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border. The AM/FM option is always border highlighted and toggles between AM and FM. If the
current frequency is available only in AM or FM, the AM/FM option is not displayed. While in the
UHF AM mode, the cipher option cycles as follows: CPHR (no highlighted border-cipher disabled),
CPHR (border highlighted-cipher baseband enabled), CPDP (border highlighted-cipher diphase
enabled). The CPHR and CPDP options are mutually exclusive. Continued selection of this option
repeats the above cycle. CPHR (both diphase and baseband) or ADF operation is available for only one
radio at a time. Enabling CPHR or ADF on COMM 1 automatically disables CPHR or ADF on COMM
2 if previously enabled.
Enabling ADF automatically disables SQCH. SQCH may be enabled after selecting ADF by
touching the SQCH option. However, if SQCH was not enabled after selecting ADF it is automatically
enabled when ADF is disabled.
The AJ option is not available on this sublevel.
23.2.2.6 COMM Sublevel - Presets 1 Thru 20 (Fixed Frequency). The Preset 1 Thru 20 COMM
Sublevel is selected by touching the COMM 1 touch option/display with CH (1 thru 20) previously
selected (see figure 23-5). This sublevel is used to change the frequency, to enable or disable squelch,
cipher mode, guard receive, ADF operation, to select modulation type (AM or FM), to enter anti-jam
mode or to access Have Quick, Have Quick time, SINCGARS coldstart, Have Quick manual data fill,
or SINCGARS zeroize. Selecting this sublevel displays a 1: (selected radio) followed by the current
Figure 23-4. COMM Sublevel - Manual Preset
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VII-23-10 ORIGINAL
channel number and fixed frequency. The fixed frequency for any channel number (1 thru 20) is
changed by touching the desired numbers on the keypad options, verifying the new frequency number
in the scratchpad, and touching ENT.
1. 30 thru 87.995 MHz (FM) - at increments of .005 MHz,
2. 108 thru 135.995 MHz (AM) - at increments of .005 MHz,
3. 136 thru 155.995 MHz (AM/FM) - at increments of .005 MHz,
4. 156 thru 173.995 MHz (FM) - at increments of .005 MHz,
5. 225 thru 399.975 MHz (AM/FM) - at increments of .025 MHz.
If an invalid number is entered, ERROR is displayed in the scratchpad. SQCH (squelch), GRCV
(guard receive), and ADF (automatic direction finder) are enabled or disabled by touching the
respective touch options/displays. An enabled option has a highlighted border. While in the UHF AM
mode, the cipher option cycles as follows: CPHR (no highlighted border-cipher disabled), CPHR
(border highlighted-cipher baseband enabled), CPDP (border highlighted-cipher diphase enabled).
The CPHR and CPDP options are mutually exclusive. Continued selection of this option repeats the
above cycle. CPHR (both diphase and baseband) or ADF operation is available for only one radio at
a time. Enabling CPHR or ADF on COMM 1 automatically disables CPHR or ADF on COMM 2 if it
was previously enabled.
Enabling ADF automatically disables SQCH. SQCH may be enabled after selecting ADF by
touching the SQCH option; however, if SQCH was not enabled after selecting ADF it is automatically
enabled when ADF is disabled.
Selecting the AJ option on this sublevel selects COMM 1 anti-jam mode. If Have Quick is
pre-defined for the current preset, the radio enters Have Quick mode. If SINCGARS is pre-defined for
the current preset, the radio enters SINCGARS. If no data/waveform or time is stored in the radio for
the current preset, NO FILL is displayed in the scratchpad and the radio is in neither Have Quick or
Figure 23-5. COMM Sublevel - Presets 1 Thru 20 (Fixed Frequency)
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VII-23-11 ORIGINAL
SINCGARS. For Have Quick or SINCGARS data entry, see Have Quick or SINCGARS System
paragraphs, this chapter. Once the radio is in the anti-jam mode it remains in the anti-jam mode, even
if the preset channel is changed using the COMM channel select knob or the Top Level CNI Format
Channel Change paragraph procedure (fast data entry). The anti-jam mode is disabled by touching the
border highlighted AJ touch option/display.
23.2.3 ANTI-JAM OPERATION. There is no AJ or AJ MENU option on the Ship Maritime Preset,
Guard Preset, or Cue Preset Sublevels. The Manual Preset Sublevel has an AJ MENU option but does
not have an AJ option. Anti-Jam operation is described in the Have Quick and SINCGARS System
paragraphs, this chapter.
23.2.3.1 AJ MENU From Fixed Frequency COMM Sublevel. Touching the AJ MENU touch
option/display while on the COMM sublevel with a fixed frequency selects the AJ MENU From Fixed
Frequency COMM Sublevel (see figure 23-6). This sublevel initializes with no options selected and
displays a 1: (selected radio) in the scratchpad but does not display the fixed frequency. The AJ fixed
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NATOPS Flight Manual 飞行手册 2(77)
