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12-09-2011, 06:48 PM
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Join Date: Sep 2007
Location: Dike Iowa
Posts: 117
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76A install question
I just installed a kt76a I got off eBay with a high serial number(126394).
I wired it with 14v power to both pin 11 and 12 in case I ever wanted to use a 76c.
The transponder works OK except the reply light flashes like normal even if the power switch is off. Should I have left pin 12 open?
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9A flying
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12-09-2011, 08:01 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,705
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Pin 12 should not be hooked up for the KT76A
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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12-09-2011, 08:28 PM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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To finish the story on my xponder failure. I ended up going to Stein for an all digital replacement. It should arrive early next week.
I decided that my future with ADS-B is not with Mode S but with a stand alone UAT instead because i want FIS-B weather so I decided on the Garmin 327.
Now a couple hours upside down under the panel!!!
Last edited by Brantel : 12-09-2011 at 08:47 PM.
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12-10-2011, 06:35 AM
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Join Date: Sep 2007
Location: Dike Iowa
Posts: 117
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Thanks Walt. If I leave pin 12 open is it still a slide-in replacement for a 76c?
Will it hurt anything to leave it hooked up?
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9A flying
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12-10-2011, 07:15 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,705
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I had to go to the schematic to find pin 12 on the KT76A, its a maintenance test point for 13.75v (out), by hooking it to power you are supplying 13v (in) and bypassing the on/off switch, so the xpdr will be on all the time 
Even though its not listed in the install guide pin 12 could be used for switched 13v out for encoder power.
The KT76C receives power on pin 11 and 12 (tied together), so the C model will work just fine with 12 not connected.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Last edited by Walt : 12-10-2011 at 07:18 AM.
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12-10-2011, 02:03 PM
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Join Date: Sep 2007
Location: Dike Iowa
Posts: 117
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OK. Thanks Walt
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9A flying
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03-27-2020, 02:54 PM
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Join Date: Dec 2010
Location: Floyds Knobs, IN
Posts: 638
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ATC reports my 4-digit mode 3A is alternating between two codes, the set 1200 and another in the 2000s that was not consistent.
36 inch coax to a stick and ball antenna is located forward right cockpit floor. Same faults toward and away from the ATC radar site location.
Was not in close formation/single ship and it was not 1200 and then 2400. Spun all 4 knobs around a few times during a recycle.
No change.
Recent cert and bench check history, no issues.
Thoughts?
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RV-6, bought from builder.
O-320, slider, carb, mags, FP
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03-27-2020, 04:25 PM
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Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,218
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Sounds like an Encoder problem.
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Noel
RV-6A N6NF
tip-up
flying
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03-27-2020, 04:36 PM
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Join Date: Jun 2012
Location: Frederick, MD
Posts: 823
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Quote:
Originally Posted by noelf
Sounds like an Encoder problem.
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Agree if you are talking about the ones attached to the knobs and not the altitude encoder.
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Dan Morris
Frederick, MD
PA28-140
Hph 304CZ
RV6 built and sold
N199EC RV6A flying
Learn the facts. "Democracy dies in darkness"
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03-27-2020, 05:51 PM
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Join Date: Dec 2010
Location: Floyds Knobs, IN
Posts: 638
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Any way debris moved somwhere causing the issue that can be removed with contact cleaner?
Is this easy for a tech to find/repair on the bench?
__________________
RV-6, bought from builder.
O-320, slider, carb, mags, FP
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