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  #1  
Old 05-14-2022, 06:28 AM
BH1166 BH1166 is offline
 
Join Date: Nov 2017
Location: Eatonton Georgia
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Default Transponder power up ON

Moving from stone age to digital age. Replaced King 76a for a new Garmin GTX 327. Using existing wiring for Power, same circuit breaker. I’d like the Garmin to power ON like the King did when Avionics Master is flipped. As of now, I have to press a button (on, ALT, etc) for the Garmin to come on. I have a pin AVIONICS MASTER, but am unsure where/ how to wire. Is this needed to get the GTX to power up when Avionics Master is flipped. The breaker/power is ON/ available when Avionics Master is on, but unit itself does not come on.
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Last edited by BH1166 : 05-14-2022 at 07:33 AM.
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  #2  
Old 05-14-2022, 07:08 AM
lr172 lr172 is offline
 
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It would be my assumption that applying 12VDC (likely wired from the avionics master switch) to the avionics master pin would force the unit to turn on. However, I have never installed one. If the 12V source is already from the avionics master switch, you can just bridge the pins.
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  #3  
Old 05-14-2022, 07:22 AM
BH1166 BH1166 is offline
 
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Thanks Larry, the 12VDC is coming directly from the circuit breaker. Im weak in knowledge concerning electronics/electrical things. So I think you are saying ďtie the Avionics Master pin to the power that Iím
using (from CB)ď , in essence, two power pins ?

Thanks
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  #4  
Old 05-14-2022, 07:22 AM
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Longez Longez is offline
 
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Quote:
Originally Posted by BH1166 View Post
Moving from stone age to digital age. Replaced King 76a for a new Garmin GTX 327. Using existing wiring for Power, same circuit breaker. Iíd like the Garmin to power ON like the King did when Avionics Master is flipped. As of now, I have to press a button (on, ALT, etc) for the Garmin to come on. I have a pin AVIONICS MASTER, but am unsure where/ how to wire. Is this needed to get the GTX to power up when Avionics Master is flipped. The breaker/power is ON/ available when Avionics Master is on, but unit itself does not com on.
Butch,

Yes, if you wire power to the GTX 327 like shown here, the GTX 327 will power up when power is applied without having to press a button.

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Steve
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  #5  
Old 05-14-2022, 07:27 AM
BH1166 BH1166 is offline
 
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Quote:
Originally Posted by Longez View Post
Butch,

Yes, if you wire power to the GTX 327 like shown here, the GTX 327 will power up when power is applied without having to press a button.

Attachment 25806

Steve
Thanks SteveÖ, seems simple enough, cut, twist POWER and AVIONICS MASTER together, then to power from CB, solder, shrink tube, test !
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  #6  
Old 05-14-2022, 10:12 AM
BH1166 BH1166 is offline
 
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Default Yeah

All is good now! Thanks again Larry and Steve
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Last edited by BH1166 : 05-15-2022 at 05:14 AM.
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  #7  
Old 05-14-2022, 11:21 PM
BobTurner BobTurner is offline
 
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Since the FAA requests all transponders to run in ALT mode all the time, thatís how it should be programmed to boot up. Itís in the manual.
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  #8  
Old 05-15-2022, 07:26 AM
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catmandu catmandu is offline
 
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Is there a reason to send power to both? Does not solely applying power to Pin 1 Avionics Master accomplish the same thing?
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  #9  
Old 05-15-2022, 07:10 PM
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Default Avionics Master On

Wiring power to pin 15 provides ship power to run the transponder. You are able to power the unit on/off using the buttons of the front of the unit. By wiring 12v to pin 1, the unit will automatically power on when voltage is sensed on the pin.

Thanks,

Justin
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  #10  
Old 05-16-2022, 04:33 AM
BH1166 BH1166 is offline
 
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Quote:
Originally Posted by BobTurner View Post
Since the FAA requests all transponders to run in ALT mode all the time, thatís how it should be programmed to boot up. Itís in the manual.
I see a setting for boot up mode, where upon a change in altitude, the unit goes from STBY to ALT . Set to NO, you have to manually change/press ALT button. I didnít find a setting where it boots to ALT.
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