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Digital television transmitters

Digital television transmitters

Digital television transmitters
Полное описание

Digital television broadcasting transmitters DVB-T / T2 of HC-DVB series with output power from 10 W to 10 kW are currently produced on the territory of the Russian Federation for the construction of digital terrestrial broadcasting networks (CNTS), which fully comply with the requirements of international DVB-T standards (EN 300 744), DVB-T2 (EN 302 755) and have the following key features:

  • built-in GLONASS / GPS synchronizer, GLONASS / GPS antenna;
  • hgh-performance 600-watt power amplifiers;
  • the original decoupled microwave adder, resistant to any combination of power amplifiers connected to it;
  • liquid cooling with integrated cooler (transmitter 1 kW);
  • automated pumping station with cold start capability (transmitters from 2 to 10 kW with external cooler);
  • digital linear and nonlinear pre-correctors;
  • control and monitoring, both from the front panel, and through the WEB-interface and SNMP protocol.

Transmitters with output power from 10 to 250 W are made with highly-efficient air cooling on heat pipes.

Transmitters with an output power of 2 to 10 kW are made with liquid cooling. All HC-DVB transmitters have remote control and monitoring using SNMP protocol and WEB interface.

Power supply of all nodes of HC-DVB transmitters is carried out by primary rectification of the input AC voltage 220/320 W with subsequent use of DC-DC converters. Such a power supply system makes the transmitters insensitive to the impulse noise of the power supply network and eliminates interference from the transmitters in the network.

The power supply of transmitters is adapted to Russian conditions and makes them less sensitive to impulse noise of the power supply network.

Specifications

Operating frequency range, MHz

470-860

Deviation from the central frequency for the year, Hz

in the MFN +/- 100 mode, in the SFN +/- 1 mode

Root-mean-square value of the modulation errors coefficient (MER), dB

not less than 3

modulation error ratio (BER)

not more than 106

Output signal spectrum Mask

In accordance with norms 19-02, supp 1

The power consumed by the transmitters HC-DVB from the AC 220/380 W is shown in the table:

Rv, W

10

50

100

250

500

1000

2000

5000

10000

Repot, kW

0,15

0,5

0,8

1,9

3,6

7,0

13,5

33,0

66,0