KT 76/78 TRANSPONDER INSTAllATION MANUAL 006-0067-01 R E\1.
This equipment manufactured under the following U.S. Patent: 3, 366,834 ONE FULL YEAR WARRANTY General Aviation Avionic products manufactured by King Radio Corporation (hereinafter called King) are warranted against defects in design, workmanship and material under normal use for which intended for one year after warranty registration provided such registration occurs within eighteen months of the factory shipping date.
0 0 0 D AlliedSignal General Aviation Avionics 400 Norrh Rogers Road 411iedSignal AEROSPACE Olarhe, Kansas 66062-1212 BENDIX/KING®Service Aid Service. Aid: 0 D D 0 0 KT 76/KT 78-102 Transponder SUBJECT: Mode A and C updates to improve reliability. Reliability of the KT 76/78 can be improved by removing and replacing the components listed below and careful alignment of the decoder one-shots. Remove and replace the components in the unit with the ones in the following list.
0 0 0 THIS INFORMATION PROVIDED BY STICKS AND STONES PROD. WE HOPE THAT IT IS USEFUL. 0 J(T 76A Troubt~hootin2 Tips Poor sen$itivity ? When working on a KT 76A that has poor sensitivity, check the following caps: C440, C441, C442, C443, C444. · If these caps are black in color, replace them all. The new ~ps will be ):ellow in color. Erratic sensitivity? . When repairing a KT 76Ayou discover that the unit exhibits erratic sensitivity, check the ·6.2Vdc power supply line. This line should read between ·5.
0 0 0 D 0 0 D 0 0 ~ KING KT 76/78 TRANSPONDER TABLE OF CONTENTS SECTION I GENERAL INFORMATION Paragraph Page 1. 1 1. 2 1-1 1-1 1-1 1-3 1-4 1-5 1. 3 1. 4 1. 5 1. 6 Introduction General Description Technical Characteristics Units and Accessories Supplied Accessories Not Supplied Lie ense Requirements SECTION II INSTALLATION 2, 1 2.2 2.3 2.4 2. 5 2. 6 2.7 2.
~ KING 0 HISTORY OF REVISIONS REV. 1, December, 1972 0 Description of C:hange Front l-3, 1-4 2-4 2-5 2-6 2-7 2-9 2-10 2-11 2-12 2-13 3-2 0 0 H.evision No's Added Installation Kit Parts Lists Updated Misspelled Word Clarification of "596" Drawing Number Clarification of "696" Drawing Number Revised Installation Drawing Clarification of 11 696 11 Drawing Number New Connector Number Shown Clarification o.
0 D 0 0 0 0 D 0 0 0 0 0 D 0 0 0 0 0 ~ KING KT 76/78 TRANSPONDE R SECTION I GENERAL INFORMATION 1.1 INTRODUCTION Thi s manual contai ns information relative to the physical, mechanical , and electrical characteristics of the King H.adio Corporation Silver Crown KT 76/78. Information relative to the mai ntenanc e, alignment and procurement of replac e ment parts may be found in KT 76/78 Maintenance/Overhaul Manual, KPN 006-5058-00. 1.
0 D ~ KING KT 76/78 TRANSPONDER 0 SPECIFICATIONS CHARACTEIUSTICS APPLICABLE DOCUMENTS: TSO C74b, UTCA D0-138 TEMPERATURE RANGE: - 15° C to +55° C for continuous operation HUMIDITY RANGE: Up to 95o/o at +50° C ( +122° F) for 12 hours WEIGHT: 3. 0 lbs. including Mtg rack 0 INSTALLATION SPACE: 14 volt - 6. 25 X 1. 63 X 10.00 in. ( 15. 88 X 4. ~4 X 25. 4cm) 28 volt- 6. 25 X 1. 63 X 11. 00 in. ( 15. 88 X 4. 14 X 27.
0 0 0 0 0 0 D 0 0 0 ............. KING KR 76/78 TRANSPONDER 1.4 UNITS AND ACCESSORIES SUPPLIED A. B.
0 0 ........_.. KING KT 76/78 T HANS PONDER 1.5 ACCESSORIES NOT A. SUfj~-LIED Voltage change over kit H'4 to 2SVOC) 050'-1247-00 Parts List as follows: · · KPN DESCRIPTION 047-2445-00 057-1395-01 089-2009-37 089-2016-37 089-5878-04 089-5991-12 089-8112-34 091-0009-00 132-0 113 -04 Shield, Heat L.amp Voltage Plate &ll v Nut, Rex, #4-40 Nut, Hex, # 10-32 Screw, P. H. P, #4-40 x 1/4 Springtite Screw, PHP 10-32 x 3 / 4 Washer, Lock# 10 Gro.m10et, 1/8 I. D. H.esistor, W. W. 10 ohm, 55W, 5o/o B.
