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heard after each entry thru 15, where a • If digital data is to be transmitted in the
double beep will denote a complete WOD AJ mode, 00 or 25 speed is to be selected
acceptance. The cursor will move to the with the bandwidth in narrow.
DATE line with the next consecutive date
displayed. If the date displayed is acceptable,
pressing the MFK ENTER key will move the 13. AJ/NORM  Press. Select AJ boxed. DATE
cursor to the WOD line and the process is followed by a cursor will appear. Enter the
repeated with the new WOD until all WODs date desired and press the MFK ENTER key.
are entered. RFD UHF will display AJ with the NET
3-17
TM 1-1520-248-10
number. The DATE function is not available NOTE
with basic HQ.
NOTE • While an EGI TOD transfer is in progress,
the TOD sync function and the AJ/Normal
mode control are disabled. Both functions
• A s o l i d t o n e i n d i c a t e s t i m e are restored to normal operation when the
synchronization was not accomplished or EGI TOD transfer is completed.
volatile memory not loaded; cycling tone
indicates not in AJ mode or lack of 0’s in • The EGI TOD transfer function is disabled
tens and ones. if the EGI time is invalid or inaccurate.
• A short, high-pitched tone followed by a • The EGI TOD transfer function is disabled
low-pitched tone indicates the presence of if EGI is a NOGO or AJ mode is active.
TOD.
3-13. EMERGENCY START-UP OF TOD 3-15. TOD RECEPTION NORM MODE.
CLOCK (SELF-GENERATED TOD).
1. AJ/NORM key  Press. Select NORM boxed.
NOTE
2. RFD UHF frequency  Display frequency
WOD must be loaded prior to emergency TOD is being transmitted on.
start of TOD clock. Self-generated TOD
limits users to communications in AJ mode
among individuals who received their TOD 3. TOD SYNC key  Press. A dual tone (1167
from the self-generated unit. Hz changing to 1020 Hz) will be heard upon
receipt of TOD.
1. Load WOD.
2. On MFD with UHF Radio Control page
displayed (fig. 3-6) TOD CONTROL key 
Press. SELF TOD key (fig. 3-9)  Press.
3. Press XMIT TONE key  Dual frequency
should be heard in headset.
NOTE
No tones will be heard when the TOD is
generated. To preclude an inadvertent
transmission of this new time, release the
TONE key prior to releasing the TOD SYNC
key. Transmit this TOD signal to any other
radio requiring mutual communications in
the AJ mode.
3-14. EGI TOD TRANSFER.
On the UHF Radio Control page (fig. 3-9), R-4 initiates
the transfer of Precision Time/Time Increment data
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
EMER T/R
KYBD
12 241.075
FC10
UHF
T/R + G
DATE
WOD
NET
DIPH WIDE
TOD SYNC AJ NORM
406075-1413-4
J0546
SELF TOD
EGI SYNC
ON SQL
from the EGI to the UHF HAVE QUICK radio. The
transfer requires approximately 3 seconds to complete Figure 3-9. UHF Radio Control Page  HQ
and is indicated by the legend EGI SYNC being boxed.
3-18
TM 1-1520-248-10
3-16. AN/ARC-201 SINCGARS VHF-FM 3. R-5  Press to select FM-1 or FM-2 Radio
RADIO. Control page (fig. 3-10).
The AN/ARC-201 Single Channel Ground and Airborne 4. SC/FH key  Press to select single channel
Radio System (SINCGARS) provides single channel  SC.
and frequency hopping in the VHF/FM band 30.000 to
87.975 MHz in 0.025 MHz intervals. The AN/ARC-201 5. EMER T/R key  Toggles between current
is a remote controlled receiver-transmitter (RT) used in frequency and emergency frequency 40.50.
MIL-STD-1553B data bus aircraft. The RT is controlled
by the aircraft control and display system (CDS). 6. PWR key  Press to select IFM power level:
Provisions for two radios (FM-1 and FM-2) are provided NORM, LO, MED, HI.
in the aft electrical compartment. The single channel
mode provides normal VHF/FM operation for voice, NOTE
digital and secure communication in conjunction with
KY-58 VINSON equipment. FH mode is used to counter The IFM HI power setting cannot be
enemy jamming and directional finding equipment selected until enabled from the Ground Set-
through a Data Rate Adapter (CD-3885/ARC-201(V)). Up page.
Operation of the data rate adapter is automatic with no
operator interface. The SINCGARS radios are powered 7. KYBD key  Press to activate MFK for
by the 28 Vdc essential bus and circuit protection is entering radio channels from frequency list or
provided by the FM-1 and FM-2 circuit breakers. manual frequencies.
　
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