Glide slope not working

[scott poms]

Glide slope will not come into view on my HSI.  No flag, lateral guidance is fine, just redid the interior and fresh annual.   Anyone know where that diplexer / splitter resides? Hoe coax routes when it leaves tail?  Maybe something got unplugged? Coincidence just did all the interior? 

Thanks for any help 

[Tony Armour]

An avionics shop will have a portable transmitter and can test the HSI in like two minutes. That may not help your situation other than if you have a radio problem but it sure is quick and probably free if they typically do work for you.

[Marauder]

On November 1, 2015 at 10:53:04 AM, scott poms said:

Glide slope will not come into view on my HSI.  No flag, lateral guidance is fine, just redid the interior and fresh annual.   Anyone know where that diplexer / splitter resides? Hoe coax routes when it leaves tail?  Maybe something got unplugged? Coincidence just did all the interior? 

Thanks for any help 

The coaxial cables normally are run from the antenna on the vertical stabilizer through the side walls. Mine are on the pilot side. I have heard stories of installers screwing through cables. What you are describing sounds more like a problem with the glide slope  circuitry in the glide slope receiver or the radio itself. The HSI could also be the issue. 

[takair]

What radio do you have tied to it?  Garmin will send a test offset on start-up even if the antenna/coax bad.  would help narrow the issue.

[mitch0537]

I believe that on a K, the Glideslope antenna is in the cockpit attached to the tube that runs up the middle of the windscreen and goes through the glare shield. Look high on this bar to see a small box maybe 1"x 2" with "whiskers" sticking out of it. That is the GS antenna. If someone removed it and installed a splitter, the Coax runs on the Co-pilot side to the nav antenna.

[Guitarmaster]

Sounds like a GS receiver failure. Is it on all freqs or just a couple?

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