A Frequency Calibration System of Electric Duplexer

Abstract

The invention discloses an automatic frequency calibration system for an electric duplexer, which relates to the field of microwave communication. The system includes a frequency calibration unit, a first switch, a second switch, a generator filter, a receiver filter, a circulator, a radio frequency self-circulator, and a low-noise amplifier; the frequency calibration unit performs frequency conversion amplification and filtering on the received signal , the filtered signal is sequentially sampled, compared, judged and counted. After reaching the preset threshold, the output sends the specified frequency to the generator filter or outputs the specified frequency to the receiver filter. The invention cooperates with the frequency calibration unit and the switch to make the electronically adjustable duplexer realize automatic frequency calibration, which has the characteristics of intelligence and high degree of automation; the combination of electromechanical, soft and hard, can automatically change the calibration working frequency in a wide frequency range ; The tuning speed is fast, and the accuracy and stability of the duplexer's operating frequency are maintained in high and low temperature environments; it is a highly versatile and highly integrated automatic frequency calibration system for electronically tuned duplexers.

Description

technical field [0001] The invention relates to an automatic frequency calibration system for a microwave electric duplexer in the communication field, which can quickly and accurately change the frequency of the electric duplexer, and is especially suitable for high-frequency and wide-band communication equipment. Background technique [0002] The Chinese utility model patent with the patent number CN201320615583.X in the prior art discloses "a C-band electronically adjustable duplexer". The currently used electronically adjustable duplexer only uses a set of fixed calibration data at room temperature. The data is stored in the single-chip microcomputer, and the stepping motor of the electric tuning filter is controlled by the single-chip microcomputer to change the frequency of the electric tuning filter. Due to changes in vibration and ambient temperature, the center frequency deviates, and the ESC filter does not have frequency self-test capability, so it cannot determin...

AI Technical Summary

Problems solved by technology

Due to vibration and changes in ambient temperature, the center frequency deviates, and the ESC filter does not have frequency self-test capability, so it cannot determine whether the frequency is accurate, so it cannot self-recover the original frequency, which affects the normal operation of communication equipment

Images