LPF-100 FM Stereo Composite Low Pass Filter

The LPF-100 FM Stereo base band low pass filter effectively reduces spectral noise caused by noisy STL paths, stereo generator anomalies, and aggressive processing techniques. Low noise means a cleaner mask, which is increasingly important in today’s digital world. The LPF-100 provides effective reduction of interference to SCAs. The LPF-100 is a tenth order, linear phase electronic filter that is designed to reduce base band noise levels while not materially affecting stereo performance or modulation depth. 

The LPF-100 can be used when noise from studio to transmitter links, processing equipment or stereo generator anomalies interfere with SCA performance or where noise levels are high enough to induce multi-path-like effects in received signals. The experts will tell you that the best low pass filter is a linear phase filter that offers good step response, low ripple in the pass band and little non linear group delay in the pass band. These are essential characteristics of an FM stereo path for good stereo performance. Poor phase response results in poor stereo separation due pilot phase error. Poor amplitude balance causes cross talk between main and sub channels resulting in poor stereo separation. The LPF-100 offers minimal group delay error and good pass band amplitude response. Phase and amplitude errors are within the correction range of most modern stereo generators. Because the LPF-100 has low overshoot, it doesn’t rob your station of modulation. What you get in return is reduced base band noise resulting in better SCA performance and low cross talk.

Technical Specifications Data Sheet (Adobe PDF)

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