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- or the programming of the timer function "ET". In ADF mode, A55 / A58 ADF receiver converts the RF signal generated by E35 / El 5 ADF antenna into a bearing information. The information is available in sine/cosine DC voltages format. A55 ADF receiver is electrically supplied by "BUS 2" or "BUS 1" bars and protected by CB92 "ADF" circuit breaker. A58 ADF receiver is electrically supplied by "BUS 3" bar and protected by CB118 "ADF 2" circuit breaker. A55 / A58 ADF receiver is mounted into PL30 radio rack. B. E35 / E15 ADF antenna E35 / E15 ADF antenna combines into a single component a reception loop and its associated circuits (preamplifier and modulators) and a sense antenna with its preamplification circuit. E35 / El 5 ADF antenna features on its longitudinal axis two holes for its attachment on the aircraft fuselage. The assembly is topped with a cylindrical box which houses the electronic circuits. An electrical connector is secured on the box. E35 / El 5 ADF antenna provides A55 / A58 ADF receiver via a triaxial cable with an RF signal resulting from the combination of the signals detected by the loop and the sense antenna. E35 / El 5 ADF antenna is electrically supplied by A55 / A58 ADF receiver via a multiwire shielded cable. E35 ADF antenna is mounted under the fuselage between C7 and C8 frames. E15 ADF antenna is mounted under the fuselage in front of C6 frame. 4. OPERATION NOTE : For equipment operation and maintenance, refer to the supplier's Maintenance Manual. AIAI Validity : KR 87 - ADF 1 + 2 34-54-00 Page 5 (co FEB 00 1 - A55 / A58 ADF receiver 2 - Frequency select knobs 3 - OFFNOL control switch 4 - Set and reset ELAPSED TIMER 5 - Select FLIGHT TIMER or ELAPSED TIMER 6 - Frequency transfer button 7 - Select BFO 8 - Select ANT and ADF modes 9 - IN USE Frequency 10 - STANDBY frequency, FLIGHT TIME or ELAPSED TIME 9 10 Automatic Direction Finder (ADF) - A55 ADF receiver Figure 3 AUTOMATIC DIRECTION FINDER (ADF) DESCRIPTION AND OPERATION 1. GENERAL (Figure 1) The radio compass 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 : - A55 ADF receiver, - E35 ADF antenna. The ADF installation sends ADF data to : - the radio magnetic indication system - refer to 34-25-00, - the symbol generator of the EFIS system - refer to 34-28-00. The ADF installation sends an audio signal to A50 audio control box - refer to 23-11-00. The system is electrically supplied by "BUS 2" bar. 2. LOCATION (Figure 2) 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(45) |
