CHAPTER 1. AP-4000
1.1. RADIO NAVIGATION RECEIVERS
1.1.1 COM/NAV
On the "COM1/NAV1", "COM2/NAV2", and the "ADF" receivers, the displays on the right hand side show
the standby, the left displays show the active frequency. Setting a frequency is done in the same way as on
a real receiver. Use the inner/outer rotary to count up or down the standby frequency, or, if operating the
device with the mouse, click on the numbers themselves (Clicking on the right side of the number decreases
and clicking on the left side increases the value). Pushing the double-arrow button will toggle ("ip-op")
the frequencies. Each receiver may be switched on and o individually by turning (or dragging, if operated
with the mouse) the On/O button.
Figure 1.2: COM/NAV Module
The identication code of the currently selected "NAV" station will be audible over the connected speak-
ers, when the Ident button is pressed and the corresponding switch on the audio panel is on. When the
RAD button (Radial) on the NAV1 or NAV2 receiver is activated, the actual radial from the VOR station
is displayed in place of the standby frequency. While in the radial mode turning the knobs directly sets the
active frequency. There is no radial available when an ILS frequency is tuned.
1.1.2 DME Receiver
Figure 1.3: DME Receiver
The LED brightness can be adjusted by turning the DIM/BRT knob. The DME device has three dierent
operation modes, RMT, FREQ and GS/T.
RMT Mode
Distance, Ground Speed and TTS of remote frequency are displayed.
By activating the R1 or R2 button, the corresponding frequency is automatically taken from the NAV1 or
the NAV2 receiver. Search time is about one second. When no ground station can be locked, dashes will
be displayed. Distance, Ground Speed and TTS are only available if the station remotely tuned is DME
equipped.
Frequency Mode
Distance and selected frequency are displayed.
The DME receiver is in the frequency mode by default. It is then channelled internally with its own two
concentric frequency selection knobs (rotary dials) which set the active frequency. If a tuned station is DME
equipped, the relative distance to the station is indicated.
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