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SOFT KEY  FUNCTION
SETTING  Access Settings screen for radio that has been selected for edit.
3.6.2.2 Band Screen. The current operating band is shown in inverse video. When the pilot pushes a soft key for a new mode, that mode is selected, and the screen re-turns to either the COM summary screen or the Setting screen previously in use.
SOFT KEY  FUNCTION
sFM-SC  Selects FM single channel, returns to previous screen.
sCUE  Selects CUE frequency, returns to previous screen (preset marked to 0).
sSCAN  Selects FM-SC (Scan) mode, returns to previous screen.
FREQ-HOPg  Selects frequency hopping mode (FH), returns to previous screen.
FREQ-HOP Selects frequency hopping -master, MASTERg returns to previous screen.
CLD-STRTg  Selects frequency hopping -cold start, returns to previous screen.
RTNg  Returns to previous screen, without changing selected band.
3.6.2.3 Settings Screen. Setting screen allows setting of secondary radio controls, selection of a new preset, and gives access to frequency hopping set-up parameters.
SOFT KEY  FUNCTION
gPRESET  Selects number in scratchpad as frequency preset number.
gTUNE  Selects frequency .eld for editing.
gKY TEK  Selects .eld for edit.
gAMP PWR  Toggles radio transmit power outputs between BYPS, LOW, MID, HI (COM 1 only).
SOFT KEY  FUNCTION
sFH-SETUP  Toggles between the FH-SETUP Nand FHM-SETUP N (master and non-master) screens.
RCVRs  Toggles between TR (transmit/ receive) and HOM (COM 1 only).
BANDg  Access Band screen for this radio.
SQUELCHs  Toggles squelch ON or OFF.
3.6.2.4 Frequency Hop Setup.
SOFT KEY  FUNCTION
TIME-DT  Access FH-TIME/DATE-N screen.
STO  Stores hold memory contents into the selected Hopset or Lockout set as appropriate.
d (SK 3)  Toggle up through the radio stored frequency hopping .ll sets from 8 through 1. Hop net stays on 6 while lockout set is either 7 or 8.
f(SK 4)  Toggle down through the radio stored frequency hopping .ll sets from 1 through 8. Hop net stays on 6 while lockout set is either 7 or 8.
ERF-SND  Transmits ERF data from hold memory.
LDs  Loads hold memory contents with
HN  the selected Hopset. 
LDs  Loads  hold  memory  with  the 
LS  selected Lockout set. 

3.6.2.5 Time and Date Screen. Frequency Hopping time and date screen is for information only, giving the internal clock status for either COM 1 or COM 4.
3.6.3 Mode of Operation. The radio set can be used for these modes of operations:
a. Single Channel Mode. In the single channel mode, the radio operates on one selected frequency. The scan fea-ture for SINCGARS is dependent upon the scan channels that are selected from the SINCGARS band list. The se-lected channels are monitored. The radio will notify the pilot with a tone when there is activity on the scanned channel(s).
b.
Two-way secure voice utilizing embedded crypto.

c.
Frequency Hopping Mode. The radios in a SINC-GARS net simultaneously change frequencies up to 100 times per second in a pseudorandom fashion when trans-mitting and receiving which makes jamming and direction .nding difficult. All radios in a frequency hopping net need common hopsets, lockout sets, transmission security key (TSK), and TOD (internal clock). The hopset contains the group of frequencies to be used in a particular channel. Lockout sets de.ne the frequencies within the group that will not be used. The TSK determines the sequence of fre-quency hopping. The TOD synchronizes all the radios in the net. Hopsets are displayed in the H/NET column on the FH SETUP screen. There are 6 channels available for se-lection. Channel zero is not a full frequency hopping chan-nel (cold channel) but is used to receive the electronic re-mote hopset, and lockout set .ll. Each frequency hopping channel has its corresponding identi.er, displayed next to its number. The receiver/transmitter maintains the TOD via GPS and provides the synchronization for SINCGARS fre-quency hopping mode. To operate in a net, all of the radios must be synchronized in time to the master, which is refer-encing the receiver/transmitter internal clock. Time of day may not be in synchronization with nets having radios not connected to GPS. Modifying and reading the TOD is available through the FH-TIME/DATE screen. If the pilot has a hopset, net entry, and lockout but the receivers/ transmitters internal clock is less than or equal to 4 seconds off the master’s net time, the net master must key the net master radio which will send out a preamble to the net members which synchronizes their receivers/transmitters internal clocks to the net master. If the clock’s time is greater than 4 seconds but less than 1 minute off the net master’s time, the pilot can get back into the net via the late net entry (SYNCH) function. Initial setup of an operating communications net using SINCGARS requires a net mas-ter. Only one net master can selected. Difference in net master and non master is ERF send and synchronization. There are .ve functions to enter frequency hopping: cue operation, cold hop operation, hopset/lockout loading, purg-ing, and late net entry.
　
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