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ADS-B is a system in which electronic equipment onboard an aircraft automatically broadcasts the precise location of the aircraft via a digital data link.

The data can be used by other aircraft and air traffic control to show the aircraft’s position and altitude on display screens without the need for radar.

The system involves an aircraft with ADS-B determining its position using GPS. A suitable transmitter then broadcasts that position at rapid intervals, along with identity, altitude, velocity and other data. Dedicated ADS-B grounds stations receive the broadcasts and relay the information to air traffic control for precise tracking of the aircraft.

Automatic – Requires no pilot input or external interrogation.

Dependant – Depends on accurate position and velocity data from the aircraft’s navigation system (eg. GPS).

Surveillance – Provides aircraft position, altitude, velocity, and other surveillance data to facilities that require the information.

Broadcast – Information is continually broadcast for monitoring by appropriately equipped ground stations or aircraft.

ADS-B data is broadcast every half-second on a 1090MHz, digital data link.

Broadcasts may include:

  • Flight Identification (flight number callsign or call sign)

  • ICAO 24-bit Aircraft Address (globally unique airframe code)

  • Position (latitude/longitude)

  • Position integrity/accuracy (GPS horizontal protection limit)

  • Barometric and Geometric Altitudes

  • Vertical Rate (rate of climb/descent)

  • Track Angle and Ground Speed (velocity)

  • Emergency indication (when emergency code selected)

  • Special position identification (when IDENT selected)

The ability of a ground station to receive a signal depends on altitude, distance from the site and obstructing terrain. The maximum range of each ground station can exceed 250 nautical miles. In airspace immediately surrounding each ground station, surveillance coverage extends to near the surface.



Here at VK4FI, we are very interested in aviation radio reception and also in working with our friends at planefinder to provide coverage of ADS-B to the web so that other aviation fans around the world can get the full benefits from this amazing site. We approached planefinder to join there network of data feeds and we recently took delivery of a planeradar ADS-B reciever, with an external 1090mhz antenna and a GPS antenna. The antennas are mounted on the mast with our other antennas and we are now feeding in to the network.


High quality standalone ADS-B Receiver with MLAT, designed and manufactured in the UK


Key Features

  • High specification GPS for accurate multilateration 
  • Ethernet connection
  • Low power consumption
  • CE, FCC, RoHS & WEEE approvals

Full Featured Web Client

  • Graphs, stats, map and list views
  • View local MLAT plots
  • Share to Plane Finder
  • Support for Plane Plotter, VRS & 3rd party applications

Plane Finder Sharing

  • Simple installation
  • High uptime via self healing technology & auto-updating client
  • Supports ADS-B, Mode-S & Mode-A/C



Screen Shots of Planfinder Radar Feed from VK4FI

Coverage map with reception reports to to over 250 nm


Map View


Data View


3D View


Stats Page 1


Stats Page 2


Planefinder Webpage


How it works






Location  |  Weather  |  Shack |  Military | Time | Space Weather | ADS-B | Greyline  | QSL Cards| RSARS |Licence and Certificates
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 Steve Dudley( VK4FI)
Highfields - Queensland - Australia
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