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LP 175

Low Pass FiltersLP 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.

Specifications

Electrical
Model LP 175
Frequency Pass band: 0 - 175 MHz
(nominal): 138 - 175 MHz
Max. Input Power 150 W
Pass Band Insertion Loss 0.5 dB
Attenuation 270 - 320 MHz > 50 dB
Attenuation 321 - 360 MHz > 70 dB
Attenuation 361 - 800 MHz > 80 dB
Attenuation 801 - 1100 MHz > 60 dB
Application Low-pass filter for the 2 m band
1 dB Cut-Off Frequency > 180 MHz
VSWR < 1.5:1
Mechanical
Connection(s) N(f)
Dimensions 155 x 72 x 52 mm / 6.1 x 2.8 x 2.0 in.
Weight Approx. 0.41 kg / 0.90 lb.
Environmental
Operating temperature range -30 °C to +60 °C

Diagram and Mounting

TYPICAL RESPONSE CURVES

MOUNTING DETAILS

Ordering Designations

Model Product No.
LP 175 N(f) 200001274

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