Dry goods! Poor electrical parameter analysis and maintenance

To sum up, some practical personal maintenance experience of the maintenance staff at the frontline for many years, it may not look gorgeous, it does not necessarily contain a profound theoretical knowledge, but I found it really useful

Including but not limited to the following, the filter commonly used electrical parameters of poor analysis VS repair methods.

Poor electrical parameter analysis and maintenance
Defective item	Influencing factors	Solution
Bad insertion loss	Design factors	Design as much spare time as possible
Material reason	Improve the performance of critical materials such as connectors and resonators, including plating, intermodulation, dimensions, roughness, and more
Debugging method	Debug all indicators to optimum
plating	Increase plating thickness
Instrument error	Calibration to improve the accuracy of the instrument
Test factor	Improve the accuracy of the test bench itself; Minimize the error of test methods as much as possible
Coupling plate	Optimize microstrip line design; optimize coupling between the coupling plate and the main bar; reduce coupling.
Out of band	Design reason	Design as much spare time as possible
Low-pass reason	Whether the low-pass cover is tightened and re-tightened again; Improve the dimensional accuracy of the low-pass groove, and strictly control the size within the required range; Blow the heat shrink tube again.
Leakage of the cover	Raise the flatness and roughness of the cavity and the main cover plate; Screw tightening torque increases; Re-tighten the cover again.
Poor return loss	Design reason	Design as much spare time as possible
Material reason	Improve the performance of critical materials such as connectors and resonators, including plating, intermodulation, dimensions, roughness, and more
Debugging method	Debug all indicators to optimum
Instrument error	Calibration to improve the accuracy of the instrument
Test factor	Improve the accuracy of the test bench itself; Minimize the error of test methods as much as possible
Tap line	Ensure that the tap height; Ensure the distance from the tap line to the cavity wall.
Lightning protection board	Improve the isolation of the lightning protection board; Optimize microstrip line design.
Bad high and low temperatures	Seal leakage	Improve the airtightness of the chamber and prevent water ingress

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