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Using the beat frequency oscillator (BFO) function, the receiver produces a bearing to the station and also produces a 1020 Hz output tone when a carrier is present, in addition to the residual audio/noise from the detected carrier. A data-load option may be included so that the BFO audio output will be “clean”, i.e., contain no noise, even under low signal strength conditions.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
17-01-06
DESCRIPTION
The Mode S transponder system consists of two Mode S transponder units. Only one transponder unit is active at any one time, while the other has a standby role. The transponder system supplies ATC, or a traffic alert and collision avoidance system (TCAS) equipped aircraft with aircraft identification and altitude data in response to an interrogation. The transpon-der used with TCAS is equipped with two paired antennas to transmit and receive interrogations above and below the air-craft without the signal being masked by the airframe.
The transponder will go into ident mode for approximately 18 seconds when the ID function key is pushed and the annun-ciator illuminates.
COMPONENTS AND OPERATION ATC ANTENNAS
Each transponder system has two paired antennas. Each system has an upper and lower antenna located on the forward fuselage.
TRANSPONDER MODES
ATC/TCAS mode selection is as follows:
-STBY
-TA/RA
-TA ONLY
-ALT ON
-ALT OFF
Selecting STBY on either MFD causes the TCAS to go to standby mode. At system power up on the ground, the system powers up in standby mode.
TA/RA is the normal TCAS mode. When TA/RA mode is set, the TCAS computer generates intruder traffic symbology and resolution advisory vertical speed fly to commands. The intruder traffic symbology shows on the PFD and/or MFD when selected. RA vertical speed fly to commands show on the PFD vertical speed scale when commanded by the TCAS.
RAs are not displayed when TA ONLY is the active mode. This annunciation is displayed in cyan when TA ONLY mode is selected. This annunciation turns yellow and flashes when a TA is present.
ALT ON mode is used when ATC transponder mode C operation is desired, but TCAS operation is not. The TCAS com-puter does not show traffic on the displays, does not issue resolution advisories, and the ATC transponder does not reply to other aircraft TCAS interrogations. Mode C is not reported when interrogated by ATC.
ALT OFF mode is used when TCAS and ATC transponder operation is not desired. The TCAS computer does not show traffic on the displays, does not issue resolution advisories, and the ATC transponder does not reply to other aircraft TCAS interrogations. Also, mode C is not reported when interrogated by ATC.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
17-01-07 TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS)
DESCRIPTION
The TCAS II system is an airborne traffic alert and collision avoidance system that interrogates transponders in nearby air-craft and uses computer processing to identify and display potential and predicted collision threats. The system protects a volume of airspace around the TCAS equipped aircraft. The system provides appropriate aural and visual advisories to the flight crew to provide adequate separation when the computer analysis of intruding aircraft transponder replies predicts a penetration of the protected airspace. The TCAS II system provides two types of advisories. A traffic advisory (TA) indi-cates the relative position of an intruding aircraft that is approximately 35 seconds from the closest point of approach and may, a short time later require a resolution advisory (RA). The TA provides the flight crew with the opportunity to visually acquire the intruding aircraft. An RA will produce a threat resolution in the form of a vertical maneuver that will increase separation when the computer predicts the intruder aircraft is within approximately 25 seconds from the closest point of approach.
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