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BPBR 4/4 / BRBP 4/4

Pass/Reject FiltersBPBR 4/4 / BRBP 4/4

Band-Pass/Band-Reject Filters for the 80 MHz Band

Description

  • The BPBR 4/4 and the BRBP 4/4 are 4-cavity pass-reject filters, which pass one frequency or frequency band and reject another in immediate vicinity of the pass frequency.
  • The filters are delivered in two basic models: The BPBR-types have the reject range on the high side of the pass frequency and the BRBP-types have the reject range situated on the low side of the pass frequency.
  • These filter types can be used to protect a receiver against interference from a nearby transmitter. The filters are tuned to reject the interfering signal. Pass-reject-type filters are applied when the spacing between the utility signal and the interfering signal is so small, that the slope steepness of normal band-pass filters or notch filters are not sufficient to provide adequate rejection.
  • The filters are primarily intended to pass and reject two single frequencies, but the filters can also be tuned to pass and reject several single frequencies or to having a certain pass and reject port bandwidth. In these cases factory-tuning is recommended.
  • The standard BPBR-filters can be tuned within the complete 4 m-band with 2 to 16 MHz spacing between the operating frequencies.
  • Insertion loss is below 1.3 dB at spacings between 3 and 16 MHz. At the narrowest spacing of 2 MHz, insertion loss is kept under 2.0 dB.
  • The filters have very small dimensions ove to the use of high-Q helical resonators with discrete-component interconnections.
  • The housing is made of extruded aluminium, the chassis of passivated steel, and the connectors are provided with teflon insulation.
  • The filters are black vinyl coated to prevent corrosion.
  • Careful design and choice of materials ensure reliable operation over a wide temperature range.

Specifications

Electrical
Model BPBR 4/4 / BRBP 4/4
Filter Type Band-pass / band-reject filter
Frequency 66 - 88 MHz (Option : 88 - 108 MHz)
Max. Input Power @ 3 - 16 MHz spacing : 50 W
@ ≤ 3 MHz spacing : 35 W
Special spec. info Single-channel tuned: Multi-channel tuned
(at max 2 MHz BW):
Insertion Loss at 2 MHz spacing : ≤ 2.0 dB
at 3 MHz spacing : ≤ 1.3 dB
at 4 MHz spacing : ≤ 1.0 dB
at 16 MHz spacing : ≤ 0.6 dB		 closest spacing 2 MHz : ≤ 1.5 dB
closest spacing 3 MHz : ≤ 1.0 dB
closest spacing 4 MHz : ≤ 0.8 dB
closest spacing 16 MHz : ≤ 0.6 dB
Impedance 50 Ω
Pass-Reject Spacing 2 - 16 MHz
Reject Attenuation ≥ 90 dB ≥ 60 dB
VSWR < 1.5:1
Mechanical
Connection(s) N(f), (BNC(f) on request)
Dimensions 152 x 104 x 33 mm / 5.98 x 4.09 x 1.29 in.
Weight Approx. 0.43 kg / 0.95 lb.
Mounting 5 mm / 0.20 in. dia. (4 pcs.)
Environmental
Operating temperature range -30 °C to +60 °C

Ordering Designations

Model Product No. Description Frequency
BPBR 4/4 N(f) 200001368 Pass Low Reject High
BRBP 4/4 N(f) 200001496 Reject Low Pass High

Typical Response Curves

BPBR 4!4 BRBP 4!4 Curve1 GB

BPBR 4!4 BRBP 4!4 Curve2 GB

Mounting Details

BPBR 4!4 BRBP 4!4 holeplacing

All dimensions are given in mm [in.]

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