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 B.  Two antennas are mounted on the bottom centerline of the fuselage approximately at body stations 1005 (system No. 1) and 1068 (system No. 2). Each unit is flush-mounted from outside the airplane in an individual antenna cavity.
 3.  Quadrantal Error Corrector (Fig. 1)
__________________________
 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 a significant amount of the 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 their respective loop antenna assemblies inside the loop antenna mounting cavities. Removal as individual units is possible only after the loop antennas have been removed.
 4.  Loop Antenna Transmission Cable (Fig. 1)
_______________________________
 EFFECTIVITY

 AF 101-156; IB 405;  CONFIG 1 LH 001-003; SN 301-302  04 Page 1  Apr 25/86

34-57-00
NO. 1 ADF
MAIN E/E LOOP ANTENNA
CENTER HATCH SEE C
NO. 1 ADF SENSE ANTENNAAFT E/E
CENTER HATCH 2
NO. 2 ADF
LOOP ANTENNA

ADF SENSE ANT COUPLERS
SEE E  ADF SENSE ANTENNA
SEED 1 COUPLERS
SEE D 2  NO. 1 ADF SENSE ANTENNA
1
NO. 2 ADF
SEE B NO. 2 ADF

SENSE ANTENNA
SEE  B SENSE ANTENNA
12
1  ADF SENSE ANTENNAS AND COUPLERS LOCATED AFT OF WHEEL WELLS ON AIRPLANES NOT INCORPORATING SB 34-2114
2  ADF SENSE ANTENNAS AND COUPLERS LOCATED FWD OF RH WHEEL WELL ON AIRPLANES INCORPORATING SB 34-2114
3 ADF SENSE ANTENNA COUPLERS ARE MOUNTED DIRECTLY TO FAIRING J-BEAM ON AIRPLANES SEE A INCORPORATING SB 34-2195
SEE A
BEAT FREQUENCY
OSCILLATOR SWITCH
AND TONE CONTROL
GAIN FREQUENCY CONTROL INDICATOR
MODE
ANT LOOP SELECTOR
GAIN ADF
SWITCH
BFO  OFF LOOP
A
D1 2 3 4 5
LOOP
F

ANTENNA ADF CONTROL
TUNING
RADIO MAGNETIC INDICATOR
CONTROLS B
ADF CONTROL PANEL
A
ADF System Component Location Figure 1 (Sheet 1)
EFFECTIVITY

 CONFIG 1
AF 101-156; IB 405;
799 Page 2
LH 001-010; SN 301,302
34-57-00
Apr 25/86
QUADRANTAL ERROR CORRECTOR
FIXED LOOP ANTENNA
E
SENSE ANTENNA COUPLER
ADF RECEIVER NO. 1 AND NO. 2
ANTENNA CABLE
C
COUPLER ELECTRICAL
NO. 1 STA 1170 CONNECTOR
NO. 1 SENSE
ANTENNA FLAME
NO. 1 COUPLER STA 1170
SPRAY ANT 1
INSTALLATION
SURFACE COUPLER NO. 2COUPLER
NO. 2
NON-FLAME SPRAY
CONDUCTIVE ANT SURFACE
EDGE BAND GAP NON-CONDUCTIVE
EDGE BAND GAP
GND PLANE 
FLAME SPRAY 
PERIMETER  MTG BOLT AND 43 PLACES EACH ANT FASTENER (TYPICAL)  NO. 2 SENSE ANTENNA FLAME SPRAY CONTACT/ FEED STUD (TYPICAL)  GND PLANE FLAME SPRAY PERIMETER  COUPLER NO. 1  SENSE ANT FLAME SPRAY CONTACT/FEED 
INBD  FWD  STUD (TYPICAL) 
2COUPLER INSTALLATION  3COUPLER INSTALLATION 

SENSE ANTENNA COUPLERS
D
ADF System Component Location
Figure 1 (Sheet 2)

EFFECTIVITY

 CONFIG 1 AF 101-151; IB 405; 799 Page 3LH 001-010; SN 301,302 Apr 25/86
34-57-00

ADF System Block Diagram
Figure 2

EFFECTIVITY CONFIG 1
AF 101-151; IB 405;

799 Page 4LH 001-010; SN 301,302
34-57-00
Apr 25/86
 A.  The corrected loop antenna rf output is transmitted from the loop antenna cavity to the receiver in the aft center equipment center 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 (Fig. 1)
_____________
 A.  A sense antenna is a nondirectional, high gain, rf pickup device for the automatic direction finder system receiver. The antenna consists of a flame-sprayed rectangular conductive coating and ground plane perimeter on the surface of the airplane. The conductive surface of the antenna is coupled to the system receiver through the sense antenna coupler and a rf transmission cable.
 B.  The antennas are sprayed on a portion of the wing-to-body fairing just aft of the right and left rear wheel wells, approximately at body station 1490.
 6.  Sense Antenna Coupler (Fig. 1)
_____________________
 A.  The sense antenna coupler matches the capacitance of the sense antenna plus the sense cable capacitance to the receiver input.
　
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