Introduction
This Field Expedient Handbook it deigned to provide Junior ofiicer® and noncommnsiored officer» with * handy guide Df expedients to overcome some seemingly insurmountable problems in a variety of area*. The handbook is no cure-all» but we hope it serves a definite purpose in the field nevertheless
The material herein was compiled from pa it article» in INFANTRY selected TM§ and FMs. and information provided by the USAI5 instructional departments. One chapter, however, is largely the result of work by one p*r*6n, 18-year-6ld R6b*rt S. Owondoii oi t ails Church, Va. In "direction and Time, M Owendoff outlines a unique yet simple method of finding dirsctioo — thc "shadow-tip method. M This method has been adopted by the U.S. Army, U.S. Air Force and many othor federal agencies and by the American Red
Cross and the Canadian Boy Scouts.
L COMMUNICATIONS Antennas
1. If the antenna for your AN/PRC-6 bccornca damaged, remove it ar.d replace .t with a 2- or 3-fooc length of WD-1 commo wire. The end of the wire should be placcd in the auxiliary antenna well. In order to transmit effectively, the wire must be held as close to the vertical position as possible. Try taping ox tying the wire to a small branch or piece o: wood to provide a brace for the wire. Both the wire and the brace will probably have to be supported by the individual using the FRC-S, however.
2. Normal range oi an AN/PRC. 10 «» S-H mil«» -with th* Antrrm»« AT. 272 and AT-271. Thi> range can be doubled by use of field wire VD-I/TT a» a field expedient. This method is recommended for u*e only when halted.
Materials needed for this type antenna are 55 feet of field wire WD-1/ TT, dry stick or peg to insu.ate field wire from tree, and a short piece of WD-I/TT to ground tie battery case iCY-240) oi the AN/PRC-10 radio, and a ground rod.
Dare uue end ui the 53-fuul gectiun Jf WD-l/TT and secure It to the rereptacl«* inside the auxiliary antenna connector; extend the field wire its full length up a tree or other suitable support, taking care to insulace the iield wire from the tree by use of a dry stick or peg. This end of the field wire ncsd not be bared, but simply tied to the peg. The peg must then be secured ta the tree by tying or some other method.
The battery case (CY-240) may be grounded by first baring both ends of a strip cf WD-l/TT wire, then attaching one «nd to one of the lower latches nr. th* battery case and attaching the other end to a groand rod.
The 53-fcot section oi field wire forms the vertical antenna and enables the operator to employ any frequency an the tec without any changes in the make-up oi hi« Held expedient antenna.
3. The Wave and Vertical Half Rhombic antennas are two Held expedient antennas that can be used with FM radio set». These antennas can ae constructed usmtf field wire, lance poles, or existing trees for support.
The antennas will :ransmit and receive in che direction oi the resistor terminated end. They will normally doubLe or triple the rated operating range of the FM radio set*.
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