INSTALLATION AND MAINTENANCE MANUAL
E1 FAMILY
LICENSED & SPREAD SPECTRUM RADIOS
JUNE 2001
SECTION 2: PRODUCT DESCRIPTION PAGE 3-49
3.10 Antenna Installation & Alignment
The antenna installation consists of mounting the antenna on the tower, building roof, or other
location that provides line-of-sight path clearance to the far-end location. In general, antennas
smaller than 2 feet diameter are not recommended for urban areas due to their wider beam widths,
which results in higher interference susceptibility. For 2.4 GHz Lynx radios, a minimum of 4 foot
(1.2m) diameter antennas, or larger, are recommended.
Antennas should be ordered with a suitable mounting kit specific to the site requirements. For
example, specifying round or angle tower leg adapters, or a roof tripod as necessary.
The antenna must be very rigidly mounted, with adequate room for azimuth and elevation
adjustment.
The antenna polarization must be the same at both ends of the link, either vertical or horizontal.
In general, antenna mountings require a support pipe to which upper and lower support brackets are
attached with “U” bolts. The antenna and optional elevation and azimuth adjustment rods are then
mounted onto the support brackets. The whole structure must be adequately grounded for lightning
protection. The antenna system must always be installed according to the manufacturer’s
instructions.
Unless special test equipment is available, two operating Lynx terminals are required to align the
antennas. Alternatively, a CW generator may be used to transmit a signal toward the end under
alignment.
The antenna is coarse aligned using visual sighting and then fine aligned using the receive signal
level (RSL) voltage of the Lynx.
The RSL voltage reading can still be used to peak antennas
even if the radios have not synchronized, however far-end RSL
cannot be measured from the near-end terminal until radios are
synchronized.
To coarse align the antenna, first set it for flat elevation (no up or down tilt) using a spirit level. Then
point it at a heading marker obtained using a compass back-bearing from an adjacent location,
(ideally, 100 feet or more away from the antenna).
Antennas used for this device must be fix-
mounted on permanent outdoor
structures to provide 5 meters or more separation from all persons during
device operation to comp
ly with FCC RF exposure requirements. Please
contact Western Multiplex factory for applicable gain and type restrictions to
ensure compliance.
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