TM-9-2350-358-BD
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6
TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE
MARCH 1994
TM-9-2350-358-BD - Page 278 of 343
TM 9-2350-358-BD
13-8.
ANTENNA, DAMAGED OR MISSING - CONTINUED
Option 3:
Suitable mast.
Limitations:
Can only be used on a stationary vehicle and when a tree is available for suspension of the antenna.
Personnel/Time Required:
•
1 soldier
•
0.5 hour
Materials/Tools:
•
Cable, telephone, WD-1/TT, 1 roll (scavenge from available source)
•
Insulators (e.g. , glass, plastic, leather, nylon, etc. ), five required (scavenge from available source)
•
Rope (item 52, Appendix C)
•
Sticks or branches, 4 feet length, three required (scavenge from available source)
Procedural Steps:
WARNING
Do not touch bare wires on expedient antennas with the radio keyed.
You could get burned and/or
shocked.
1.
Determine length of wire needed for radiating element of a one-quarter wave antenna using the following formula:
Length (feet)
=
234 divided by frequency (MHz)
or
Length (meters)
=
71.37 divided by frequency (MHz)
EXAMPLE:
radiating element for a frequency of 50 MHz:
L (feet)
=
234 divided by 50 MHz = 4.68 feet
or
L (meters)
=
71.37 divided by 50 MHz = 1.43 meters
2.
Cut required length from telephone cable.
3.
Cut three reflector elements approximately the same length as radiating element.
13-10
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