Kt 70 Installation Manual ((better)) [OFFICIAL]

If the aircraft features a DME or a second transponder, connect Pin 35 to the mutual suppression bus. This prevents the KT 70 from transmitting while other RF equipment is pulsing, protecting the receiver front-end from damage. 4. Antenna Installation and Coaxial Routing

The antenna requires a metallic ground plane. On composite or wood aircraft, you must install a fabrication sheet of aluminum (minimum 12x12 inches) inside the fuselage skin to act as a ground plane. RF Cable Specifications

: Mutual Suppression Pulse (links to DME or other transponders to prevent simultaneous transmission). Wire Specifications

: Technicians utilize dedicated test sets (such as an IFR6000 or similar ramp analyzer) to query the transponder's Mode A framing, Mode C pulse intervals, and Mode S discrete address identity.

The KT 70 uses a dual-connector configuration on its rear backplate: a primary D-subminiature connector for power, data, and ground, and a blind-mate coaxial connector for the RF antenna. Main D-Sub Connector Pinout (Partial Map) Pin Number Function Name Description Aircraft Power (+AIRCRAFT) Main DC input (14V or 28V) 2 Aircraft Power (+AIRCRAFT) Parallel power pin for current distribution 3 Power Ground (GND) Main chassis and system ground 4 Power Ground (GND) Parallel ground pin 5 Cavity Switched Output Supplies power to external switch legs 10 Gillham Code A1 Altitude Encoder Input Bit A1 11 Gillham Code A2 Altitude Encoder Input Bit A2 12 Gillham Code A4 Altitude Encoder Input Bit A4 13 Gillham Code B1 Altitude Encoder Input Bit B1 14 Gillham Code B2 Altitude Encoder Input Bit B2 15 Gillham Code B4 Altitude Encoder Input Bit B4 16 Gillham Code C1 Altitude Encoder Input Bit C1 17 Gillham Code C2 Altitude Encoder Input Bit C2 18 Gillham Code C4 Altitude Encoder Input Bit C4 19 Gillham Code D4 Altitude Encoder Input Bit D4 24 Audio Output Audio alert connection to intercom 35 External Suppress In/Out Mutual suppression pulse line Wiring Instructions Kt 70 Installation Manual

Mount the antenna on the bottom of the fuselage. Keep it at least 3 feet away from ADF loops, DME antennas, and the VHF COM antennas to minimize signal shadowing and interference. 5. Post-Installation Configuration and Checkout

Some installations utilize serial data for cleaner wiring.

Use RG-58C/U or similar high-quality shielded coaxial cable to connect the antenna to the transponder. 5. Post-Installation Configuration and Testing Once installed, the system must be configured and tested.

Connects via a standard 10-wire Gillham code interface. If the aircraft features a DME or a

Use RG-58 or RG-142 coaxial cable to minimize signal loss.

The Bendix/King KT 70 is a TSO’d Mode S transponder designed to provide reliable altitude and surveillance reporting for aircraft. While older than current-generation touchscreen transponders, it remains a robust piece of avionics found in many general aviation panels.

If you are a hobbyist or a machinist, your "Kt 70" is most likely the . This is a precision tool used for coordinate drilling and small milling operations on a benchtop drill press or milling machine.

Shield all data lines to prevent radio frequency interference (RFI). 5. Antenna Installation : TSO C112 Class 1A

Whether you are doing a or upgrading from a KT 76A/76C

Place it at least 3 feet away from the ADF sense antenna, 6 feet away from the DME antenna, and clear of landing gear doors or exhaust paths.

: TSO C112 Class 1A, suitable for use up to 50,000 feet . Installation Procedures