Procom BPF 70-3-150 - Manual

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