Kategori: DUPLEXER

The Telewave TWPC-4504-1
and 4504-2 are 4” diameter,
¼-wavelength, high “Q” bandpass
cavity f i l ters with superior
selectivity. Bandpass cavities reject
all frequencies outside a narrow
pass band. These cavities reduce
transmitter sideband noise, and
also protect receivers against
TWPC-4504 cavities cover 400-
512 MHz. All cavities are tuned
to specified frequencies prior to
shipping, and no further adjustments
should be required. The positive
locking mechanism allows for quick
field retuning if frequency changes
become necessary.
These cavities also feature
calibrated adjustable coupling,
and insertion loss can be easily
set from 0.5 dB to 2 dB or more
to improve selectivity. This allows
cavity response to be optimized
for any operating environment.
At densely populated sites, the
4504-2 cavity filter provides greater
selectivity with minimum insertion
loss. Multiple cavities can also
provide a wider passband when
required. Up to four 4” cavities can
be mounted on one 19” x 5.25”
Excellent frequency stability is
achieved by the use of a specially
machined compensator and
Invar rod. The pass frequency is
temperature stable from -30°C
to +70°C. Telewave Ground Loop
technology places the center
conductor of each coupling loop at
DC ground potential for lightning
protection and noise reduction.
Heavy duty materials are used
throughout each cavity to insure
high performance and long life.
Cavity top plates are machined
from ¼ -inch aluminum, and are
heliarc welded to the cavity body at
the high current point for improved
conductivity and strength. This
allows Telewave cavities to handle
up to 350 watts, depending on
insertion loss.
Similar metals and alodined
aluminum help prevent galvanic
corrosion. Silver plated tuners
and beryllium copper finger stock
provide non-corrosive low loss
contact, and ensure reliable, longterm

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