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Direction Finding Antenna Size

February 11th Fact-of-the-Day

I.E.E. Journal, 1949, Vol. 96, Part III, p. 321, contains, what was at the time, a groundbreaking paper by H.G. Hopkins and F. Horner entitled 'Direction-Finding Site Errors at Very High Frequencies.' It provides a thorough mathematical analysis of all the various types of standard direction finding antennas used today, including comprehensive determination of bearing-errors due to signal reflections for each type of antenna. The calculations are complex. A strong mathematical background is needed to follow them. However, the outcome is easy to state. Regardless of the type of direction-finding antenna used, if signal reflections are present, the larger the antenna, the smaller the bearing errors. Nonetheless, the 'magic' of integration makes it possible to obtain the bearing measuring advantage of a large antenna with a small one. ©2005 Martek International All rights reserved.


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