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control knob indicator.
CW, VOICE, TEST
switch
CW (in the Enables the tone oscillator to provide an audible tone for tuning to a (CW) station when
COMP mode) the mode selector switch is at COMP.
CW (ANT or Enables the beat frequency oscillator to permit tuning to a CW station when the mode
LOOP mode) selector switch is at ANT or LOOP.
VOICE Permits (LF) receiver to operate as a receiver when the mode selector switch is at any
position.
TEST (in the Provides for slewing of the loop through 180 degrees to check operation of the receiver in
COMP mode) the COMP mode. This switch position is inoperative in LOOP and ANT modes.
TUNE meter Indicates relative signal strength while tuning the set to a specific radio signal.
KILOCYCLES Indicates operating frequency to which receiver is tuned.
indicator
3.12.3 Operating Procedures.
a. Starting Procedure.
1. Mode selector switch - COMP, ANT or
LOOP.
2. Frequency - Select.
3. CW-VOICE-TEST switch - CW or VOICE
as desired.
4. CSC panel NAV A receiver select switch
ON.
5. Fine tune control - Adjust for maximum
upward indication on the TUNE meter.
6. AUDIO control - Adjust as desired.
b. COMP Mode Operation.
1. Mode selector switch - COMP. The
horizontal situation indicator No. 2 bearing
pointer and the radio magnetic indicator
bearing pointer will display the magnetic
bearing to the ground station from the
helicopter as read against the integral
compass card on each instrument.
Change 3 3-31
TM 1-1520-238-10
3-32 Change 6
2. Test the ADF as follows:
a. CW-VOICE-TEST switch -- Set to TEST
position. Check that both bearing pointers
associated with the ADF rotate approximately
180°.
b. CW-VOICE-TEST switch -- Release.
c. ANT Mode Operation.
1. Mode selector switch -- ANT
2. Monitor receiver in headset.
d. LOOP Mode Operation (manual direction finding).
1. Mode Selector switch -- LOOP.
2. Turn the LOOP L-R control to L (left) or R
(right) to obtain an audio null and a TUNE indicator
null. Check either ADF bearing pointer
for a display of magnetic bearing to or from
the station. The two null positions may be as
much as 180° apart in this mode.
NOTE
During an electrical system malfunction
and operating on EMERG BATT power,
the HSI/RMI will not provide adequate indications
to the station.
3.13 AUTOMATIC DIRECTION FINDER SET
AN/ARN-149(V)3.
ADF set AN/ARN-149 is an airborne, LF, ADF radio
that provides an automatic compass bearing on any radio
signal within the frequency range of 100 to 2199.5
kHz. The ADF displays helicopter bearing relative to a
selected radio transmission. On the pilot instrument
panel, it is shown by the horizontal situation indicator
(HSI) No. 2 bearing pointer (fig 2-9). On the CPG panel,
it is shown on the RMI bearing pointer (fig 2-10). The
ADF operates in the ANT (audio only) and ADF modes.
It also has a self test mode. In addition, a submode provides
the capability of identifying keyed CW signals.
The ADF receives 28 VDC from the emergency DC bus
through the ADF circuit breaker on the pilot overhead
circuit breaker panel. TheHARS AC circuit breaker on
the pilot overhead circuit breaker panel provides power
for the 26 VAC reference voltage used by the ADF receiver.
3.13.1 Antenna. The ADF antenna (fig 3-1) is located
on the bottom center of the fuselage under the Doppler/
Radar Altimeter (DRA) fairing.
3.13.2 Controls and Functions. Controls for the AN/
ARN-149 are on the front panel of the ADF control panel
(fig 3-9) located on the pilot right console. The function
of each control is described in table 3-10.
M01--291
VOL
A
D
F
MAN--2182--500
SWITCH
TAKE
CMD ADF
OFF
ANT
TONE
MAN
500
2182
TEST
TEST--TONE
SWITCH
TAKE CMD
SWITCH
VOL CONTROL MODE SELECTOR
SWITCH
FREQUENCY
SWITCHES AND
INDICATORS
Figure 3-9. AN/ARN-149(V)3 ADF Control Panel
TM 1-1520-238-10
Table 3-10. AN/ARN-149(V)3 ADF Control Panel Control Functions
Control
Mode selector
switch
Function
OFF Removes power from the ADF.
ANT Provides for operation as an AM receiver.
ADF Provides both ADF and AM receiver operations.
TARE CMD switch Not used.
VOL control Controls the audio volume in 12 discrete steps.
TEST-TONE switch Selects the submode of operation. If TEST is selected, the HSI No. 2 bearing pointer and
RMI pointer momentarily move 90 degrees as a self-test. If TONE is selected, the normal
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