Axiometric LLC BER2 User Manual
Stealth Repeater
®
- QSG
Antenna
The Repeater requires a 902-928MHz antenna connected via coaxial cable to the N-type
connector (12) on the top of the chassis. The Repeater transceiver communicates with
the wireless mesh network via this antenna; a gain antenna is highly recommended; up to
8dBi antennas may be used for maximum coverage.
connector (12) on the top of the chassis. The Repeater transceiver communicates with
the wireless mesh network via this antenna; a gain antenna is highly recommended; up to
8dBi antennas may be used for maximum coverage.
The Repeater has built in antenna monitoring circuitry that measures the efficiency of the
antenna and the coaxial cable; if the antenna is missing or if the connection to the
antenna is open or short-circuited, or if the antenna is positioned in such a way as to
make communications ineffective, the Repeater will light the red fault indicator in the
Antenna Status LED bar.
antenna and the coaxial cable; if the antenna is missing or if the connection to the
antenna is open or short-circuited, or if the antenna is positioned in such a way as to
make communications ineffective, the Repeater will light the red fault indicator in the
Antenna Status LED bar.
Transmissions are monitored for VSWR and power to ensure an efficient antenna system
is in place; the VSWR and power measurements can be viewed in the System Manager;
this eliminates the need for expensive and complex antenna analyzers during installation
and allows continuous monitoring of the antenna during operation. If the antenna or the
coaxial feed-line are damaged or removed, the Repeater will detect the condition and
issue an alarm.
is in place; the VSWR and power measurements can be viewed in the System Manager;
this eliminates the need for expensive and complex antenna analyzers during installation
and allows continuous monitoring of the antenna during operation. If the antenna or the
coaxial feed-line are damaged or removed, the Repeater will detect the condition and
issue an alarm.
The coaxial cable connecting the antenna to the Repeater should have low loss at 902-
928MHz. Only high quality cable such as LMR400 should be used. Many popular
calculators are available on-line to determine the loss a given type of cable will cause at
915MHz for example:
928MHz. Only high quality cable such as LMR400 should be used. Many popular
calculators are available on-line to determine the loss a given type of cable will cause at
915MHz for example:
http://www.timesmicrowave.com/cgi-bin/calculate.pl
Although N-connectors are waterproof
and designed for rugged outdoor
operation, it is often desirable to further
waterproof the connections; heat-shrink
tubing with internal glue is often used to
seal the connection between the cable
and the connector.
and designed for rugged outdoor
operation, it is often desirable to further
waterproof the connections; heat-shrink
tubing with internal glue is often used to
seal the connection between the cable
and the connector.
The antenna should be mounted as high
as possible. The antenna should not be
placed close to other objects (including
the pole itself); other objects, especially
metal objects, in close proximity to the
antenna will result in particularly poor
performance.
as possible. The antenna should not be
placed close to other objects (including
the pole itself); other objects, especially
metal objects, in close proximity to the
antenna will result in particularly poor
performance.
If the antenna cannot be mounted at the
top of a pole, it should be mounted on
an arm that places the antenna as far
from the pole as possible. Refer to the
diagrams in Illustration 1 for examples of good and bad antenna mounting practices.
top of a pole, it should be mounted on
an arm that places the antenna as far
from the pole as possible. Refer to the
diagrams in Illustration 1 for examples of good and bad antenna mounting practices.
Copyright 2013, Axiometric, LLC
Page 10
Confidential
Warning:
The Stealth Repeater can not operate WITHOUT an antenna. Damage WILL
happen without one.
The Stealth Repeater can not operate WITHOUT an antenna. Damage WILL
happen without one.
Illustration 1: Good and Bad Antenna
Mounting Positions
Mounting Positions