Remote Radio Link User Guide
Page 40
6.1.2 Solar Panels
A solar panel is connected to a RRL station using the Solar/12 Volt Cable Assembly (see Figure 6-7). The
solar panel is user-supplied. The panel should output a minimum of 13V open circuit in order to effectively
re-charge the batteries. As a guideline, the solar panel should be at least 15 Watts. Higher wattage panels are
also suitable. The solar panel must also include a regulator to handle external battery charging cycle.
6.1.3 Antennas
RRL Stations come standard with an omnidirectional antenna. The antenna should always be mounted
on the outside of any enclosure for maximum communication distance, as they communicate via line-of-
sight transmission. 900 MHz radios can communicate over distances up to 20 miles (30 km). To maximize
communication distances between RRL Stations, an optional High Gain Antenna is available (pt# 108987).
Before sourcing any other power accessories or antennas to use with RRL Stations, refer to the radio module
manufacturer’s product manuals for approved devices at: http://www.digi.com.
6.2 Installing RRL Stations in the Field
RRL Stations are designed to fit inside 4.5" (115 mm) diameter wells for discrete placement.
Note:
For more information on installing Leveloggers in the field, see the Levelogger User Guide.
Location and Communication Considerations
When using radio communication, you must take extra care when locating the Remote Stations. RRL radios
communicate with each other via line-of-sight. They must be able to “see” each other in order to have effective
communication. The path between radio antennas should not be through trees or perpendicular to the sides
of flat buildings.
The communication distances given for each radio module, with standard antennas, are guidelines. Each
project is site specific, and will require testing and planning before installing a RRL Network.
A communication range test can be performed prior to installation between the Home Station and the Remote
or Relay Station using the RRL Remote Utility (see Section 5). Tests can be done using different Radio Power
settings (see Section 4.1) to determine the ideal setup for your site. Always start with the lowest Radio Power
setting, as this will conserve battery power. (Longer Report intervals will also conserve battery power).
Field tests will allow you to determine if you need an additional power source due to a higher Radio Power
setting, or the addition of a higher gain antenna to increase communication distances. Adding a Relay Station
should be the last option to increase your communication distance, or if there is an obstacle (such as buildings
or trees) that you have to get your RF signal around.
Summary of Contents for Remote Radio Link
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