VHF NAVIGATION SYSTEM
DESCRIPTION
The standard VHF navigation system includes dual VOR/localizer receivers, dual glideslope receivers, dual marker bea-
cons, single distance measuring receiver (DME), and single automatic direction finder receiver (ADF). A second ADF and
a second DME are available as options.
COMPONENTS AND OPERATION
INTEGRATED NAVIGATION RECEIVERS
The basic aircraft is equipped with a NAV-4000 receiver and a NAV-4500 receiver. Aircraft equipped with dual ADFs have
two NAV-4000 receivers.
The NAV-4000 receiver is a remote mounted VOR/LOC receiver, glide slope receiver, marker beacon receiver, and ADF
receiver in a single unit. The NAV-4500 contains all the features of the NAV-4000 except the ADF module.
Included in the NAV receiver module is the single-channel marker receiver, which operates at a fixed frequency of 75 MHz
and has a HI/LO sensitivity control. This marker receiver provides audio and visual marker information for cockpit indi-
cations.
The ADF receiver operates in the frequency range of 190 to 1799 kHz and the maritime distress bands of 2088-2094 kHz
and 2179-2185 kHz. It can operate as an AM radio receiver and automatic direction finder, with the capability of receiving
keyed carrier stations via a beat frequency oscillator (BFO) signal.
VHF NAVIGATION RECEIVERS
Two VHF navigation receivers (NAV 1 and NAV 2) provide VHF omnirange (VOR), localizer (LOC), glideslope (GS) and
marker beacon (MKR) signals to the navigation systems and flight crew.
Frequency selection is accomplished through the display control panel (DCP) or the control display unit (CDU).
MARKER BEACONS
Marker beacons indications are presented on the PFDs and audibly in the speakers and headsets if selected on during station
passing. Two marker beacon antennas are installed on the bottom of the fuselage.
System
Frequency Range
Channel Spacing
VOR
108.00 to 117.9 MHz
50 kHz (160 chan)
LOC
108.10 to 111.95 MHz
50 kHz (40 chan)
GS
329.15 to 335.00 MHz
150 kHz (40 chan)
MKR
75.00 MHz
Preset
Challenger Global 300 - Navigation
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