| 31. | On the ground, to obtain directional radio beams with a well-defined navigable course, crossed loop antennas were used initially.
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| 32. | Using conventional radio receivers and loop antennas for direction finding, radio operators could determine which of the signals was false.
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| 33. | :: Yep, AM radio needs either a ( relatively ) bulky Loop antenna, or a * very * long wire.
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| 34. | This has practical advantages for makeshift or home construction and may be found in resonant loop antennas or crystal radios.
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| 35. | In amateur radio, loop antennas are often used for low profile operating where larger antennas would be inconvenient, unsightly, or banned.
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| 36. | In this system the loop antenna is replaced with a single square-shaped ferrite core, with loops wound around two perpendicular sides.
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| 37. | The Adcock antenna is an arrangement of four monopole masts that act as two virtual loop antennas arranged at right angles.
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| 38. | For non directional portable use, a short vertical antenna or small small loop antennas are tuned with parallel capacitors for this purpose.
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| 39. | Rotating the sense coil in the field coils has the same output as rotating the entire loop antenna in the original field.
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| 40. | This was accomplished by rotating a loop antenna to maximise ( or minimise ) the signal, thus " pointing " to the storm.
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