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phd1993
Joined: 04 Apr 2006
Posts: 18
Location: Overland Park, KS
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 Posted: Wed Nov 15, 2006 8:17 pm Post subject: Installation of Garmin GTX327 transponder |
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Trying to install GTX327 in my 701 - when I power-up the transponder all I get is the background illuminated with no other text or indications. I do not have either the altitude encoder (Ameri-King 350) or antenna connected. Should I expect to see something more displayed upon power-up? Power-up while holding FUNC button?
Thanks,
Sam H.
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craig(at)craigandjean.com
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| Posted: Wed Nov 15, 2006 9:39 pm Post subject: Installation of Garmin GTX327 transponder |
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I assume you have the installation manual. If not I can e-mail it to you.
Looking at the pin-out of the DB25 connector I see power being fed in to pin
15. But I also see pin 1 labeled as "Avionics Master On". Is it possible
that the unit won't power on unless it sees 12 volts on pin 1? Likewise what
do you have connected to pin 16 (external standby) or pin 22 (airborn sense
- squat switch). Some of these may inhibit the unit.
Also are you grounding both pins 13 and 25? Shouldn't matter but probably
the best practice. It would spread current across two pins instead of one.
You may get more answers on the aeroelectric list.
BTW: although a transponder won't transmit until it is interrogated and I
don't see any specific warnings in the manual I still wouldn't operate a
transmitter with out the proper antenna load connected. This is one
expensive box.
-- Craig
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secatur
Joined: 02 Nov 2006
Posts: 50
Location: New Zealand
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| Posted: Thu Nov 16, 2006 12:58 am Post subject: Re: Installation of Garmin GTX327 transponder |
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NEVER,EVER, UNDER ANY CIRCUMSTANCES...operate any Transmitter without antenna (or at least dummy load) attached....unless you got lotsa spare $$$$$
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