June 1975 | NTIA Technical Memo OT TM 75 201

Digital transmission test results over a long ll-GHz line-of-sight link

Darren L. Smith; F. George Kimmett; Charles A. Samson; Albrecht P. Barsis

Abstract: Digital data transmission tests using a 12.6 Mb/s data stream (3-level partial response) were performed over a l16-kmline­of-sight link in northeastern Colorado using a carrier fre­quency in the 11.2 -11.45 GHz band. During the first four days of a five-day measurement period, the BER (bit-error­rate) was very low. High rates were observed only on the fifth day; they appear to be caused by multipath fading and related low signal levels. This report presents a discussion of the test implementation, of the test results, and of pertinent weather information for the test period.

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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