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nuckolls.bob(at)aeroelect
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 Posted: Fri Jul 17, 2020 1:39 pm Post subject: antenna analyzer? |
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| Quote: | attaching photo of my NAV/ILS antenna. Used RG174 to feed.
Merle
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KC1DNJ
General Radiotelephone
Commercial SEL
A&P
Building scale P51, rebuilding Tailwind W10
Read this topic online here:
Attachments:
http://forums.matronics.com//files/nav_ils_632.jpg
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I note that the UHF elements (glide slope)
appear much shorter than the expected 33%
or so of a VOR/LOC antenna. Do you think
proximity to structure de-tuned your antenna
downward in frequency?
As a practical matter, a barefooted VOR/LOC
antenna works fine on GS too. They are harmonically
related and LOC/GS signals off the approach
end of the runway are HUGE . . . but it
would be interesting to see the VNA sweeps
of the as-installed antenna. Thanks for
sharing the picture!
Bob . . .
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merlewagner2
Joined: 01 Jun 2016
Posts: 18
Location: Spring Hill, FL
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| Posted: Sat Jul 18, 2020 9:04 am Post subject: Re: antenna analyzer? |
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Bob,
Just took a couple photos of my antenna. I did two calibrations, one for Glide slope and one for Localizer.
Not sure how the photos will come out. These are attached.
I don't remember the length I initially used for antenna. I bench tested and it looked OK. After install the freqs changed, most likely due to frame proximity. There are some wire and and ferrites between the connector and the foil. This will take up some length. I had to cut the foil to get in the freq range.
Merle
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_________________
KC1DNJ
General Radiotelephone
Commercial SEL
A & P
Building scale P51, rebuilding Tailwind W10 |
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