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Two Simple Low Pass Filters for 145 - MHz Band

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ANTENTOP- 01- 2018 # 022

Two Simple Low Pass Filters for 145- MHz Band

 

 

 

Figure 6 Return losses of the Low Pass Filter for 145- MHz Band at frequencies 200- 500- MHz

 

 

Figure 7 Attenuation for the Low Pass Filter for 145- MHz Band at the 2- meter Band

 

Best result for tuning the filter will provide a Spectrum Analyzer. In this case the tuning may take just 20 minutes. At first step the filter is tuned for low SWR. At this step only horizontal inductors are adjusted by pressing/ stretching. The second step is adjusted the filters for rejection of the second harmonic- 288- MHz.

After that again check the SWR (and adjust if it is needed) of the filter then turn on the filter in revers (where was the filter's input- now is the filter's output) and check SWR once more time and adjust inductors if it is needed.

 

 

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Last Updated:

January 3, 2020 21:06

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