THE FEASIBILITY MODEL OF THE DIGITAL COMMUNICATIONS SET, AN/GSC-4 FIELD TEST PROGRAM
Abstract
A field test program was carried out to determine the feasibility of the AN/GSC-4 digital communications set. The AN/GSC-4 feasibility model was designed as a high-speed digital data modem for conveying binary data over toll telephone facilities. Laboratory tests were conducted to determine error rate characteristic as a function of white and impulse noise, frequency translation, and modulation. Field tests were conducted to determine the performance of the system over commercial phone lines, SAGE tropospheric scatter link, White Alice tropospheric scatter network, electronic switchboard, and the 465-L remote communications complex breadboard. The laboratory tests pointed out that a S/N ratio db was necessary for a binary error rate of 1 x 0.0001 when operating at 5400 bits/sec; for 2400 bit/sec operation, an error rate of 1 x 10 to the 6th power could be realized with SNR of 16 db with synchronization modulation. Without sync modulation a 3 db improvement is obtained. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 20, 1961
- Accession Number
- AD0264873