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(3) HF Antenna:
A single HF antenna is incorporated into the leading edge structure
of the vertical stabilizer. It is used by both HF systems.
4. Controls and Indications:
A. HF-190 Series Control Panel:
(See Figure 3 and Figure 4.)
(1) General:
The HF-190 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) ON / OFF Switch:
This switch selects the HF communications system ON or OFF.
Upon selection to OFF, data in the display will be stored in nonvolatile
memory and will be restored to the display when the system
is again selected ON.
(3) SQ (Squelch) Knob:
This knob is adjusted to mute undesired background noise when
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voice communication is not present.
(4) DSBL (Squelch 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) 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.
(6) LOAD Pushbutton:
This pushbutton stores the desired preset frequency, channel and
emission mode in the non-volatile memory of the receiver /
transmitter, ready for instant recall in PRE (preset) operation mode.
(7) Mode Select Knob:
The mode select knob is used to select the following modes:
(a) EM LO (Emergency Frequency Selection - Low): Manually
selectable international distress channel that operates on
2.1820 MHz.
(b) EM HI (Emergency Frequency Selection - High): Manually
selectable international distress channel that operates on
8.3640 MHz.
(c) NORM (Normal Frequency Selection): Manually selectable
mode allowing direct tune of any one of 280,000 frequencies
and any of the 6 emission modes (UV, LV, UD, LD, CW and
AM).
(d) MAR (Maritime Channel Selection): Manually selectable
mode allowing access to the 176 ITU Public Correspondence
Channels (and their receive / transmit frequencies) in the
maritime radio telephone network. All channels operate on
half duplex in the upper side band voice (UV) mode only. All
176 ITU channels are permanently programmed in the nonvolatile
memory. The last 10 channels used are also stored in
non-volatile memory to allow quick retrieval.
(e) PRE (User Programmed Channel Selection): Manually
selectable mode allowing access to one of 20 user
programmed channels, rather than manually selecting the
frequencies and emission mode.
(f) PGM (Program User Selected Channels): Manually
selectable mode used to program user channels.
(8) TEST Pushbutton:
The TEST pushbutton will initiate the self-test diagnostic routine. All
LCD displays and the three fault indicators will illuminate. If the
“receive” self-test detects no faults, the “transmit” self-test may be
initiated by momentarily keying the system. A tuning tone will be
heard during the “transmit” self-test. No frequency or modes will be
displayed unless the system is in MAR mode, in which case the
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selected maritime channel transmit frequency will be displayed while
the system is keyed.
NOTE:
After the test is initiated, the system must be keyed,
channel changed or selected OFF to exit the test.
(9) Emission Mode Switch / MODE Display:
Positioning this switch up or down when in NORM or PGM mode will
cycle the emission MODE display and the system between UV, LV,
LD, CW or AM emission mode.
(10) Channel Select Switches / CHAN Display:
Positioning these three switches up or down when in MAR, PRE or
PGM mode allows selection and display of all 176 ITU channels
when in MAR mode, and user-programmed channels when in PRE
and PGM modes. The selected channel will appear in the CHAN
display. The associated frequency and emission mode will appear in
their respective displays. The function of each of the three switches
is further explained as follows:
(a) The left channel select switch selects the maritime ITU most
significant digit (4 through 22).
(b) The center channel select switch selects the most significant
digit for user preset channel 10 through 19 and the 10s digit
(0 through 9) for maritime ITU channels.
(c) The right channel select switch selects the user preset
　
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