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MHz selector switches until desired frequency
is displayed in indicator windows.
To select a preset channel, rotate preset channel
selector until desired channel is displayed
in CHAN indicator window.
c. Transmit/Receive/Guard Monitor Operating
Procedures.
1. Mode selector switch - BOTH.
NOTE
If reception on the selected frequency interferes
with guard frequency reception,
detune the radio set by selecting an open
frequency or set function selector switch
to GUARD.
Change 2 3-17
TM1-1520-238-10
2. Select the desired manual frequency or preset
channel.
d. 1,020 Hz Tone Signal Transmission (MAIN) Procedures.
NOTE
The tone-modulated signal may be used to
check out the radio receiver.
1.
2.
3.
Mode selector switch - MAIN.
Select a desired frequency for tone signal
transmission, either manually or
preset channel selector.
TONE button - Press to transmit
Hz signal.
with the
the 1,020
3.7.9 HQ Mode (RT-1167C Only) Operating Procedures.
a. Activation of HQ Mode.
The HQ mode can be activated in
1. Function selector switch
A-3-2-T switch - A.
one of two ways:
- MANUAL.
2. Function selector switch - PRESET. Preset
channel selector - Channel 20.
b. Entering the WOD.
NOTE
The WOD is normally entered before
flight but can be entered in flight.
1. Mode selector switch - MAIN.
2. Function selector switch - PRESET.
NOTE
Channels containing WOD elements cannot
be used in the normal preset function.
Transmission can be made on WOD channels,
but they will not be on the frequency
stored in the channel memory.
3. Preset channel selector - Channel 20.
4. Frequency selector 1- Set first WOD element.
5. Open switching unit cover.
3-18
6. PRESET button - Press.
NOTE
The WOD elements are entered into
memory through channels 20 through 15.
The WOD varies in length and will require
from one to six of these channels.
7.
8.
9.
Preset channel selector - Next lower channel.
Repeat steps 4, 6, and 7 until all elements of
the WOD are loaded into preset memory.
Close and latch the switching unit cover.
NOTE
A single beep indicates that the WOD in
channel 20 was entered into preset
memory and that an additional WOD element
is in the next lowest preset channel.
10. Preset channel selector - Set to channel 20. A
single beep is heard.
NOTE
The double beep heard at the last channel
signifies that the WOD elements have
been transferred to volatile memory.
11. Preset channel selector - Set to progressively
lower channels. A single beep is heard at each
channel until the last channel; a double beep
is heard at the last channel.
3.7.10 HQ Emergency Startup of TOD clock.
NOTE
This method of providing TOD is used
when there is no TOD available from
another HQ radio or external source.
When using this method of synchronization,
the flight commander or lead helicopter
should emergency start his TOD clock.
The lead helicopter then will transfer this
TOD to other helicopters in flight. A valid
TOD signal must be used by all helicopters
before effective AJ communications
can be achieved.
1. Function selector switch - MANUAL or PRESET,
as desired.
NOTE
To preclude an inadvertent transmission
of a new time, release the TONE button
prior to releasing the A-3-2-T switch.
2. A-3-2-T switch - T and hold.
TM 1-1520-238-10
3. TONE button - Press momentarily.
4. A-3-2-T switch - Release.
5. Return to designated frequency or
channel.
a. Transmitting TOD from Net Control Helicopter.
NOTE
TOD transmission and reception is
normally performed before flight, but it
can be performed in flight.
1. Mode selector switch - MAIN or BOTH, as
desired.
2. Function selector switch - MANUAL or
PRE- SET as desired.
3. Frequency selectors - Select
predesignated frequency.
or
Preset channel selector - Set to
predesignated channel.
4. Call other helicopter(s) to send time.
5. TONE button - Press momentarily to send
TOD. Listen for 1,020 Hz tone.
b. Receiving TOD.
NOTE
*. After power-up and WOD transfer, the radio
automatically accepts the first TOD
message received.
· To receive TOD in normal mode, after setting A-
3-2-T switch to T, set the radio to the frequency
being used.
1. Mode selector switch - MAIN.
2. Function selector switch - MANUAL or
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