Sokkia RADIAN IS, Operation Manual

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Radian IS Components Chapter 3
RADIAN™IS 25
The Radian IS provides battery power output through the
COM1 and COM2 ports for powering accessories. The power
output is approximately the same as the input of the active
battery to within ten percent.
If the peripheral devices attached to the Radian IS try to draw
too much power from the battery output, the Radian IS will
limit the current available to prevent damage to the receiver.
Once the excessive load is removed from the Radian IS, normal
operation of the system will resume. If you use the Sokkia
recommended data collector (SDR Level 5) and radio, you will
not overload your system. This possibility only exists if you
attach peripherals that have not been tested with the Radian IS.
3.4 Wireless Communications
The Radian IS enables you to transfer data up to approximately
6 m (20 ft) from the receiver to the data collector via a wireless
communications port.
3.5 GPS antenna
The Radian IS features an integrated antenna with Pinwheel
Technology™. This revolutionary antenna gives the
performance of a choke ring.