technology knowledge

How to determine the appropriate type of transmitter?

1) You first need to determine the purpose of the transmitter, whether it is for broadcasting and television stations to transmit signals or for scientific experiments or other purposes.
2) At first you can determine the radio and television wireless transmitters whether to transmit analog television, FM radio, or digital television signals.
3) For Simulate TV transmitters, generally with output power levels ranging from 100W to 30KW or higher, and frequency bands typically VHF or UHF. It is necessary to inform the manufacturer of the basic parameter requirements for output power, frequency channels, standards, and power supply. At present, we can provide standards such as PAL-K/PAL-D/SECAM/NTSC, and the power supply and interface can be customized according to customer requirements.
4) For digital TV transmitters typically have an output power ranging from 50W to 7KW, with frequency bands including VHF or UHF, and the usage frequency needs to be specified. Designed for full broadband in the UHF band. At present, we can provide DTMB/DVB-T/DVB-T2 standards. Cooling methods include air cooling and liquid cooling, which can be customized according to customer requirements.
5) For FM radio transmitter (analog), with output power generally ranging from 100W to 20KW, mainly in the FM band, 87-108MHz, designed for full broadband. The cooling method is mainly air cooling. Supports analog signals and AES/EBU signals, with RDS/SCA input.
6)For digital audio broadcasting transmitter (FM frequency band), with an output power generally ranging from 100W to 10KW, operating in the FM frequency band, designed for full broadband, and mainly air-cooled. Supports digital to analog signal input, including AES/EBU, L/R, ASC, and IP input methods.
7) For solid state power source, with a frequency of up to 3.9GHz and a power of up to 30KW, equipped with pulse and analog signal inputs, and cooling options including air cooling and liquid cooling. Supports total reflection and can be designed for automatic maintenance of robotic arms according to usage requirements.
6)For HF transmitter, frequency 30MHz~80MHz, supports pulse and analog signals, can be designed as multi-channel equipment.
In addition, the required equipment needs to specify the usage environment, such as indoor or outdoor type, remote monitoring interface requirements, etc.

What are the main technical parameters of the broadcast transmitter?

The general technical specifications of the transmitter include rated output power, operating frequency, operating voltage and frequency, modulation mode, etc. According to different types of transmitters and the technical standards they meet, there are corresponding international, national, or industry standard requirements. When ordering equipment, customers need to specify these requirements and make special notes on special requirements such as equipment size, outlet, cooling method, power supply, etc.

How to reduce the working noise of the transmitter

A transmitter is an electronic power amplifier device that operates continuously for a long time. Its main RF components consume a large amount of heat during operation and require a good heat dissipation method to operate stably. Usually using air cooling or liquid cooling methods, liquid cooling has lower noise but higher system load costs, making it suitable for special needs and high-power or ultra high power equipment. Air cooling is a commonly used cooling method, and the main component, the cooling fan, produces significant noise during operation. To reduce work noise, the transmitter design will first strive to improve overall efficiency and reduce heat consumption; Secondly, at the starting point of the fan.

How to improve the efficiency of the transmitter?

The working efficiency of the transmitter directly affects the overall power consumption, energy saving, and many other aspects of the transmitter design. How to further improve the overall efficiency of the machine is also a topic that technicians have been researching, such as using Doherty RF amplification technology, high conversion efficiency switching power supplies, reducing the connection and insertion losses of RF output links and components, and improving effective output power.

What are the monitoring methods for transmitters and how to choose the control software for unmanned stations?

There are various monitoring methods for transmitters, mainly divided into local monitoring and remote monitoring. Local monitoring is a real-time monitoring of the transmitter’s working status and various technical parameters through the transmitter’s touch screen, and can be set and operated accordingly. Remote monitoring mainly uses limited or wireless methods to monitor and control the working status and technical parameters of the transmitter in real time through computers, mobile phones, or other wireless communication terminal devices, including IP、 GPRS、 Wireless WIFI, etc.