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BRF 2/4

Band Reject FiltersBRF 2/4

Band-Reject (Notch) Filters for the 160 MHz

Description

  • The BRF 2/4 is a 4-cavity notchfilter using helical resonators.
  • This filter rejects a narrow band of frequencies in the 2 m band and passes all others in the range. The filter can be applied both in connection with transmitters and receivers to attenuate interfering signals causing cross modulation effects. The filter can be employed as a single component or it can function as an integrated part of a complete multicoupling system.
  • The BRF 2/4 can be tuned within the complete 144 - 175 MHz band. Careful design and choice of materials ensure reliable operation over a wide temperature range.
  • The housing is made of extruded aluminium, the chassis of passivated steel, and teflon insulation has been applied in the coaxial cables and in the connectors.
  • The filter is black-vinyl coated to prevent corrosion.

Specifications

Electrical
Model BRF 2/4
Filter Type Band-reject (notch) filter
Frequency 144 - 175 MHz
Max. Input Power 50 W
Insertion Loss ≤ 1 dB outside rejection band
Impedance 50 Ω
Reject Attenuation Single-channel tuned : ≥ 75 dB
Mechanical
Connection(s) N(f)
(BNC(f), TNC(f) on request)
Dimensions 165 x 104 x 33 mm / 6.50 x 4.10 x 1.30 in.
Weight Approx. 0.58 kg / 1.28 lb.
Mounting 5 mm dia. / 0.20 in. dia. (6 holes)
Environmental
Operating temperature range -30 °C to +60 °C

Ordering Designations

Model Product No.
BRF 2/4 N(f) 200001216

Please Note

The notch filter resonators can also be separately tuned to three different frequencies in a "multiple notch" configuration, but the attenuation on each frequency is then only approximately one third of the normal attenuation when all notches work together.

Typical response curve

BRF 2 4 VSWR plot

Mounting Details

BRF 2 4 Mounting details

All dimensions are given in mm [in.]

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