Document# SCT-UM2A61VC
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6.2
TDD Mode
If the 2.4 mm loopback cable is not available, it is possible to perform the previous Loopback Test using TDD mode. This
approach eliminates the need for the loopback cable by leveraging the fact that some Tx to Rx path coupling occurs in
the TDD switch due to its limited (30 dB) isolation.
To use this approach, a configuration command will be required via the USB Control Interface.
Follow steps 1 to 7 (skipping step 6) in section 6.1 and resume with step 8 below,
8.
Connect a USB cable from the SC2444 USB Control Interface to a host computer.
9.
Using a terminal emulation program, issue the following command to the SC2444:
RFPATH:PATH 0 TDD
NOTE: Ensure the command is successfully processed with a response of “OK”.
10. Set the signal generator to 2 GHz with an output power level of -40 dBm.
11. Use the spectrum analyzer to monitor the output signal of “RX IF OUT” port. If successful, you should observe a
CW signal at 2 GHz.
