Question
A simple technique called the “body fade” helps with locating these things. Individuals searching for these things might use a three-element quad or yagi with a high front-to-back ratio and look for “nulls” and “peaks”. Though it was originally invented to detect lightning strikes, a system nicknamed “huff-duff” displays the location of these things on an oscilloscope. A sport known as “fox hunting” combines orienteering with finding these things. During World War II, Robert Watson-Watt was tasked to determine if the Nazis could use one of these things as a “death ray”, which eventually led to the (*) Chain Home project. The task of finding the bearing to one of these things is simply called “direction finding”, which along with GPS is often used by aircraft or ships for navigation. For 10 points, antennas are used to detect signals produced by what things through amplitude or frequency modulation? ■END■
ANSWER: radio transmitters [accept transmitters; accept any description of something that produces radio waves; accept foxes before “fox hunting”; prompt on “waves” or “signals” with “what kind of wave/signal?”; prompt on “antennas”, “beacons”, or “towers” with “what kind of thing does that act as?”] (Britain’s Chain Home project was the first radar detection system.)
<AW>
= Average correct buzz position
| Conv. % | Power % | Average Buzz |
|---|
| 100% | 0% | 143.20 |
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