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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

 

 

Two Simple Low Pass Filters for 145 MHz Band

 

 

 

Anatoli, RL1L

ex. (RA0C, EY9AF, RA6XPL, RA6PS, RA6PGY)

 Credit Line: Forum at www.cqham.ru

 

 

A Low Pass Filter is recommended to use in a Field Day operation when several amateur radios that work at 145 and 430- MHz are placed close to each other. In this case the third harmonic of the 145- MHz radio (when it transmits) may cause interferences for 430- MHz radio.

 Schematic of a simple Low Pass Filter for 145- MHz Band is shown in Figure 1. The filter made on a piece of two sided PCB. Capacitors of the filter are created on the board by the foil. Figure 2 shows design of the filter. Figure 3 shows view of the filter. Figure 4 shows layout of the capacitors.

 

The capacitors made on a PCB that has thickness in 1.5- mm. However different PCBs depend on the stuff and the thickness may have another capacity per square centimeter. It is very useful to find the capacity per square centimeter and re-calculate (if it should be done) the sizes of the capacitors before the capacitors would be made.

 

 

 

Figure 1 Schematic of a simple Low Pass Filter for 145- MHz Band

 

 

Figure 2 Design of the simple Low Pass Filter for 145- MHz Band

 

 

 

Figure 3 View of the simple Low Pass Filter for 145- MHz Band

 

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January 3, 2020 21:02

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