User Guide

Chapter 2: Hardware setup 3
• Tx1 is the main transmit antenna port.
• Tx2 is the diversity transmit antenna port.
• GPS is used for connecting an external GPS clock. See trx sdr.pdf document for more
details.
2.4.1 RF connection for one cell 2x2 MIMO in FDD mode
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Note: For SISO test, connection between DUT antenna2 and Callbox Tx2 is not required
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2.4.2 RF connection for one cell 2x2 MIMO in TDD mode
Note: in TDD mode, as both TX and RX are sent on the same channel, only TX1 and TX2
ports are needed.
However, with Amarisoft SDR card, it’s possible to force the DL signal reception on RX port
and Uplink signal transmission on TX port when rx_antenna: "rx" is set in the RF driver
configuration file.