T-45A UJPT, E2-C2, ADV, & IUT Eng-21
CNI System
played on the frequency/channel
display
NOTE: Prior to running TEST,
select manual with frequency
selector knob.
(a) 888.888 indicates system
readiness
(b) Other number combinations
indicate system problem and
require service by mainte-
nance personnel
b.
Frequency selector (outer knob)
(1) 243: RT is automatically tuned to
243.0 MHz (UHF guard frequency)
and overrides mode control selec-
tor function, independent of which
cockpit currently has control. All
other control functions except
volume, brightness, and squelch
are disabled
(2) MAN: permits manual selection of
operating frequency using fre-
quency select switches; RT is
disabled during frequency change
(3) G: RT is tuned to guard frequency
in band in which set was last
tuned (243.0 MHz UHF or
121.5 MHz VHF)
(4) PRESET: enables selection of
any one of 30 preset channels
with channel selector (inner knob).
Selected channel displayed by two
center digital readouts on fre-
quency/channel display
Page 21-14
(8-03) Original
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