Rotation type adjustable step attenuator, preparing technique, and application

Abstract

Characters of the attenuator are that positional mechanical structure is installed on a rotating shaft; right part of the rotating shaft is sheathed by shell coaxially; in cavity of shell at left part, up printed plate passing through axle center is connected to 0-15dB resistance attenuation network (RAN) installed according to certain angle along radius direction evenly; pins and spring nose spikes are installed on the low printed plate; nose spikes are contacted to bonding pad of electrical contacts on bottom of RAN on the up printed plate. When handle is rotated, each step of attenuation value is led out from three contacts of spring nose spikes so as to form 0-15dB sixteen different attenuation values. Fabricating procedures include: making dies of shell and rotating shaft; producing plastic parts; and assembling parts. Features are: novel structure, small size, complete functions etc. The attenuator is applicable to wire broadcasting and TV, communication network system etc.

Description

[technical field] [0001] The invention relates to a passive attenuator, in particular to a rotary adjustable step attenuator and its preparation process and application. [Background technique] [0002] Passive attenuators commonly used in CATV systems can generally be divided into two types: [0003] 1. Fixed attenuator; [0004] 2. Variable attenuator. [0005] The reason why passive attenuators are widely and widely used is that compared with active attenuators (active attenuators usually use PIN tubes or ICs), they have low insertion loss, good impedance matching, simple operation, and no external The hardware control circuit or software control program is easier to replace, there is no nonlinear distortion when the signal is large, and the price is lower. [0006] Fixed attenuators have the advantages of clear and intuitive attenuation values ​​and stable values. However, an attenuator can only have one definite attenuation value. If it wants to cover all commonly use...

AI Technical Summary

Problems solved by technology

[0004] 2. Variable attenuator

[0006] Fixed attenuators have the advantages of clear and intuitive attenuation values ​​and stable values. However, an attenuator can only have one definite attenuation value. If it wants to cover all commonly used attenuation values ​​(such as 0 to 15dB), it must have 16 different values. The attenuator, which causes inconvenience in production, sometimes cannot find the required attenuation value because there are not enough spare parts when the equipment is debugged on site, which is its shortcoming

[0007] The variable attenuator has the advantage of continuously adjusting the attenuation value, but the attenuation value cannot be directly displayed, and the required value must be obtained through calculation with the help of an instrument

And its internal carbon diaphragm is easy to wear after frequent rotation and may cause numerical instability, which is its shortcoming

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