Specifications

27
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T-PASS
®
EXPANDABLE
TRANSMITTER COMBINERS
T-PASS
®
EXPANDABLE
TRANSMITTER COMBINERS
746-869 MHz
TX RX Systems T-Pass
®
transmitter combiners utilize
innovative, three-port bandpass cavities of patented
design (U.S. Patents No. 4,249,147 and 4,493,422)
and dual ferrite isolators to provide all the benefits of
ordinary cavity/ferrite combiners:
• Significantly lower channel insertion loss than
hybrid/ferrite combiners;
• High isolation between transmitters;
• High antenna-to-transmitter isolation;
• High intermodulation suppression
• Excellent transmitter noise suppression.
Unlike ordinary cavity/ferrite combiners, T-Pass
®
transmitter combiners are inherently expandable,
broadband and easily adaptable to the most difficult
duplex system design requirements.
Superior Expandability and Bandwidth
Ordinary cavity/ferrite combiners rely upon quarter-
wave cable transformers, resonant stubs and star
junctions for combining groups of two, four or five
channels. Mechanical problems quickly develop in the
process of trying to locate several groups of cavities in
close proximity to each other. Additionally, because of
the frequency-sensitive, narrowband nature of the
cable transformers, operating bandwidth is usually
restricted to about 6% of system center frequency.
T-Pass
®
combiner systems can be expanded one
channel at a time with factory-tuned, easy-to-install
expansion channel assemblies. Expansion is usually
accomplished without modifications to the existing
system, and it amounts to nothing more than placing a
new channel assembly, or several, on top of the exist-
ing system. New channel frequencies can be above,
below, or between existing channel frequencies.
T-Pass
®
channel interconnect cables are individually
optimized to their own channel frequency. No compro-
mises are necessary to accommodate other channel
frequencies. Each channel can therefore be anywhere
in a very broad frequency range. T-Pass
®
coupling
loops and interconnect cables are elegantly designed
to operate together as a broadband 50-ohm transmis-
sion line. Individual channel frequencies are therefore
not restricted to a narrow operating bandwidth, as in
the case of ordinary cavity or cavity/ferrite combiners.
T-Pass
®
transmitter combiners are inherently capable
of operating over bandwidths that span the entire 746-
869 MHz frequency range.
Expansion Channel
746-869 MHz T-Pass
®
transmitter combiner channel
assemblies consist of the following items:
• A 6.625” 3-quarterwave T-Pass
®
cavity filter;
• A dual ferrite isolator, with RF loads and coaxial
cable for connection to cavity.
• An RF sampler to measure RF power reflected
into the isolator output load
• Isolator and channel mounting hardware
Expansion assemblies (channel 2 and higher) are sup-
plied with a thruline of the correct length for the new
and existing channel frequencies. Starter channels
(channel 1, bottom) are supplied with a short circuit on
the T-Pass loop.
NAVAIR
TECHNOLOGIES
All T-Pass Expandable Transmitter Combiners comes with a 5 year OEM warranty.
NEW