Doherty tech boosts NEC transmitters13 September 2013
A new family of UHF digital TV transmitters from NEC is on show at IBC, taking advantage of power-saving Doherty amplifier technology and offering impressive energy efficiency as a result.
The high power DTU-70D series and the low to mid range DTL-30 series transmitters are both able to offer an increase in power efficiency of up to 38%. The company is also showcasing a H.265 encoder in Hall 8, as well as its file-based video servers and super high resolution techniques.
Equipped with a new UX5000QF power amplifier, the DTU-70D transmitter enables maximum 17kW operation in a single rack. The unit power of UX5000QF becomes 1.56kW in Doherty mode, taking advantage of the latest generation LDMOS technology. The DTL-30 can also be equipped with new power amplifiers, with customers able to choose the UX400RF for 390W and UX800RF for 780W (both in Doherty mode).
The reliability and stability of these new transmitters can be boosted by the adaptive digital corrector incorporated in the exciter. This offers linear and non-linear pre-corrector functions, optimising signal quality and service coverage. In addition, the transmitters offer a smaller footprint than previous models.
The prototype H.265/HEVC encoder being demonstrated by NEC can support 4K broadcast
(3840 x 2160 at 60p). One of the core members of the Japanese project to develop 4K broadcasting, NEC aims to take advantage of the lower bitrate, better quality video and lower transmission expenditures offered by the H.265 standard. The trial encoder for 4K H.265 covers several types of input/output signals, offering four HD-SDI Dual Link and four 3G-SDI interfaces. The test encoder also features MPEG-2 AAC-LC and MPEG-4 AAC-LC audio compression.