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BPF 70/4-HX

Band Pass FiltersBPF 70/4-HX

Band-Pass Filter for the 450 MHz Band

Description

  • The BPF 70/4-HX 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 from interference from transmitters outside the band-pass limits.
  • When installed in the output of a transmitter, the BPF 70/4-HX reduces spurious signals.
  • The BPF 70/4-HX is adjustable in a low and high version over the frequency range 380 - 440 MHz and 430 - 470 MHz.
  • Very compact due to use of helical resonators.
  • The careful choice of materials, ensures the filter will function reliably over a wide temperature range.
  • Extruded aluminium sections, steel racks and coax cables and connectors with teflon insulation ensure good mechanical strength.
  • The filter is black vinyl coated to prevent corrosion.

Specifications

Electrical
Model BPF 70/4-HX
Filter Type Band-pass filter
Frequency BPF 70/4-HX/L : 380 - 440 MHz
BPF 70/4-HX/H : 430 - 470 MHz
Max. Input Power 35 W
Insertion Loss ≤ 1.5 dB typ. 1.2 dB
Impedance 50 Ω
Reject Attenuation See curves
VSWR ≤ 1.5:1
Bandwidth Min. 3 MHz
Mechanical
Connection(s) N(f)
(BNC(f), TNC(f), UHF(f) or SMA(f) on request)
Dimensions 110.6 x 104 x 33 mm / 4.35 x 4.09 x 1.30 in.
Weight Approx. 0.43 kg / 0.95 lb.
Environmental
Operating temperature range -30 °C to +60 °C

Diagram and Mounting

TYPICAL RESPONSE CURVES

MOUNTING DETAILS

Ordering Designations

Model Product No.
BPF 70/4-HX/L N(f) 200000975
BPF 70/4-HX/H N(f) 200001130

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