0 0 0 0 0 0 0 0 0 0 ~ KING KT 76/78 TRANSPONDER 1.6 LICENSE REQUIREMENTS T he transmitter as installed in the aircraft, requires an Aircraft Radio Station Lice nse. This license is obtained by filing FCC Form 404. The KT 76 or KT 78 may be operated for up to 30 days without a station license, after filing the FCC Form 404 and while awaiting the receipt 0f the station license, providing a copy of the I•'CC Form 404 is kept in the aircraft.
0 0 0 0 0 0 0 0 0 0 ~ KING KT 76/78 T :RANSPOND.gR SECTION II INSTALLATION 2.1 GENERAL Installation of the KT 76/78 will differ according to equipment location and other factors. Cable harnesses will be fabricated by the installing agency to fit these various requirements. This section contains interconnect diagrams, mounting dimensions and information pertaining to installation. 2.2 UNPACKING AND INSPECTING ·EQUIPMENT Exercise extreme care when unpacking the equipment.
~ KING KT 76/78 TRANSPONDI!~ R / I ... 0 -- '", 0 \ ..) fi __g ) - - ;· \ a 14a ' ..... "1--..T __ .,.. / F:IGURE 2-lA +13. 75VDC OPERATION .,.- ... '/tt~!l ', jI 0 -- \ . o .0 \. e / ' ... - ... FIGURE 2-1B +27. 5VDC OPERATION (Dwg. No. 696-3002-00) l<'IGUH.E 2-1 3} VOLTAGE CHANGEOVER O.F FRONT PANE L Install the 10 ohm 55W resistor in s eries with the power input pin for 28V operation. The series resistor is not required in 14V installations. See Figure 2-3. 2.
D D 0 ~ KING KT 76/78 TH.ANSPONDEH. 7. Turn Allen wrench clockwise until .rear lobe engages with the tray slot. Continue turning wrench clockwise until tight. -CAUTION- 0 D 0 0 0 Do Not Ove rtighten Locking Screw 8. 2.6 CONNECTOR ASSEMBLY PROCEDURE The KT 76/78 uses a special connector that mates directly with the Printed Circuit noard inside the unit. Assembly of the connector is as follows: A. Contact Terminal Assembly Using Molex Crimper (Figure 2-2) 1.
~ KING KT 76/78 TRANSPONDER C. D. Contact Insertion into Molex Connector Housing 1. After the contact terminals have been installed on the wi ring harness, the contact terminals can be inserted into the desired location in the connector housing. The terminal cannot be inserted up-side-down. Right side up it slides into place effortlessly. Be sure to push ·the terminal all the way in, until a click can be felt, heard, or seen (through the translucent -housing). 2.
D D 0 0 ~ KING KT 76/78 TRANSPONDER 3. The surface directly beneath the antenna should be a nat plane over as large an area as possible. 4. Where pr·actical, plan the antenna location to keep cable length as short as possible avoiding sharp bends in the cable. However, it is recommended that the separation between DME and transponder antennas be at least six feet. 0 0 5. Maximum separation of ADF sense antenna and transponder antenna is recommended. 0 0 lN SUI.IITOR r;R IMP - ANVIL A I ~, --.
0 0 0 ~ KING KT 76/78 TRANSPONDER r -,/ 12 NGTE 1 I I 0 KT 76/78 I I I I 3 c1 6 A 8 2 4 9 c 1 ALTITUDE B1 DIGITIZER A B 7 A I 1 ~ LIGHT DIMMER ... 3A +-13. 75VDC INPUT~'""'_. (030-1045-12)-(CONN:) (03~-1046-12)(CONTACT) (030~0061-00) 0-~t.-... -•T .0 L __ __j I I I ~ 1 I I B4 c - --, ~ 10 11 5 r <:;ROUND--...... 1 _j L -- ~ " KA 48 ANTENNA '-sEE NOTE #4 1. CONNECTOR 'TERMINAL NUMBER IS SPECIFIED ON THE CONNECTOR. 2. A.LL. WillES SHOULD BE #22AWG. 3.
0 ~ KING KT 76/78 TRANSPONDER 0 0 0 IIWIKING ON COHN£CTOfl HOUSING, 030-IO~O-OO I GAEEN SlOE UP) D n D D (12 .1 9) D 0 0 0 D 0 0 ~ - -- 091-000$-00(~ 089-~911-1212 089-8112-34(2) 089-2016--37(2) 0 4 7- 2445-00 FORM RESISTOR LEADS AS SHOWN 28 V INSTALLATION FIGURE 2-4 KT 76/78 OUTLINE AND MOUNTING DRAWING (Dwg. No. 155-5095-00 R•l) Rev. 1. December.
