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reichec
Joined: 23 Apr 2007 Posts: 26
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Posted: Sun Dec 02, 2007 7:12 am Post subject: Transponder King KX76a |
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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
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Posted: Mon Dec 03, 2007 1:30 am Post subject: Re: Transponder King KT76a |
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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 |
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idewhirst(at)indtechnolog Guest
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Posted: Mon Dec 03, 2007 8:41 am Post subject: Transponder King KX76a |
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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
![](images/avatars/984895192636c1e818971f.jpg)
Joined: 09 Jan 2006 Posts: 211 Location: Republic of Texas
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Posted: Mon Dec 03, 2007 11:14 am Post subject: Transponder King KX76a |
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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
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Posted: Mon Dec 03, 2007 1:00 pm Post subject: Transponder King KX76a |
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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
![](images/avatars/6347796944bf72a583fa4.jpg)
Joined: 19 Jul 2006 Posts: 2704 Location: Campbellton, Newfoundland
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Posted: Mon Dec 03, 2007 3:11 pm Post subject: Transponder King KX76a |
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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 |
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Mike Hoffman
Joined: 11 Mar 2006 Posts: 54
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Posted: Tue Dec 04, 2007 4:14 am Post subject: Re: Transponder King KX76a |
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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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