FreeWave Technologies
August 13, 2004
2.4GHz Spread Spectrum Installation Guide
V3.7
LIG0002AC Rev A
8 of 12
Networks using the FreeWave 2.4GHz transceiver that are used exclusively for fixed, point-to-
point operations may employ transmitting antennas with directional gain greater than 6dBi
provided the maximum peak output power of the intentional radiator is reduced by 1 dB for every
3 dB that the directional gain of the antenna exceeds 6dBi.
This excludes the use of Point-to-MultiPoint systems, omni-directional applications, and multiple
co-located intentional radiators transmitting the same information. Either the operator or the
installer of the FreeWave transceiver is responsible for ensuring that the system is used
exclusively for fixed, Point-to-Point operations.
Please contact FreeWave Technologies at 303-444-3862 with any questions regarding this
matter.
NOTE.
Please, be advised that antennas other than listed in this section can potentially be
used with the transceiver provided that:
•
These antennas are of a similar type to the listed above;
•
Antenna gain does not exceed 5 dB for omni-directional and 14 dB for directional
antenna;
•
Overall system EIRP does not exceed limits set forth by Part 15.247 of FCC Rules
and Regulations.
WARNING: Any antenna other than listed in this section needs to be approved by
FreeWave Technologies before it is used to assure that the transceiver in combination
with the new antenna meets FCC requirements.
B. Transceiver Location
Placement of the FreeWave transceiver is likely to have a significant impact on its performance.
In general the rule with FreeWave is that the higher the placement of the antenna the better the
communication link -
height is everything
. In practice, you should also place the transceiver
away from computers, telephones, answering machines, and other similar equipment. To
improve the data link, FreeWave Technologies offers directional and omni-directional antennas
with cable lengths ranging from 3 to 200 feet.
When using an external antenna, placement of that antenna is critical to a solid data link. Other
antennas in close proximity are a potential source of interference; use the Radio Statistics or
Diagnostics software to help identify potential problems. It is also possible that slight adjustments
in antenna placement (as little as 2 feet) will solve noise problems.
