imagine standing net to a brilliant searchlight
Von chentianyu, 01:44In Washington, NRL scientists headed by Dr. Page improved the power and range of their earliest radar sets by using the most powerful ham radio transmitter tubes of the day and got 10-20 times the rated power out of them by designing circuits that turned them on and off for milliseconds at a time in a sequenced, 6-tube ring oscillator. Operating in the 200 MHz range, the very first test aboard the USS York spotted an airplane 45 miles away, over the horizon! This was in 1938 and by Dec. 1941, 19 such sets were aboard ships in Pearl Harbor when it was attacked. Not one was turned on. A radar trainee in a shore installation saw the echoes 15 minutes ahead of the attack and reported them, but was ignored. Higher command thought the echoes where from an inbound flight of bombers from San Francisco.
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Radar was further advanced when the NRL came up with the rotating display for cathode ray tubes, called Plan Position Indicator (PPI) closely followed by the development of the "Duplexer" which allowed both transmitter and receiver to use the same antenna. To understand the importance of this, imagine standing net to a brilliant searchlight which is turned on for a fraction of a second, after which you are supposed to see reflections from the sky with you two eyes. Impossible, because you have been blinded for at least a few minutes by the brilliant flash. This was similar to the blinding of the receiver to incoming signals.
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