Sierra Wireless AIRLINK HELIX 2140847 User Manual page 17

Note: This device is not
intended for use within
close proximity of the
human body. Antenna
installation should provide
for at least a 20 cm
separation from the
operator.
Rev 3.0D May.10
The Helix will work with most dual band cellular antennas with SMA connectors.
Connect antennas directly to the connectors found on the sides of the Helix.
Note: When using a cable to an antenna placed away from the Helix, minimize the length
of your cable. All gain from a more advantageous antenna placement can be lost with a
long cable to the device. Each external antenna used with an extension cable, should be
located 20cm apart from any other antenna.
Cellular
Antennas
Figure 3-2: Cellular Antennas
Note: Use all four antennas for diversity. Using only one cell antenna or one Wi-Fi antenna
can cause degraded performance.
The optimal placement of the cellular antenna is upright.
Hardware Overview
11