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All The "BFO" function makes it possible to more easily identify ADF stations using an interrupted carrier for identification. B. "ADF" mode The "ADF" mode is selected and annunciated when "ADF" pushbutton is in the in position. A55 ADF receiver processes the loop and sense signals from E35 antenna and provides bearing information (DC sine/cosine format) to the radio magnetic indicator. AFAF Validity : KR 87 / KR 87 SC+ with RMI 34 54-00Page 7 (BU) JUN 04 1 - A55 ADF receiver 2 - Frequency select knob 3 - "OFF/VOL" control switch 4 - "SET/RST" pushbutton function "ET" 5 - "ET/FLT" pushbutton 6 - "FRQ" or "FRQ/<->" pushbutton 7 - "BFO" pushbutton 8 - "ADF" pushbutton 9 - Operating frequency L.H. window 10 - (STBY) standby frequency R.H. window, "FLIGHT TIME" or "ELAPSED TIME" 9 10 1 KR 87 9 10 KR 87 SC+ ( SLIVER CROWN PLUS ) Automatic Direction Finder (ADF) - A55 ADF receiver Figure 3 AFAF Validity : KR 87 / KR 87 SC+ with RMI 34 54-00Page 8 (BU) NOV 01 AUTOMATIC DIRECTION FINDER (ADF) DESCRIPTION AND OPERATION 1. GENERAL (Figures 1, 1A and 1B) The Automatic Direction Finder (ADF) is a direction-finding device which allows to determine the direction of a radioelectric transmission. The optional ADF installation gives azimuth indications which allow to point a position and to do alignments. The ADF installation consists of : - an A55 ADF receiver, - an E35 ADF antenna, - an M77 ADF indicator. I The ADF indicator receives signals from the slaved directional gyro - refer to 34-21-00. The ADF installation is connected to the optional audio control box - refer to 23-11-00. The system is electrically supplied by "BUS 1" or "BUS 2" or "BUS 3" bars. NOTE : For RUSSIAN and UKRAINIAN aircraft, ADF system is electrically supplied by "BUS 1" bar. 2. LOCATION (Figure 2) COMPONENT QTY AREA ACCESS DOOR REFERENCE A55 ADF receiver 1 251 C or 254R / 34-50-00 E35 ADF antenna 1 220 242 34-54-05 M77 ADF indicator 1 251 L / 34-54-00 Circuit breaker : - CB92 "ADF" 1 230 232L WM Automatic Direction Finder (ADF) - Electrical schematic Figure 1 - 14 volts without radio master Automatic Direction Finder (ADF) - Electrical schematic Figure 1A - 14 volts with radio master AGAG Validity : KR 87 - KR 87 SC+ / KI 227-01 34 54-00Page 3 (CA) NOV 01 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 2(36) |
