Live ATC

KOJC is a very popular training airport as well as a popular corporate flying destination because of its location in the heart of Johnson County’s economic belt. Johnson County Executive Airport is located at 151st Street and Pflumm Road in between the cities of Olathe and Overland Park, Kansas.

I am very happy to announce, that as of March 29, 2008, is hosting a streaming audio feed of local KOJC ATC traffic sponsored by Pilot Mike’s Weblog. has hundreds of ATC feeds from all over the world. Dave and the gang have really done a lot of work putting streaming ATC in one, easy to use, site.

Live Air Traffic Control Communications |

KOJC – Live ATC Audio Stream
(hosting courtesy of

What frequencies are scanned?

Executive Tower (1300Z-0300Z) / CTAF: 126.000
Executive Ground (1300Z-0300Z): 121.600

Columbia AFSS (OJC RCO)122.150
Air Associates UNICOM (FBO): 122.950
KCAC UNICOM (FBO): 131.500
Emergency / “GUARD”: 121.500

Kansas City Approach (S of Line from LWC to 4GV): 118.900
Kansas City Approach (Sub-Sectorization – East): 120.950
Kansas City Approach (W of RWY 1/19): 124.700
Kansas City Approach (E of RWY 1/19): 118.400
Kansas City Center (Butler, MO – Low): 125.550
Kansas City Center (Topeka, KS – Low): 123.800
Kansas City Center (Emporia, KS – Low): 127.725
Kansas City Center (Chanute, KS – Low): 132.900
Kansas City Center (Sedaila, MO – Low): 135.575

What equipment is used to produce the live stream?

Version 3 (10-2013 to Present):

  1. Raspberry Pi Model B – a credit–card sized low power computer board that can be powered with a USB Cellphone Charger. It’s a miniature ARM–based PC running at 700 MHz with 512MB RAM running the Raspbian OS (a free operating system based on Debian GNU/Linux and optimized for the Raspberry Pi hardware).
  2. Griffin iMic USB Audio Interface – USB Sound Card
  3. Uniden Bearcat 245XLT Hand-Held Scanner
  4. Gefen EXT-AUD-1000 Audio Extender (Mic/Line to Cat 5e Converter). This extends the audio from a 2nd floor bedroom to the LAN Closet in the basement where the dedicated streaming machine is located.
  5. DarkIce – An open-source live audio streamer application. It sends audio from an audio interface, encodes it and sends it to to the Icecast2 Server over the Internet.
    (Encoding: MP3 Lame, Bandwidth Usage: ~16kbps)

Notes: I decommissioned the version 2 setup because this computer was purchased back in 1998 (15 years old!). It still works fine, but it has huge power usage. With Windows XP ceasing to get security updates after April 8, 2014, it was time for a change. The Raspberry Pi is very small and uses very little power. This whole setup ran me about $65!

Version 2 (05-2009 to 10-2013):

  1. Dell Dimension XPS R400 – Pentium II 400 MHz, 384 MB RAM, Windows XP Professional
  2. Uniden Bearcat 245XLT Hand-Held Scanner
  3. Gefen EXT-AUD-1000 Audio Extender (Mic/Line to Cat 5e Converter). This extends the audio from a 2nd floor bedroom to the LAN Closet in the basement where the dedicated streaming machine is located.
  4. OddATC Client provided by connected via Internet to the Icecast2 Server
    (Encoding: MP3 Lame, Bandwidth Usage: ~16kbps)

Notes: Scanner was changed to spare my family from the flashing LEDs during the night as the best shot of the airport is from our bedrooms and I live in a subdivision where I can’t erect an external antenna.

Version 1 (03-2008 to 05-2009):

  1. Dell Dimension XPS 410 – 2.4 GHz Intel Dual Core, 4GB RAM, Windows Vista SP1
  2. Uniden Bearcat 210XLT Desktop Scanner (yes, it’s an oldie! I’ve owned it since I was 12!)
  3. OddATC Client provided by
    (Encoding: MP3 Lame, Bitrate: 16, Sample Rate: 11025) to Icecast2 Server

Reason for decommission: We finished our basement and our office was moved from the 2nd floor to the basement were scanner reception is poor and I live in a subdivision where I can’t erect an external antenna.

Why do you scan the Kansas City ARTCC (Center) Frequencies?

After the KOJC tower closes for the evening (0300Z) the feed can get kind of boring so by scanning the center frequencies, it provides some audio on the feed. In addition, the folks that work VATSIM (Virtual Air Traffic Simulation Network) emailed me and asked to add some Kansas City Center frequencies in so they can get some real world examples of audio from aircraft in the area.

Note: I’m not affiliated in anyway with other then donating my own hardware/bandwidth/time for an airport feed; however, if you enjoy, I encourage you to leave a donation (the link is right on their front page). The guys that maintain the site do so as a hobby; however, it does cost real money to host/maintain the site.

3 thoughts on “Live ATC”

  1. Mike,

    I’m down around KSGF and it does not have a feed. I was going to see if you had any advice for me. I am going to buy a scanner and was looking at some used Bearcat 350’s.

    My main concern is getting the approach frequencies. I have a handheld that gets the traffic just fine but not tower or approach (I’m 9.8 miles from the airport on the other side of town). I’d like to put an antenna in my attic or on the roof so it’d end up another 20-30 feet off the ground. Any ideas on how high the antenna would need to be to get tower and approach? My house is roughly the same elevation as the airport.

    Making sure I can get approach and tower before I invest in a scanner is a bit concern for me. I know from flying that your ability to get distant ground based transmissions drops off pretty quick but usually I’m busy flying the play and don’t pay attention to when exactly I can’t hear 121.8 from another airport…

    I’ve got a spare Raspberry Pi I haven’t done much with yet and this sounds like a fun project to use it on. Any hiccup or gotchas I should look out for? I’d look to run an RG58 from the attic to my office and keep the scanner in the office so I don’t think I’d need the audio extender.

  2. Hi Landon,

    Sounds like you might need a directional antenna to pick up the tower. Even in the attic you might have some trouble being almost 10 miles out at nearly the same elevation as the tower. To test you might see if you can barrow a handheld scanner or airband transceiver from another pilot and see if you can hear the tower from up there.

    As far as the Raspberry Pi goes, the setup is pretty easy and the guys are well versed in the setup. One recommendation I have is to make sure you invest in a good USB sound card. There are tons of reports in the private feed owners forum at of people using cheap sound cards and having issues. The Griffin iMic seems the be the one that works best, but the price is nearly that of the Raspberry Pi.

    Good luck and keep me posted on what you decide to do!

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