rf splitter 3 way.RF duplex isolation degree

　　The consideration of attenuation at the transmitting end is to ensure that in the case of strong received signals, the received frequency signal does not produce intermodulation interference on the transmitter. Generally, the requirement can be met when the isolation degree is above 60dB. The consideration of attenuation at the receiving end should be sufficient to prevent the power output from the transmitter to the antenna from interfering with the normal operation of the receiver at the input end. Therefore, the receiving channel of the RF duplex is a bandstop filter corresponding to the overall transmission rate. We know that the transmission power of the transfer station is above 25W, while the receiving sensitivity is around 0.35UV. As an example, in the RF duplex's transmission and reception channels, the difference in voltage levels between the two is about 145dB. For transfer stations with higher power and higher reception sensitivity, the difference is even greater. In order to avoid affecting the normal operation of the receiver due to transmission power, a certain amount of attenuation of transmission power should be applied at the input of the receiver. Generally speaking, except for a few special frequency points, the parasitic immunity of the receiver is above 80dB. Of course, different types of transfer stations may vary. Therefore, before considering the selection of RF duplexers, the parasitic immunity of the wireless telephone should be tested, especially on the frequency points of the transmission rate, and a detailed understanding should be conducted to determine the RF duplexer index. From the above example, it is required that there should be at least 145-80=65dB attenuation at the frequency point corresponding to the transmission rate in the receiving channel of the RF duplex to basically meet the requirements. For transfer stations with high power and sensitivity, larger attenuation is required, generally above 80dB

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