ATCRBS TRANSPONDER KT 76C REVISION HISTORY INSTALLATION MANUAL BENDIX/KING KT 76C ATCRBS Transponder PART NUMBER DATE DESCRIPTION --------------------------------------------------------------------------------------------------------------------- 006-10545-0003 May/2004 Referenced drawing for dimensions and weight. 006-10545-0002 May/2004 Added version -0201 006-10545-0001 Dec/1999 Rev 3, May 2004 IM 006-10545-0003.dwd RH-1...
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SECTION I GENERAL INTRODUCTION This manual contains information relative to the physical, mechanical, and electrical characteris- Honeywell tics of the Silver Crown KT 76C ATCRBS Transponder. Installation and operating procedures are also included. Information relative to the maintenance, alignment, and procure- ment of the replacement parts may be found in the KT 76C Maintenance/Overhaul Manual, P/N 006-15545-00XX (XX = latest revision available).
ATCRBS TRANSPONDER KT 76C Table 1-1 KT 76C Technical Characteristics Sensitivity and Dynamic Range: The minimum triggering level (MTL) is defined as the minimum input power level that results in a 90% reply ratio if the interrogation has nominal pulse characteristics.
300 ohms and 1850 Suppression In The transponder will be suppressed if the voltage applied to this pin is above 6 V dc. This pin follows an Honeywell standard. Rev 3, May 2004 IM 006-10545-0003.dwd...
ATCRBS TRANSPONDER KT 76C Table 1-1 KT 76C Technical Characteristics Side Lobe Suppression Characteristics: SLS Decoding and Dynamic Range: A. When the RF input signal is varied from MTL +3 dB to 50 dB above MTL and the level of P2 equals or exceeds the level of P1 spaced 2.0 +/- 0.15 µsec from P1 the transponder will reply to no more than 1% of the interrogations.
Rigid mounting 6 G operational 15 G crash safety. UNITS AND ACCESSORIES SUPPLIED 1.4.1 CONFIGURATIONS AVAILABLE Table 1-3 lists the available configurations of the transponder and the features contained in each configuration. Table 1-3 KT 76C Configurations Available HONEYWELL SUPPLY LAMP MOUNTING CIRCULATOR PART NUMBER VOLTAGE...
The following parts are recommended for a cable setup with dimensions of 4.5 feet to 11 feet: (See Figure 2-5, Sheet 1 of 2). Table 1-5 Cable Setup 4.5 to 11 Feet HONEYWELL PART NUMBER DESCRIPTION QUANTITY 006-01058-0005 Connector Assy Procedure...
FCC Form 404 is kept in the aircraft. This equipment has been type accepted by the FCC and entered on the type accepted equipment list, as Honeywell KT 76C and must be identified as Honeywell KT 76C on your Form 404, Aircraft Radio Station License application.
ATCRBS TRANSPONDER KT 76C SECTION II INSTALLATION GENERAL INFORMATION This section contains suggestions and factors to consider before installing the KT 76C ATCRBS Transponder. Close adherence to these suggestions will assure a more satisfactory performance from the equipment. The conditions and tests required for TSO approval of this article are minimum performance stan- dards.
Recommendations on stack cooling are contained in Honeywell Installation Bulletin #55. Failure to provide stack cooling will certainly lead to increased avionics maintenance costs and may void the warranty.
ATCRBS TRANSPONDER KT 76C Primary Power and Circuit Breaker Requirements and Wiring The KT 76C transponder receives primary power from an aircraft by aircraft power circuit breakers. The KT 76C is designed to operate from 11-33 V dc. Power connections, wire sizes, and circuit breaker requirements are shown on the interconnection diagram Figure 2-2.
ATCRBS TRANSPONDER KT 76C To prevent rf interference, the antenna must be physically mounted a mini- mum distance of three feet from the KT 76C and the wiring harness. The transponder antenna should be mounted a minimum of six feet away from the DME antenna, four feet from the ADF sense antenna, and three feet from TCAS antennas.
ATCRBS TRANSPONDER KT 76C Antenna General For L-band blade antenna outline drawing, installation procedures, and mounting dimensions, refer to the manufacture’s instructions. KA 60 Peel backing off the antenna template and apply the template to the aircraft at the desired mounting location. Drill or cut the proper size holes for mounting the antenna, then re- move the template.
ATCRBS TRANSPONDER KT 76C Power Requirements Voltage Change Kit Removal On 28 V dc installations a voltage changeover kit (P/N 050-01578-0000) was installed. The 10-Ω, 55-W, resistor, (132-00113-0004) must be re- moved from pin 11 in the wiring harness. Additional Supply Line (Recommended but not required) Add pin 12 to support the additional current (see Figure 2-2, sheet 1, for...
