User's Manual

Axell D-SBR 3709S Repeater
PRODUCT DESCRIPTION AND USER’S MANUAL
VI Doc PN 00038UMCD Rev. 1.6 © Axell Wireless Ltd
NOTE: In this example there is no need to add an external bandpass filter to attenuate the out band
noise.
Conclusion:
Good engineering practice requires that in general when the out of band noise
measured at the service antenna input is more than -70 dbm per 10 kHz measurement
bandwidth, an external band pass filter should be added to attenuate the out of band
noise level.
General Safety Warnings Concerning Use of This System
Always observe standard safety precautions during installation, operation and
maintenance of this product.
Caution labels!
Throughout this manual, there are "Caution" warnings. "Caution"
calls attention to a procedure or practice, which, if ignored, may
result in injury or damage to the system, system component or
even the user. Do not perform any procedure preceded by a
"Caution" until the described conditions are fully understood and
met.
Danger: Electrical Shock
This equipment must be installed only indoors. To prevent
electrical shock when installing or modifying the system power
wiring, disconnect the wiring at the power source before working
with un insulated wires or terminals.
Caution: RF Exposure
RF radiation, arising from transmitter outputs connected to AWL’s
equipment, must be considered a safety hazard.
This condition might only occur in the event of cable
disconnection, or because a ‘spare’ output has been left un-
terminated. Either of these conditions would impair the system’s
efficiency. No investigation should be carried out until all RF
power sources have been removed. This would always be a wise
precaution, despite the severe mismatch between the impedance
of an N type connector at 50 ohm, and that of free space at 377
ohm, which would severely compromise the efficient radiation of
RF power. Radio frequency burns could also be a hazard, if any
RF power carrying components were to be carelessly touched!
Antenna positions should be chosen to comply with requirements
(both local & statutory) regarding exposure of personnel to RF
radiation. When connected to an antenna, the unit is capable of
producing RF field strengths, which may exceed guideline safe
values especially if used with antennas having appreciable gain.
In this regard the use of directional antennas with backscreens
and a strict site rule that personnel must remain behind the screen
while the RF power is on, is strongly recommended.
Where the equipment is used near power lines or in association
with temporary masts not having lightning protection, the use of a
safety earth connected to the case-earthing bolt is strongly
advised.