frequency division multiplex equipment is shown to be inadequate under simulated, periodic fading conditions. Long time constants in the limiter circuitry prevent the discriminator output from decreasing equally with the input signal under relatively slow fading conditions. Under static, high S/N conditions the combining varies between equal gain and ratio squared when the amplitude of the input signals are within 6 db of each other. With an 8 to 10 db differential, the smaller signal does not contribute to the combined discriminator output. Improvement in the performance of the equipment under simulated fading conditions can be obtained by reducing the time constants in the AGC amplifier and the limiter circuit. Extension of this work is planned to cover other fading conditions. (Author)
Descriptors : (*TELEGRAPH EQUIPMENT, *DATA TRANSMISSION SYSTEMS), MICROELECTRONICS, DIGITAL SYSTEMS, MULTIPLEXING, CIRCUITS, LIMITERS, AMPLIFIERS, AUTOMATIC GAIN CONTROL
Subject Categories : Non-radio Communications
Distribution Statement : APPROVED FOR PUBLIC RELEASE