Exalt Installation and Management Guide
EX-i Series FDD Digital Microwave Radios
20
202675-005
2011-08-30
circulator to accomplish the filtering and connections normally provided by the diplexer. There also
may be special mounting plates to accommodate these devices, but the concept for this arrangement is
similar to the above — the Tx frequency range on one side must match the Rx frequency range on the
opposite side and vice-versa. The filters must be connected to the TX and RX1 ports on the rear panel.
Antenna Connection
The connection leading to the antenna is the ANT port on the diplexer, which is typically an SMA
female connection near the center of the diplexer. The diplexer kit includes a proper high-quality
flexible RF cable to accommodate connection to an N-type female connector, either from the primary
RF cable (if coaxial) or the coaxial jumper that feeds to that waveguide or to a waveguide adapter (sold
separately).
Most transmission system implementations use a waveguide. The waveguide should be mounted so
that the connection is near the ANT connector port. The end of the waveguide run will use the
waveguide-to-coaxial adapter, accommodating the high-quality flexible jumper cable (included). All
losses associated with the jumper(s), adapter(s), and waveguide should be planned in the link budget
used for engineering the link.
Space Diversity
Another diplexer configuration of the radio is for space diversity applications. This is where two
antennas are used, mounted at different heights, to improve performance relative to multipath fading,
which occurs on longer paths, paths over flat terrain, and/or paths over water or in dynamic weather
environments. Space diversity requires two identical diplexers mounted on each radio, and a software
license key that allows enabling the space diversity function in the radio.
A typical space diversity diplexer configuration for a single terminal is shown in Figure 14. Note that
both diplexers are the same type and orientation. One is connected only to the RX2 port for the
diversity receive path.
Figure 14 Typical Space Diversity diplexer configuration
The opposite end of this space diversity link uses the same two diplexers, but rotated — in Figure 14,
ID 102 is the orientation for both diplexers.
Connect the secondary receive antenna to the ANT port of the secondary diplexer in a similar manner
to the primary transmission line connection.
For non-standard pairs, use the ‘Other’ selection for diplexer type. The tuned Tx and Rx
frequencies must be manually entered in to the frequency selection section in the GUI. The
edge frequency range of the filters are labeled on the filters. The center frequency must be
tuned to accommodate the bandwidth setting within the edge frequency range in accordance
to the licensing requirements.
Summary of Contents for EX i GigE Series
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