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andymeyer
Joined: 31 Mar 2015
Posts: 54
Location: SW MI
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 Posted: Thu Oct 01, 2020 5:48 am Post subject: ADS-B and Transponder antenna design... |
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So, all this chatter about the ELT antennas got me thinking about the ADS-B antenna I made. I dove into the math, made some estimates, and designed two on Upverter and had parts made. I got luck in that my SlimJim ADS-B antenna has picked up airborne traffic over 100 miles away connected to a Stratux (I have both SDR radios tied into a single antenna - criminal - I know, but it works and it's small and light.)
Attached are the layouts of the two antennas and links to the actual designs on Upverter.
I had 5 of each made. Anyone interested in testing and sharing data - maybe make this a shared design as well. Cost is just a few bucks.
Slim Jim: https://upverter.com/eda/#tool=pcb,designId=1d1c59be761e9901
DiPole: https://upverter.com/eda/#tool=pcb,designId=9eb3fbd043861e96
(Upverter is a pretty awesome cloud based schematic and layout tool that allows collaboration on designs, etc... Think Google Docs for circuit design.)
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andymeyer
Joined: 31 Mar 2015
Posts: 54
Location: SW MI
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| Posted: Fri Oct 02, 2020 1:11 pm Post subject: Re: ADS-B and Transponder antenna design... |
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And I'm willing to send a pair of antennas to someone who's willing to analyze.
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ceengland7(at)gmail.com
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| Posted: Fri Oct 02, 2020 1:58 pm Post subject: ADS-B and Transponder antenna design... |
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On Fri, Oct 2, 2020 at 4:28 PM andymeyer <meyerkc135(at)gmail.com (meyerkc135(at)gmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: "andymeyer" <meyerkc135(at)gmail.com (meyerkc135(at)gmail.com)>
And I'm willing to send a pair of antennas to someone who's willing to analyze.
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Hi Andy,
I'm creating a new SD card 'build' for a Stratux as I type this. I'm definitely interested; and what do you use for a combiner, and what cable and cable length will work? I need to get the Stratux off the dash, and mounting it between the instrument panel & firewall will be the easiest location for me.
Assuming it'll work out for me, where & how much do I need to send?
Many thanks,
Charlie
ceengland7(at)gmail.com (ceengland7(at)gmail.com)
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andymeyer
Joined: 31 Mar 2015
Posts: 54
Location: SW MI
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| Posted: Sun Oct 04, 2020 2:05 pm Post subject: Re: ADS-B and Transponder antenna design... |
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I simply carefully spliced the Coax. I tried a 1GHz mux with and without a terminating resistor and didn't find any better real world performance and it was harder to package. That's one of the reasons I'd like to find out about the analyzer performance of these antennas.
Drop me an email as to where to send them. I assume you've got an analyzer? Let me know where to send it. I'd much rather have them dialed in at 978 as weather reception range is most important. If I can see 1090 traffic at 5 miles, I'm happy, but if I can only get 978 towers at 30 or 40 miles... 
I put my stratux back out of the way as well - talks great to my IFD540 via serial. I've only got about 3 feet of coax, but around the house, I had these hooked up to about 10 feet for testing. I'm flying with the Slim-jim, but recently found a better hiding place to try to di-pole if it'll fit in my spar well without sacrificing performance. I have 3 turns of coax at the base of the antenna for a BalUn.
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ceengland7(at)gmail.com
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| Posted: Sun Oct 04, 2020 2:24 pm Post subject: ADS-B and Transponder antenna design... |
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Sounds affordable to me. I don't have an analyzer now, but I've been planning to purchase one. This will motivate me. 
I'll send my address direct to your email address.
Thanks!
Charlie
On Sun, Oct 4, 2020 at 5:12 PM andymeyer <meyerkc135(at)gmail.com (meyerkc135(at)gmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: "andymeyer" <meyerkc135(at)gmail.com (meyerkc135(at)gmail.com)>
I simply carefully spliced the Coax. I tried a 1GHz mux with and without a terminating resistor and didn't find any better real world performance and it was harder to package. That's one of the reasons I'd like to find out about the analyzer performance of these antennas.
Drop me an email as to where to send them. I assume you've got an analyzer? Let me know where to send it. I'd much rather have them dialed in at 978 as weather reception range is most important. If I can see 1090 traffic at 5 miles, I'm happy, but if I can only get 978 towers at 30 or 40 miles...
I put my stratux back out of the way as well - talks great to my IFD540 via serial. I've only got about 3 feet of coax, but around the house, I had these hooked up to about 10 feet for testing. I'm flying with the Slim-jim, but recently found a better hiding place to try to di-pole if it'll fit in my spar well without sacrificing performance. I have 3 turns of coax at the base of the antenna for a BalUn.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498667#498667
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