12
 RBL 45) (STA 727 RBL 45)

(STA 727

28SAME AS N7TEST
ADF TEST ACTUATE 29
F/O RDDMISWITCH
13261
N6 CAPTAIN'S RDDMI (P1)S1
D2433DJ14ADF-2 OND2433E
DC POWER
F14ZM29SUPPLY
28V DCE14YADF-2 BRG
C61
ADF-2

D14XADF 2 DC D15H26V AC EXCIT
RCVRNC NC
E15C (E2-4)
2636 84328163722 32333435131430319101112 27 15 2324
115V AC

D63
M1321 EFSG-R (E2-3)C1127
B
ADF 2 AC
D71 K L JAj _aC_t _sf_g_h_npq_rXYZ_m _i F TU
D2431D
P6 CIRCUIT BREAKER

J14ADF-2 ON
OFF
NC D2431E
PANEL
ANT
GAIN ADF
F14Z
1000A B CD A BCDAB CD
E14YADF-2 BRGT348
TEST
KHZ 0.5D14X
KHZ 100 KHZ 10 KHZ 1 KHZ
OFF OFF
HV D71
D15HLV H
ADF-2
ANT ANT
26V AC EXCITEXCIT
E15 C
GND

ADF ADF
26V AC
TEST
A
XMFRM1319 EFSG-L (E2-3)
(STA 295
A
26V AC
OFF
FROM

WL 165
ANT
D71 AUDIO FLT INPH SYSP8 PANEL
ANT ADF
RBL 20) B ADF
W
OFF TEST
(23-51-00)LIGHTING
TEST
1 GAIN
OFF D69
2
1
1200.5 1650.5
ADF-1P
A
F
CONTROL
DTONE
WW
RCVR
12
5V AC
F
ANT ADF
(33-11-00)
OFF TEST
TONE 1 TEST INDICATIONS ARE
GAIN
W W
2
RDDMI POINTER TO 315 | 5 DEGREES1. (RELATIVE TO LUBBER LINE)
M
1020 HZ AUDIO TONE OUTPUT2.
 45 DEGREE GONIO METER INDICATION 3. ON RECEIVER FRONT PANEL
ADF CONTROL PANEL (P8)
ADF System Schematic
Figure 3 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-57-01
 ú ú 03 Page 7 ú Nov 12/01

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 B.  The fixed loop antennas are flush-mounted from outside in an individual antenna cavities on the bottom center of the fuselage at stations 560 and
 600. The antennas have no moving parts.
 3.  Quadrantal Error Corrector
__________________________
 A.  The airplane wings and fuselage interact with the field of an incoming rf signal to distort the reception pattern. The quadrantal error corrector compensates the loop antenna signal through fixed attenuators which remove this pattern distortion (quadrantal error) from the incoming rf signals. The error corrector then couples the corrected rf signals into the loop antenna transmission cable.
 B.  The quadrantal error correctors are mounted directly on top of the loop antennas inside the loop antenna mounting cavities. Removal as individual units is possible only after the respective loop antenna has been removed.
 4.  Loop Antenna Transmission Cable
_______________________________
 A.  The corrected loop antenna rf output is transmitted from the loop antenna cavity to the receiver by the loop antenna transmission cable. This cable consists of a bundle of four twisted coaxial transmission lines in a sheathed cover.
 5.  Sense Antenna
_____________
 A.  Two ADF sense antennas are installed, one on the left wing-to-body fairing and the second on the right wing-to-body fairing. The antennas are located aft of the aft wheel well bulkhead at station 727B. A metal coating on the fairings is used as the antenna element.
 B.  The sense antennas provide a nondirectional reception pattern and high signal strength to the receivers.
 6.  Sense Antenna Coupler
_____________________
 A.  A coupler is used in each of the ADF systems to match the capacitance of the sense antenna to the capacitance of the transmission line between the antenna and the receiver. The coupler contains the necessary circuits to provide optimum performance. The total capacitance of the sense antenna, coupler, and line, as seen by the receiver input, is approximately 3000 pF.
 B.  The couplers are mounted near their respective sense antenna at station 727B, waterline 160 and buttock line 45.
 7.  Receiver
________
 A.  The receiver is a transistorized, superheterodyne radio receiver that processes amplitude-modulated, rf signals within the frequency range of 190 to 1749.5 kHz, and produces a synchro output representing relative compass bearing to the rf transmitter site. It also produces an audio output from any modulation on the received rf signal for use in the flight interphone system.
　
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