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donmorrisey
Joined: 17 Mar 2007
Posts: 18
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 Posted: Fri Jan 01, 2010 5:54 pm Post subject: Issue with Garmin GTX 330 XPDR |
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Hello Listers C
I have just been finishing up my panel and one of the last things in was my transponder a Garmin GTX 330 . Very straightforward to install as I had a wiring harness made for it. Anyway got it in and it powered right up and does a self test etc. I later discovered that each time I activate the Master SWitch C the unit turns itself on C even though I had left it powered off via the "Off" button on the unit. I went back over the wiring and nothing seems amiss???
Any idea why it would be doing this? I have no issues with any of my other avionics that are connected to this wiring harness (SL40 and PMA 4000 Audio Panel).
Thanks. Don...
www.donsbushcaddy.com
Don Morrisey's Skunkworks
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Don...
BushCaddy R120
http://www.donsbushcaddy.com |
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bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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| Posted: Sat Jan 02, 2010 6:52 am Post subject: Issue with Garmin GTX 330 XPDR |
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1/2/2010
Hello Don Morrisey, You wrote: "I later discovered that each time I activate
the Master SWitch the unit turns itself on even though I had left it powered
off via the "Off" button on the unit. I went back over the wiring and
nothing seems amiss??? Any idea why it would be doing this?"
This very topic is currently being discussed on the aeroelectric list. Read
the email exchanges below (last email is first).
Also if you go to this web site, download the GTX327 installation manual and
look at figure B4 on page 47 you will see the pins and notes that are being
discussed.
http://www.velocityxl.com/Downloads/GTX327Transponder_InstallationManual.pdf
OC
===========================================
Allen then wrote:
Actually I meant 327 rather than 337. I looked at the installation manual
pin out diagram and my Approach Systems engineer (Tim Hass) has pin 1 and
pin 15 jumpered. The drawing calls pin 1 "Avionics Master on which may be
the pin that I could unhook from power and make it work like we want.
I emailed Tim Hass at Approach Systems to ask for clarification on this
issue. I'll let you know what I find out.
Allen
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