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COMPONENT QTY AREA ACCESS DOOR REFERENCE
A55 ADF receiver 1 251C / 34-50-00
E35 ADF antenna 1 220 242 34-54-05
Circuit breaker : - CB92 "ADF" 1 230 232L WM
Automatic Direction Finder (ADF) - Electrical schematic
Figure 1
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Automatic Direction Finder (ADF) - Identification and location of components
Figure 2
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Validity : KR 87 with EFIS 34 54 00Page 3
(cm) FEB 00
3. DESCRIPTION
A. A55 ADF receiver (Figure 3)
A55 ADF receiver is destined to receive signals within a frequency range from 200 KHz to 1799 KHz in 1-KHz increments. It determines the ground station bearing information which is then forwarded to the indicators for information display.
A55 ADF receiver consists of a parallelepipedic rectangular box.
The rear section of the box features an antenna receptacle and a receptacle composed of a printed board plate.
The front panel of A55 ADF receiver consists of :
- a display for frequency, mode and time information visualisation. The display brightness is automatically controlled by a photocell.
The display is divided in two windows : "USE" and "STBY/TIMER".
The frequency in use is displayed in the "USE" window.
The "STBY/TIMER" window displays :
. a standby frequency,
. or the time elapsed since the equipment energization ("FLT" function selected),
. or the time elapsed or remaining since the "ET" function initialization ("ET" function selected).
- the following controls :
the "ADF" pushbutton which determines the receiver function mode, Automatic Direction Finder (ADF) mode or antenna (ANT) mode,
the Beat Frequency Oscillator "BFO" pushbutton which permits the identification of unmodulated stations which use an interrupted carrier (A1) for identification purposes,
the "FRQ" pushbutton,
The receiver is at all times tuned to the frequency displayed in the "USE" window. The "FRQ" pushbutton enables the frequency previously selected in the "STBY/TIMER" window to be transferred into the "USE" window.
the "ET/FLT" pushbutton makes it possible to display in the "STBY/TIMER" window one of the two timer functions :
- the "FLT" (Flight Timer) function which measures the flight duration. The duration measurement starts as soon as equipment energization,
- the "ET" (Elapsed Time) function is a programmable countdown timer.
the "SET/RST" button enables the pilot to program the countdown time of "ET" function, the "OFF/VOL" control switch ensuring the ON/OFF function and audio volume adjustment, the concentric knobs which allow either :
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本文链接地址：TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 2(46)
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