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SAN JOSE, CA (March 28, 2017) – Telewave, Inc.,
today introduced the
M108-150-XTP-M Series transmitter combiners that deliver very high isolation, low
loss, and high RF power handling capability for use in public safety and land mobile radio applications
operating between 148 to 174 MHz.
The trend toward narrower guard bands between transmit and receive
frequencies requires extremely effective filtering to mitigate interference and increase intermodulation
suppression between transmitters. Telewave's transmitter combiners are designed to meet these challenges
using very-high-Q, low-loss cavity filters and the company's
T-1560M two-stage isolators
that provide extremely high transmitter-to-transmitter isolation and antenna-to-transmitter isolation
of 75 dB.
The M108-150-XTP-M Series combiners are designed to accommodate up to 12 channels with one or two
transmit antennas. They allow up to 12 cavities to be mounted horizontally on three, 4-channel panels
in an optional 19 x 72-in. rack or up to eight cavities mounted vertically in the rack. Vertical mounting
can be important if the combiners must be placed in an area with limited space or when mounting on a
wall is desired.
Models in the series handle between 100 W and 125 W CW per channel with minimum channel separation
of 125 kHz and second-order harmonic suppression of 90 dB. They operate over a temperature range of
-30°C to +60°, have a maximum VSWR of 1.25:1, and use female Type-N input and output connectors. Full-surface
heat sinks ensure stable thermal management in any environment. One model in the series, the M108-150-8TP-M100,
can operate at altitudes up to 15,000 ft. while others are typically usable up to 10,000 ft.
"Land mobile and public safety communications systems face interference from co-located sites and
a densely-packed spectrum," said Telewave Chief Executive Officer Robert Bagheri. "Our new M108-150-XTP-M
Series transmitter combiners are designed to ensure these systems deliver their full performance and
reliability under these difficult conditions."
Rack support is provided for an optional Telewave tuner assembly that can be mounted in any orientation
in the rack as well as RF power monitoring using Telewave's
PM10C2S1C power monitor
that requires only 1.75 in. of rack space for each channel. Remote keying of the transmitter can also
be provided. A receiver subsystem can be created using the M108-150 Series, a Telewave preselector,
and 1 rack-unit receiver panel to serve up to 16 channels.
The M108-150-XTP-M can be factory mounted in an optional rack and can be paired with an optional
power monitor on receive, preselector, and multicoupler. Like all Telewave products for land mobile
and public safety applications, electrical and RF specifications of the M108-150-XTP-M Series combiners
can be customized to meet specific customer requirements. More information is available by contacting
Telewave Application Engineering Department.
Founded in 1973, Telewave is a leading manufacturer of RF products for radio systems used in public
safety and land mobile applications, utilities and transportation, defense systems, and by radio amateurs.
Its products include duplexers, cavity filters, transmitter combiners, power dividers, transmit and
receive filters and isolators, tower-top preamplifiers, preselectors, high-power terminations, and antennas.
The company also manufactures instruments designed to ensure the performance of communication systems,
including wattmeters and RF power monitors. Telewave's products are used by more than 7,500 equipment
and network manufacturers and government agencies throughout the world.
660 Giguere Court
San Jose, CA 95133
Posted April 6, 2017