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RTK Base Station Setup
DK01672,00000E7 -19-12JUL11-3/3
The ability to use a single base station is a substantial
reduction in cost and maintenance. The drawback to this
method is that only one radio can be congured at a time.
A single RS232 port is used by the StarFire™ receiver
to communicate with an RTK radio. Two radios can
simultaneously receive RTK corrections from the receiver.
Unfortunately, the receiver can not process simultaneous
messages sent from the radios. The two radios send
different messages and interfere. To ensure that this
interference does not occur, the dual radio harness has
the radio send wire in only one branch.
To prevent network connection errors, a specic
procedure must be followed when conguring a base
station supporting two radios:
1. Connect the Dual Radio Harness to the StarFire™
Receiver.
2. Power the base station StarFire™ Receiver with only
standard 900MHz RTK radio connected to 4-wire
Deutsch connector. The receiver must have clear
view of the sky.
3. Once the receiver determines its position, congure
standard RTK radio Network ID and Radio Channel.
4. Power down the base station StarFire™ Receiver.
5. Disconnect standard 900MHz RTK radio and then
connect RTK Radio 450 to the 4-wire Deutsch
connector.
6. Once the receiver determines its position and
recognizes the radio, congure RTK Radio 450 to
comply with the site license.
7. Power down the receiver.
8. With RTK Radio 450 still attached to the 4-Wire
Deutsch connector, connect the standard 900MHz
RTK radio to the 3-wire Deutsch connector.
9. Power the base station.
IMPORTANT: Do not attempt to change the radio
parameters while both radios are attached.
This can corrupt the conguration of 900 MHz
radio and may cause problems with rovers
liking to it. If this does occur, recongure the
radios with the process given above.
During normal operation, ensure that RTK Radio
450 is connected to the 4-wire connector and
that standard 900MHz RTK radio is connected
PUPC000007 —UN—03DEC09
4-Wire RTK Connector
PC13762 —UN—17MAY11
3-Wire RTK connector
to the 3-wire connector. If the receiver detects
a standard 900MHz RTK radio, RTK Radio
450 link may be compromised. At its lowest
data speed, the RTK Radio 450 does not have
the capacity to transmit corrections at the
Standard 900MHz RTK radio.
The mandatory narrow bandwidth of the licensed band
radio results in a slower over-the-air baud rate because
Vehicles using 900Mhz will see fewer messages received
when using a dual radio base station as their correction
source. In a network with repeaters enabled the RTK
message rate will be further reduced.
25-8
092711
PN=19