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BPF 70/4

Band Pass FiltersBPF 70/4

Band-Pass Filter for the 450 MHz Band

Description

  • The BPF 70/4 is a 4 resonator ¼ λ band-pass filter with inductive coupling between the resonators.
  • This filter can be used as a preselector to protect a receiver from interference from transmitters outside the band-pass limits.
  • When installed at the output of a transmitter, the BPF 70/4 reduces spurious signals.
  • The BPF 70/4 is adjustable over the range 380 - 470 MHz.
  • Careful choice of materials ensures reliable functioning over a wide temperature range.
  • Extruded aluminium sections, steel racks and coax cables and connectors with teflon insulation ensure good mechanical strength.
  • BPF 70/4 is coated with black vinyl to prevent corrosion.
  • The filter is delivered in standard version with 4 MHz bandwidth, other bandwidths can be requested when ordering (up to 10 MHz)

Specifications

Electrical
Model BPF 70/4
Filter Type Band-pass filter
Frequency 380 - 470 MHz
Max. Input Power 50 W
Insertion Loss < 1.5 dB
Impedance 50 Ω
Reject Attenuation See curve
VSWR < 1.5:1
Bandwidth 4 MHz - 10 MHz
Mechanical
Connection(s) N(f)
(BNC(f), TNC(f), UHF(f) or SMA(f) on request)
Dimensions 208 (without connectors) x 104 x 33 mm /
8.19 x 4.09 x 1.3 in.
Weight Approx. 0.69 kg / 1.52 lb.
Environmental
Operating temperature range -30 °C to +60 °C

Ordering Designations

Model Product No.
BPF 70/4-4-N(f) 200000925
BPF 70/4-6-N(f) 200002977
BPF 70/4-8-N(f) 200002978
BPF 70/4-10-N(f) 200002979

Typical Response curves

4 MHz

BPF 70!4 4 N curve

 6 MHz

BPF 70!4 6 N curve

 8 MHz

BPF 70!4 8 N curve

10 MHz

BPF 70!4 10 N curve

Mounting details

BPF 70 4 holeplacing

All dimensions are given in mm [in.]

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