VHF UHF 1000W Digital TV Transmitter

• Customization: Available
• Type: Transmitter
• Function: Signal Transmitting Device, Signal Transmission Equipment, Signal Monitoring Equipment
• Model NO.: ZHC518D-1000W
• Condition: New
• Frequency: UHF/VHF
• Output Power: 1000W
• Output Interface: 40 (1-5/8")
• Size: 1840mm*1280mm*680mm
• Weight: 350kg
• Channel Bandwidth: 30MHz
• Transport Package: Export Wooden Box
• Specification: Professional
• Trademark: ZHC
• Origin: Hangzhou
• HS Code: 8525500000
• Production Capacity: 100PCS/Month

Product Description

ZHC518D-1000W Digital TV Transmitter

 

Overview:

This product adopts a brand new design with full bandwidth and high efficiency, modular building block combination structure, dual excitation automatic switching, highly artificial intelligence control system, complete VSWR, over temperature, over voltage, over current, over excitation and other protection functions. The entire machine provides a one-line remote control and telemetry serial communication interface and TCP/IP interface.
This product has excellent performance indicators and extremely high reliability. The parallel redundancy design of power amplifiers has a large margin, and the hot-plugin power supply N+1 backup redundancy configuration has high reliability. The entire machine is composed of 9 AMPLEON high-power field-effect transistors (LDMOS) BLF989E, and the maximum output power can reach 1200W. When a single Doherty type power amplifier outputs 180W, the working efficiency can reach over 50%. Combined with a low loss high-power synthesizer, the overall efficiency is ≥ 35%, and the maximum efficiency can reach over 40%.
The power distributor of this product adopts microstrip technology, with small size, good consistency and stability. It is packaged in an aluminum alloy shielding cavity formed by precision milling for easy production testing and maintenance. The power synthesizer adopts the suspended copper strip line developed by our company to synthesize the full bandwidth power synthesizer. It has the characteristics of low loss, high isolation, small phase difference, and large power capacity, and is particularly suitable for use in all solid-state full bandwidth digital TV transmitters.
The automatic gain control power output of this product control system is stable, automatically reducing power in case of failure, and adaptive shoulder correction.
This product has comprehensive multiple detection and protection functions such as overcurrent, over temperature, and over power. The ten inch touch screen provides a friendly human-machine interface, displaying the working status of the entire machine and power amplifier components in real-time.
This product supports multi frequency network (MFN) or single frequency network (SFN) networking methods.
 

Features:

All solid-state full bandwidth (470-700MHz or 470-800MHz) digital TV transmitter (without installing output filter)
The entire machine is equipped with two main and backup actuators and one RF switch, with adaptive pre distortion correction and 1+1 actuator automatic switching. The exciter has no RF signal and can be switched between three modes: manual, automatic, and remote control
High linear and efficient LDMOS multi body power amplifier, hot swappable 2+1 parallel 3500W switch power supply, high overall efficiency
Computer remote telemetry and remote control, networked interface and software, the entire machine provides a one-line remote telemetry serial communication interface and TCP/IP interface.
Good human-machine interface, with two independent normally open physical buttons for "power on" and "power off" on the panel of the entire machine, with one button fully automatic power on/off
There is no intermediate amplifier between the exciter and the power amplifier unit, completely eliminating the dead center of shutdown faults. The connection between the power amplifier unit and the synthesizer adopts a hard connection method.
The switching power supply adopts direct hot plug and has protection functions against surge, overvoltage, overcurrent, undervoltage, and phase loss.
Adopting parallel redundant design of 400W power amplifiers in the same phase and direct hot swapping method, they can be backup to each other and can be replaced at will.
The cooling method adopts a low noise and efficient PWM automatic speed regulation DC fan for forced air cooling.
The output interface adopts an upward 40 direct feed output for easy connection.
Equipped with multiple protection functions including overcurrent, overvoltage, over temperature, over standing wave ratio, over excitation, phase loss, and three-level lightning protection measures, it can ensure the safe, stable, and reliable operation of the transmitter, and can work continuously for 24 hours

Technical Specifications:

1. General indicators
1) Environmental conditions
ambient temperature
Normal operation: -10 ºC~+40 ºC;
Permissible working temperature: -20 ºC~+50 ºC;
relative humidity
Normal operation: ≤ 90% (20 ºC);
Permissible work: ≤ 95% (without condensation);
Altitude: ≤ 4500m.

2) Power supply
Three phase/single phase, AC380/220V/110VAC, 50Hz/60Hz

2. Technical indicators
1) Main technical indicators
Performance indicators of 1KW terrestrial digital television broadcasting transmitter (see Table 1).

Table 1 Performance indicators of terrestrial digital television broadcasting transmitters

No.	Item	Specifications
1	working frequency	Comply with relevant regulations of GB/T 14433-1993.
2	Single frequency network mode frequency adjustment step size	1Hz
3	Frequency stability (3 months)	When using an internal reference source, the frequency stability is ≤ 110-7; When using an external reference source, the frequency stability is ≤ 110-10.
4	Frequency accuracy	For MFN mode, frequency accuracy ≤ ± 100Hz; For SFN mode, frequency accuracy is ≤ ± 1Hz.
5	Local oscillator phase noise	Specific indicators can be found in 2) Local oscillator phase noise (Table 2 Transmitter Phase Noise Index)
6	RF output power stability	≤±0.5dB
7	Reflection loss of output load (within 8MHz band)	Normal operation: ≥ 26dB; Permissible working: ≥ 20dB.
8	Shoulder (measured before the filter at ± 4.2MHz off center frequency)	≤-36dB
9	In-band unevenness  (fc ± 3.591MHz)	Within ± 0.5dB (non dual pilot mode)
10	Out of band spectral characteristics	Comply with the relevant regulations on out of band spectrum templates in GB20600-2006.
11	Modulation Error Rate (MER)	≥32dB
12	Transmitting power within adjacent channels	The ratio of transmission power in adjacent channels to in band transmission power≤-45dB, satisfy the transmission power within adjacent channels≤13mW.
13	Transmission power outside adjacent frequency channels	The ratio of the transmission power outside the adjacent channel to the in band transmission power is ≤ -60dB, or the transmission power outside the adjacent channel is ≤ 13mW.
14	Overall efficiency	≥35%
15	Overall energy consumption	<3KW
Note: Items 10, 12, and 13 should be measured after the filter, while the rest should be measured before the filter.

2) Local oscillator phase noise.
Table 2 Transmitter Phase Noise Index

No.	Offset center frequency (Hz)	Local oscillator phase noise (dBc/Hz)
1	10	< -60
2	100	<-75
3	1k	< -85
4	10k	< -95
5	100k	< -110
6	1M	< -115

1) Machine output interface: ф 40 direct feed 50 Ω.
2) Standard 19 inch cabinet, 570mm wide × 1565 mm high × 1050 mm deep.



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