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 B.  The fixed loop antennas are flush-mounted from outside in individual antenna cavities on the bottom center of the fuselage at stations 560 and
 600. The antennas have no moving parts.
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A
737-300/400/500MAINTENANCE MANUAL
FIRST OFFICER'S AFT ELECTRONIC
INSTRUMENT PANEL

CONTROL PANEL CAPTAIN'S SEE A
SEE B INSTRUMENT
PANEL
SEE A
ELECTRONIC EQUIPMENT RACK E-2

NARROW POINTER DME-1 DME-2 WIDE POINTERWARNING FLAG
WARNING FLAG NARROW POINTER (ADF 1)
WIDE POINTER (ADF 2)
ADF RECEIVER NARROW POINTER
NO. 2 MODE ANNUNCIATOR WIDE POINTER
SEE CMODE ANNUNCIATOR ADF RECEIVERVOR/ADF SWITCH VOR/ADF SWITCH

SYSTEM NO. 1 NO. 1
SYSTEM NO. 2 SEE C
RDDMI
A

SYSTEM 
TRANSFER  FREQUENCY  TONE  TRANSFER  TEST 
LIGHT  TRANSFER  SWITCH  LIGHT  INDICATOR 
SWITCH 
FREQUENCY  FREQUENCY 
INDICATOR  INDICATOR 
TFR  SYSTEM 
TEST 
SWITCH 
1 2 0  0 5  TONE  2 01  5 5 
A  OFF  ON 
D  ANT  ADF 
F  OFF  TEST 
GAIN 

FREQUENCY FREQUENCYGAINSELECTION KNOBS MODE SELECTION KNOBS
CONTROL
SWITCH
ADF RECEIVER NO. 1 AND NO. 2

ADF CONTROL PANELS BC
ADF System Component Location Figure 1 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL

FEED STUD

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 PLACES)

ADF LOOP ANTENNA AND QUADRANTAL ERROR CORRECTOR (EXAMPLE)

E
ADF System Component LocationFigure 1 (Sheet 3)
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A 737-300/400/500MAINTENANCE MANUAL

SENSE 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

LOOP 15 MHZ
DME-1 DME-2
BALANCEDBANDPASSFIRST SECOND3.6 MHZ
HHB0
CRYSTAL
GONI-
RF
OMETER

TEST 1ST
MODULATOR FILTERMIXER MIXER FILTER
FILTER
F FD
IF
TESTFREQ
EE E
INDICATOR
AAA
SYNTHESIZERBAND
1 ADF POINTER
2ND
TESTLOGIC D37
BB H
PHASE
VOR 1MIXER
HORIZ
　
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