ZHC518A-500W/C2 Analog TV Transmitter

Overview:

This Transmitter is a high-standard, broadcast-level all-solid-state Compact design analog TV transmitter. It uses a new software radio technology to achieve the TV modulation function; the use of international high-quality LDMOS high-power field effect tube to achieve radio frequency amplification, the output power can be 500W.

The TV transmitter is mainly composed of a TV modulation unit and an RF power amplification unit. Among them, the TV modulation unit uses the new FPGA + DDS to realize the software TV modulation function, while obtaining superior technical indicators while ensuring reliability and performance consistency; the RF power amplification unit uses international high-quality LDMOS high-power field effect transistors, Analog/Digital Compatible, stable and reliable.

The whole Transmitter adopts 19 "standard stainless steel case, suitable for all levels of TV stations.

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-500W/C2 Analog TV Transmitter Diagram

Technical Specifications:

Overall performances:

1. Operating frequency band:   VHF / UHF

2. Image carrier frequency deviation: ± 300Hz

3. Output power:              500W

4. Output impedance:         50Ω

5. Inter-modulation distortion: ≤-50dB

6. Useless emission:          ≤-50dB inside adjacent channels;

≤-65dB outside adjacent channels

7. RF output interface:       7/16” female

8. Power supply:             single phase 220VAC / 110VAC

9. Cooling method:           forced air cooling

10. Working environment temperature: -10～＋45 ℃

11. Dimensions: 483mm(width)x177mm(height)x650mm(depth)

12. Weight:                  35Kg

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