Spectra Precision ProFlex 800 Backpack - Manual (Page 11)

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Equipment Description & Basic Functions
Front View
From left to right:
Bluetooth Antenna
A coaxial female connector (reverse SMA type) allowing you
to connect a Bluetooth antenna for wireless communication
with a field terminal or other device.
Cellular Antenna
A coaxial female connector (SMA type) allowing you to
connect a cellular antenna. A cellular antenna is required
when the ProFlex 800 sends or receives RTK or differential
corrections data via its internal cellular modem (GSM).
Take care not to swap the Bluetooth antenna and the cellular
antenna. The picture below shows where the shorter and
longer antennas should be connected.