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The Bendix KT 70 Transponder has five knob and two buttons. The four little knobs ar for setting xpndr code and the big one to select mode. Clicking and display areas
Operation We describe below the operation of the KT 70. The display is emulated but, in FS9, the gauge always works in the same manner. What you see in the display are the screens you see in the real KT 70 IDENT Button Marked IDT, the KT 70 Ident button is pressed when ATC requests an “Ident” or “Squawk Ident” from your aircraft. When the Ident button is pressed, the reply indicator, an “R” annunciator light will glow for approximately 18 seconds. ID Code The ATCRBS Transponder Identification code (squawk code) for the aircraft is displayed in the Ident Window on the right side of the display. Each of the four Transponder Code Selector Knobs selects a separate digit of the identification code. Reply The lighted “R” reply indicator blinks when the transponder is replying to a valid interrogation and illuminates for 18 seconds after the initiation of the Ident. Altitude Display The KT 70 display Flight Level Altitude, marked by the letters “FL” and a number in hundreds of feet, on the left side of the display (A). For example, the reading “FL 071” corresponds to an altitude of 7,100 feet. VFR Pressing the VFR Pushbutton recalls the preprogrammed VFR code, superseding whatever code was previously entered. Function Selector Knob The Function Selector Knob on the right side of the KT 70 enables you to choose from among the following operating modes: OFF - The unit is not receiving power. SBY (STANDBY) - In Standby the unit is energized but is inhibited from replying to any interrogation. “SBY” is shown on the display, while the altitude display is disabled.
TST (TEST) - Replies are disabled in test mode, and the unit illuminates all segments of the display for at least four seconds. A series of internal tests is performed to check the KT 70/71's integrity, verifying all EEPROM data and making hardware and squitter checks.
GND (GROUND) - In the KT 70, ATCRBS (Air Traffic Control Radar Beacon System) Mode A&C interrogations are inhibited, but the KT 70 will reply to all valid Mode S interrogations, provided a Mode S status bit is set to indicate the aircraft is on the ground. In both units, the ID code is shown on the right side of the display, with altitude reported on the left side. The letters “GND” are also displayed in this mode.
ON - The KT 70 is able to reply to all valid Mode A, C and S interrogations (Mode A and C on the KT 71). However, the altitude information will not be transmitted. In the ON mode, the altitude window is left blank, the ID code is shown on the right and the “ON” annunciation is shown on the display.
ALT - In the “ALTITUDE” mode, the KT 70 replies to all valid Mode A, C and S interrogations. The ID code is displayed in the right window and altitude information (in hundreds of feet) is shown on the left.
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