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channels 0 through 9 as well as the least significant digit of
PRE set channels 10 through 19 and the MAR 176 ITU
channels.
(11) Frequency Select Switches / FREQ Display:
These 5 switches allow selection and display of discrete frequencies
from 2.0000 through 29.9999 MHz in 100 Hz steps in the NORM
mode and to select user preset frequencies / channels in the PGM
mode for loading and for later use in PRE mode. All switches are
momentary in both directions to select digits up or down, in any
order. The function of each of the 5 switches is further explained as
follows:
(a) The left most switch selects the MHz digit, 2 through 29.
(b) The second from left switch selects the 100 kHz digit, 0
through 9.
(c) The center switch selects the 10 kHz digit, 0 through 9.
(d) The second from right switch selects the 1 kHz digit, 0
through 9.
(e) The right most switch selects the 100 Hz digit, 0 through 9.
(12) FAULT Display / Indicators:
Any system fault detected during power on, normal operation or selftest
is indicated by a fault code displayed in the FAULT display and,
if appropriate, an illuminated CP / RT / CT annunciator.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
Page 15
May 30/02
Revision 7
B. HF-9000 Series Control Panel:
(See Figure 5 and Figure 6.)
(1) General:
The HF-9000 series control panel is used to control and display the
modes, channels, frequency selected and faults. It contains all
function switches necessary to operate the HF system.
(2) VOL (Volume) Knob:
The volume knob adjusts the audio level as desired by the operator.
Clockwise rotation increases the volume level, while
counterclockwise rotation decreases the volume level. Whenever
the volume control is moved, the volume level is momentarily
displayed in the FREQ / CHAN display.
(3) SQL (Squelch) Knob:
The squelch control is adjusted to mute undesired background noise
when voice communication is not present. The proper squelch
setting is obtained by rotating the SQL knob counterclockwise to
disable squelch (SQL 0) and then clockwise one click (SQL 1). The
receiver will mute after a short delay. If intermittent noise persists,
the SQL knob can be further rotated clockwise one click (SQL 2) or
two clicks (SQL 3).
The SQL control has no effect when in TST, PGM, EXT or SBY
mode. The squelch level is momentarily displayed in FREQ / CHAN
function after each change of SQL control.
(4) DSBL (Disable) Pushbutton:
Depressing the DSBL pushbutton disables the squelch circuit,
enabling the user to determine if there is traffic on the selected
frequency without adjusting the SQL control.
(5) CHAN (Channel) Knob:
The CHAN knob provides selection of all maritime and emergency
preprogrammed preset channels and user-programmed preset
channels. Using the CHAN knob, the channel will increase or
decrease by one (i.e., 2236, 2237 or 2236, 2235, etc.) regardless of
where the cursor is positioned. To increase or decrease channels by
more than one (i.e., 2236, 2246, 2336, 3636, etc.), the CURSOR
knob is used to position the cursor under the desired channel digit
and the VALUE knob is used to set the digit.
(6) FREQ / LD (Frequency / Load) Pushbutton:
When in PGM mode, depressing this switch loads the desired
receive-transmit emission mode, frequency and channel data into
the receiver / transmitter’s non-volatile memory for the 99 userprogrammable
preset channels for simplex operation. For halfduplex
operation, the FREQ / LD switch and microphone key must
be depressed to load transmit data. By depressing the switch, the
channel and frequency display recycles in CHN mode; when
operating in EMR or MAR mode, the emergency (receive and
transmit) or maritime (receive) frequency will be displayed. To view
the maritime transmit frequency, depress the FREQ / LD switch
while keying the microphone. When in the TST mode and the
OPERATING MANUAL
2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
Page 16
May 30/02
Revision 7
HF-9000 system has failed, depressing this switch will sequence
through the fault diagnostic codes.
(7) CURSOR Knob:
The CURSOR knob moves the cursor left or right for selecting the
display section to be changed.
(8) VALUE Knob:
The VALUE knob increases or decreases the value in the display
section (OPR, MODE, FREQ / CHAN or PWR) selected by the
cursor.
(9) Cursor Display:
The cursor, a segmented line display, is positioned (by using the
CURSOR knob) under the display section (OPR, MODE, FREQ /
CHAN and PWR) to be changed. After selection of the desired
　
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