OPERATIONS MANUAL

Communications
RTP: (continued)
HF sensitivity control
Rotate Sets sensitivity of selected
HF receiver. Control is
operative also when RTP
is switched off.
AM switch
Push (momentary action) Alternately
switches between upper side band
(USB) and amplitude modulation
(AM) for the selected HF radio.
AM is in use.
WHITE
LIGHT
Radio selection switch
(VHF L, C, R; HF L, R)
Push (momentary action)
Selects radio for tuning.
WHITE
LIGHT
Radio is selected.
For Engineers
Lockout feature
Authorized engineers may set certain
radio controls inoperative on all RTPs.
For example, when the left HF radio is
removed from the aircraft, the RTPs may
be programmed so that the frequency
indicators display INOP when HF L is
selected. To program this, depower, for
instance, RTP L (pull the VHF L circuit
breaker), then, while holding the frequency
transfer switch and the HF L radio selection
switch on RTP L simultaneously, repower
RTP L, then release the switches. The same
procedure will remove this feature.
(In the simulator, one mouse can hold only
one switch at a time; therefore, the simulator
will keep the switches pressed for 5 seconds
on an unpowered RTP, allowing the mouse
user to click on all required switches.)
Memory logic
Each RTP stores the active and the standby
frequency data for all communication
radios, including HF sensitivities and HF
modulation methods. Data changed on
one RTP is automatically copied to the
other RTPs if they are active. When an
inactive RTP is reactivated while another
RTP is already active, the already active
RTP will copy its data to the reactivated
RTP. When all RTPs are inactive, the first
reactivated RTP will provide the initial
dataset. Inactive, in this context, means: the
RTP is disconnected by the OFF switch or is
depowered entirely.—When RTP control is
unavailable, all radios remain operative and
tuned to the last set frequency.
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