The WISI TOPLINE II is the latest state of the art headend. The unique concept of signal processing provides a superb signal performance at the output of the channel processor. Microprocessor in each module controls all functions of the module. This concept allows stand-alone operation of the modules without the base unit OV 50A. In combination with the base unit OV 50A the output level after combining 10 channels is 110dBuV.
The base unit OV 50A consist of the painted aluminium made chassis and the power supply / output booster module. Optionally available is a lockable cover panel. OV 50A can be directly wall mounted or with the 19" rack mounting kit OV 99 direct rack mounted.
The high efficient switch mode power supply unit provides the required power for analogue as well later on digital processing modules. The integrated push-pull booster amplifier provides an output level of 110dBuV with 10 modules inserted and combined.
The multiplex output level can be adjusted up to -10dB with an adjustable attenuator located at the front of the power supply/booster module. The multiplex output level can be checked uninterrupted at the test socket (20dB). The function of the DC voltages are indicated by three LED at the front of the module. All in-and output terminals are F-female sockets. The output voltages are present at the voltage rails of the base unit. The TOPLINE Headend II in combination with the headend-controller OV 51A can be remotely programmed and controlled in combination with the BARCO Rosa NMS Soft- and hardware.

Description of the booster

The amplifier has two identical inputs for the left and right module rows of the basic unit OV 50A. The sum signal of the two inputs is looped out before the actual amplifier in order to permit additional signal processing or the combination of signals.
The amplifier is a push-pull amplifier in GaAs technology in order to obtain optimal power loss figures at the maximum RF output voltage. In order to maintain the C/N values, the level adjuster (10 dB) is placed between the stages. It can be operated from the front panel of the power supply unit. The gain (27dB) was selected so that all intermodulation products are >60dB away from the signal level (110dBuV) when the unit is fully equipped. The output signal is also available at a test output (-20dB). The LNC voltage of 13.5 V / 1 A is connected via two F-sockets to the DM distributor of the basic unit. LEDs on the front panel of the power supply unit, above the booster, indicate the presence of the supply voltages 5VDC / 12VDC / 13.5VDC. All RF connections use F plugs and sockets.