Introduction: The FM radio transmitter adopts a new digital FM broadcast exciter, high-efficiency RF power amplifier and high-reliability switching power supply, etc., to form a compact and superior cabinet-type 3KW FM radio transmitter in a modular manner. The machine adopts modular structure to facilitate maintenance and repair of the transmitter; it can also be configured with active and standby dual exciters to further improve the reliability of the whole machine. Features: 1. Modular design concept, each functional module adopts modular assembly for easy maintenance and repair 2. Main and standby dual exciter configurations can be used to reduce the off-air rate (alternative exciter and auto-switch are optional) 3. The 3KW power amplifier is installed in a 3U high 19-inch standard chassis. The inside is composed of four identical 1KW power amplifier modules for low-loss and high-isolation in-phase synthesis. The power redundancy design has large margin and high reliability. 4. 1KW power amplifier module uses the latest high-efficiency LDMOS tube, adopts microstrip impedance conversion technology, simple and efficient, good consistency, convenient maintenance and replacement. 5. The power amplifier radiator adopts the patented thermal simulation design tooth type, with small wind resistance, large heat dissipation area and high heat conduction efficiency. 6. Three imported high-quality long-life and large-volume axial flow fans are used in parallel, and the air volume redundancy is large. The single damage will ensure the normal operation of the whole machine. 7. The power amplifier power supply adopts high-reliability switching power supply, and adopts flexible N+1 hot-swap configuration scheme and parallel current sharing centralized power supply. Redundant configuration is also available upon request. 8. The switching power supply is protected by overvoltage, overcurrent, undervoltage, overtemperature, short circuit, phase loss and lightning protection. 9. The transmitter is equipped with VSWR, over power, over temperature, over voltage, over current and lightning protection. 10. The whole machine is installed in a 19-inch standard cabinet, and the height can be customized according to customer requirements. 11. The bottom of the cabinet is equipped with a universal roller to facilitate the movement of the equipment. 12. The technical parameters can be read through the touch panel of the CCU panel, which is intuitive and convenient. 13. Complete technical data detection, monitoring system and fully functional computer control software. 14. Power control adopts closed-loop automatic gain control to ensure stable output power without drift. 15. With TCP/IP and RS232 remote control interface, it is convenient for computer local management and remote monitoring. Technical Parameters: 1. RF frequency range 87MHz～108MHz Step 10kHz (other frequencies can be customized) 2. Output power 0~3000W continuously adjustable 3. Output power tolerance deviation <±10% 4. Output power stability <±3% 5. Output impedance 50Ω 6. RF output connector IF45 or φ40 direct feedback 7. RF efficiency 70% 8. Residual residual wave < -70dB 9. Higher harmonics < -65dB 10. Parasitic amplitude modulation < -50dB 11. Carrier frequency tolerance ±200Hz 12. Analog audio input -12dBm ~ +8dBm 13. Audio Level Gain -15dB~+15dB Step 0.1dB 14. Analog audio input impedance 600Ω balance 15. AES/EBU input impedance 110Ω balance card 16. AES/EBU input level 0.2~10Vpp 17. AES/EBU sampling rate 30kHz～96kHz 18. RDS Input Unbalance (optional) BNC type connector 19. Audio pre-emphasis 0μs, 50μs, 75μs 20. Frequency response ±0.1dB 30Hz～15000Hz 21. Left and right channel level difference <0.1dB (100% modulation) 22. Stereo resolution ≥50dB 30Hz～15000Hz 23. Stereo signal to noise ratio ≥70dB 1KHz, 100% modulation 24. Distortion <0.1% 30Hz~15000Hz 25. Power supply Three-phase four-wire AC 380V or single-phase AC 220V or two-phase AC 110V 26. Heat dissipation method Forced convection 27. Temperature range -5°C～+45°C 28. Chassis Dimensions (Standard Type) 19" Width (574mm) x Height (1000mm) x Depth (880mm) 29. Machine weight 150kg
Introduction: The FM radio transmitter adopts a new digital FM broadcast exciter, high-efficiency RF power amplifier and high-reliability switching power supply, etc., to form a compact and superior cabinet-type 3KW FM radio transmitter in a modular manner. The machine adopts modular structure to facilitate maintenance and repair of the transmitter; it can also be configured with active and standby dual exciters to further improve the reliability of the whole machine.
