ILS Glide Slope is alive but no change

[Mack55]

Just shot my first ILS approach in my newly finished RV7. Or i tried…. And yes I checked notams and nothing was stated about vertical guidance being out.

Setup:
Dual Skyview touch 10” EFIS
Advanced Control Module with built in ARINC
Garmin 430w
Bob archer NAV antenna left wing

VOR navigation is working
ILS lateral guidance working
Glide Slope activated on the approach but the needle never changed and just stayed centered.

I plan to verify the following tomorrow but looking for any other suggestions

430 self test on boot up and verify vertical guidance to dynons

Check GS on the 430 when doing the same approach

Any other suggestions?

Thanks in advance

 

[GKC Aviation]

I'll preface by saying I haven't had anything to do with the Bob Archer antennas.
The paperwork says they are a VOR antenna, horizontally polarized.

Assume that your coax from the nav antenna goes to a diplexer (not a splitter) to separate the NAV and GS into the two BNC inputs on the GNS430?

The self test on the GNS430 just tell you if your indicator is working, but it's a good place to start fault finding. On self test, as you know, you should get half left/half up indication.

 

[RVDan]

The Archer antenna is tuned for VOR/ Loc. it so happens that glideslope is a multiple of the LOC and the antenna receives it fine. This is what I have in my airplane connected to an SL30. The GNS430 has separate inputs for GS and VOR/LOC. You will need a splitter to connect to the GS input.

 

[swatson999]

The Archer antenna is tuned for VOR/ Loc. it so happens that glideslope is a multiple of the LOC and the antenna receives it fine. This is what I have in my airplane connected to an SL30. The GNS430 has separate inputs for GS and VOR/LOC. You will need a splitter to connect to the GS input.

Diplexer, NOT a simple splitter.

 

[airguy]

Diplexer, NOT a simple splitter.

Yep, diplexer - there is a difference.

 

[Mack55]

Thanks all. I bought a diplexer and plan to install this week.