This drawing was prepared and posted by me 3 years ago in Flightradar24 and Planefinder forums. At that time I have not started participating in Flightaware Forums. It was intended to show varieties of designs available on the web, each design posted by a different persons.
29 May, 2014: forum.flightradar24.com/threads … #post52586
31 May, 2014: forum.planefinder.net/threads/a … 4#post-795
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I was almost 100% sure that it was your drawing ab cd , no copyright violation intended, i found it on some slovakian guy’s blog where he wrote extensive details about how to build a CoCo with balun sleeve.
It’s been a while but I’m starting a new round of tests still trying to mount a FA stick directly to an antenna and have good results. Previous test with the FA 49 inch antenna cut reception in half when mounted directly to an orange FA amplified tuner. My theory is the 9db antenna is too much when combined directly with the amplifier. They work great with RG6 between them. So now I made a cantenna directly on the FA stick. I recall the gain on a cantenna is 2db or less.
It was a little extra work. I do not have a 1/4-36 nut for the SMA connector so I drilled the hole in the can a little small and made the SMA thread itself into the can. It fits barely snug but I did put coax connector grease on it in an attempt to help it out until I can get the appropriate nut. The SMA hole is .97mm which is a little smaller than the 18AWG coax conductor so I filed it down to fit snugly and also put a dab of coax grease on it. I have it mounted about 6ft from the floor of my workroom on an exterior wall of my house. I’m using WiFi so I can easily move it around, especially when I am able to move it outdoors. It is too tall for my previous cantenna container, so something new will need to be made. It’s only been running in the current position for about 30 minutes but seems to be doing okay for under a metal roof and behind a brick wall in a heavily wooded area, LOL.
http://i207.photobucket.com/albums/bb245/Zeek_70706/ADSB/Cantenna%20Test_zpsqskml4eu.jpg
After letting it run inside for a few hours, I decided to move it outside…With a USB extension cable to the Pi inside of the two buckets. It barely fits in my container so to make the antenna level I tilted the stick slightly.
http://i207.photobucket.com/albums/bb245/Zeek_70706/ADSB/IMG_1804_zpsfbxbkhxa.jpg
@abcd567 - the length specified for cutting the original dongle whip antenna (in the first post) is too long. There is a small portion of un-shielded wire inside the base already, like 10mm.
post194032.html
You don’t agree with your own post?
Discovering that about 15mm portion of vertical member is hidden inside the base, was a later development.
Based on this discovery, I recommended cutting the removable part to 52mm, instead of 67mm.
Please see this thread:
Episode 2 of Improving DVB-T Magmount Antenna.
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Well… you can edit maybe the original post then? That thread is more “visible”.
The improvement by reducing whip from 67mm to 52mm is around 5% to 10%, and it is not worth confusing the newcomer/beginner right at start with too much details (hidden length inside base). For all practical purposes 67mm is good enough, unless someone wants to squeeze out the last bit of signal.
Hello,
I building a simple J Pole and after trimming the elements 0.5mm each day for three weeks I now have a antenna which is slightly better than a 1/4 wave. 
After reading the forum I had a feeling tuning the J would take time to tune.
I now want to turn the simple J in to a super J Pole, but using a coil rather than a stub between the two radiating elements. @aldoir used a 53mm coil of 16asg with a 5mm id.
Has anybody else tried a coil to link two elements and how do I calculate the size of the coil if i have 1.6mm insulated copper mains cable rather the the 1.3mm enamelled copper wire that @aldoir used?
Thanks in advance.
Thanks @abcd567 for the link and I have found the section on coils in this chain at Dec 2016 a link Improving the Super J-Pole Antenna.
What happened to the “stickiness” of this thread? Did it get intentionally unpinned or lost during the discussion system upgrade? dbaker made it sticky back in reply #14 in response to a recommendation by user tjowen and I still think it’s a good recommendation.
Hello, I was planning on making the spider antenna in this post. I had found some type of cable in my shed that was there from previous residents. As I have been unsheathing it, i found it has more that 3 layers, the very outside layer is the insulation, next is the metal wire braid, but underneath the braid is something like a metal foil thats wrapped around the insulation. And of course underneath the foil is the insulation, and underneath that is the copper wire. In the piece that is supposed to be 18cm long, do i insert the 9 cm copper wires between the outermost insulating cover and underneath the metal wire braid? I am new to aircraft tracking so was just wondering. Also could you give me a list of things i need to buy? I see i need the f connector, but i would need something to convert that into an mcx connector so i could plug it into my reciever.
https://www.amazon.com/DGZZI-2-Pack-Coaxial-Adapter-Connector/dp/B071HGDW4T/
https://www.amazon.com/DHT-Electronics-coaxial-adapter-female/dp/B00CVTRTUC/
I bought 2 of these: https://www.amazon.co.uk/gp/product/B00V4PS1L0/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Should i buy this: https://www.amazon.co.uk/gp/product/B077DSMBL1/ref=ox_sc_act_title_1?smid=A104E3TJC5XP4S&psc=1
Why would you think SMA and F connector could be screwed together?
You would need another adapter from F to SMA.
Also check that you get male/female right.
(offtopic: according to Murray Head that’s especially important while playing chess in Bangkok)
What can I get that would be compatible with the SMA female and with the spider antenna antenna project? Im fairly new to all of this so I am not very confident about cables and such.
as you already have the F connector and you probably won’t find a SMA connector that fits directly on the cable you will just need an additional adapter.
I have not bought the F connectors yet, only the MCX to SMA connector. The thing is i found some cable in my shed and I am not sure what type it is. Could you help me out? On the cable I just read that it says U-JIN/TFC-T10. I found the specsheet online, http://www.amphenol.ru/pdf/RG-58AU%20Gray%20Jacket.pdf
