| 摘要 |
PURPOSE: A multi-band base station system is provided to convert signals transceived between a base frequency rack and remote racks into base frequencies to transceive the base frequencies, and not to use other circuits for restoring lost parts, so as to prevent signal loss in lines and easily maintain the system. CONSTITUTION: A simultaneous frequency rack(400) modulates transmission signals applied from an exchange, and converts the modulated signals into base frequencies to output the base frequencies via many paths. The simultaneous frequency rack(400) is applied with receiving signals of many base frequencies to demodulate the receiving signals, and delivers the demodulated signals to the exchange. Many RF remote racks(500) are applied with IF transmission signals from the simultaneous frequency rack(400) to convert the applied signals into original RF frequencies, and deliver the RF frequencies to user terminals by amplifying and filtering the RF frequencies. The RF remote racks(500) convert frequencies of receiving signals of the user terminals into base frequencies, and apply the base frequencies to the base frequency rack(400). |
