MegaSector - Solid State Switched Sector Antenna

The Telenav MegaSector is a fully automated extended range, receiving antenna for microwave signals in the GHz bands.

The MegaSector consists of an array of high gain, passive, antennas arranged to provide 360º coverage in azimuth, with an additional up-looking antenna for signals when transmitted from overhead.

The construction shows the 12-segment antenna array, each having approximately 30 degrees (azimuth) by 10 degrees (elevation) beam width yielding approximately 22dBi gain at 2.4GHz. Each sector has approximately 3 degrees overlap with control switching hysteresis.

For overhead and close in over-fly of the aircraft, an up looking antenna with 90 x 360 degree beam provides for a semi hemispherical directional antenna array. Internal, low noise booster amplifiers enable the ‘RF’ signals to be distributed to the receiver using low loss feeder and subsequent video distribution.

By using the Telenav process, which combines the mobiles’ (GPS) position with the transmitted video, the MegaSector Controller will derive the bearing (and range) to where the mobile is transmitting. By selecting the appropriate sector the microwave signals are tracked wherever and whenever there are transmissions on the dedicated frequency.

Being a solid-state system there is no operator intervention required and the MegaSector can therefore be located at a convenient site for optimum reception of the transmissions. The received video signal may then be linked to where needed by conventional means.

The Telenav MegaSector Control system decodes the GPS data from the video and derives the bearing from the local position. Display of the mobiles’ dynamic position information is provided along with other tracking parameters.
The Telenav MegaSector is suitable for fixed sites to provide long-range microwave signal tracking with ranges beyond 60 Km.

Using the latest GPS and electronic control technology and signal filtering the MegaSector is also capable of dual channel operation such that two independent transmissions on differing channels may be tracked with the same antenna array.

In addition, the antenna elements may be configured for diversity receiving techniques as used in COFDM digital transmission systems.

Azimuth sector selection is derived from the relative positions of the receiving antenna and remote mobile transmitter. Using GPS techniques the accuracy of sector steering can be maintained within 1 degree. The MegaSector is equally compatible with traditional analogue and the latest digital video transmission systems.

Specification:
Antenna array – nominal gain 22dBi at 2.4GHz in linear, left or right hand circular polarisation
Frequency range – 2.2 to 2.7GHz – other bands to order
Power – 12V dc or and 90 – 250 volts ac universal (standard)
Video - Standard PAL, NTSC, and digital formats
Acquisition time less than 30 seconds – typically 15 seconds, after system set-up Dimensions:
Antenna array 1.6 metres diameter x 0.7 metres high
Controller – 300 mm x 200 mm x 55 mm

Weight:
Antenna pedestal 65Kg (approx)
Environmental:
Temperature - Antenna array - -10 to + 60 C, Controller - 0 to + 50 C (TFT/LCD
limitation)
Humidity 0 - 90% non condensing