The Kenwood LF-30A is a low pass filter designed to suppress harmonics and prevent TVI (television interferance). It has a cutoff frequency of 30 MHz, but passes RF from 1.9 to 28 MHz with little attenuation. Attenuation is more than 90 dB between 90 and 300 MHz. Maximum input power is 1000 watts PEP. Insertion loss is less than 0.5 dB at 30 MHz. Input and output impedance is 50 ohms. SO239 input and output. 9.6 x 1.97 x 1.57 inches. 1.2 lbs.