3.14.3 Operation.
3.14.3.1 Normal Operation.
1. On CSC panel, NAV A monitor control -Press on, and adjust as desired.
2.
On  NAV SELECT control screen, frequency or preset -Select.

3.  
NAV VOL control -Adjust.

4.  
VTAC switch -VOR/ILS.

5.  
MODE SEL VOR/ILS switch -VOR.

6.  
CIS MODE SEL NAV/ON switch -As de-sired.

3.14.3.2 VOR/Marker Beacon Test. NOTE Test will not be valid if signal reception is invalid.
1.
HSI CRS control (pilot and copilot) -Set 315° in course display.

2.
Access  NAV TESTS page by pressingTST .xed function key, then NAV soft key. To start test, VOR/ILS soft keys -Press, until TEST under VOR/ILS is displayed in inverse video.

3.
All indications next to PRI FAULT and SEC FAULT under TEST should read PASS.

4.
HSI VOR/LOC course arrow and VSI course deviator pointer -Centered (61 dot).

5.
No. 2 bearing pointer -315° (65°).

6.
To-from arrow -TO.

7.
On NAV TESTS screen, RTN soft key -Press.

3.14.3.3 VOR Operation. HSI CRS control -Course se-lect.
3.14.3.4 ILS (LOC/GS) Operation.
1.
ILS frequency or preset -Select.

2.
On CSC panel, NAV A control -Press on, and adjust volume as desired.

3.  
CIS MODE SEL NAV/ON switch -As de-sired.

3.14.3.5 Marker Beacon (MB) Operation.
1. On RADIO NAV screen, MB SENSE soft key -Press, until HI/LO is as desired.
2. On CSC panel, NAV A control -Press on, and adjust volume as desired.

3.14.3.6 VOR Communications Receiving Opera-tion.
1.
Frequency or preset -Select.

2.
On CSC panel, NAV A control -Press on, and adjust volume as desired.

3.15 DIRECTION FINDER SET AN/ARN -149 (LF/ ADF).
The AN/ARN -149 (Figure 3-24) is a low frequency (LF), automatic direction .nder (ADF) radio, providing compass bearing capability within the frequency range of 100 to 2199.5 kHz. The ADF has two functional modes of operation: ANT and ADF. The antenna (ANT) mode func-tions as an aural receiver, providing only an aural output of the received signal. The ADF mode functions as an auto-matic direction .nder, providing a relative bearing-to-station signal to the horizontal situation indicator No. 2 bearing pointer and an aural output. A TONE submode of operation can be selected in either ANT or ADF mode, providing a 1000-Hz aural output to identify keyed unmodulated carrier wave (CW) signals. Power is provided to the LF/ADF system by the No. 1 dc primary bus through a circuit breaker labeled ADF and the ac essential bus through a circuit breaker, labeled 26 VAC INST.
3.15.1 Antennas. The antenna system is a single com-bination antenna containing both loop and sense elements. The RF signal from one loop element is modulated with a reference sine signal while the other loop element is modu-lated with a reference cosine signal. The two modulated signals are combined, phase shifted 90°, and ampli.ed. The resulting loop signal is summed with the sense antenna sig-nal and sent to the ADF radio for visual and aural execu-tion. The antenna con.guration is .ush mounted under the bottom cabin fuselage (Figure 3-1).
3.15.2 Controls and Functions. The ADF is con-trolled by the AMS with CDU control screens (Figure 3-24). Operator functions are to choose frequency and mode of reception. A complete list of presets is displayed on RADIO NAV REVIEW screen, accessed through the QUICK REVIEW soft key on the MISSION DATA screen (Figure 3-24). The function of each control screen is given below.
3.15.2.1 Nav Select Screen. The primary control screen is NAV SELECT, accessed by pressing NAV .xed function key (Figure 3-24). Displays on the screen and ac-
　
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