BPBR 70/3 / BRBP 70/3

Band-Pass/Band-Reject Filters for the 450 MHz Band

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BPBR 70/3 / BRBP 70/3

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BPBR 70/3 / BRBP 70/3
Electrical
Model BPBR 70/3 / BRBP 70/3
Filter Type Band-pass / band-reject filter
Frequency 406 – 470 MHz
Max. Input Power 50 W
Pass Band Insertion Loss Single-channel tuned: < 1.2 dB
Multi-channel tuned, 2 MHz BW: < 1.2 dB
Impedance 50 Ω
Pass-Reject Spacing 5 – 16 MHz (see table)
Reject Attenuation Single-channel tuned: ≥ 80 dB
Multi-channel tuned, 2 MHz BW: ≥ 55 dB
VSWR < 1.5:1
Environmental
Frequency Stability Approx. 15 ppm / °C
Operating temperature range -30 °C to +60 °C
Mechanical
Connection(s) N(f), (other on requrest)
Historic Brand Amphenol Procom
Dimensions 225 x 77 x 33 mm / 8.83 x 3.03 x 1.30 in. (incl. connectors)
Weight Approx. 0.51 kg / 1.12 lb.
  • The BPBR 70/3… and the BRBP 70/3… are 3-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 enough 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 BPBR 70/3… and the BRBP 70/3… are both adjustable within the complete 406 – 470 MHz band. Both types can be delivered in four different versions, each dedicated to work with a certain spacing between the pass frequency and the reject frequency. See “Ordering information” below.
  • The filters use full-length ¼ cavities in a compact, extruded aluminium housing. The chassis is made of passivated steel, and teflon insulation has been applied in the coaxial cables and in the connectors. The filters are black vinyl coated to prevent corrosion.
  • Careful design and choice of materials ensure reliable operation over a wide temperature range.

TYPICAL RESPONSE CURVE: BRBP 70/3

TYPICAL RESPONSE CURVE: BPBR 70/3

MOUNTING DETAILS

All dimensions are given in mm [in.]

All dimensions are given in mm [in.]

Model Product No. Additional Information Add To Quote

BPBR 70/3-5/7 N

 200001392 Pass/Reject Spacing: 5 – 7 MHz

BPBR 70/3-7/9 N

 200001740 Pass/Reject Spacing: 7 – 9 MHz

BPBR 70/3-9/13 N

 200001387 Pass/Reject Spacing: 9 – 13 MHz

BPBR 70/3-13/16 N

 200001380 Pass/Reject Spacing: 13 – 16 MHz

BRBP 70/3-5/7 N

 200001507 Pass/Reject Spacing: 5 – 7 MHz

BRBP 70/3-7/9 N

 200001739 Pass/Reject Spacing: 7 – 9 MHz

BRBP 70/3-9/13 N

 200001516 Pass/Reject Spacing: 9 – 13 MHz

BRBP 70/3-13/16 N

 200001506 Pass/Reject Spacing: 13 – 16 MHz

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Ordering information

If pass and reject frequencies are stated when ordering, the filters are delivered factory-adjusted. Ordering example: BRBP 70/3, LOW: 443.7 MHz, HIGH: 450.3 MHz. In this case, further information is not required.

When ordering untuned filters please use the model selection table above to select the appropriate ordering designation for the desired filter type.

Special versions of the filters with spacings down to 3 MHz may be quoted on request.