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High Efficiency DTV Transmitter with Doherty Technology



October, 2012
Digital Horizon announced the production and delivery of new generation high efficiency digital TV transmitter based on the Doherty technology. The Symphony-600(800) RF transmitters are rated for pre-filter power levels of 600 to 800 Wrms, providing high quality, broadcast grade performance for all available Digital Terrestrial TV Standards such as DVB-T2, DVB-T/H, ATSC, ISDB-T, ATSC, CMMB, DTMB and 2 to 2.7 KWps for Analog TV. The Symphony-600 provides wideband performance over the UHF Broadcast band with state of the art Parallel Technology. The Symphony-800 featuring Doherty Technology with unbalanced RF drive, offers unprecedented efficiency at 40% or better, with significant energy savings for the Broadcaster. High efficiency means high reliability, long life and reduced electricity consumption, therefore operating costs. Fast and easy system set-up is now possible thanks to the built-in, automatic pre-correction circuitry.
1  Symphony-600: full UHF Broadcast band coverage 470-862 Mhz with built-in automated software pre-sets.
1  Symphony-800: high efficiency, narrow band coverage of the UHF TV Broadcast band.
1  Sixth generation 50V LDMOS RF Amplifier transistor devices.
1  Fully automatic built-in pre-correction circuitry for any COFDM Modulation
1  Fully protected against RF overdrive, excessive output VSWR & power supply over voltages.
1  High gain for full output with only milli-watts of RF drive power. Can be driven by a standard modulator.
1  Local interface with front panel display. Remote interface via Ethernet HTTP, SNMP, RS485 or Parallel.
1  Compact size with 1RU for modulator, 3RU for amplifier and 1 RU for power supply, total weight 50kg
1  Support both single phase or tri-phase power supply operation.
1  Options: RF band pass filter – High Voltage transient/lightning protection unit –Hot-swap of PSU modules

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