300W FM Transmitter for FM Radio Station

Product Description

ZHC618F-300W Light FM Stereo Transmitter
1. Overview
ZHC618F-300W/LIGHT stereo FM radio transmitter is an integrated high-quality FM transmitter that stereo-encodes the input left and right channel audio signals and adjusts the FM modulation to the broadcast band, then RF amplify to the 1000W output power for wireless broadcasting. The transmitter adopts the most advanced software radio technology to achieve the international leading level of product performance indicators.
With a new large-scale field-programmable gate array (FPGA) and direct digital frequency synthesis (DDS) technology at up to 5G, the product achieves the highest technical specifications in the industry to date, providing listeners with a CD-like sound experience.
The product consists of audio interface unit, digital processing and frequency modulation unit, RF power amplifier unit, human-machine interface unit, communication interface unit, clock synchronization unit and power supply unit. The transmitter is installed in a 19-inch 2U standard chassis, intensive design, small size and light weight. The whole transmitter is designed with high reliability, which makes the product run continuously and stably for a long time.
2. Technical characteristics and principle block diagram
Product technology has the following technical features:
• Full process digital processing to achieve a perfect auditory effect of CD-like sound quality
• Full-scale digital processing with large-scale field-programmable gate array (FPGA) technology
• Direct digital frequency synthesis (DDS) technology at speeds up to 5G to peak transmitter specifications
• High reliability microprocessor (ARM) technology as the primary controller
• Support for multiple audio source inputs (transmitters can be automatically selected by priority):
AES/EBU digital audio signal input (highest priority)
Analog stereo analog audio signal input (2nd priority)
MPX stereo composite signal input (3rd priority)
• Supports one RDS or SCA subcarrier input
• Upgradeable to FM synchronous broadcast transmitter
• Electronically controlled AGC controls output power zero drift
• Perfect over-current, over-voltage, over-temperature, over-power, standing wave ratio alarm and protection
• One-touch shuttle quick keyboard input
• Real-time display of operating parameters using OLED
• With TCP/IP, RS232 communication interface
• 19-inch standard chassis, height 2U
The Transmitter Block Diagram:
3. Technical specifications
Electrical Specifications:
1. Frequency Range 87MHz~108MHz
(other frequencies can be customized), stepping 10kHz
2. Carrier frequency tolerance ±200Hz
3. Output power 0~300W continuously adjustable
4. Output power tolerance ±1dB
5. Output impedance 50Ω
6. RF output connector 7/16" or 7/8"
7. Residual wave radiation < -70dB
8. Parasitic amplitude modulation noise < -50dB
9. Pilot frequency deviation ±0.1Hz
10. 38KHz residual component in the S signal < -50dB
11. 100% modulation frequency offset ±75KHz
(maximum modulation frequency offset 112.5KHz)
12. Audio pre-emphasis 0μs/25μs/ 50μs/75μs optional
13. Signal-to-noise ratio ≥92dB (1kHz, 100% modulation)
14. Stereo separation ≥73dB (L → R, R → L)
15. Distortion ≤0.01% (30Hz ~ 15000Hz, 100% modulation)
16. Frequency response ±0.01dB (no emphasis, no de-emphasis);
±0.05dB (emphasis, de-emphasis)
17. Left and right channel level difference ≤0.01dB (100% modulation)
18. Analog audio input -12dBm ~ +8dBm
19. Analog audio input impedance 600Ω balance
20. AES input impedance 110Ω balance
21. AES input level 0.2~10Vpp
22. AES sampling rate 30kHz ~ 96kHz
23. RDS input impedance 10kΩ unbalance
24. RDS input level 0dBm
25. MPX input impedance 10kΩ unbalanced
26. MPX input level 1.0Vpp
27. Input audio Level Gain -15dB~+15dB Step 0.1dB
28. Heat dissipation method Forced convection
29. Power supply voltage 100VAC~265VAC/ 47Hz~63Hz
Physical Specifications:
30. Chassis standard 19" inch
31. Chassis size 2U (width 484mm × height 88mm × depth 500mm)
32. Total weight 19Kg (including packaging)
33. Operating environment temperature -10 ° C ~ +45 ° C
34. Relative humidity <95%
35. Altitude <4500m

1. Frequency Range	87MHz~108MHz
2. Carrier frequency tolerance	±200Hz
3. Output power	0~1000W continuously adjustable
4. Output power tolerance	±1dB
5. Output impedance	50Ω
6. RF output connector	7/16" or 7/8"
7. Residual wave radiation	< -70dB
8. Parasitic amplitude modulation noise	< -50dB

Company Information:
Common Problems:
Q1. What these equipments used for?
A1. We are original manufacturer in FM Radio & TV Broadcasting equipments; they are professional used for FM Radio & TV Broadcasting Station (Transmitting equipment.)

Q2. What equipment & solution your company can provide?
A2. We can do complete solution for FM Radio Station System. It includes:Studio--Link--Transmitter--Cables--Antenna.
We also can provide complete Transmitting part of TV Station. It includes:Link-Transmitter-Cables-Antenna.

Q3. How large areas can One Station cover?
A3. One FM or TV Station can cover one city or one town.
The Maximum cover ranges of one station can not over 100KM Radius because the Earth is Curve.
You can use Multiple Stations & Different Frequency to cover larger area.

Q4. How do I choose suitable equipments for my station?
A4. The most import factors are Power and Frequency.
We need to know the Power and Frequency you need exactly.
How long the distances do you want to cover in Radius?
How height your Antenna can be installed?

Q5. How to calculate Broadcasting equipment Cover Range?
A5. The Cover Range depends on 4 factors:1. Power from Transmitter; 2. Height of Antenna; 3. Gain from Antenna; 4. Around Environment.
Then we can know the cover range of your station.

Q6. Is the Frequency Adjustable?
A6. FM Radio Band Frequency is 87~108MHz, TV Band Frequency includes UHF/VHF band.
For FM Radio Transmitter; Power Below 2KW is all adjustable. Above 2KW would be narrow.
For TV Transmitter; all Frequency Band is very Narrow, only can contain around 3 Channels; so it's not adjustable.

Q7. Is your Analog TV Transmitter can be upgraded to Digital?
A7. Yes, we can. But the Frequency Band should be the same.
The only difference between Analog & Digital TV Transmitter is its TV Modulator.
After upgrade to Digital, the Power from TV Transmitter reduced 5 times.
For example: 1KW analog TV Transmitter can be upgraded to 200W Digital TV Transmitter.

Q8. How to do installation of these equipments?
A8. For small power station, the equipments are very easy for installation.
For large power station, we can send our engineer to your country to help you do the installation, but you should pay the cost.
We also can do training for your engineer here in our company.

Q9. How to operate these broadcasting equipments?
A9. We provide All-English user manual; All-English operation software in our equipment.
We also can do training for your engineer here in our company.

Q10. What about after sales?
A10. The warranty time is one year after goods leaving factory.
We can provide technical support from internet or in our company.
We can send spare parts to you directly when the equipment damaged.
Timmy
Hangzhou Zhongchuan Digital Equipment Co.,LTD
Address: Zone 1, Floor 5, Building 1, Delixi Yunqi Innovation Center, Zhuantang Street, Xihu District, Hangzhou,310024,China

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