Support > Technical > How to Tuning to your Central Frequency (Fo)
How to Tuning to your Central Frequency (Fo)

The Tuning Steps:

1.Preparing the  PCB + SMA Connector as Test Fixture.

2.Processing the Calibration test as attached drawing.

3.Turning the both right & left screw with the same direction, 

    distance, angle and the numbers of times. The curve will 

    shift from the original Center Frequency to the one you want

4. Tuning all screws to left direction simultaneously in the same 

     distance, and then the Fo would move to high frequency

5. Tune all screws to right direction simultaneously in the same 

     distance, and then the Fo would move to low frequency

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For example ( Double Tuning Filter):

You can drive both right screw & left screw toward left direction

with each 0.5mm simultaneous, until you saw the NA reached at

895MHz.  When the performance S11 & S22 is the best & Return

 Loss is the biggest. A perfect performance is finished. 

(N/A: Network Analyzer)

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Pay Attention:
As you know, processing "how to tune the Filter" to match circuit 

on PCB is very important after the Helical Filter has been installed. 

The lamped-element of match circuit is always less tolerance. In order 

to match completely, you need to make adjustment by tuning the Filter. 

Note: 

If you tune only one screw to do the match adjustment, it is ˇ§incorrectˇ¨. 

Filter will loss its function by your incorrect tuning method.

The Expert of the RF Band Pass Filter design& manufacturer, RF Diplexer &Duplexer, RF 50 ohm& 75ohm Filter, RF Tunable Filter


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