Today's Message Index:
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1. 06:16 AM - DIY VOR/ILS diplexer? (Charlie England)
2. 06:49 AM - Re: DIY VOR/ILS diplexer? (Eric Page)
3. 07:14 AM - Re: DIY VOR/ILS diplexer? (Eric Page)
4. 07:35 AM - Re: DIY VOR/ILS diplexer? (Eric Page)
5. 08:41 AM - Re: Re: DIY VOR/ILS diplexer? (Robert L. Nuckolls, III)
6. 10:13 AM - Re: DIY VOR/ILS diplexer? (user9253)
7. 12:13 PM - Re: Re: DIY VOR/ILS diplexer? (Charlie England)
8. 12:43 PM - Re: DIY VOR/ILS diplexer? (Eric Page)
9. 01:01 PM - Re: DIY VOR/ILS diplexer? (Eric Page)
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| Subject: | DIY VOR/ILS diplexer? |
Good morning,
A friend needs to install either an ILS antenna, or acquire a diplexer to
split his existing VOR antenna signal to feed both the VOR and ILS inputs
on his Garmin 530. A diplexer would obviously be lighter & easier to
install, but off-the-shelf models tend to cost more than an antenna. I
thought that the Aeroelectric site had a circuit diagram for rolling your
own diplexer, but I haven't been able to find it. Can anyone help with this?
Thanks,
Charlie
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| Subject: | Re: DIY VOR/ILS diplexer? |
Here's a program that will design the filter elements for a diplexer...
http://www.tonnesoftware.com/elsie.html
...and here's a video by Alan Wolke (W2AEW) explaining diplexers and demonstrating
one that he built.
https://www.youtube.com/watch?v=wv79DSqVi9w
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505209#505209
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| Subject: | Re: DIY VOR/ILS diplexer? |
Or, if you don't mind laying out your own board, Mini-Circuits sells pre-made band-pass
filter elements that are specifically designed for the VOR/ILS and GS
frequency bands:
https://tinyurl.com/mtp67ycw+
https://tinyurl.com/yc2zt4d8+
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505210#505210
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| Subject: | Re: DIY VOR/ILS diplexer? |
Someone with more knowledge of RF wizardry could tell us whether this would work,
but another possibility occurs to me. Put a simple tee splitter on the antenna
feedline, then in-line low pass and high pass filters feeding the VOR/LOC
and GS receivers, respectively. You would need some adapters to accommodate
the filters' SMA connectors.
https://www.digikey.com/short/vf3vrnwj
https://www.digikey.com/short/hm2t9wtd
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505212#505212
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| Subject: | Re: DIY VOR/ILS diplexer? |
At 09:14 AM 12/10/2021, you wrote:
>
>Or, if you don't mind laying out your own board, Mini-Circuits sells
>pre-made band-pass filter elements that are specifically designed
>for the VOR/ILS and GS frequency bands:
>
>https://tinyurl.com/mtp67ycw
>
>https://tinyurl.com/yc2zt4d8
>
You need to remove the + signs from those
links for them to work. Those would
take all the uncertainty and post fabrication
verification concerns. I've built those from
discrete components but had access to test
equipment to make sure they were working
as desired.
But then, these are experimental airplanes where
you can do in-flight performance checks to see
if your own design goals are met. Some pretty
'soft' antenna systems have been found adequate
to task.
On the other side of the coin, what's your
labor worth? There are numerous offers on
eBay for about the same price as the Mini-Circuits
devices . . . they're all packaged up
and ready to go.
https://tinyurl.com/yckhtnet
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 6
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| Subject: | Re: DIY VOR/ILS diplexer? |
Jim Weir has written articles about splitting an ILS signal from a VOR antenna.
https://www.kitplanes.com/tall-transmission-tales/
Note that his diagram shows an inductor but the text explains that a 10-picofarad
capacitor with straight leads has enough inductance without a separate coil.
Below by Bob posted years ago:
Actually, you can fabricate a nifty antenna just from coax cable. In this case,
you clean off the outer jacket of your feedline about 11". If it's a double shielded
coax, strip of the outer layer of shield too. Pull center conductor out
of the remaining shield as illustrated here:
http://www.aeroelectric.com/articles/shldwire/shldwire.html Stretch the center conductor and remaining braid out into a dipole and trim each to 8.5" per side. Glue to 1/4" wood or plastic dowel 17" long. Just spot it in a few places to fixture it on the dowel. Then put pieces of heat shrink over each leg of the dipole to "dress it up". This technique eliminates the process-sensitive and never pretty junction between antenna elements and the feedline. It's all one piece. Bob
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505218#505218
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| Subject: | Re: DIY VOR/ILS diplexer? |
Thanks for the ideas. Ebay is certainly the best option, but I've passed
on the various possibilities to my friend.
Charlie
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Message 8
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| Subject: | Re: DIY VOR/ILS diplexer? |
nuckolls.bob(at)aeroelect wrote:
> You need to remove the + signs from those links for them to work.
The + sign is a documented feature of the TinyURL service. It causes their server
to display a preview screen where the user can see the URL hes being taken
to, before actually going there. Its intended as a safety measure, to reassure
users that theyre not being sent to a malicious website by an obfuscated hyperlink.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505222#505222
Message 9
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| Subject: | Re: DIY VOR/ILS diplexer? |
user9253 wrote:
> Jim Weir has written articles about splitting an ILS signal from a VOR antenna.
I knew I had seen that recently! Kitplanes republished that idea in the Dec 2021
issue, and Jim showed it built as a stand-alone device. That part of the article
begins at the bottom of page 2 in the attached PDF.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505223#505223
Attachments:
http://forums.matronics.com//files/potpourri_153.pdf
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