Operation 3-52, Figure 3-65 clarifier, Figure 3-66 mode button – BendixKing KHF 990 User Manual

Page 89

band suppressed carrier mode of emission is not used to transmit
SELCAL signals, therefore ARINC HF ground station transmitters
switch to the AM mode when transmitting SELCAL signals. The KTR
953-01 is designed to detect SELCAL signals transmitted in the AM
mode even though the mode selector is in a single sideband mode.

CLARIFIER

The CLARIFIER knob is unique to SSB communications and is not
used when operating in the AM mode. Because of off frequency
ground station transmissions, the audio voice quality from the KHF
950/990 may sound unnatural. The CLARIFIER can help eliminate
this unnatural audio quality by slightly shifting the KHF 950/990
receiver generated frequency to match the frequency of the ground
station signal.

To operate the CLARIFIER, pull the knob out and rotate the knob in
either direction until the audio quality is optimized. When the knob is
pushed in, the CLARIFIER has no effect. When voice quality is good
and natural the CLARIFIER knob should remain pushed in.

MODE BUTTON

Operation

3-52

KHF 950/990 Pilots Guide

Rev. 0

Dec/96

FREQ KHZ

CHANNEL

CLARIFIER

PULL
ON

SQUELCH

OFF

VOLUME

STO

PGM

MODE

FREQ CHAN

12345.6 99

USB

Figure 3-65 Clarifier