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King KT76 tso transponder....ambient light sensor adjustment

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skywagon

Joined: 11 Feb 2006
Posts: 184

Posted: Wed Dec 10, 2008 9:22 pm Post subject: King KT76 tso transponder....ambient light sensor adjustment

My KT76 transponder sits on the bottom of my radio stack.  As such, in daylight flights, it's ambient cabin lighting sensor "senses" that it is operating in evening/low light conditions and dims down the transponder radar pulse return lamp such that it can barely be seen in daylight operation.  The sensor is operational as reflecting bright light on it, the pulse flash lamp comes up in brilliance.



I have not been able to find a schematic that shows this lamp control circuit.  I am assuming that that the circuit contains a bias control pot. that when located can be tweaked to allow the pulse return lamp to blink at a higher intensity.



Any help would be greatly appreciated.....

Dave

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