This type of filter circuit is a bandpass filter for FM band 88-108 MHz. This bandpass filter is in fact a combined highpass and lowpass filter. The first stages are a high pass and the last stages a low pass. We ripped it out the newsgroup alt.radio.pirate too bad, we can't remember who posted it. We tested the schematic with a simulation in MicroSim PSpice A/D Analog/Digital Simulator, Version 6.2 - April 1995. You find the output on this page.
This is An overview with PSpice from 10 MHz to 400 Mhz :
An overview with PSpice from 70 MHz to 150 Mhz looked like the next picture. Too bad PSPice didn't interpolate the points more detailed, this is why the curve is angled and not bowed!
Source: FM Bandpass Filter 97.5 MHz
See more : Audio Video Modulator - FM Transmitter - Ring FM Antenna
This is An overview with PSpice from 10 MHz to 400 Mhz :
An overview with PSpice from 70 MHz to 150 Mhz looked like the next picture. Too bad PSPice didn't interpolate the points more detailed, this is why the curve is angled and not bowed!
Source: FM Bandpass Filter 97.5 MHz
See more : Audio Video Modulator - FM Transmitter - Ring FM Antenna
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