I'm not sure about the garmin 430, but I wouldn't be surprised. I have an
Sl30 and GNS 480, both of which have the diplexer internal.

One way to tell is to check the installation documentation to see if there
is a single antenna connection, or a separate GS antenna input.

Paul

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Marvin Kaye
Sent: Monday, November 27, 2006 8:59 AM
To: lml
Subject: [LML] Re: Nav antennas

Posted for "Chatfield S. Daniel" <csdaniel@FNBSouth.com>:

  Paul,
  Does the Garmin 430 have an internal diplexer?
  Chat Daniel

""
   Did you use a dilexer or a power splitter to tie the two SL30s to the
   antenna? A diplexer seperates the GS and VOR band signals. The SL30
  has an
   internal diplexer, which is why there is a single antenna input. If
  you use
   an external diplexer and connect the "VOR" output to the SL30 antenna
  input
   you are starving one SL30 for GS signals and the other for VOR
  signals. All
   that is getting through is what leaks past the diplexer, probably
  15-20 dB
   down from the signal the antenna is capturing. A simple VHF/UHF power
   splitter should be used rather than a diplexer.
""

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