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Sexy Moon (moon@shitposter.club)'s status on Sunday, 29-Oct-2023 19:43:15 JST Sexy Moon

I wonder if my apartment building will get mad if I install an antenna on my deck. I have an SDR that can pick up airplane transponders but my mini antenna is crap.

In conversation about a year ago from shitposter.club permalink
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  Sexy Moon (moon@shitposter.club)'s status on Sunday, 29-Oct-2023 19:46:24 JST Sexy Moon
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  - radix023
  @radix023 thank you, this is perfect.
  
  In conversation about a year ago permalink
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  radix023 (radix023@noagendasocial.com)'s status on Sunday, 29-Oct-2023 19:46:25 JST radix023
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  @Moon this was fought out when Dish Network and DirecTV were providing a way to avoid being screwed by the cable companies:
  https://blog.solidsignal.com/tutorials/yes-you-can-put-a-dish-or-antenna-on-your-apartment-balcony/
  In conversation about a year ago permalink
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  1. Domain not in remote thumbnail source whitelist: blog.solidsignal.com
    
    UPDATED: Can you put a dish or antenna on your apartment balcony? - The Solid Signal Blog
    
    from @solidsignalcom
    
    Don't let the homeowners association tell you that you can't put up a dish. They're wrong, and Solid Signal can help you petition the FCC.
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  翠星石 (suiseiseki@freesoftwareextremist.com)'s status on Sunday, 29-Oct-2023 20:03:36 JST 翠星石
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  @Moon Yes, but it's better to be for forgiveness than to ask permission.
  
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  Sexy Moon (moon@shitposter.club)'s status on Sunday, 29-Oct-2023 20:04:14 JST Sexy Moon
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  - 翠星石
  @Suiseiseki oh I am not gonna ask permission just don't want to buy an antenna if they made me take it down.
  
  In conversation about a year ago permalink
  
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  pwm (pwm@crlf.ninja)'s status on Sunday, 29-Oct-2023 22:40:00 JST pwm
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  @Moon moxon antennas are pretty compact, I'm assuming you're trying to get uhf/VHF
  They are kinda like two element yagis bent around into a rectangle. Would be pretty inconspicuous.
  
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  Sexy Moon (moon@shitposter.club)'s status on Sunday, 29-Oct-2023 22:40:00 JST Sexy Moon
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  - pwm
  @pwm airplane transponder, not sure
  
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  Account: Aviation (avia@mu.zaitcev.nu)'s status on Monday, 30-Oct-2023 00:49:23 JST Account: Aviation
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  - pwm
  @Moon @pwm You don't need anything beyond a tiny stick and a ground plane for 1090ES.
  
  Wavelength is: 299792458/1090000000 = 0.275 m. Quarter is 6.9 cm or 2.7". Four wires are perfect for a ground plane, you just bend them to match to the impedance of your coax or receiver. Usually it's 50 Ohm, so something like 43 degrees. That's all! I soldered mine to the actual connector and used it indoor on top of the receiver in a USB stand. See this photo:
  https://zaitcev.livejournal.com/226449.html
  
  In fact, don't even do that. Just take a wire from an Ethernet cable, cut to under 3 inch, plug it into the receiver with the connector upright. The receiver itself provides the ground plane.
  
  The reason why this works is that airplane transponders are absurdly powerful. For example, my Garmin 333 is rated for 250 Watts. Not micro- or milli-watts. Watts! If your cellphone output that, it'd cook your brain in a minute.
  
  So stop thinking about unnecessary complexities and focus on the whole system.
  In conversation about a year ago permalink
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  1. Domain not in remote thumbnail source whitelist: www.zaitcev.us
    
    UAT on RTL-SDR update
    
    About a year ago, when I started playing with ADS-B over 1090ES , I noticed that small airplanes heavily favour UAT in 978 MHz, because it's cheaper. For the purposes of independent on-board traffic, thus, it would be important to tap directly into UAT. If I mingle with airliners and their 1090ES,…
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  Sexy Moon (moon@shitposter.club)'s status on Monday, 30-Oct-2023 00:49:44 JST Sexy Moon
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  - pwm
  - Account: Aviation
  @avia @pwm I actually have one of those little antennas but it doesn't seem to work inside so maybe I need just a long wire
  
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  pwm (pwm@crlf.ninja)'s status on Monday, 30-Oct-2023 00:49:49 JST pwm
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  @Moon so adsb? That's going to be a small antenna, wavelength less than a foot.
  Here's an example, note this antenna type is directional
  https://www.thingiverse.com/thing:5186387
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    Adsb Moxon Antenna by aseyhan
    
    from Thingiverse.com
    
    Most of the ADSB feeders / enthusiasts are not being able to put up antennas on the roof covering the whole 360 degree. But as a go to antenna, most of the time ground plane vertical antennas are being used at first and then co-linear coaxial antennas are being advised as an improvement over ground planes. If you have the ability to cover ~360 degrees, using these antennas is off course good for staying omni-directional. So this way you can get frames from all directions. But many enthusiasts are actually using them sticking out from a window - a balcony or sometimes even indoors near to a window. On those cases moxon is a much better antenna alternative compared to those omni vertical antennas as: Closed loop type antennas get less noise (QRM) compared to vertical omni antennas which improves SNR and that means more decodes even without a filter and Lna. You can use more gain on the SDR without hurting the SNR. It has the gain directed mostly on the forward direction so you have the gain where you need it. Forward! As that is the only direction you can go from a window or a small balcony on most of the cases. It has a good front to back ratio so this also means you get less noise from your own house/ electrical equipment as those things are behind the antenna. It still has quite good gain on sides so you can still get decodes from sides (even those side lobes has a better gain than a ground plane) Small and easy to build and easy to mount, more forgiving than vertical omni antennas on cases that you can not mount it far enough from the building. Details: This moxon is calculated for 1090 mhz adsb frequency and if you do it right you should end up with a SWR between 1.3 to 1.7 through all ADSB band which is quite acceptable for a diy antenna on this high frequencies. Just print it and put a 1.5 mm copper or aluminum wire around it and secure it with zip-ties. Cut the wire from the middle of forward point for a ~1.5mm aperture between 2 parts. Also gaps on the sides are following the calculation so if you cut approximately where the gaps are (as precise as you can) it will be close enough to be resonant on ~1090 mhz. You might want to do a little bit of filing after cutting the wires to make it straight. Solder a thin coax like rg 174 or rg 316 and keep the coax leads to feed point as short as possible. Make a small single turn loop ~1.5 cm wide of coax as near as possible to feeding point for creating a choke impedance for common mode currents for a better performance-pattern. From my window on a high building I'm easily decoding ADSB packets within a 400 km range with this antenna. And decodes are not only on the forward direction they are also on both sides! (on the paths that I'm not blocked by neighboring buildings). So I can say I have ~180 degree covarage for 400km's with this antenna without a filter or a LNA. Mount it vertical with the wire that you soldered the inner of the coax looking upwards and you can also tilt the antenna slightly upwards to get more decodes from higher altitudes. You can use the other stl file to print a small stick that you can superglue to antenna then you can easily attach it to a non conductive stick to create some space between the building and antenna. And off course have fun! 73 de TA2SUA
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  Sexy Moon (moon@shitposter.club)'s status on Monday, 30-Oct-2023 00:51:24 JST Sexy Moon
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  - pwm
  - Account: Aviation
  @avia @pwm the only reason I wanted a better antenna is I wasn't picking up anything since moving.
  
  In conversation about a year ago permalink

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