ATCRBS TRANSPONDER KT 76C When the ejector is positioned against the stop the locking key of the contact is raised, allowing the contact to be removed by pulling moder- ately on the lead. Neither the contact or position is damaged by removing a contact; how- ever, the contact should be checked visually before reinstalling in con- nector, to be certain that retaining tab “A”...
ATCRBS TRANSPONDER KT 76C FIGURE 2-1 Crimping Tool (Sheet 2 of 3) Rev 3, May 2004 IM 006-10545-0003.dwd Page 2-8...
ATCRBS TRANSPONDER KT 76C Once the terminal is in the correct position, close the jaws gently until the terminal is held loosely in place. Push the wire stop down so that it rests snugly behind the contact portion of the terminal. Strip off 1/8 inch of the wire insulation and insert the wire through the insulation tabs into the conductor tabs until the insu- lation hits the conductor jaw face or until the conductor touches the wire stop.
ATCRBS TRANSPONDER KT 76C FIGURE 2-2 KT 76C Interconnect Diagram (Sheet 1 of 3) Rev 3, May 2004 IM 006-10545-0003.dwd Page 2-10...
ATCRBS TRANSPONDER KT 76C FIGURE 2-2 KT 76C Interconnect Diagram (Sheet 2 of 3) Rev 3, May 2004 IM 006-10545-0003.dwd Page 2-11...
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ATCRBS TRANSPONDER KT 76C Main Connector - J1 Front View Pin Number......Description 1..........Aircraft Ground 2..........14 V Lighting (See Note) 3..........28 V Lighting 4..........Suppression In/Out 5..........+5 Vdc Test Point 6..........-6.2 Vdc Test Point 7..........Reserved 8..........
ATCRBS TRANSPONDER KT 76C POST INSTALLATION TEST PROCEDURE 2.4.1 TRANSPONDER SYSTEM CHECKOUT The post-installation test is used to apply power and functionally checkout the system. Successful completion of the post-installation test verifies the proper operation of the KT 76C ATC Transpon- der System.
ATCRBS TRANSPONDER KT 76C System Interconnect Check To check the aircraft and transponder system interconnections proceed as follows: Check that all cables and interwiring are installed in accordance with the Interwiring and Cable Harness Fabrication instructions (paragraph 2.3.3). Using the interconnect diagram (see Figure 2-2), check wiring for proper destination, opens, and shorts.
ATCRBS TRANSPONDER KT 76C Verify that the ID code entry is initiated by pressing one of the eight code selection switches. The left most significant (MSB) display digit will change to reflect the code selection switch that was pressed and the remaining three display digits are re- placed by dashes.
ATCRBS TRANSPONDER KT 76C TABLE 2-2 Ramp Tests PASS/FAIL CRITERIA TEST DESCRIPTION Measures the effective radiated power RF Power Output Minimum of 125 watts. output from the antenna. 1090 MHz +/- 3 MHz. RF Frequency Measures the transmit frequency. -73 dBm +/- 4.0 dBm. ATCRBS Receiver Measures the receiver minimum triggering Sensitivity...
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ATCRBS TRANSPONDER KT 76C SECTION III OPERATION GENERAL The following paragraphs describe the operation of the KT 76C. Illustrations of the displays are furnished to assist the operator in understanding the operation of the unit and also provide a visual aid for programming sequences.
ATCRBS TRANSPONDER KT 76C Standby - The unit is energized, but is inhibited from replying to any interrogation. “SBY” is annun- ciated on the display in this mode. The altitude display is blank (see Figure 3-2). FIGURE 3-2 Standby TST - The unit will illuminate all segments. The unit will remain in TST mode until the mode se- lection is changed (see Figure 3-3).
ATCRBS TRANSPONDER KT 76C FIGURE 3-4 Unit ON Altitude - The unit is able to reply to all valid Mode A and Mode C interrogations. The altitude in- formation will be sent in Mode C replies. The ID 4096 code will be displayed on the right and the altitude displayed on the left.
ATCRBS TRANSPONDER KT 76C FIGURE 3-6 Ident ID CODE The 4096 Identification code, ID code, for the aircraft is displayed in the right hand position of the display, the Ident window. There are eight pushbutton switches (0 through 7) used to select the 4096 ID code. The ID code may be selected in the Standby, On, and Altitude modes.
ATCRBS TRANSPONDER KT 76C Place the unit in Standby Enter in the desired VFR code with the ident code pushbutton switches. Depress the “VFR” pushbutton while holding the “IDT” pushbutton in its depressed position. NOTE Pressing and holding the “VFR” Pushbutton for two seconds will retrieve the last non-VFR 4096 code.
ATCRBS TRANSPONDER KT 76C FIGURE 3-8 Altitude Display DISPLAY BRIGHTNESS ADJUSTMENT Display Adjust The display has an adjustment to compensate the brightness for differ- ent vendors and/or aging of the display. The brightness is adjusted in the test (TST) mode. To adjust the display brightness, perform the following steps: Turn the mode select knob to “TST”.