Campbell Scientific RF500M Radio Modem - Manual (Page 5)

Section 1. General Radiotelemetry
Network
1.1 Introduction
Data retrieval from a remote site can be difficult. One method to accomplish
data collection from isolated sites is through a radio telemetry (RF telemetry)
network. Dataloggers can be accessed by RF telemetry, which requires no
physical connection from the computer to the datalogger. The RF telemetry
link reduces the number of visits to a remote site for data collection.
The RF telemetry network is designed for complete computer control.
LoggerNet software allows data collection from the datalogger, transmitting
datalogger programs, and displaying current readings from the datalogger.
The requirements specific to a RF telemetry network include:
• The distance between radio stations should not be greater than
approximately 25 miles.
• The stations should not have major obstacles between them; therefore,
they should be within line-of-sight of each other.
Telemetry network’s three basic components are:
• Field Station
• Base Station
• Repeater Station
This manual covers the use of the RF500M Modem. Some LoggerNet
software topics are also addressed.
1.2 Field Station
Purpose: The field station is where the measurements are made. The
Campbell Scientific datalogger resides at this station taking the
desired measurements. Any field station can also operate as a
repeater. The only requirement is that the station’s antenna must
be able to communicate in all desired directions. This may require
an omnidirectional antenna.
Equipment Required:
• Radio
• RF Modem
• Antenna and antenna cable
• Datalogger
• Power supply, enclosure, sensors, and mounting needs
1-1