CRVW3 3-Channel Vibrating-Wire Datalogger
72
not operate as well in the summer when leaves are on the trees. When choosing
a site for a station, consider any factors in the environment that may change
seasonally.
Reflective Interference and Fresnel Zones:
Because transmissions from an
antenna radiate outward in multiple directions, radio wave pathways sometimes
get reflected in a way that causes destructive interference at the receiving
location. Water surfaces, some kinds of flat landscape/ground, or other flat
features can reflect radio waves and cause this type of signal degradation. A
Fresnel zone helps to identify the height at which an antenna should be placed
to maximize signal strength between two stations. In the field, you can
experiment by raising (or sometimes lowering) the antenna to maximize the
radio link strength. For more information, see
en.wikipedia.org/wiki/Fresnel_zone
10.2.8.2 Plan Validation with Others
It can be helpful to share your radio network plan with others. This process
may uncover items that require additional planning. There may be others in
your organization that have experience deploying and operating radio
networks. Contact your local Campbell Scientific support representative to
discuss your plan and any questions or concerns you may have with it. When
using the
Network Planner
software, a saved *.NWP file can be provided to
Campbell Scientific or others for review.
Ensure that you have the right antenna types selected for each station. Mounting
hardware may be needed for repeater stations and the base station. Review the
.
10.2.8.3 Hardware Procurement
Using your network plan as a resource, contact your local Campbell Scientific
representative to place an order for the required hardware. The ordering
process brings a number of items into the discussion that are usually needed for
typical deployments.
10.3 Deployment Strategy
Once the hardware for your CRVW3 radio network arrives, it needs to be
configured, validated, and deployed to the field.
10.3.1 Radio Network Lab Validation
You should connect to each CRVW3 individually in the office or lab and
Lab Connection and Configuration
(p. 15)
).
However, you should also set up at least part of your radio network and
validate it in the lab, if possible. Install and configure
LoggerNet
on a
temporary or portable computer. Set up a base station, and confirm that it can
communicate with a few CRVW3 stations. Set up a repeater station and ensure
it works. Refer to Sections 10.4 through 10.7 for details about how this is done.
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