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Band Reject FiltersBRF 2/3

Band-Reject (Notch) Filters for the 160 MHz

Description

The BRF 2/3 is a 3-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 0 - 430 MHz. 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 2/3 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 2/3

Filter Type

Band-reject (notch) filter

Frequency

144 - 175 MHz

Max. Input Power

50 W

Insertion Loss

0 - 200 MHz IL ≤ 0.8 dB
200 - 430 MHz IL ≤ 1.3 dB

1 dB Notch Bandwidth

At 144 MHz : Approx. +2.3 / -2.2 MHz
At 175 MHz : Approx. +2.6 / -3.6 MHz

Impedance

50 Ω

Reject Attenuation

Single-channel tuned : ≥ 53 dB
Multi-channel tuned, 1.0 MHz BW : ≥ 24 dB

VSWR	≤ 1.5:1 : 0 - 200 MHz ≤ 2.75:1 : 200 - 430 MHz

Mechanical

Connection(s)

N(f)
(BNC(f), TNC(f) on request)

Dimensions

165 x 77 x 33 mm / 6.50 x 3.03 x 1.30 in.

Weight

Approx. 0.42 kg / 0.93 lb.

Mounting

5 mm dia. / 0.20 in. dia. (4 holes)

Environmental

Operating temperature range

-30 °C to +60 °C

Frequency Stability

Approx. 10 ppm / °C

Ordering Designations

Model	Product No.
BRF 2/3 N(f)	200001208

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.