139. Radio-Fuze Detecting Set 42 (Zündersuchgerät 42)

The radio-fuze detecting set 42 can be used insead of the clockwork-fuze detecting set 41 (par. 138) for the detection of buried mines. This detecting set makes use of the varying magnetic field set up by such mines. This equipment is used primarily to unearth charges using Soviet F-10 radio-controlled fuzes (TM 5-223A). Each radio-fuze detecting set 42 has a total weight of 926 pounds and consists of the following items:

5

E 132 search coils, each with supports, 600 feet of cable on a reel, and reel stand.

1

EVB 9 amplifier with two headsets.

2

12 NC 28 batteries.

a. Search Coil. The E 132 search coil consists of a circular disk about 21 inches in dia-meter with three sockets on each side for the supporting legs. The search coil itself (fig. 180) is formed of several thousand of fine wire, forming a tuned circuit for about 350 cycles per second, and a trimming condenser. The cersuit is connected to the grid of an RV 12 P 2000 electron tube preamplifier stage mounted in a metal case in the lower part of the circular disk. The search coil is connected to the EVB 9 amplifier by a four-core shielded cable. The search coil is most ef-fective when set at right angles to the magne-tic lines of force coming from a buried mine. Supporting legs are provided to hold the search coil upright.

Figure 180. Circuit diagram of the E 132 search coil.