A ku-band dual-polarization dual-output tuner

Abstract

The invention discloses a KU wave band dual polarization dual output tuner which comprises a feed source, a circuit board box of a built-in circuit, two connectors arranged on the circuit board box and a waveguide connected between the feed source and the circuit board box and used for transmitting a signal. A circuit board box cover is further arranged on the circuit board box, a first-stage high frequency amplifying circuit, a second-stage high frequency amplifying circuit, a filter circuit, a crystal oscillator circuit, a frequency converting output circuit, a control circuit, a three-end voltage stabilizing circuit and the like are arranged on a circuit board, a phase lock circuit with a single 25MHZ crystal oscillator circuit and two combined frequency converting ICs are adopted to enable an output signal to synchronously keep constant with a reference input signal in terms of frequency and phases, performance is stable, and performance is stable. The circuit board is designed into the KU wave band dual polarization dual output tuner formed by a piece of circuit board by means of the advantage that the highly integrated chip enables the circuit board to be simplified.

Description

technical field [0001] The invention relates to a receiving device for KU-band radio frequency satellite signals, in particular to a KU-band dual-polarization dual-output high-frequency head for receiving digital satellite TV signals. Background technique [0002] The tuner is a digital satellite TV signal receiving device. It can perform channel selection, signal amplification and frequency conversion processing, and finally output a stable TV signal. There are several links in this are very important. To make the output signal of the tuner in The frequency and phase are synchronized and consistent with the reference signal, which is usually completed by the control circuit of the circuit board, the triode and the oscillating frequency circuit composed of the DR. Its specific operation is: when in use, it is necessary to manually adjust the tuning screw. The frequency of the local oscillator signal generated by the oscillation frequency circuit is changed by the interval, a...

AI Technical Summary

Problems solved by technology

[0002] The tuner is a digital satellite TV signal receiving device. It can perform channel selection, signal amplification and frequency conversion processing, and finally output a stable TV signal. There are several links in this are very important. To make the output signal of the tuner in The frequency and phase are synchronized and consistent with the reference signal, which is usually completed by the control circuit of the circuit board, the triode and the oscillating frequency circuit composed of the DR. Its specific operation is: when in use, it is necessary to manually adjust the tuning screw. The frequency of the local oscillator signal generated by the oscillation frequency circuit is changed by the interval, and then the frequency and phase of the output signal are adjusted by controlling the local oscillator frequency through the control circuit to achieve the purpose of locking the output signal. The vibration frequency is very high, and it is easy to be affected by the change of the external environment temperature, which will cause thermal expansion and contraction of the components of the high-frequency head, resulting in a change in the distance between the tuning screw and the DR, thereby changing the local oscillator frequency generated by the oscillation frequency circuit, making it The frequency offset cannot make the output signal of the tuner consistent with the reference input signal, which will eventually affect the normal operation and service life of the tuner

[0003] In addition, the current KU-band dual-output tuner is assembled by connecting multiple circuit boards through multiple connecting pins, which has defects such as complex wiring, poor polarization isolation effect, cumbersome production, and high production cost.

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