Front Panel Operation; Idt (Ident); On/Altitude Mode; Ground Mode - Honeywell BENDIX KING KT 73 Installation Manual

Preliminary - Subject To Change Without Notice
BENDIX/KING
3.3.2

FRONT PANEL OPERATION

Refer to figure 3-1 for an illustration relating to front panel operation.

IDT (IDENT):

The KT 73's Ident pushbutton (marked IDT) is pressed when the ground control requests an
"Ident" or "Squawk Ident" from the aircraft.
An input pin is located on the rear connector for an external ident pushbutton.
The external and front panel IDENT operate identically in all applicable modes of operation.
The SPI pulse is not be transmitted when replying to Mode C interrogations.
(a)

On/Altitude Mode

Depressing the "IDT" momentary contact switch while in the ON or ALTITUDE
mode:
(b)

Ground Mode

Depressing the "IDT" momentary contact switch while in the GROUND mode:
4096 ID CODE:
While in the Standby, Ground, On, or Altitude modes, the 4096 code is displayed in the IDENT
window on the right side of the display.
Modification of the 4096 code is performed via the VFR push button or four Transponder Code
Selector Knobs. Each knob selects a separate digit of the identification code.
The 4096 Identification code digits range from 0 to 7.
(a) Code Entry
Upon entering a 4096 code:
Rev 0, October/2002
1. will cause the special position identification pulse (SPI) to be
appended to Mode A replies for a period of 18 ± 1 seconds.
2. will be reflected in the Flight Status field of Mode S downlink
format 4 and 5 replies for a period of 18 ± 1 seconds.
3. will cause the unit to display the "IDT" nomenclature for a
period of 18 ± 1 seconds.
4. will be reflected in the ME field of Mode S downlink 17 for a
period of 18 ± 1 seconds.
1. will cause the special position identification pulse (SPI) to be
reflected in the Flight Status field of Mode S downlink format
4 AND 5 replies to discretely addressed Mode S interroga-
tions for a period of 18±1 seconds.
2. will cause the unit to display the "IDT" nomenclature for a
period of 18±1 seconds.
The new 4096 ID code will be stored in EEPROM 3.5 ± 0.5
1.
seconds after the entry is completed.
The new 4096 ID code will be transmitted 3.5 ± 0.5 seconds
2.
after the entry is completed.
3. If the "IDT" push-button is depressed, the chosen code will
be immediately stored in EEPROM and transmitted along
with the appropriate Mode A SPI pulse in response to a
Mode A interrogation.
10563I00.JA
KT 73
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