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The crossed-loops DF antenna atop the mast of a tug boat. These would be used with a B–T radiogoniometer for navigation by taking measurements against shore-side transmitters. During experiments in 1907, [ 8 ] [ b ] Ettore Bellini and Alessandro Tosi noticed that they could cause the received signal to be re-radiated by forming a loop with ...
The AN/SPS-67 is a solid-state replacement for the AN/SPS-10 radar, using a more reliable antenna and incorporating standard electronic module technology for simpler repair and maintenance. The AN/SPS-67 provides excellent performance in rain and sea clutter, and is useful in harbor navigation, since the AN/SPS-67 is capable of detecting buoys ...
This allowed the U-boats to detect radio signals in the 1.5 m band used by SW and other UK radars, warning them of any nearby radars long before that radar could detect the U-boat. Metox could not detect microwave-frequency radars like the 271, putting the Canadian ships at a significant disadvantage to their allies. [ 13 ]
Antennas are generally sensitive to signals only when they have a length that is a significant portion of the wavelength, or larger. Most antennas are at least 1 ⁄ 4 of the wavelength, more commonly 1 ⁄ 2 – the half-wave dipole is a very common design. For longwave use, this resulted in loop antennas tens of feet on a side, often with ...
Both U-boat antenna versions were 1,400 mm (4 ft 7 in) wide by 1,000 mm (3 ft 3 in) in height, and total overall dimensions of the antenna frame was 1,540 by 1,022 mm (5 ft 0.6 in by 3 ft 4.2 in). There are two types of radar transmitter for the FuMO-61 Hohentwiel U and FuMO-65 Hohentwiel U1, the Type F431 C1 and the Type F432 D2 .
The output of each was sent to its own looped wire, or as they are referred to in this system, a "field coil". Two such coils, one for each antenna, are arranged close together at right angles. The signals from the two antennas generated a magnetic field in the space between the coils, which was picked up by a rotating solenoid, the "search ...
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