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 B.  Two ADF systems are installed in the airplane. Each system consists of a receiver, sense antenna, sense antenna coupler, fixed loop antenna, quadrantal error corrector and control panel. Location of the components is shown in Fig. 1.
 C.  Both ADF systems are controlled by a common dual-system control panel. Operation and mode selection of each ADF receiver is remotely controlled from its half of the dual control panel on the flight deck. The receiver uses signals from both the sense and the fixed loop antennas to compute the compass bearing to the radio station.
 D.  The ADF system interfaces with two RDDMI's (radio digital distance magnetic indicators) and the flight interphone system. The RDDMI's display the compass bearing to the radio station. The flight interphone system provides switching and audio monitoring equipment to handle the audio output from the automatic direction finder receiver. The ADF system also interfaces with two EFSG's (EFIS symbol generators). When selected, the EHSI's display the compass bearing to the radio station.
 E.  The ADF systems obtain 28 volt dc and 115 volt ac power from circuit breakers on load control centers P18 and P6. ADF No. 1 system power is from the standby bus on load control center P18 and ADF No. 2 system power is from ELEX bus 2 on load control center P6.
 2.  Loop Antenna____________
 A.  The fixed loop antenna is a sealed, nonrotating, direction-sensitive rf pick-up device for the automatic direction finder system receiver. The antenna consists of two pairs of ferrite core coils, one pair oriented parallel to and the second pair oriented perpendicular to the fore and aft axis of the airplane. Both coil pairs are coupled to the system receiver through the quadrantal error corrector and loop antenna transmission cable.
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A 737-300/400/500MAINTENANCE MANUAL

ADF CONTROL PANEL ADF RECEIVER NO. 1 AND NO. 2
C

D

ADF System Component Location
Figure 1 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL

 

ADF SENSE ANTENNA AND COUPLER
(EXAMPLE)

 

ADF System Component Location
Figure 1 (Sheet 2)

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A 737-300/400/500MAINTENANCE MANUAL
LOOP ANTENNA
TRANSMISSION

 

ANTENNA MOUNTING SCREWS (8 LOCATIONS)

ADF LOOP ANTENNA AND QUADRANTAL ERROR CONNECTOR (EXAMPLE)

ADF System Component Location
Figure 1 (Sheet 3)

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A 737-300/400/500MAINTENANCE MANUAL

ANTENNA-2
ADF System Block Diagram Figure 2
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A 737-300/400/500MAINTENANCE MANUAL
34-21-00
1
"A"

GG C
LOOP

　
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