LP 175
Low-Pass Filter for the 160 MHz Band
Description
- The LP 175 is a low-pass filter, which passes all signals in or below the 2 m-band (138 – 175 MHz) and rejects signals above this range.
- The LP 175 is used to prevent RFI (Radio Frequency Interference) caused by excessive harmonic-generation from transmitters operating in the 2 m band. By rejection, the filter reduces the amplitude of the harmonics and prevents them from being radiated by the antenna.
- The LP 175 has a very sharp rolloff between the pass band and the stop band while at the same time keeping a low ripple in the pass band.
- The use of extremely high-Q resonant circuits ensures that all of the attenuation is due to reflection and not dissipation, resulting in extraordinary low insertion loss and high power-handling capability.
- The filter is normally used in connection with base station transmitters, but as it is mechanically very ruggedly designed, it is also perfectly suited for mobile and marine applications.
- Materials used are brass and passivated steel and the filter is coated with black vinyl to prevent corrosion.