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  #11  
Old 12-19-2020, 05:52 AM
vic syracuse vic syracuse is offline
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Quote:
Originally Posted by ssturges View Post
I am using an IFD540, Based on the comments I will look carefully to see if a cable or diplexer issues with the VNA. The cable did meter out with the DMM in the simple check.
I have the Avidyne in my RV-10 with the antenna underneath the tail on the bottom of the fuselage, and have never had any problems with blanking. As mentioned, check your splitter, as well as the coax connections. They can be the culprit as well.

Vic
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  #12  
Old 03-02-2021, 10:06 AM
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craig.roser craig.roser is offline
 
Join Date: Feb 2019
Location: BRADENTON
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The plane is newly mine, an RV8. I have tons of pictures and I have put eyes on every corner that I could including during the prebuy inspection with cowling and inspection plates off.

But I cannot find the diplexer. I see one coax cable coming from the NAV port of the 430W and one from the G/S port. Both of these cables go aft. Then, I can see the coax going to the wing mounted Archer antenna. What I can't see is where the NAV and G/S coax connect to the antenna coax. Where might a builder have put the diplexer?

Unfortunately the builder died a few years ago, not aviation related.
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  #13  
Old 03-02-2021, 11:49 AM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
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Quote:
Originally Posted by craig.roser View Post
The plane is newly mine, an RV8. I have tons of pictures and I have put eyes on every corner that I could including during the prebuy inspection with cowling and inspection plates off.

But I cannot find the diplexer. I see one coax cable coming from the NAV port of the 430W and one from the G/S port. Both of these cables go aft. Then, I can see the coax going to the wing mounted Archer antenna. What I can't see is where the NAV and G/S coax connect to the antenna coax. Where might a builder have put the diplexer?

Unfortunately the builder died a few years ago, not aviation related.
This is odd. Usually the diplexer is close to the radio (why run two coax lines when one will do?). I suspect the original builder had a separate GS antenna somewhere, sort of like 1976 Cessnas that had a small dipole just for GS, up high on the windscreen.
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