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National UFO Reporting Center
Sighting Report
Occurred : 8/2/2004
Reported: 8/2/2004 9:27:42 AM 09:27
Posted: 8/11/2004
Location: Southwest U. S.,
Simple passive Radar

Sir: With respect to "passive" RADAR, it is possible to assemble an extremely simple system to check out reasonably near reflections. I have done this in the past with good results. All one needs is a TV set disconnected from its cable input. A simple three or four element TV beam, hand held, is connected to the TV set.

Now, it is simple to show that light travels at very close to one foot per nanosecond. The horizontal scan rate of the TV is 15750 per second. This corresponds to 65 microseconds or 65000 nanoseconds. So 65000/5280 = 12.3 miles across the screen. If a duplicate image image of the TV program is seen and is moving, such as an aircraft it will be reflected and changing. I have used this and have seen secondary reflections from stationary watertowers and it is quite accurate.

Good luck, ((name deleted)) (elect engr)