0 Q r N'c; _ IO
0 D ~ KING KT 76 / 78 n TRA SPONDER D 0 Q D D 0 l ( I I I I I I I I I I I I I lit u L liM I I I I I I I l l I t I . n===it 0 D ~ ~ ~ --.:..._AIRCRAFT SKIN KA48 PIN 071-1048-00 D 0 Q 0 D D FIG URE 2- 5 KA 48 MO . NflNG {Dwg. No. 6 96- 3004 -00 ) Rev. 1.
,...,.,. K'f-<~~8 T RANSPO DER Configuration #1. f ·:>r us ing RG 58 cabl e. is 9 feet. T he maximum cabl e l ength for t his installa tion }("r 0 0 0 7 5/ 78 UG-88/U (030·0005-00) Q Configuration #2. A maximum cable length of 17. 5 f eet. All t he parts necessary for this installation are cont ained in the low loss antenna inst allation kit (050-1253-00), I ·y ~ I KA48 MAX.1 I ) -:1. 1 17.5 D 0 D p3o-o~" -oo 030-0061-00 KPN 024-0013-00 TIMES PART NO.
0 0 ~ KING KT 76/78 TH.A . ~ SPOND E R 0 Trim coax cable oute r insu lation as shov.rn. F o d braid back over ou tcr cover of coax. Do not cross strands. n Solder center conductor to center pin of conductor. Make su re front end of braid (Po i nt of fold ) is even with bottom of connect or. (Shown by arrows) Slide connector cap, with clearanee hole in positi on to c l ear dielectric, on to connector unti.l it snaps in place. D IJ Push braid forward and flatten a g ainst connector cap and solder.
D 0 0 0 ..........,. KING KT 76 / 78 TRA SPONDER CONNECTOR ASSEMBLY INSTRUCTIONS DOCUMENT OCie-1058·00. OCT, lt12 Tr im coax outer i ns ulation a !! s h own. 0 Tr im bra i d b ut no t center c onduct o r or ins ulat.ion back 0.25". D 0 St rip i nsu l ation b a ck 0. 125". Insert cable _through side wall of connector and sol der center c onduct or to center pin of connector. Hea t t h e outs i de of the connect a · sleeve a nd at the same t i we apply solder be tween braid and sleeve.
0 0 ~ KING KT 76/78 THANS PO DEH 0 P l ace nut and gas ke t over cable and cut jacket to d imension shown. 0 0 Comb out b raid and fold out. Cut cable dielectric to dimension shown. Tin cent er conduc tor. P ull bra id wires forward and taper toward c enter conductor. P~ace clamp over braid and pus h b ack agains t cab le jacket. 0 D F old b ack braid wires as shown, trim to proper length (D) and form over clamp as shown. Solder cont act to center conductor.
0 ...........,.. Kl'tn~a D. T RA 0 0 0 -spo DER SECTION Ill OPERATION 3.1 NORMAL OPERATION The tr a nsponder is t u rned on by rotating t h e fu nction sele ctor f rom the off position to any other position. -NOTE- 0 0 0 T he KT 76 / 78 should be turne d off before start ing aircraft enginc (s }. After being turned on there is a 30 second delay before t he unit b ecomes functional. This is to permit the t ransmitter tube t o warm-up and stabil ize.
~ KING KT 76 / 78 T RA NSPONDER -NOTEConsult the airport / fac ility dire c tory section of t he Airmans Information Manual for the location of r a dar beacons. A ir traffi c control radar beacon syst em (AT CRBS) D es c ription : AIM, Section L Radar beacon procedures: AIM, Section II. CODE S t: U ;C T<..lll. 0 0 D 0 0 0 0 0 0 D 0 0 D Page 3-2 F IG UR E 3- 1 KT 76/ 7 8 TRANSP ONDE R CO NT ROLS (Dwg. No. 696 - 300 9 - 00) Rev.
0 0 0 0 0 0 0 0 0 0 INSERTED AS A COURTESY, NOT PART OF THE ORIGINAL MANUAL. Page K-76 Transpondet" KING KT 76/78 Connector 1 12 Circuit Pin# Notes 13.75 VOLT INPUT ....................................................... ........ 5 14 VOLT DIMMER ................................................................ 11 A1 ......................................................................................... 6 1<:2. ......................................................................................
