Double loop receiver-transmitter combination

Details Double loop receiver-transmitter combination Double loop receiver-transmitter combination

1977-12-21

1979-08-07

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 28, 325371, 343112D, 343719, G01S 516, H04B 500, H04B 1500

Patent

active

041639774

ABSTRACT:
A double loop receiver used in conjunction with a transmitter broadcasting at low frequencies as a vertical magnetic dipole. The two loops are connected with their planes parallel in a resonant circuit, thereby cancelling atmospherics generated by distant thunderstorms and allowing the receiver to receive only the signal produced by the near transmitter. The loops are rotated around a horizontal axis perpendicular to the connecting line between the loops until a maximum signal is obtained. The direction of the connecting line is varied until the maximum signal shows the gradient and the direction to the transmitter. By noting the position of the loops and the loop angles with respect to the horizontal, the position of a transmitter buried in the ground can be determined. This system has particular utility in locating lost miners buried in a cave-in. Additionally, the double loop receiver concept can be used to detect subsurface ore deposits.

REFERENCES:
patent: 2992325 (1961-07-01), Lehan
patent: 3046549 (1962-07-01), Kalmus
patent: 3900878 (1975-08-01), Tsao
patent: 3975735 (1976-08-01), McCullough et al.

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