Spectra Precision ProMark 800 Reference Manual - Manual (Page 90)

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RTK Implementation
configuration is well suited to surveying systems used in
base/rover configuration.
Important! ProMark 800 CANNOT operate in CSD mode.
• One modem or cell phone operating in GPRS mode. The
modem is used on the rover side to establish a connection
to the Internet, either in Direct IP or NTRIP mode. The
rover will then receive RTK correction data from the
selected base. This type of data link is well suited to
surveying systems used in rover-only configuration.
Internal vs. External Modems
Depending on the model of Spectra Precision receiver used,
modems can be:
• Incorporated into the Spectra Precision receiver. Only the
antenna is visible from outside.
• External to the Spectra Precision receiver and connected
to it via a power/serial data cable or a Bluetooth
connection.
• External to the Spectra Precision receiver and available as
cell phones.
Features
GSM:
• Based on TDMA technology (TDMA= Time-Division
Multiple Access). The frequency band is divided into
multiple channels which are then stacked together into a
single stream.
• Frequency bands used: 900MHz and 1,800 MHz in
Europe and Asia, 850 MHz and 1,900 MHz in North
America and Latin America.
Base Rover
Antenna Antenna
Modem or
Cell Phone Modem or
Cell Phone
CSD
Antenna
Internet
GPRS
Rover
Modem or
Cell Phone