A Doppler Radio-Direction Finder
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چکیده
adio-direction finding has gained a lot of interest in recent years especially on the VHF and UHF bands. There are many different approaches to determining the origin of a radio transmission. Each approach has its advantages and disadvantages. An experienced RDFer learns to make use of several methods to master the art. Directional antennas with good front-to-back ratios (such as a Yagi or quad) are simple to use and very effective in obtaining bearings from a fixed location. Because of their physical size, however, such antennas are a bit awkward to use when you’re driving around in a vehicle trying to narrow the search area. Mounting a 2-meter, fourelement Yagi or quad to a car window can be a safety hazard. A much more practical method of narrowing the search area uses four /4 λ mag-mount antennas and the Doppler principle.
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تاریخ انتشار 2001