Variable?frequency combiner, its master hub unit (MHU) and radio remote unit (RRU)

The utility model provides a variable frequency combiner which comprises a variable frequency combiner master hub unit and a variable frequency combiner radio remote unit. The variable frequency combiner master hub unit comprises a first radio frequency interface, a first combiner interface and a first signal processing unit. The variable frequency combiner radio remote unit comprises a second radio frequency interface, a second combiner interface and a second signal processing unit. The first combiner interface and the second combiner interface are connected with each other through a video cable. After undergoing frequency conversion through the first signal processing unit, a radio-frequency signal inputted through the first radio frequency interface passes through the first combiner interface and video signal combiner and then is outputted; the radio-frequency signal is transmitted to the second combiner interface, passes through the second combiner interface and video signal shunt, and is outputted from t