United States Department of Transportation
i
The Effects of Primary Power Transmission Lines on the Performance of Loran-C Receivers in Experimental Terrestrial Applications
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1979-07-01
[PDF-3.03 MB]
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Abstract:Tests were conducted to measure the effect generated by high-voltage transmission lines with and without supervisory carrier signals on the performance of typical LORAN-C receivers which might be used for land vehicle applications of the LORAN-C Navigation System. The tests were performed on four high voltage transmission line configurations owned and operated by the Tennessee Valley Authority. Transmission lines were tested with 60Hz power impressed and absent and carrier signals impressed and absent. Data are plotted for three secondary time differences measured using the East Coast LORAN-C chain. Carolina Beach was the master and Nantucket, Mass., Jupiter, Florida, and Dana, Indiana were the secondaries. Signal to noise ratios for the secondaries were also measured and recorded. The test area chosen had extremely good LORAN-C signal coverage. In general, with the carrier of and line de-energized, acceptable receiver performance was obtained to within approximately plus or minus 100 meters from the center of the line. With the line energized, useable performance degrades to a point about plus or minus 200 meters and with asynchronous carrier signals performance is unreliable at distances less than plus or minus 300 meters. With synchronous interference the receivers would not operate properly at 1000 meters either side of the line.
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