T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
(b) Frequency selector (outer knob)
(i)
243: RT is automatically tuned to
243.0 MHz (UHF Guard
frequency) and overrides mode
control selector function, inde-
pendent of which cockpit currently
has control. All other control
functions except volume,
brightness, and squelch are
disabled
(ii) MAN: permits manual selection of
operating frequency using
frequency select switches; RT is
disabled during frequency change
(iii) G: RT is tuned to Guard
frequency in band in which set
was last tuned (243.0 MHz UHF or
121.5 MHz VHF)
(iv) PRESET: enables selection of
any one of 30 preset channels
with channel selector (inner knob).
Selected channel displayed by
two center digit readouts on
frequency/channel display
(v) READ: enables selection of any
one of 30 preset frequencies with
the channel selector (inner knob).
Displays frequency (rather than
channel number) of the preset
channel on frequency/channel
display
(vi) LOAD: automatically loads into
system memory manual frequency
displayed by selected preset
channel
(9-98) Original
Page 27-121
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