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Improvements in or relating to direction finding systems, preferably for short wave or ultra short wave direction finding
Improvements in or relating to direction finding systems, preferably for short wave or ultra short wave direction finding
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机译：对测向系统或与之相关的改进，最好用于短波或超短波测向
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565,010. Directive wireless signalling. AGA-BALTIC AKTIEBOLAG. Jan. 20, 1943, No. 1029. Convention date, April 2, 1942. [Class 40(v)] A frame aerial 10, for short-wave directionfinding, is connected to the receiver by a transmission line 14, having such constants that #L1/Z0=tan alpha x, where L1 is the inductance of the frame and line, Z0 is the characteristic impedance of the line, alpha the wave-length constant of the line, and x its length. Such a line acts as a band-pass filter for several bands of frequencies, Fig. 2 (not shown), so that the same aerial may be used for several frequencies:' A switch 16, Fig. 3, may connect one of several tuned circuits A, B, C to line 14, either directly or through an additional length of line 17 or filter so chosen as to make the above equation hold good. Such a system may also be used for direction finding on long wave-lengths, e.g. where using the same aerials with separate goniometers for long and short waves, filters or impedances being arranged to keep the long waves out of the short-wave goniometer and vice versa, Fig. 4 (not shown).
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