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Transponder King KX76a

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reichec

Joined: 23 Apr 2007
Posts: 26

Posted: Sun Dec 02, 2007 7:12 am Post subject: Transponder King KX76a

If you hook it up to your power source (bus, with a 1A fuse holder just to 

protect it) make sure that the kt76 is wired for 14v lighting.  I know that 

these units run off 14V and work through a dropping resistor when I install 

them in 28v airplanes, but I beleive that the lighting circuit can run on 

either depending where you put grounds. Or you could configure it for 28V 

lights and it would them be half bright all the time.  Im not sure.  Maybe 

some fiddling with a multi-pole switch that could be configured to brighten 

or dim the backlighting inside the unit.  Having it light up when you turn 

on the unit cant really be done(if you mean the OFF/STBY/ON/ALT 

switch)...... well just have the lighting power come after the avionics 

master or whatever.... just some ideas.



Charles

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Mike Hoffman

Joined: 11 Mar 2006
Posts: 54

Posted: Mon Dec 03, 2007 1:30 am Post subject: Re: Transponder King KT76a

Thanks Charles,



Not quite what I'm looking for. I don't care if it doesn't have a dimmer feature. I just want it to light up when I turn it on.



On my Icom A200 I was able to connect the panel light dimmer wire to a powered terminal (out of the back of the terminal plug and looped back in to a + terminal) and get the lights to turn on when I powered the radio up. I'm quite sure I can do the same with my transponder but need assistance with the pin out.



Thank you for your reply.



Mike Hoffman

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Last edited by Mike Hoffman on Tue Dec 04, 2007 5:07 pm; edited 1 time in total

idewhirst(at)indtechnolog
Guest

Posted: Mon Dec 03, 2007 8:41 am Post subject: Transponder King KX76a

You can find a pinout diagram here



http://www.aeroelectric.com/Installation_Data/KT76A-76C-78A.pdf



Not sure that will help however, as there is no switched output on a KT

series transponder, the encoder is always on.



-- Ian 



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gyoung

Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas

Posted: Mon Dec 03, 2007 11:14 am Post subject: Transponder King KX76a

He didn't say anything about the encoder, just the lighting. From the

pinout, for 14 volts put power to pin 2 and ground to pin 3 to get full

bright. Use a dimmer on the power if desired.



Regards,

Greg Young

 



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idewhirst(at)indtechnolog
Guest

Posted: Mon Dec 03, 2007 1:00 pm Post subject: Transponder King KX76a

I believe the gentleman wants the transponder to light up when he turns on

the transponder, not the master switch.  The reference to the encoder is

that some transponders switch the encoder power, unfortunately not the King.

Earlier Mike Hoffman wrote:



"On my Icom A200 I was able to connect the panel light dimmer wire to a

powered terminal (out of the back of the terminal plug and looped back in to

a + terminal) and get the lights to turn on when I powered the radio up. I'm

quite sure I can do the same with my transponder but need assistance with

the pin out."



Cheers -- Ian



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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Dec 03, 2007 3:11 pm Post subject: Transponder King KX76a

How about putting power in to pin 2 and looping pin 3 to pin 12??  You may

have to put a resistor across 2-3 to allow enough current to operate the

XPNDR.



Just thinking...  



You could also wire the lights in parallel with the transponder (or form pin

12) and just pull the breaker to turn off the transponder.  That way when

you turn on the breaker, the lights will also come on.



Noel



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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Mike Hoffman

Joined: 11 Mar 2006
Posts: 54

Posted: Tue Dec 04, 2007 4:14 am Post subject: Re: Transponder King KX76a

Thanks to every one that replied.  



You are correct in what I am looking to do. I would like the panel lights for the transponder to turn on when I turn on the switch that turns on the transponder. I guess I was looking for a switched output that may not exist (that would be to easy wouldn't it).



I will get busy with my meter and a probe and see if I any of the suggestions Will work.



Thank you 

Mike Hoffman

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