Procom LP 175 - Manual

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 passband and the
stopband while at the same time keeping a low ripple in the passband.
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 as well.
Materials used are brass and passivated steel, and the filter is black vinyl
coated 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
Stop band: 300 - 1400 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 - 1100 MHz > 90 dB
ATTENUATION 1101 - 1400 MHz > 60 dB
MECHANICAL
TEMP. RANGE –30° C → +60° C
CONNECTORS N-female
DIMENSIONS (L x W x H) 155 x 72 x 52 mm
WEIGHT Approx. 410 g
MOUNTING DETAILS
TYPICAL RESPONSE CURVES
PROCOM A/S reserve the right to amend specifications
without prior notice.
25/10/12