AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
MARCH 30, 2001
2-18-21
Page
13
Code
01
6 - OFF/ CLARIFIER CONTROL
− Concentric with the volume knob, and sharing the same OFF
position, the CLAR knob is used when receiving SSB signals
that may be slightly off frequency.
− The CLAR knob can help eliminate unnatural sounds when
receiving USB, LSB, or either of the telephone modes.
− The clarifier function does not affect AM reception, and is
disabled during transmit or when the CLAR knob is set to OFF
position.
− To operate the clarifier, rotate the CLAR knob clockwise from off
until the centering dot is visible on the knob skirt at the mid
rotation point. This is the neutral or zero shift position. From this
position, the CLAR knob is adjusted clockwise or
counterclockwise for the best clarity or the most natural sound of
the signal being received.
NOTE: When the audio quality of the received SSB signal is good
and natural sounding, the CLAR knob should remain in the
OFF position.
7. OFF/VOLUME CONTROL
− Turns system off and on and controls volume. Rotating the V
knob clockwise from the OFF position turns the system on.
Continued clockwise rotation increases audio level. When the
system is turned OFF, the discrete frequency or channel, and
mode of operation displayed on the CTL-230 will be stored in
nonvolatile memory and will be restored to the display the next
time the system is turned on.
NOTE: It is recommended that the HF-230 system be turned on
at least 15 minutes before use, to ensure frequency
stability under varying environmental conditions.
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