Procom BRF 2-3 - Manual

BRF 2/3
Band-Reject (Notch) Filter for the 160 MHz Band
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.
ORDERING DESIGNATIONS
TYPE NO. PRODUCT NO.
BPF 2/3 200001201
SPECIFICATIONS
ELECTRICAL
MODEL BRF 2/3
FILTER TYPE Band-reject (notch) filter
TUNING RANGE 144 - 175 MHz
MAX. INPUT POWER 50 W
INSERTION LOSS
(out-of-reject area 0-430 MHz)
≤ 0.8 dB
REJECT ATTENUATION
(Notch depth)
Single-channel tuned: ≥ 53 dB
Multi-channel tuned, 1.0 MHz BW: ≥ 24 dB
1 dB NOTCH
BAND WIDTH
At 144 MHz: Approx. +2.3/–2.2 MHz
At 175 MHz: Approx. +2.6/–3.6 MHz
IMPEDANCE Nom. 50 Ω
SWR (out-of-reject area) ≤ 1.5
MECHANICAL
TEMP. RANGE –30° C → +60° C
FREQ. STABILITY Approx. 10 ppm/° C
CONNECTORS BNC-female
DIMENSIONS (L x W x H) 165 x 77 x 33 mm
WEIGHT Approx 420 g
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 CURVES
PROCOM A/S reserve the right to amend specifications
without prior notice.
13/02/13