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LP 175

Low-Pass Filter for the 160 MHz Band

  • 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.

DESCRIPTION

  • 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.

ORDERING DESIGNATIONS 

TYPE PRODUCT NO.
LP 175 200001274

SPECIFICATIONS

ELECTRICAL  
MODEL LP 175
APPLICATION Low-pass filter for the 2 m band
FREQUENCY Pass band: 0 – 175 MHz
(nominal): 138 - 175 MHz
MAX. INPUT POWER 150 W
INSERTION LOSS (PASS BAND) ≤ 0.5 dB
1 dB CUT-OFF FREQUENCY > 180 MHz
ATTENUATION 270 - 320 MHz > 50 dB
ATTENUATION 321 - 360 MHz > 70 dB
ATTENUATION 361 - 800 MHz > 80 dB
ATTENUATION 801 - 1100 MHz > 60 dB
SWR < 1.5
MECHANICAL  
TEMP. RANGE –30° C → +60° C
CONNECTORS N-female
DIMENSIONS (L x W x H) 155 x 72 x 52 mm / 6.1 x 2.8 x 2.0 in.
WEIGHT Approx. 410 g / 0.9 Ib.

TYPICAL RESPONSE CURVES

MOUNTING DETAILS

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