The BPBR 70/6… and the BRBP 70/6… are 6-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 70/6… and the BRBP 70/6… 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.
ORDERING DESIGNATIONS
TYPE PRODUCT
NO.
PASS/REJECT
SPACING
(MHZ)
CONFIGURATION
BPBR 70/6-5/7 200001415 5 - 7 BPBR
Low Pass High
Reject
BPBR 70/6-7/9 200001410 7 - 9
BPBR 70/6-
9/13
200001413 9 - 13
BPBR 70/6-
13/16
200001402 13 - 16
BRBP 70/6-5/7 200001539 5 - 7 BRBP
Low Reject High
Pass
BRBP 70/6-7/9 200001541 7 - 9
BRBP 70/6-
9/13
200001544 9 - 13
BRBP 70/6-
13/16
200001530 13 - 16
ORDERING INFORMATION
If pass and reject frequencies are stated when ordering, the filters are
delivered factory-adjusted. Ordering example: BRBP 70/6, 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.
SPECIFICATIONS
ELECTRICAL
MODEL BPBR 70/6 / BRBP 70/6
FILTER TYPE Band-pass / band-reject filters
TUNING RANGE 406 - 470 MHz
MAX. INPUT POWER 50 W
INSERTION LOSS (PASS BAND)
(at 10 MHz spacing)
Single-channel tuned:
Multi-channel tuned, 2 MHz BW:
≤ 1.0 dB
≤ 1.2 dB
REJECT ATTENUATION
Single-channel tuned:
Multi-channel tuned, 2 MHz BW:
Multi-channel tuned, 4.5 MHz BW:
> 85 dB
> 65 dB
> 55 dB
PASS/REJECT SPACING 5 - 16 MHz (see table)
IMPEDANCE Nom. 50 Ω
SWR ≤ 1.5
MECHANICAL
TEMP. RANGE –30° C → +60° C
FREQ. STABILITY Approx. 10ppm/° C
CONNECTORS BNC-female
DIMENSIONS (L x W x H) 225 x 154 x 33 mm
WEIGHT Approx. 990 g
(1 pages)
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