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-Automatic Direction Finder
RADIO INTERFACE UNIT (RIU)
The left and right Radio Interface Units are located on their respective equipment racks forward of the entry door.The RIUs accommodate data concentration, communications and audio management, and control functions. The RIU provides an in-terface between the radios and the rest of the aircraft systems and equipment. They receive inputs from TAWS and TCAS and distribute digital audio signals from the audio control panels (ACPs).
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
17-01-01 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.
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
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.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
17-01-02
RADIO TUNING AND OPERATION
MFD TUNING
The multifunction display (MFD) and display control panel (DCP) provide single point control of both the onside and cross-side radios from the pilot’s and copilot’s position. The radio menu provides a summary of the radios as well as control for each. The RADIO button on the DCP shows the radio menu on the MFD. The MFD sends signals to the aircraft radios to tune frequencies, set operating modes adjusts squelch levels, and selects voice/data modes. The MFD also responds to tune/control commands from the cross-side MFD or the control display unit (CDU). Either acts as the master tuning control.
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