March 1967 | Technical Memorandum IER TM ITSA
Monitoring techniques for evaluating useful frequencies for HF telecommunication circuits
Cite This Publication
James C. Blair, “Monitoring techniques for evaluating useful frequencies for HF telecommunication circuits,” Technical Memorandum IER TM ITSA, U.S. Department of Commerce, Environmental Science Services Administration, Institute for Telecommunication Sciences and Aeronomy, March 1967.
James C. Blair
Abstract: Significant channel characteristics of HF communication circuits are reviewed, with particular emphasis on their importance in the evaluation and selection of useful operating frequencies. Various theoretical and experimental results from several sources are analyzed and a number of techniques for determining channel characteristics are identified and analyzed. The best circuit monitoring system for many applications would include the oblique sounder supplemented by on-circuit CW measurements of Doppler spread and signal intensity, together with independent noise and interference monitoring by spectrum analyzer methods. For some applications, especially the broadcast service, backscatter sounding can be extremely valuable for determining frequency coverage.
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