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 2/3-150… 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
high required stop-band attenuation. Please note that the full power
rating of 150 watts 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 filter is delivered in two basic models: Model BPF 2/3-150 L can be
applied within the band 136 - 154 MHz and model
BPF 2/3-150 H within the band 152 - 175 MHz.
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 INFORMATION
The BPF 2/3-150… 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.
ORDERING DESIGNATIONS
TYPE PRODUCT NO. TUNING RANGE
BPF 2/3-150L 200000842 136 - 154 MHz
BPF 2/3-150H 200000843 152 - 175 MHz
SPECIFICATIONS
ELECTRICAL
MODEL BPF 2/3-150...
FILTER TYPE Band-pass filter
FREQUENCY (tuning range) BPF 2/3-150 L : 136 - 154 MHz
BPF 2/3-150 H : 152 - 175 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
FREQ. STABILITY Approx. 18 ppm/° C
CONNECTORS N-female
LENGTH (INCL. CONN.) Type L: 550 mm
Type H: 535 mm
WIDTH 125 mm
HEIGHT 50 mm
WEIGHT Approx. 2.1 kg
TYPICAL RESPONSE CURVES
(1 pages)
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