Procom BPF 70-3-150 User Manual download pdf

BPF 70/3-150

Highly Selective Band-Pass Filter for the 450 MHz Band

with High Power-Handling Capability (150 W)

DESCRIPTION

This band-pass filter is mainly applied to prevent interference between

transceivers with narrow frequency spacing which are operating on

antennas installed very close to each other.

One of the transmitters may cause intermodulation in the output

amplifier of the other transmitter, or the presence of one transmitter

might “block” the contrary receiver or desense it because of excess

sideband noise.

The BPF 70/3-150 consists of 3 full-size quarter wavelength cavities with

adjustable capacitive coupling between the resonators. This filter is

applied when other available band-pass filters or pass-reject filters do

not provide adequate power handling capability, or lack in attenuation at

narrow separations.

The filter has a very steep rolloff between the pass-range and the stop-

band. This rolloff can be made even steeper by sacrificing on insertion

loss. This “trade-off” may be necessary by very small separations or by

highly required stop-band attenuation. Please note that the full power

rating of 150 W can only be kept when keeping insertion loss below 1

dB. If insertion loss is raised to 2 dB, maximum allowable input power is

75 W.

Another feature of this filter is its ability to be tuned with a certain pass-

range bandwidth.

The housing is made of extruded aluminium, the chassis of passivated

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 PRODUCT NO.

BPF 70/3-150 200000926

SPECIFICATIONS

ELECTRICAL

MODEL BPF 70/3-150

FILTER TYPE Band-pass filter

TUNING RANGE 380 - 470 MHz

MAX. INPUT POWER @ max. 1 dB insertion loss: 150 W

@ max. 2 dB insertion loss: 75 W

ATTENUATION AROUND PASS-BAND See curves

OUT OF BAND REJECTION See curves

IMPEDANCE Nom. 50 Ω

SWR ≤ 1.4

MECHANICAL

TEMP. RANGE –30° C → +60° C

CONNECTORS N-female

DIMENSIONS (L x W x H) 257 (incl. conn.) x 125 x 50 mm

WEIGHT Approx. 1.17 kg

TYPICAL RESPONSE CURVES

ORDERING INFORMATION

The BPF 70/3-150 is delivered factory tuned. Depending on the nature of

the problem the band-pass filter has to solve, please specify the relevant of

the following data when ordering: Centre frequency, operating frequency of

disturbed or disturbing transmitter, required attenuation at stop-frequency,

tolerable insertion loss and, optionally: pass range bandwidth.

PROCOM A/S reserve the right to amend specifications

without prior notice.

10/03/11

BPF 70/3-150 1

Summary of Contents

Page 1 - BPF 70/3-150

BPF 70/3-150Highly Selective Band-Pass Filter for the 450 MHz Bandwith High Power-Handling Capability (150 W)DESCRIPTIONThis band-pass filter is mainl

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