Accession Number : AD0845221

Title :   Timing and Framing Techniques for Troposcatter and Line of Sight, Volume II.

Descriptive Note : Rept. no. 4 (Final) 1 Sep 67-31 Dec 68,

Corporate Author : MARTIN MARIETTA AEROSPACE ORLANDO FL

Personal Author(s) : Gilbreath, Roy E. ; Horrell, Joel L. ; Eddy, Wesley L. ; Williard, Merwin W. ; Brummett, Chester C.

Report Date : DEC 1968

Pagination or Media Count : 233

Abstract : This final report describes the timing and framing developmental model, framing computations, and testing. Phase-lock loop timing and 2-mode framing devices were tested with the exploratory development model which was designed specifically for the purpose. The model was used with GFE simulator and tropo link transmission equipment to demonstrate its ability to meet the requirements and to verify analyses. The tests showed that the model met all performance objectives. The study results indicated that: (1) special techniques are needed for longer patterns in marginal tropo and that AGC threshold control improves marginal tropo framing; (2) emphasis on security may require special retiming considerations; (3) improved sync maintenance during fast fades is possible with an extended range phase lock loop. (Author)

Descriptors :   (*COMMUNICATION AND RADIO SYSTEMS, TROPOSPHERE), (*DATA TRANSMISSION SYSTEMS, TACTICAL WARFARE), CORRELATORS, LOGIC CIRCUITS, SHIFT REGISTERS, SIMULATORS, CALIBRATION, AUTOMATIC GAIN CONTROL, ATTENUATION, TIMING CIRCUITS, PHASE LOCKED SYSTEMS.

Subject Categories : Atmospheric Physics
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE