The Filter-2 board is a module for the FM-27 receiver or the SCA-23 board. It consists of a four-pole lowpass filter. The characteristics are established by four capacitors and a resistor network. It can be configured for any standard design and cutoff. Normal configuration is Chebyshev, 1 db ripple, 3500 Hz.
It can be integrated into other systems that have a low output impedance and high input impedance.