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TM 11-5821-333-12
4-5.
e.
f.
g.
h.
4-6.
SC FREQUENCY SCANNING. Continued
Restoring a Cancelled Preset.
Press number for the cancelled preset. The display will shows “CH” and preset number. The preset is
now back in the scanning sequence.
Starting Scanning While Locked on a Preset.
Press STO (Sto/ENT) button on radio set.
Checking Frequency of Locked-in Preset.
Press FREQ pushbutton on radio set while channel number is in display. The display changes to show
frequency.
Stopping Scanning.
Set radio set PRESET switch to a different position.
HOMING MODE.
In this mode, the radio set can receive a homing signal from a ground or airborne station. When the MODE switch
is set to HOM, the RT is automatically placed in SC mode, the communications antenna is disconnected, and the
left and right homing antennas are connected. The operating frequency is still selected by the PRESET switch.
Both the homing radio set and the set on which the homing is being done must be set to the same frequency.
When a homing signal is received, the homing instruments in the cockpit give the pilot steering, station ap-
proach, and signal strength information. The RT can still transmit on the SC frequency being used while in the
homing mode. When the transmitter is keyed, the RT automatically switches to the communications antenna,
and steering information to the homing instruments is disabled. When transmission is completed, the radio set
returns to the homing mode. Once a homing operation has been completed, the radio may be returned to fre-
quency hopping mode by switching from HOM to FH.
Section Il. OPERATION UNDER UNUSUAL Conditions
Subject
Para
Page
Cold Weather Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4-4
Exposure to Nuclear Radiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
4-4
4-7. COLD WEATHER OPERATION.
The RT operates normally at temperatures to -65°F (-54oC), but batteries lose their power when they get cold. If
you have SC or FH presets in the RT, do not set FUNCTION to OFF if the temperature drops below +20°F. You may
cause the presets to be cleared by shutting off RT power.
4-8. EXPOSURE TO NUCLEAR RADIATION.
If another station or aircraft cannot be contacted after a nuclear event, perform the following. If communications
still cannot be established, get maintenance to check the radio.
a. Reset Radio
(1). Set radio FUNCTION switch to OFF.
(2). Set radio FUNCTION switch to SQ ON.
b. Test Radio
(1). Set radio FUNCTION switch to TEST.
(2). Check radio display for proper indications.
4-4
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