User's Manual

INSTALLATION AND MAINTENANCE MANUAL
LYNX.sc E1 FAMILY
SPREAD SPECTRUM RADIOS
SEPTEMBER 1999
PAGE 3-10 SECTION 3: INSTALLATION & ADJUSTMENTS
3.3.8 Antenna Planning
Using the path planning tools, proper antenna size can be determined which will yield the desired
path performance. In general, the larger the antenna that is used with the LYNX.sc radio, the better
the link will perform. Larger antennas have narrower beamwidth and higher gain, which will yield
better link performance (higher fade margin, better availability) and improve immunity to interference
(due to the smaller beamwidths). However, larger antennas are more costly to purchase and install
than smaller antennas, in some cases requiring special equipment for installation. All of these
factors should be taken into consideration when selecting antennas.
In areas where transmitted output power restrictions apply, the
use of larger antennas will maintain the benefit of narrow
beamwidths and receive gain. However, output power may need to
be reduced to meet regulations. (See Section 3.13.1)
Prior to installation, the specific antenna location and mounting should be determined. This
advanced planning also yields the transmission line requirements.
Only directional antennas should be used with LYNX.sc spread
spectrum radios. These can be grid or solid parabolic antennas
(minimum 2 foot - .6 meter). Flat panel antennas are also
acceptable if the beam width is kept to a minimum.