User Manual

MBF, Multi Band Repeater
PRODUCT DESCRIPTION AND USER'S MANUAL
© Axell Wireless Ltd A 200 93 00, rev E 18 (105)
Using leaky feeders is normally the most effective way to cover a tunnel, since the signal is evenly distributed
along the tunnel. Achieving good coverage in a train tunnel, for instance, using antennas can be difficult as
the trains tend to block signal propagation.
1.3.4.2 Open Area Coverage
A fiber optic fed repeater can be used in combination with a HUB or an OptoBox to move the repeater away
from the base station. This can in some cases be used to avoid antenna isolation problems.
BTS
HUB/OptoBox
Fiber Fed
Repeater
Optical Fiber
Omnidirectional
Antenna
Directional Coupler
In this example a HUB/OptoBox is placed at the BTS site. The RF signal is tapped from the antenna by a
directional coupler, translated into an optical signal and sent to the repeater over a fiber optic link. At the
repeater site a fiber fed repeater receives the signal, translates it back to RF and sends it to the antenna. This
antenna can be for instance omni-directional because the distance to the BTS is no longer a problem.