controlpanel in 19" rack mount (2 HE)

(dimensions (W x H x D): approx. 484 x 88 x 255 mm)

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operation at a broadcaster
Equipment Gesellschaft für Internationale Elektronik Systeme
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AutoTracker III

Bi Axial Positioning Control
      CONTENT:   system description | extensions and upgrades | technical specifications | price list     

For automatic selection of satellites and tracking of inclining satellites. Ready for yagi and radar antennas. Intelligent self-learning control system.

Designed for commercially available linear motors (actuators) with any discretional lift as well as for heavy geared motors (AC as well as DC motors, e. g. 3-phase models).

  • Auto Focus, Auto Tracking, Auto Protocol, Super Search/Scan and Auto Start after power failure
  • limit memory for both axes
  • most comfortable in installation and operation
  • superior to integrate into existing equipment
  • single axis operation (e. g. FM dipole antennas)
  • horizon-to-horizon operation (AZ up to 360° & EL up to 90°)
  • resolution of 65,000 steps each axis
  • optional: low-voltage version (for buffered battery operation)
  • control for heavy rotor motors (e. g. 3-phase models) and monster antennas through external contractors
  • optional RS 232 C Interface
  • optional 19" rack mount version
  • optional relais & power extender
  • manuals in English language!

Photo 154 Professionals – one of a breed!
EGIS rotors with Yagi antennas for ATS-3 satellite (also used for commmanding & telemetry
VHF on GOES-3) 149 MHz & 137 MHz and LES-9 satellite 302 MHz & 249 MHz.
All of the above antennas are used in support of the "United States Antarctic Program". The
'Malabar Satellite Operations Center' of the University of Miami provides communications to
various research stations on the Antarctic continent, including the 'Geographic South Pole
station', and 'Palmer station' in the Antarctic.

SYSTEM DESCRIPTION back to the beginning

The AutoTracker III is a microprocessor based control unit including the positioning logic as well as the power output unit for the rotor motors. It allows to drive two separate motors (max. 2.5 Amps each) directly with Reed-Pulse Sensors for the elevation and the azimuth.

  • horizon-to-horizon operation (AZ up to 360° & EL up to 90°)
  • each axis will be resolved by 65,000 steps

The read-only memory contains information about all stationary satellites around the world.

On the fly, you may – within the physical limits of the external devices – select any desired satellite. Only mechanical unlinearities of the system have to be corrected manually. If necessary, the system now will automatically track the inclining orbit.

In order to allow this automatic tracking, the AGC voltage from the satellite receiver has to be fed to the analogue input of the control unit, which will then optimize the positioning for maximum field strength. The operational range of the AGC signal can be matched to the satellite receiver in terms of amplitude/sensitivity as well as of null (max. 12 V, min. 0.1 V – each polarity).

The search and tracking quality (AUTO FOCUS/AUTO TRACKING) may be influenced by selection of maximum deviation, next search cycle, fixing of search amplitudes and search algorithm. The field strength information is delivered, by means of the AGC voltage, by the satellite tuner thus allowing the reception of signals within the C, S and Ku bands.

The display of the control unit continuously shows the relative signal strength. Before dropouts can hamper the transmission of data or even lead to a visual loss of quality, the system will automatically optimize the field strength, fast and with ultimate precision. The necessary AGC connecting cable is included in your package.

For connecting and the remote control via sat-tuner the control computer features a receiver interface with settable transfer rate (1 to 99 pulses/sec.) using 4 wires only (motor: 5 to 60 V, pulse: max. 50 V/100 mA); simultaneously transferring signals during active motors too!

These functions and a lot more are efficiently supported by many system helps:
Receiver pulse synchronization, motor sensor monitoring, motor emergency operation, motor stop by all keys, park position, optionally focussing via RS 232 interface and many more.

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computer with display (desktop version) 19" rack version

EXTENSIONS & OPTIONS back to the beginning


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For communicating with an external computer, the 'AutoTracker' is also available with optional two-way »RS 232 C Data Interface«. (Data format: 8-bit/no parity/1 stop bit/50 to 9,900 Baud with hardware handshake). They are particularly suitable in conjunction with 'AZ360' and 'EL90': for positioning on and tracking of non-geo-stationary objects such as stellar constellations (astronomy), orbital space stations (MIR, ISS), amateur radio satellites (OSCAR) and up onto low flighing LEO satellites, respectively such ones with ecliptic orbits. As well sun (solar panel tracking and solar energymeasurements). Another mode of application is the positioning of heavy floodlights and light deflection mirrors for outside motion picture productions, or for light guidance systems in architecture. Direction-related information is supplied to the rotor control via "RS 232 C interface". It is also possible to recall information on the rotor s operational status by means of the computer in opposite direction. The intelligent interface even allows remote-controlled operation via telephone modems.
The data interface can also be used for field strength-related positioning and tracking of telemetry signals, e. g. meteorological probes (weather balloons), radio direction finding of mobile transmitters, etc. Measured direction and field strength readings are continuously transmitted to the external computer via data interface!

