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BPBR 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.
Specification
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 dBclosest 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
Environmental
Operating temperature range -30 °C to +60 °C
Mechanical
Connection(s) N(f), (BNC(f) on request)
Historic Brand Amphenol Procom
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.)
Ordering Codes
Model Product No. FrequencyAdditional Information

BPBR 4/4 N(f)

 200001368 Reject High Pass Low

BRBP 4/4 N(f)

 200001496 Pass High Reject Low
Additional Information
Typical Response Curves

Mounting Details

BPBR 4!4 BRBP 4!4 holeplacing

All dimensions are given in mm [in.]

PROCOM A/S reserves the right to amend specifications without prior notice
PROCOM A/S • Smedetoften 12 DK 3600 Frederikssund • Denmark
Generated : 2026-06-24 Version 1