User manual

CONFIDENTIAL Protium Technologies, Inc. 4050-9901
Rev No: 05
5 GHz RF Modem 31-Jan-2007 9 of 84
This document and information contained herein is subject to the restrictions set forth on the title page .
2 Installation and Configuration
2.1 General Installation and Operating Considerations
2.1.1 Antenna
Avoid operating the transmitter without a proper termination on the RF connector. Although the modem is
designed to withstand such operation, undesired interference to other RF systems may occur.
A typical installation will require the use of a high gain antenna. Proper alignment of the antenna is critical to
ensuring an error-free link. During the alignment process, an rsl command from the Craft Interface Terminal
(CIT) will display near real-time receive signal strength and may be used to “peak” the antenna positioning.
This equipment produces RF radiation when connected to a typical high gain directional antenna. Personnel
working in the vicinity of an energized antenna should ensure that they maintain a distance of at least 4.2 feet
(1.28 meters) from the antenna in the direction of maximum gain. See the caution statement at the beginning of
the manual.
The RF Modem is shipped with the transmitter set in the “mute” condition. This is done to prevent inadvertent
transmission on an unauthorized frequency. All operating parameters, including an estimate of the minimum
necessary transmit power, should be programmed into the modem before un-muting the transmitter.
Do not exceed +10 dBm input power at the antenna terminal of the RF Modem or damage to the unit may result.
2.1.2 Site Planning
As with any wireless link, proper system and path planning is essential to ensuring error-free operation. Such
planning should take into consideration path clearances from obstructions, interference from nearby radiators,
multi-path reflections and fading. A system signal strength margin of at least 20 dB above the rated receiver
threshold is standard practice.
When installing multiple modems in the same general location, ensure that they are all transmitting within the
same sub-band to prevent interference and desensitization.
2.1.3 Cooling
Install the RF Modem so that adequate airflow can be maintained through the rear and side or front vents. If
airflow is restricted, the modem internal temperature may rise above the preset thermal shutdown temperature.
2.1.4 Shielding and Grounding
When the DB-25F connector is used for the RF Modem EIA-530/232 data I/O, ensure that a good quality shielded
cable is used and that the cable shield is electrically terminated to the cable connector shells.
A grounding stud is provided on the rear panel. A ground braid should be attached to this lug and connected to a
local earth ground to prevent static charge build-up on the modem, antenna and associated cabling.