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Blind Encoder Power Connection to Garmin GTX-327 Transpond

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rjquillin

Joined: 13 May 2007
Posts: 123
Location: KSEE

Posted: Sat Aug 25, 2007 4:22 pm Post subject: Blind Encoder Power Connection to Garmin GTX-327 Transpond

At 13:12 8/25/2007, you wrote:

 	  Quote: 	
		  Anyone have a blind altitude encoder (like an AK-350) that is 

getting it's power from pin 14 (switched power output) on a Garmin 

GTX327 transponder?


	


Yes



 	  Quote: 	
		  I notice that the schematic for the Garmin says that pin is good for 

1.5A max. The encoder document says it draws .60 amp for 1 min during warm-up.


	


OK, no problem there.  0.6A is far less than 1.5A



 	  Quote: 	
		  This seems to me to be OK, but what puzzles me is that the page in 

the encoder that lists connections for the 320/327 has pin 15 (main 

power for the 327) listed for power.


	


Yes, that is the supply to the 327, and anything else powered from 

pin 14 as well.

Your encoder document shows connections to/from the 327?

Either pin could be used, but should you need/want encoder output 

(perhaps for a GPS/LORAN) while the transponder was off, pin 14 would 

not be a good choice for encoder power.



 	  Quote: 	
		  What have you guys used for powering up the blind encoder??



Thanks,



Dave

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