Microwave Data Transmission Test Program Digital Applique Unit.

Abstract : The object of the Microwave Data Transmission Test Program - Digital Applique Unit (DAU) was to design, construct and system test a Digital Applique Unit. The DAU is a time division multiplex/modem equipment which permits conventional FDM/FM microwave radio equipments to be converted to all digital transmission. The DAU is designed to accept and deliver one or two mission bit streams (MBS) with rates up to 12.672 Mbps and a single service channnel bit stream (SCBS) of 192 Kbps, and provide an error rate of 10 to the minus 7th power for a carrier to noise ratio of 24 db or less with a packing density of 2 bits/Hz. A uniquely designed receiver switch module of the DAU permits the attainment of relatively high diversity gain without the introduction of switch-induced error or loss of bit count integrity. Provisions for both on-line and off-line BER measurements are provided as part of the built in performance assessment capability. (Author)