The task is to test multiple DUT's (sequentially) for Transmitter & Receiver testing in multiple unlicensed frequency bands supported by the DUT. I could connect a single RF Signal Generator to 2 DUT's either using a 2:1 Power Splitter or an SPDT RF Switch.
I understand that Port Isolation for Power Splitter is usually lower (~30dB?) compared to an RF Switch (~90dB?) between the 2 output ports. But I am curious (assuming all the ports are well terminated with 50 ohms attenuators), which would be a preferred way to test a particular DUT at a time?
I also understand the RF Switch + Controller assembly could be expensive, but I am trying to understand the application differences between the 2, accuracy-wise, or understand does the comparison even make sense.
The setup is fairly straigh forward, VSA/VSG connected to 2 to 1 splitter/combiner OR SPDT switch which is connected to 2 DUTs. Its a 2.4/5 GHz 802.11 abgn signal, testing Rx signal at -70 dBm sensitivity PER test and Tx signal at 20 dBm power level to measure Power & EVM. Again this will sequential test, where DUT1 gets tested first followed by DUT2.