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I am not very far from a powerful Loran station, Malone, FL LORAN, about 30 miles due south of Dothan, AL.
They run 800kW into a 700 foot monopole array. For more info see www.uscg.mil/d8/lorstamalone/default.asp
The signals are loud, in spite of the fact that my antenna is way too short and too low to be effective at that frequency. A tuned loop would probably work much better.
The first 3 pictures were taken with the analyzer in Peak-Hold mode for about one minute. The Loran signal being pulsed, a single sweep does not reveal the actual spectrum.
Screen shots courtesy of John Miles' 7470 emulator software with a Prologix GPIB-USB controller plugged in the spectrum analyzer.
This is a narrow Resolution Bandwidth (1 kHz) measurement. The RBW is too narrow to properly show the occupied spectrum. |
This is a shot at wider RBW (10 kHz) |
This is a shot with a 10kHz/div span and 10 kHz RBW. |
This picture is in the time domain, using the spectrum analyzer as an oscilloscope (5mS/div) You can clearly see the pulses, the different amplitudes come from different stations. |
This picture is in the time domain also with a faster sweep (2mS/div) |