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"Low" (Low sensitivity) position : the receiver sensitivity is decreased, "Test" position : test function, - three indicator lights (2). Each indicator light has a marking engraved on a cover of a different color. The illumination of the lamp located inside each section indicates to the pilot that the ground beacon has been flown over. AFAE Validity : PMA 7000MS 34-31-00 (Bu) Page 1 NOV 01 The marker receiver is electrically supplied by "BUS 1" bar and protected by CB 84 "AUDIO" circuit breaker. The marker receiver is mounted on PL30 radio rack. B. E38 marker antenna Marker antenna is an horizontally-polarized aerial used for omnidirectional reception of 75-MHz VHF signals. It is a low profile antenna 14.6 inch (37 cm) long. It is secured under the fuselage on the R.H. or L.H. side between CO and C1 frames. 4. OPERATION The "RADIO MASTER" switch enables the system to be energized. When the aircraft crosses the beam of a ground beacon transmitter, the marker receiver receives the signal detected by the antenna. Once the useful signal of the carrier wave has been extracted, the marker receiver provides the pilot with a visual indication of the appropriate color. The associated audio signal triggers. Holding the mode selector in the "Test" position triggers a simultaneous test of the three indicator lights of the marker receiver. AFAE Validity : PMA 7000MS 34-31-00 (.,) Page 2 NOV 01 A - A50 audio control panel B - E38 marker antenna TB 9, 10, 200, 20 C - E38 marker antenna TB 21 D - E38 marker antenna (Variant) Marker - Identification and location of components AFAE |
