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TM 11-5820-890-10-8
RF PWR (RF POWER)
This control allows the operator to
adjust the level of radio frequency
(RF) power and related range of
operation. Basic rule is to use the
least amount of RF power needed
to
communicate
with
other
stations.
Figure 5-5. RF PWR Switch
RF POWER SWITCH POSITIONS AND USES
POSITION
PURPOSE
LO
Provides voice operational range of approximately 200-400 meters. This
(Low Power)
positron IS used extensively by units in closely deployed situations. Actual
range iS dependent upon weather, position, line of sight, Interference, and
various other factors.
M
Provides voice operational range of approximately 400 meters to 5 kilometers.
(Medium Power)
Manpack radio operators can conserve battery life by selecting lowest effective
RF power setting.
HI
Provides voice operational range of approximately 5 to 10 kilometers and data
(High Power)
transmission range of 1 to 5 kilometers, the latter depending upon data rate
(BPS) as well as the other factors cited under LO above.
PA
This setting applies only to vehicular long range radios using a power amplifier.
(Power Amplifier)
Approximate voice range provided is 10 to 40 kilometers; data range of about 5
to 25 kilometers, dependent upon the data rate being used and various other
factors.
DIM CONTROL
This control enables the operator
to adjust the level of brightness of
the RT display. Turning the knob
clockwise increases the level of
light; turning it counterclockwise
dims the display light. When using
night vision goggles, DIM is to be
set fully counterclockwise.
Figure 5-6. DIM Control
VOL/WHSP
The
Volume/Whisper
control
enables the operator to adjust the
audio level.
Turning knob
clockwise increases level and
counterclockwise decreases  it.
The whisper feature is activated by
pulling out on the VOL knob. In the
WHSP position, the operator can
speak softly (whisper) and the
message will be heard at a normal
Figure 5-7. VOL/WHSP
audio level.
5-8


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