TM 1-1520-238-10
3-18
2. Select the desired manual frequency or preset
channel.
d. 1,020 Hz Tone Signal Transmission (MAIN) Pro-
cedures.
NOTE
The tone-modulated signal may be used to
check out the radio receiver.
1. Mode selector switch – MAIN.
2. Select a desired frequency for tone signal trans-
mission, either manually or with the preset chan-
nel selector.
3. TONE button – Press to transmit the 1,020 Hz
signal.
3.7.9 HQ Mode (RT-1167C Only) Operating Proce-
dures.
a. Activation of HQ Mode.
The HQ mode can be activated in one of two ways:
1. Function selector switch – MANUAL.
A-3-2-T switch – A.
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 chan-
nels, 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.
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. Preset channel selector – Next lower channel.
8. Repeat steps 4, 6, and 7 until all elements of the
WOD are loaded into preset memory.
9. 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 com-
mander or lead helicopter should emergen-
cy start his TOD clock. The lead helicopter
then will transfer this TOD to other helicop-
ters 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 PRE-
SET, 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.
