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BPF 4/4-FM

Band Pass FiltersBPF 4/4-FM

Band-Pass Filter for the 88 -108 MHz Band

Description

  • The BPF 4/4-FM is a 4-helical resonator band-pass filter with aperture-coupling between the resonators.
  • This filter can be used as a preselector to protect a receiver against interference from transmissions out of the pass-band, or it can be used to reduce spurious output from a transmitter with up to 50 W of output power.
  • The BPF 4/4-FM version fits directly into our receiver multicouplers PRO-AR4G-N… etc.
  • The filter can be tuned within the entire 88 - 108 MHz band. It has very small dimensions owing to the use of helical resonators. Careful design and choice of materials ensure reliable operation over a wide temperature range.
  • The housing is made of extruded aluminium, the chassis of steel, and teflon insulation has been used in the coaxial cables and in the connectors.
  • The filter is black vinyl coated to prevent corrosion.

Specifications

Electrical
Model BPF 4/4-FM
Filter Type Band-pass filter
Frequency 88 - 108 MHz
Max. Input Power 50 W
Insertion Loss ≤ 1.4 dB (typ. 1.2 dB)
Impedance 50 Ω
Attenuation See curve
VSWR < 1.5:1
Bandwidth 3 - 4 MHz
Mechanical
Connection(s) N(f) or BNC (others on request)
Dimensions Approx. 165 x 104 x 33 mm /
6.50 x 4.10 x 1.30 in.
Weight Approx. 0.5 kg / 1.10 lb.
Mounting ø5 mm (4 holes)
Environmental
Operating temperature range -30 °C to +60 °C

Diagram and Mounting

TYPICAL RESPONSE CURVES

MOUNTING DETAILS

All dimensions are given in mm [in.] All dimensions are given in mm [in.]

Ordering Designations

Model Product No.
BPF 4/4-FM N(f) 200002648
BPF 4/4-FM BNC(f) 200001792

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