Rohde e Schwarz Tv Transmitter 10Kw, 20Kw, 40Kw liquid cooled Analog/Digital Tv Transmitter NV/NH7000 series. These transmitter are composed by: - Encoder for analog TV, DVB-T or ATSC or ISDB-Td - Digital precorrector - Modulator - Synthesizer - Controller - Control unit - Motherboard - Power supply The UHF transmitters are available for analog TV with powers of 10 kW to 40 kW and digital with powers of 800 W to 6.4 kW Each amplifier has its own power supply that is integrated into the power amplifier The amplifier module is self-engaging and can be either on the top or bottom of out any loss of liquid from the closed cooling system and without impairing the operation of the other modules. The Power Amplifier use a advanced LDMOS technology. The power amplifiers feature high linearity, excellent efficiency and compact design. The power supply is integrated into the amplifierer module, which is an enclosed unit. There is practically no heat dissipated in the rack since the air circulates within the amplifier module by means of a radial fan and the residual heat is conveyed to the cooling system via a heat exchanger. Protective circuits against rejection, overtemperature etc are provided. The junction temperature of the transistors is around 120 °C under normal operating conditions and at an ambient temperature of 25 °C. The power supplies are fed with AC supply voltage, i.e. no auxiliary voltage suplies are required, which improves the availability of the transmitters. Parts exclusively made of stainless steel, aluminum or plastic are used for the cooling system in the transmitter rack. All transmitters can be equipped with a second exciter (optional) and the associated automatic switchover unit, the two units being integrated into the transmitter rack. Warranty: 6 months (the transmitter must to be installed from qualified technicians)