Quote Originally Posted by dc8flightdeck View Post
Tony used a real HSI in his F-4 Phantom sim. Video is here. http://www.youtube.com/watch?v=bS7kWIT3fKo

He used 400Hz AC to power sychro senders that are wired to the HSI synchro receivers. He opened some simkits instruments (Gyro Compass and NAV1) and uses their servos to spin the synchro senders.

The needles are conrolled by pots that are also linked directly to servos.

One major complication with using real instruments is the different approach by each manufacturer to make their intstruments. They may look very much the same on the outside, but often work very different from each other on the inside.
Hello, my name is Gary. I too am building a simpit, Bell 212 helicopter. I have purchased a SPERRY Honeywell HSI that also uses an AC motor that I have operated appling 400Hz tone to an audio amp to achieve 24 VAC and operated my compass ring. In Tony's interface is he able, to say, perform an orbit in either direction and have the compass ring spin continuous?

Gary