T-45A UJPT, E2-C2, ADV, & IUT Eng-26
Engineering Review
(a) OFF: power is removed from
set
(b) T/R: set is energized to
transmit/receive on selected
channel or frequency
(c) T/R & G: enables transmitter,
main receiver, and guard
receivers
(d) DF: not functional in T-45A
(e) TEST button: initiates built-in
test (BIT)
(2) Frequency selector (outer knob)
(a) 243: tunes receiver and
transmitter to UHF (Guard)
emergency frequency
243.0 MHz, and overrides
mode control selector
function, regardless of which
cockpit is in control
(b) MAN: permits manual
selection of operating
frequency using frequency
select switches
(c) Guard (G): sets RT to guard
frequency in band to which
RT last tuned (121.5 VHF or
243.0 UHF)
(d) PRESET enables selection of
any of 30 preset operating
frequencies
(3) Frequency select switches: manu-
ally select frequencies when fre-
quency selector in MAN position
Page 26-81
(8-03) Original
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