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CONTROL/ FUNCTION INDICATOR
DELTAS  Title of screen.
DOPP  Marks position differences between the MARK input and Doppler position in nautical miles.
ACCs  Updates the Doppler’s position.
RTNg  Access FIX MENU screen.
3.14 RADIO RECEIVING SET AN/ARN-147(V)(VOR/ ILS/MB).
Radio set AN/ARN-147(V) (Figure 3-23) is a very high frequency receiver, capable of operating from 108.0 to
126.95 MHz. Course information is presented by the verti-cal situation indicator deviation pointer and the selectable No. 2 bearing pointer on the horizontal situation indicator. The combination of the glide slope and localizer capabili-ties makes up the instrument landing system (ILS). The marker beacon portion of the receiver visually indicates on the vertical situation indicator MB advisory light, and au-rally signals over the headphones helicopter passage over a transmitting marker beacon. The radio set may be used as a VHF omnirange (VOR) or ILS receiver. The desired type of operation is selected by tuning the receiving set to the frequency corresponding to that operation. ILS operation is selected by tuning to the odd tenth MHz frequencies from
108.0 to 111.95 MHz. VOR operation is selected by tuning from 108.0 to 126.95 MHz, except the odd tenth MHz from
108.0 to 111.95 MHz reserved for ILS operation. The three receiver sections do the intended functions independent of each other. Performance degradation within any one of the major sections will not affect performance of the others. Power for the AN/ARN-147 is provided from the dc essen-tial bus through a circuit breaker, labeled VOR/ILS.
NOTE
Tuning to a localizer frequency will auto-
matically tune to a glide slope frequency
when available.

3.14.1 Antennas. The VOR/LOC antenna system (Fig-
ure 3-1) consists of two blade type collector elements, one on each side of the fuselage tail cone. The glide slope an-tenna is mounted under the avionics compartment in the nose. The antenna provides the glide slope receiver with a matched forward looking receiving antenna. The marker beacon antenna is .ush-mounted under the center section of the fuselage.
3.14.2 Controls and Functions. The VOR/ILS/MB receiver is controlled by Avionics Management System (AMS). Operator functions are to choose frequency and sensitivity of marker beacon 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 3-23)
3.14.2.1 NAV SELECT Screen. The primary control screen is NAV SELECT, accessed by pressing NAV .xed function key (Figure 3-23). Displays on the screen and ac-
tive soft keys for VOR/ILS/MB are as follows:
CONTROL  FUNCTION
NAV SELECT
screen
gVOR soft key  Toggles between VOR preset channel and frequency for edit.
TM 1-1520-253-10

SA

CONTROL  FUNCTION
sSETTINGS  Accesses RADIO -NAV screen.
3.14.2.2 RADIO -NAV Screen. The RADIO -NAV screen is accessed by SETTINGS soft key on the NAV SELECT screen. Current settings of the AN/ARN-147 are displayed as follows:
CONTROL  FUNCTION
RADIO -NAV  Title of screen.
VOR/ILS/MB  Display O, I,or M if Outer, Inner, or Middle marker is detected.
BRG  Displays bearing set on HSI.
gMB -SENS  Toggles between HI and LO sensitivity. Selected sensitivity is displayed in inverse video.
3.14.2.3 VOR/ILS Preset Screen. See Figure 3-23 to access the VOR/ILS preset screen. Use this screen to edit or establish a preset. Displays on the screen and active soft keys are as follows:
CONTROL  FUNCTION
VOR/ILS PRESET  Title of screen.
gPRESET  Edit the preset number.
gNAME  Edit the preset name.
gTUNE  Edit the preset frequency.
SENSs Toggles marker beacon receiver HI/LO between high and low sensitiviy.
　
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