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05-16-2013, 09:27 AM
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Join Date: Nov 2006
Location: Tampa, Florida (KVDF)
Posts: 491
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Transponder connector orientation from diagram question
Hello all today I'm wiring up my King KT-78A transponder to the AK350 encoder. My question is I have the wiring diagram but I'm not 100% sure how to deciphur the orientation of the connector with regards to the rear of the transponder and rear of the encoder. From the attached diagram am I looking at the wire side or the metal connector side of the harness?
thanks
Bill
__________________
RV6A flying as of November 8, 2016. N717WK
Finishing a RV10
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05-16-2013, 09:31 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Looks to be the side the wires go into.
Get a magnifying glass, and look at the back of the connector, you should see the identifying numbers and letters for the pins.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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05-16-2013, 09:34 AM
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Join Date: Nov 2006
Location: Tampa, Florida (KVDF)
Posts: 491
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Quote:
Originally Posted by Mike S
Looks to be the side the wires go into.
Get a magnifying glass, and look at the back of the connector, you should see the identifying numbers and letters for the pins.
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Hi Mike thanks for the instantaneous response time  . Unfortunately I don't have the factory connector, I'm having to purchase my own from digikey.
Bill
__________________
RV6A flying as of November 8, 2016. N717WK
Finishing a RV10
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05-16-2013, 09:36 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Strictly a guess here, but I strongly suspect the Digikey unit will be marked the same.
Give Stein a call if he doesnt jump in on this thread.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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05-16-2013, 09:38 AM
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Join Date: Nov 2006
Location: Tampa, Florida (KVDF)
Posts: 491
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Will do Mike, thanks for the advice.
Bill
__________________
RV6A flying as of November 8, 2016. N717WK
Finishing a RV10
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05-16-2013, 10:18 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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The Installation Manual
http://www.neboservice.ru/docs/0897493001195543990.pdf
says that the view you show is the "front side" of the connector, so it's the side the circuit board plugs into.
Look at the edge connector on the ciruit board, often pin 1 has some sort of identifying reference mark etched into the copper traces.
If not, the fact that pins 1 and A at one end of the connector are ground might help identify that orientation by the amount of copper on the circuit board.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Last edited by az_gila : 05-16-2013 at 10:21 AM.
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05-16-2013, 10:52 AM
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Join Date: Nov 2006
Location: Tampa, Florida (KVDF)
Posts: 491
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Quote:
Originally Posted by az_gila
The Installation Manual
http://www.neboservice.ru/docs/0897493001195543990.pdf
says that the view you show is the "front side" of the connector, so it's the side the circuit board plugs into.
Look at the edge connector on the ciruit board, often pin 1 has some sort of identifying reference mark etched into the copper traces.
If not, the fact that pins 1 and A at one end of the connector are ground might help identify that orientation by the amount of copper on the circuit board. |
Hello Gil thanks for the response. I checked the circuit board and didn't see any indicators. The transponder I'm wiring is the KT-78a. The manual you posted was for the KT-78C. Are they wired the same way?
thanks,
Bill
__________________
RV6A flying as of November 8, 2016. N717WK
Finishing a RV10
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05-16-2013, 12:10 PM
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Join Date: Feb 2005
Location: Minneapolis
Posts: 2,471
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ON the unit itself, "1" is on the upper left, and "A" is on the lower left (similar to the KT-76A/C). If you drop me an email offline I can send you the correct manual for the 78.
Cheers,
Stein
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05-16-2013, 12:22 PM
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Join Date: Nov 2006
Location: Tampa, Florida (KVDF)
Posts: 491
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Quote:
Originally Posted by SteinAir
ON the unit itself, "1" is on the upper left, and "A" is on the lower left (similar to the KT-76A/C). If you drop me an email offline I can send you the correct manual for the 78.
Cheers,
Stein
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Thanks Stein, email sent.
best regards,
Bill
__________________
RV6A flying as of November 8, 2016. N717WK
Finishing a RV10
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05-16-2013, 03:28 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by SteinAir
ON the unit itself, "1" is on the upper left, and "A" is on the lower left (similar to the KT-76A/C). If you drop me an email offline I can send you the correct manual for the 78.
Cheers,
Stein
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That says the the connector view (the pic you posted) is looking at the front side of the connector as stated in the manual...
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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