Introduction

The aim is to produce a hardware simulation of the Bendix/King KT 76C TSO Transponder and KN 62A DME.

 

Front Panel Design

In order to reduce cost and simplify construction and mounting, both units are to be built using a single front panel. The panel was designed using Front Panel Designer and fabricated by Schaeffer AG in Germany.

 

Two red translucent windows were fabricated to both hide the 7 segment displays and also provide the various information legends.

The back of the front panel was recessed to mount the windows.

 

Windows mounted to rear of front panel

 

Front view, legends will be backlit using square red LEDs.

 

Electronics

The electronics interface to Microsoft Flight Simulator will use various Opencockpits interface cards:

Mastercard	Used to provide interface to switches, LEDs, Display II card and Encoder II card
Display II Card	Used to interface to 7 segment displays
Encoder card	Used to interface to ELMA E37 concentric rotary encoder
2 * three 7 segment displays cards	Used to mount three 7 segment displays
Six 7 segment displays card	Used to mount five 7 segment displays
Four 7 segment displays card	Used to mount four 7 segment displays

Display II card and mounted 7 segment displays.

Matercard and Encoder II card.

The displays, LEDs, push button switches, rotary switch, slide switches and rotary encoder are mounted on veroboard.

The assembly is attached to the back of the front panel using 6mm high pillars screwed into the reverse side of the front panel.

The Almost Finished Unit