T-45A UJPT, E2-C2, ADV, & IUT Eng-21
CNI System
(1) UHF frequency range: 225.0 to
Sg 2, fr 7
399.975 MHz; commonly used in
military aviation for communica-
tions
(2) VHF frequency range: 30.0 to
173.975 MHz; commonly used in
civil aviation for communications
and navigation
FREQUENCY BANDS
c.
Enables preset of up to 30 operating
frequencies, which allows for ease of
frequency selection while flying
formation or other demanding
maneuvers
NOTE: The LED readouts in both
cockpits will display the frequency or
channel selected by the cockpit that
has control.
2.
UHF/VHF functionality
Sg 2, fr 8
a.
MODE control selector
(1) OFF: power is removed from the
set
(2) T/R: set is energized to receive
and transmit on selected channel
or frequency (requires no warm
UHF/VHF CONTROL PANEL
up)
(3) T/R & G: same as for T/R position
except guard receiver is energized
to receive on guard frequency
applicable to frequency band
selected on main receiver
(4) DF: not functional
(5) TEST: initiates built-in test (BIT)
for the RT. Test results are dis-
(8-03) Original
Page 21-13
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