ZHC518A-50W～100W/C2 Analog TV Transmitter
Overview:
This TV transmitter is a high-standard, broadcast-grade integrated all-solid-state analog TV transmitter. It adopts new software radio technology to realize TV modulation function; it adopts international high-quality LDMOS high-power field effect tube to realize RF amplification, and the output power can be selected according to needs, which are 50W / 100W.
The TV transmitter is mainly composed of a television modulation unit and a radio frequency power amplification unit. Among them, the TV modulation unit adopts a new FPGA + DDS to implement software-based TV modulation function, which guarantees reliability and performance consistency while obtaining superior technical indicators; the RF power amplifier unit uses international high-quality LDMOS high-power FETs, and the Analog/Digital Compatible, stable and reliable work.
The whole transmitter uses a 19 "standard stainless steel case, which is suitable for TV stations of all levels.
Features:
● It adopts new FPGA + DDS technology to realize software-based TV modulation function, with superior performance, high reliability and good consistency.
● It adopts the integrated structure design, and the single-channel image sound combination type is easy to install and use.
● It has the functions of no video, excessive standing wave ratio, over power, over voltage, over current, and over temperature protection to reduce equipment damage.
● With intelligent network management and monitoring, with RS232 and TCP / IP communication interfaces.
● It’s using high-quality switching power supply, with over-voltage, over-current, under-voltage, over-temperature, short circuit, lightning protection and other protection measures, high efficiency, good voltage regulation range, strong ability to adapt to external power changes.
● It adopts high-quality high-flow axial flow fan, with good heat dissipation effect, keep the transmitter in a low temperature state, and extend the life of the transmitter.
ZHC518A-50W～100W/C2 Analog TV Transmitter Diagram
Technical Specifications:
Overall performances:
1. Operating frequency band: VHF / UHF
2. Image carrier frequency deviation: ± 300Hz
3. Output power: 50W / 100W
4. Output impedance: 50Ω
5. Inter-modulation distortion: ≤-50dB
6. Useless emission: ≤-50dB inside adjacent channels;
≤-65dB outside adjacent channels
7. RF output interface: N-50KF
8. Power supply: single phase 220VAC / 110VAC
9. Cooling method: forced air cooling
10. Working environment temperature: -10～＋45 ℃
11. Dimensions: 483mm(width) x 88mm(height) x 500mm(depth)
12. Weight: 16Kg
Image performance:
1. Video input level: 1VP-P positive polarity
2. Video input impedance: 75Ω
3. Video in-band reflection loss: ≥35dB
4. Video input interface: BNC-K
5. Periodic clutter signal-to-noise ratio: ≥55dB
6. Continuous random wave SNR: ≥60dB (weighted),
≥55dB (un weighted)
7. Group delay: ± 30ns
8. 2T square wave distortion: ≤1%
9. Distortion of brightness waveform: ≤1.2%
10. Non-linear brightness distortion: ≤3%
11. Differential gain DG: ≤±3%
12. Differential phase DP: ≤±3 °
13. Color / bright gain difference: ≤1%
14. Color / bright delay difference: ± 5ns
15. Modulation degree: ≤87.5%
Sound performance:
1. Sound / image carrier power ratio: -10dB
2. Sound carrier frequency deviation: ± 200Hz
3. Audio input level: 0dBm ± 6dBm
4. Audio input impedance: 600Ω balanced or 10KΩ unbalanced
5. Audio input interface: XLR-K / BNC-K
6. Sound modulation capability: > ± 100KHz
7. FM signal-to-noise ratio: ≥70dB
8. Amplitude-frequency characteristic: ± 1dB
9. AM noise (no modulation): ≤-55dB
10. Internal carrier noise (100% modulation): ≤-50dB
11. Harmonic distortion: ≤0.3%
12. Maximum frequency deviation: ± 50KHz
13. Pre-emphasis time constant: 50us
