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CAPTAIN'S FIRST OFFICER'S
INSTRUMENT INSTRUMENT PANEL
PANEL SEE B
SEE B
SEE C NO. 2 ADF LOOP ANTENNA
PILOT'S CONTROL MAIN E/E
SEE CENTER HATCH
STAND E
SEE A
AFT E/E
CENTER HATCH
VOL ADF
TEST
1
NO. 1 ADF LOOP ANTENNA
BFO ANT
ADF SENSE ANT COUPLERS
SEE D
OFF ADF NO. 1 ADF SENSE
AF,AZ,GN,LH,MD,IB,VM AIRPLANES NO. 2 ADF
ANTENNA
SENSE ANTENNA (RH SIDE OF(RH SIDE OF KEEL BEAM)KEEL BEAM)
TFR
VOL
BFO ADF
OFF ANT
AT AIRPLANES
FREQUENCY TEST
1250.5
ADF A
ANT
D
OFF ADF TONE F GAIN
OFF
RADIO MAGNETIC INDICATOR (RMI)
SN AIRPLANES B
ADF CONTROL PANEL
A
ADF System Component Location Figure 1 (Sheet 1)
EFFECTIVITY
AF 121,122,152-199; IB 406-499;CONFIG 2 LH 011-099; SN 303-399; 799 Page 2 AT, AZ, GN, MD AND VM ALL Sep 25/94
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LOOP ANTENNA TRANSMISSION CABLE
QUADRANTAL ERROR CORRECTOR
FIXED LOOP ANTENNA ADF RECEIVER
E
NO. 1 AND NO. 2
C COUPLER
STA 1170 NO. 1
STA 1170 FLAME SPRAY ANT SURFACE
COUPLER NO. 2COUPLER
NO. 2
NON-FLAME SPRAY
CONDUCTIVE ANT SURFACE
EDGE BAND
GAP NON-CONDUCTIVE
GND PLANE EDGE BAND GAP
PERIMETER FLAME SPRAY SPRAY CONTACT/FEED SENSE ANT FLAME FLAME SPRAY GND PLANE
FASTENER (TYPICAL) 43 PLACES EACH ANT MTG BOLT AND INBD STUD (TYPICAL) FWD PERIMETER NO. 1 COUPLER SPRAY CONTACT/FEED SENSE ANT FLAME STUD (TYPICAL)
SENSE ANTENNA COUPLERS 1 SENSE ANTENNA COUPLERS 2
D D
1 AF 121,122,152-155,172-197; AZ 221-224, 2 AF 156-171,198,199; AZ 201-220,225-230,234-280, 231-233,281; IB 406-410; LH 011-013,051-059, 282-299; IB 401-404,411-499; LH 014-050,060-081, 082,083; AT,GN,MD, AND VM ALL, LESS 084-099; SN 303-399; PLUS AF,AT,AZ,GN,IB,LH,MD, AIRPLANES INCORPORATING SB 34-2195 SN, AND VM AIRPLANES INCORPORATING SB 34-2195
ADF System Component Location Figure 1 (Sheet 2)
EFFECTIVITY
AF 121,122,152-199; IB 406-499; CONFIG 2 LH 011-099; SN 303-399; 799 Page 3 AT,AZ,GN,MD, AND VM ALL Sep 25/94
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ADF System Block Diagram
Figure 2
EFFECTIVITY AF 121,122,152-199; IB 406-499;
CONFIG 2 LH 011-099; SN 303-399; 799 Page 4
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AT, AZ, GN, MD AND VM ALL Sep 25/94
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 conductive coating flame-sprayed over a rectangular section of the underwing fairing surface of the airplane. The conductive surface of the antenna is coupled to the system receiver through a conductive surface feed stud, sense antenna coupler, and an rf transmission cable, in this order.
B. The antennas are separately removable and are located on the right side of the keel beam just forward of the right rear wheel well approximately at body station 1200. Access to the inboard surface of the antennas and the couplers can be attained thru the hinged air conditioning access panel on the underwing fairing.
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.
B. The sense antenna couplers are mounted inside the underwing fairing at the forward end of the sense antennas.
7. Receiver (Fig. 1)
________
A. The receiver is a transistorized, superheterodyne radio receiver that processes amplitude-modulated, rf signals within the frequency range of 190 kHz to 1750 kHz, and produces a three-wire 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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