Reducing gain of narrowband of frequency spectrum while leaving surrounding audio unaffected, RNXF-37-15 Notch Crystal Filter allows between 2 and 5 notches with attenuation down to 70 dB with minimal ripple. Frequency range is 1 MHz to 60 N-MHz, while input and output impedance is 50 or 75 Ω. Providing output via pin or BNC/SMA connector, filter comes in 36 x 23 x 12 mm SMD package. Applications include satcom, radar, cellular phone infrastructure, microwave transmission, and more.