Directional antenna

SKM-21
 
Antenna amplifier distribution system:
The antenna amplifier is a UHF antenna distribution system with amplifying function, covering the 400-900MHz radio frequency band. It can expand the function of the wireless microphone system by splitting the antenna to a 10-channel wireless receiver. It is divided into four DC power supply ports for output, each output is 12V1.0A. The front panel has a high-definition display to show the current working status. The integrated amplifier has 31 gain settings to compensate for different levels of coaxial cable signal loss. Adjust the transmission power to fully adapt to the comprehensiveness of various occasions. The maximum transmission power of 31DB can enhance the transmission signal to a distance of 500 meters. It can also amplify RF signals to compensate for the insertion loss caused by distributing signal power to multiple output connectors. Each allows up to four receivers to use the same pair of antennas. The stage connector can be connected to the fifth receiver or the second antenna splitter, and is compatible with all wireless microphone receivers operating in a compatible frequency range. The log-period dipole array is used to provide the best reception effect when facing the required coverage area. The machine can be fixed on the microphone stand, it can also be hung on the ceiling, or fixed on the wall with an integrated rotatable stand.
 
System functions
● Expansion capabilities. UHF antenna distribution system is specially used for large UHF wireless systems. The splitter allows four wireless receivers to use the same two antennas.
● Cascade port. Two 50QBNC antenna cascade ports can be connected to an additional splitter or a fifth wireless receiver. The wireless system can work with a pair of antennas. Power output and output connectors. At most, it can be chained (5 sets) 1 to 2 receivers on the power output, and power is supplied from a single power supply through the power output connector.
●Low noise and intermodulation distortion. Able to maintain a clear signal with the lowest distortion.
●Insertion loss compensation. When splitting the signal into multiple output ports, the signal strength will be attenuated. The signal can be amplified and compensated to ensure that the receiver provides a strong signal.
●Front side-install the antenna. The hardware required to install the antenna on the front side is included.
 
characteristic
●The low noise signal amplifier can compensate the insertion loss of the coaxial cable.
●Compatible with wireless receivers and antenna distribution systems, and can provide 10-15V DC bias.
●The threaded integrated bracket can be easily fixed to the microphone bracket.
●31 gain selection switch.
●High quality, high reliability and durability.
 
Directional antenna placement
When fixing the directional antenna, pay attention to the following items:
●The directional antenna and the receiver must use the same frequency band. The directional antennas should be fixed at least 10m away from each other.
Adjust the position of the directional antenna so that the transmitter has no obstacles (including the audience) in the line of sight.
●Keep the directional antenna away from large metal objects or reflective mirror objects.
Important note: Before using the wireless system for lectures or performances, perform a walk around test to check the signal coverage. Experiment with various placement effects of directional antennas to find the best placement position. "Blind spots" should be marked according to the actual situation, and the speaker or performer should be prompted to avoid these areas.
 
Gain setting
The gain can only be set to compensate for the cable signal loss obtained by calculation. Higher signal gain cannot achieve better RF performance. Excessive gain will actually reduce the receiving range and the number of available channels. This is because when the sum of signal gain and cable loss is equal to 0 dB, a high-quality product receiver can provide the best performance. If the gain is greater, it will only amplify all signals in the radio frequency range, which also includes interference signals and environmental radio frequency noise. Therefore, it cannot effectively and selectively increase the signal of the transmitter.
●According to the data displayed on the receiver's RF indicator or level meter, use the lowest gain setting that can obtain the best RF signal reception from the transmitter.
●The calculated cable loss can only be compensated by increasing the gain setting.
●For applications where the cable length is less than or equal to 50m and the distance between the transmitter and the directional antenna is less than 100m, the -6 dB gain setting should be adopted.
●If the RF Overload indicator of the directional antenna is on, the gain should be reduced (the signal is strong enough, so there is no need to set the gain).
The recommended gain setting is when the distance between the directional antenna and the transmitter exceeds 200m, the gain value should be set in the data table below according to the different cable types.
Note: For installations where the distance between the directional antenna and the transmitter is less than 150m
In case, the gain setting should be lowered by-gear.
 
Each system includes the following supporting components:
●Antenna Distribution System Host
●Install the hardware rack:
●Install the hardware surface
●Front side-install antenna hardware
●Power cord switching power supply DC-12V~18V 3A
●The antenna cable used for the receiver connection can ensure the maximum sensitivity and signal processing capability, and can provide the widest range of radio frequencies for many wireless receivers. To take full advantage of the functions of this system, please follow the guidelines below:
●If you use an extension cord for an antenna installed at a remote location, you should use a series radio frequency amplifier remote antenna extension cord, which can achieve low loss within the UHF operating frequency.
●Place multiple transmitters 3 meters [10 feet] away from the receiving antenna.
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