User guide

BPF 4/4
Band-Pass Filter for the 80 MHz Band
DESCRIPTION
The BPF 4/4 is a 4-helical resonator band-pass filter with aperture-
coupling between the resonators.
This filter can be used as a preselector to protect a receiver against
interference from transmissions out of the pass-band, or it can be used
to reduce spurious output from a transmitter with up to 50 W of output
power.
The BPF 4/4-C-version fits directly into our receiver multicouplers PRO-
AR4G-N… etc.
The filter can be tuned within the entire 66 - 88 MHz band. It has very
small dimensions owing to the use of helical resonators. Careful design
and choice of materials ensure reliable operation over a wide
temperature range.
The housing is made of extruded aluminium, the chassis of steel, and
teflon insulation has been used in the coaxial cables and in the
connectors.
The filter is black vinyl coated to prevent corrosion.
ORDERING DESIGNATIONS
TYPE NO. PRODUCT NO.
BPF 4/4 200000883
SPECIFICATIONS
ELECTRICAL
MODEL BPF 4/4
FILTER TYPE Band-pass filter
TUNING RANGE 66 - 88 MHz
MAX. INPUT POWER 50 W
INSERTION LOSS ≤ 1.2 dB (typ.)
ATTENUATION AROUND PASS-BAND See curves
OUT OF BAND ATTENUATION See curves
IMPEDANCE Nom. 50 Ω
SWR ≤ 1.5
MECHANICAL
TEMP. RANGE –30° C → +60° C
CONNECTORS BNC-female (others on request)
DIMENSIONS (L x W x H) 165 x 104 x 33 mm
WEIGHT Approx 500 g
TYPICAL RESPONSE CURVES
PROCOM A/S reserve the right to amend specifications
without prior notice.
21/01/11