Bell OH-58A Technical Manual page 217

MATERIALS/TOOLS REQUIRED: None
PROCEDURAL STEPS:
1. Be sure that FM No. 1 (1 AN/ARC-114)
circuit breaker and BAT switches on the
overhead console are off.
2. Remove vent screen from left side of
horizontal console to obtain access to
No. 1 FM radio connectors.
CAUTION
Do not pull on cables when dis-
connecting cable connectors.
Be careful to avoid any unneces-
sary strain on the cables.
NOTE
If No. 2 FM radio and secure-
voice control indicator are
not installed, blank panels
may be removed to obtain
additional access to con-
nectors.
3. Disconnect cable connectors from J1,
J2, J3, and J4.
4. With a screwdriver, turn the six
fasteners that secure the unit to the
mounting panel one-quarter turn
counterclockwise.
5. Slide the No. 1 FM radio out of the
mounting panel.
6.
Locate coax cable (2 ARC 114-101A)
stored in console and use it to replace
coax cable (1 ARC 114-101A). Connect it
to J2.
NOTE
Both left and right-hand homing
antennas may also be used as
emergency transmitting anten-
nas by using either coax cable
(1 ARC 114-102A) or (1 ARC 114-
103A) connected to J2.
ELECTRICAL AND AVIONICS SYSTEM
7.
To replace No. 1 FM radio, be sure
that FM 1 circuit breaker and BAT
switches on the overhead console are
off.
8. Slide the No. 1 FM radio into the
mounting panel and turn the six faste-
ners one-quarter turn clockwise to
secure the unit.
9. Connect the coax cables to the rear
of the No. 1 FM radio.
10. Attach vent screen to left side of
horizontal console.
NOTE
The above procedures apply to the
No. 1 FM radio and to the No. 2
FM radio when it is installed,
except that J3 and J4 are not
used on the second radio.
OPTION 2: Construction of Replacement
Antenna.
LIMITATIONS: Some loss of antenna gain
and radio transmitter power.
PERSONNEL/TIME REQUIRED:
. 1 Soldier
. 1 Hour
MATERIALS/TOOLS REQUIRED:
. Cable, Coax RG-58U or Other Available
Coax
. Tape, Electrical (item 46, Appx C)
or Equivalent
. Resistor, Carbon, 1 Watt 52
percent.
PROCEDURAL STEPS:
1. Determine length of wire needed for
the rad iating element by using Figure
11-45. Example:
TM 55-1520-228-BD
±5
11-45