This lowpass filter circuit is a very basic filter. It required to remove the harmonic frequency content of the transmitter and can be used on frequency 1.8 - 145 MHz.
The cut off frequency of the filter can be achieved by making C2 and C4 variable trimmer acurate filtering. All coils are 22 SWG wound on 10mm Air former spaced at 2mm.
For making coils of the lowpass filter, download this RF Calculation Software and the list of Wire Gauge below.
Source: Ajpotts
See more: FM Transmitter
The cut off frequency of the filter can be achieved by making C2 and C4 variable trimmer acurate filtering. All coils are 22 SWG wound on 10mm Air former spaced at 2mm.
Source: Ajpotts
See more: FM Transmitter
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