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BPF 900/4

Band Pass FiltersBPF 900/4

Band-Pass Filter for the 900 MHz Band

Description

  • The BPF 900/4 is a 4-¼ λ resonator band-pass filter with internal coupling between the resonators.
  • This filter can be used as a preselector to protect a receiver against interference from transmissions out of the passband, or it can be used to reduce spurious output from a transmitter with up to 50 W output power.
  • The filter can be tuned within the entire 820 - 960 MHz band. Careful design and choice of materials ensurereliable operation over a wide temperature range.
  • The housing is made of extruded aluminium, the chassis of brass, and teflon insulation has been used in the coaxial cables and in the connectors.
  • The filter is coated with black vinyl to prevent corrosion.

Specifications

Electrical
Model BPF 900/4
Filter Type Band-pass filter
Frequency 820 - 960 MHz
Max. Input Power 50 W
Insertion Loss ≤ 1.4 dB (typ.)
Impedance 50 Ω
Reject Attenuation Fc ±100 MHz ≥ 65 dB
Fc ±500 MHz ≥ 100 dB
Fc ±800 MHz ≥ 85 dB
(See curve)
VSWR ≤ 1.5:1
Bandwidth See curve
Mechanical
Connection(s) N(f)
(BNC(f), TNC(f), UHF(f) or SMA(f) on request)
Dimensions 152 x 115 x 33 mm / 5.99 x 4.52 x 1.30 in.
Weight Approx. 0.5 kg / 1.10 lb.
Environmental
Operating temperature range -30 °C to +60 °C

Diagram and Mounting

TYPICAL RESPONSE CURVES

Ordering Designations

Model Product No.
BPF 900/4 N(f) 200000980

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