Spectra Precision ProMark 800 Reference Manual - Manual (Page 87)

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RTK Implementation
Radio Implementation
Radios are usually operated in pairs (one at the base, used as
a transmitter, and the other in the rover, used as a receiver),
but an unlimited number of rovers can receive RTK correction
data from the same base.
An important factor is the radio range. It should be equal to
or greater than the maximum baseline length you need to
survey.
Internal vs. External Radios
Depending on the model of Spectra Precision receiver used,
the pair of radios can be:
• Incorporated into the Spectra Precision receiver. Only the
radio antenna is visible from outside. The modem is
connected to the system via a serial line.
• External to the Spectra Precision receiver and connected
to it via a power/serial data cable.
License-Free vs. Non License-Free Radios
In almost all countries, radio systems are subject to laws
regulating their use. Regulations are more especially about
transmission power, frequency band and channel bandwidth.
They may differ from one country to the other.
In most countries however, radios used under a certain level
of radiated power in dedicated frequency bands do not
require a certification (or license) to be operated freely. For
this reason, Spectra Precision offers two types of radios:
• License-free, low-power radios (short range) (available for
some models of Spectra Precision receivers).
• Licensed medium-power radios (longer range). For this
type of equipment, Spectra Precision will help you get the
certification required for use of the radio in your country.
But remember the right to operate a radio is your
responsibility.
Key Features
The main features of a radio are the following:
Base
Serial Line
Radio Antenna Radio Antenna
Radio Radio
Serial Line
Rover