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| |-+  Feed Setup Pictures (Moderators: dave, RonR)
| | |-+  UNNT (OVB). International airport Tolmachevo, Novosibirsk, Russia.
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Author Topic: UNNT (OVB). International airport Tolmachevo, Novosibirsk, Russia.  (Read 5148 times)
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Posts: 2

« on: August 12, 2014, 12:19:58 PM »

[actual photos of the feed setup is down the thread]

Hello there.

Just wanted to let you know that here in Russia we're not only invading foreign countries, shooting down passenger airplanes and making other evil world-occupation stuff (all according to impeccable western media, of course), but has some sort of hobbies too. This is the handmade avia-antenna located 22km from airport Tolmachevo without actual radio visibility to it. Nevertheless, the quality of recieving is very good, exept for the planes on the ground. I'd like to raise the height of it, but unfortuanely this makes matters worse because of the intermods from FM Broadcast stations.

Will try discone antenna with the higher mast though. So far you can listen to the traffic here: http://mtl2.liveatc.net/unnt
« Last Edit: September 24, 2015, 09:55:48 AM by Radiotrance » Logged
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« Reply #1 on: August 17, 2014, 10:43:22 PM »

Hello and thank you! Now I can finally listen to the planes that flying above my home grin
And yes, quality is pretty good, at least, I can't tell the difference from other "mainstream" ATC.
« Last Edit: August 18, 2014, 12:09:55 AM by colonel_Shults » Logged
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Posts: 2

« Reply #2 on: September 24, 2015, 09:29:42 AM »

It's been more than a year and feed setup had changed many times in search of a clear audio.

Discone antenna turned out to be a no-go. That's the antenna now:

There is a NF-88118 notch filter and a lightning protection installed.

Airport Tolmachevo is weeell beyond those buildings. Distance is 22km (14 miles), there is a hill on the way and there is no line of sight whatsoever:

Despite that, all dispatchers do sound loud and clear now. But not the planes/cars on the ground, which are 50/50.

Backlight colors of the Uniden BCD996XT scanner are set accordingly to the Flightradar's 24 flight level coloring, from magenta to white:

For the listeners I'm streaming a metadata with channel names, so your media player should also show you who's talking right now.

Im planning on installing a higher mast and increasing antenna stack from 2 to 4 yagis.
There's a lot of international traffic in Novosibirsk Control zone, even some of the russian planes talk in english.
So, welcome to UNNT!
« Last Edit: September 24, 2015, 12:03:58 PM by Radiotrance » Logged
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Posts: 458

« Reply #3 on: September 28, 2015, 06:00:03 PM »


Looks like a nice setup, and getting anything on the ground, let alone 50/50 at 22km and over a hill is pretty damn good. That being said, there may be a few things you might ponder as you experiment. Firstly, the theoretical gain of 3db by doubling the elements in your array is just that... theoretical, and to really HEAR a difference between 50/50 and say, 80/20 in the real world requires more like 5+db over whatever you are getting now. I also believe that your current mounting arrangement is not ideal for those two-element arrays since the reflectors are too close to the mast and you've got all kinds of interaction going on there. In fact, since your driven elements are simple dipoles, you'd probably be better off removing the reflector elements and spacing them (the driven elements) both in distance from the mast as well as distance from each other as if you were just making a vertical collinear. Of course it would be even better if you made some folded dipoles for the driven elements because it is much easier to make a phasing harness from 75 ohm cable and the bandwidth is wider, etc., but I really think that two more yagis and another ten feet ain't going to get you there with all the additional configuration parameters and losses.

If I were to do anything at all with your current, working array, I think I would instead try stacking your two yagis HORIZONTALLY, using a horizontal cross T at the top of your mast. Spacing say, six feet apart should be enough, but you can work with the spacing model on a computer (EZNEC, etc) to minimize and/or tailor the side lobes, which is the principle advantage to stacking vertically polarized yagis horizontally since a yagi in vertical polarization is not as tight in azimuth as it is in elevation, and you want to focus both. Stacking at the correct horizontal spacing can do that. For more information and/or pictures of what I am talking about, search "amateur EME arrays".

Anyway, it's good hearing from Novosibirsk, my favorite Russian town. It's the name of the Russian sub tender in that terrific cold war movie, "The Bedford Incident".

Good luck with your experiments in seeking perfection, obviously you have not been properly indoctrinated in the old Russian engineering axiom, "Better" is the enemy of "Good Enough".


Capitalist Pig

Кстати, семья моей жены из России


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