Command syntax examples:

  • Rotate azimuth motor to 134.56°   –   "AZ = 134.56 [CR]"   or
  • Enter elevation position into computer   –   "EL = ? [CR]"
  • Using the instruction-word "FOCUS" automatically starts an focussing-run.
  • Using the instruction "RESULT", after each auto-focussing the automatic output of operational and performance data is induced, e. g. AZ- and EL-angle with corresponding fieldstrength. These can be transferred to a computer (as a protocol for instance), but also onto a printer directly! These data can be stored on the computer's hard disk in a file and can be used in any commercially available spreadsheet program (MS Excel etc.) or in data bases and can be displayed graphically without a special program!
    The version 'AutoTracker with semiconductors' is inserting date and time into this data string additionally. See a sample of this data string here:
    Row-no.; day; date; time; tracking-channel; AZ-angle; EL-angle; AZ-motor-pulses; EL-motor-pulses; level of analog-channel 1; 3; 4 in the format as follows: 00000 Mon 11.12.98 15:23:44 01 00000 00000 00000 00000 00000 00000 00000.
    This data can be transferred to a modem also! Built-in filters allow a multi rotor operation at a single interface. (Not all applications have yet been discovered. What's your idea: …?)

This interface is needed for the extension "GPS CAPTURE" and for operation of the web server "EGPOSER II"as well as for the software "SatPicker I" and "SatPC I".



Hardware and software extension for dynamic, controlled dialogue-guided servo speed definition. Selectable starting acceleration, slow-motion speed and braking retardation with high resolution. (Ramp control). Particularly useful for positioning and focussing of large antennas.


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For command and control centers in studios, ctv-stations, sat-communication bureaus and ENG a 19" rack mount version is often needed. This item is easily mounted as a standard "AutoTracker" into a 19" rack with 2 HE and 290 mm. High electromagnetic compatibility (EMC) and plug-in connections as well as an illuminated display are included in the price. You will also get a front safety lock (two keys) to lock certain functions and prevent any misuse.
Power supplies for logig and motors can be separated. Via a separated power input interface motors can be supplied by an extern power supply with lower or higher controlled voltage.


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This device provides an AGC-analogue-signal for a manual and automatic alignment of aerials/antennas, depending on electric field force. It was designed for "finding" as well as "tracking" of satellites but also for other "mobile" RF-signals.

An entire satellite, a specific transponder or a defined frequency can be selected via the integrated spectrum-analyser in order to generate the AGC-signal.

details in pdf-format


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The EGPOSER II (EGis-POsition-SERver) is a web-server, making EGIS-antenna-positioners controllable by means of a computing network. A choice of satellite- positions will be made available to all clients for selection and execution via internet or intranet.

Any internet-browser (i. e. MS Internet Explorer, Mozilla, Apple Safari etc.) can be used to select and approach platform-independent satellites as well as positions from the net. It goes without saying that a simple hierarchy of programmable authorisations will be already implemented which will control the number of users selectively. In addition to passwords you may also use address-barriers. Usage becomes transparent by a log working automatically in the background.

NEW: Programs, memory, logs and everything "soft" are stored undetachably on flash memory. Therefore no mechanical devices are needed!

Typical users are news-editorial departments, studios, news agencies, broadcasting services but also research establishments and public authorities.

The hardware is installed into a 19"-rack-frame/housing (optically matching the rack-frame "ProfiTracker" and "EGPOSER").

CAUTION: The used control devices (ProfiTracker) must be provided with a RS232 interface for operation of the EGPOSER (option).

details in pdf-format


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The Anemometer performs the measurement of the local appearing wind-speeds. The 4-wire-interface at the control unit is quite ready to read and process the signals from the anemometer.


  • 3-shell-system
  • shell ring outside-Ø: 120 mm
  • shell-Ø: 40 mm
  • profile: 70 mm
  • material: ABS
  • pulse transducer system: magnet/reed switch
  • pulse-rate: 60 km/h = 16.8 m/sec. = 47 Hz
  • suitable for mounting onto or besides the mast

ATTENTION: The 4-wire-interface can be used either to connect a satellite receiver or to connect a wind-sensor – not both.

SPECIFICATIONS back to the beginning

power supply 230/115 V AC or 10 up to 28 V DC (option)
motor control 24 V DC/max. 2.5 Amp.
pulse frequency max. 200 Hz
pulse width min. 2.5 msec.
resolution 65,000 pulse/axis

power supply AC 230/150 V AC or DC 6 up to 48 V
motor control AC max. 6 Amp. – DC max. 12 Amp.

PRICE LIST back to the beginning

AutoTracker III bi-axial positioner for external gear motors (basis version) 1 998.00

Data-Interface hard- & software extension RS 232 C interface 798.00
Relais- & Power-Extender power, control & switch extender (DC- or AC-version) 398.55
MotionControl hard- & software extension for basis version & extender 989.00
GR-19 basis unit (& if given power extender) fitted into a 19" rack mount (2 UH) 998.00
SPECTRAMIZER spectrum analyzer incl. AGC outlet in 19" rack 1 997.50
EGPOSER II web server for Antenna-Rotor 3 122.50
Wi-S1 wind-speed-sensor/shell-anemometer 317.35

We also offer power supplies according to your motor specifications.

Subject to technical change without prior notice.

      CONTENT:   system description | extensions and upgrades | technical specifications | price list     

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