ZHC618F-5000W FM Transmitter

Overview

This 5KW FM stereo transmitter (4 pieces hot-plugin modules) is a high-performance broadcast grade stereo FM radio transmitter used for wireless coverage of professional radio stations. In order to improve the reliability of the transmitter, in terms of design concept, the transmitter adopts redundant design in key parts to achieve long-term stable operation of the transmitter. Due to the use of hot-plugin structure, the components of the transmitter can be repaired and restored without stopping the machine.

Features

1. Large output power surplus: efficiently synthesized from 4 pieces 1.5KW hot-plugin modules, with a maximum output of 5.5KW.

2. High work efficiency: Using the latest high-efficiency LDMOS amplifier tubes, the maximum RF efficiency at full power can reach over 70%.

3. Stable output power: Intelligent automatic power control technology (AGC) is adopted to ensure that the output power does not change with the start-up time and environmental temperature, and the power stability is controlled within 10W.

4. Low useless transmission: Equipped with high-performance cavity output filters to minimize useless transmission to the greatest extent possible.

5. High power reliability: 4 pieces 3.6KW hot-plugin switch power supplies are used in parallel with N+2 current sharing power supply, providing a large amount of power capacity surplus.

6. Dual exciter configuration: Adopting dual exciter intelligent automatic switching (spare exciter and switch are optional), which can further improve the reliability of the entire machine.

7. Digital FM exciter: Optional with our latest technology of fully digital ultra CD grade 5G FM exciter, dual channel digital audio signal (AES/EBU), FPGA+DDS software radio coding modulation, the listening effect has reached CD grade. Other high-quality exciters can also be selected for use.

8. Friendly user interface: adopting an 8-inch true color touch LCD display screen, real-time display of various working parameters of the transmitter (including the current of each amplifier transistor); No training is required, it can be operated under the on-screen prompts.

9. Complete protection functions: with over power protection, excessive reflected power protection, over temperature protection, over-voltage protection, and over-current protection; And it can intelligently adjust the output power when some power amplifier modules fail, maintaining maximum safe power broadcasting while ensuring that the fault does not escalate.

10. Good dustproof performance: All air inlets are equipped with high-quality filters that can filter out dust in the air to extend the average time between failures of the transmitter.

11. Excellent lightning protection performance: Adopting internationally renowned brand lightning arresters to provide lightning protection for AC power input.

12. True hot-plugin function: Under any circumstances, the power amplifier module and power module can be plugged in and out without stopping the machine, making it easy to repair and restore the transmitter.

13. Timed automatic adjustment of output power: The transmitter can be set to automatically adjust the output power at different times of the day, bringing convenience to the economic operation of the radio station.

14. Advanced remote control and telemetry interface: Access any parameters inside the transmitter through RS232/RS485 or TCP/IP network interface.

5KW Hot-plugin FM Transmitter Diagram

Hot-plugin Amplifier Diagram

Technical Specifications

1. RF frequency range:             87MHz~108MHz

with a step frequency of 10kHz (other frequencies can be customized)

2. Output power       0-5KW continuously adjustable

3. Allowable deviation of output power ＜±10%

4. Output power stability     ＜±3 ‰

5. Output impedance       50Ω

6. RF output connector      EIA 1-5/8” flange or φ40 direct feed

7. Residual wave radiation     ＜-80dB

8. Parasitic amplitude modulation  ＜-55dB

9. Allowable deviation of carrier frequency ±200Hz

10. Analog audio input       -12dBm~+8dBm

11. Audio level gain         -15dB to+15dB, step by 0.1dB

12. Analog audio input impedance  600Ω balanced Canon

13. Digital audio input impedance  110Ω balanced Canon

14. AES/EBU input level      0.2-10Vpp

15. AES/EBU sampling rate    30kHz~96kHz

16. SCA/RDS input        BNC type connector

17. Audio pre-emphasis      0μs, 50μs, 75μs

18. Frequency response      ±0.05dB 30Hz~15000Hz

19. Level difference between left and right channels ≤0.01dB (100% modulation)

20. Stereo separation       ≥70dB 30Hz~15000Hz

21. Stereo signal-to-noise ratio  ≥90dB 1KHz, 100% modulation

22. Distortion           ≤0.01% 30Hz~15000Hz

23. Heat dissipation method   forced convection

24. Temperature range      -5℃ to +45℃

25. Altitude           ≤4500m

26. Chassis standard 19 inches  wide (570mm) x high (1565mm) x deep (1050mm)

27. Total weight         270Kg

Other technical indicators meet the requirements and measurement methods of GY/T 169-2001 "Technical Requirements and Measurement Methods for Meter Wave FM Broadcast Transmitters"