Hi Rob, Looking into the zbx_cpld_ctrl.cpp it looks like the RX Ant1 switch is not moved away from the TX/RX port: https://github.com/EttusResearch/uhd/blob/master/host/lib/usrp/dboard/zbx/zbx_cpld_ctrl.cpp#L322-L325 and https://github.com/EttusResearch/uhd/blob/master/host/lib/usrp/dboard/zbx/zbx_cpld_ctrl.cpp#L276-L277
For the TX part I’d have to look up what the amplifiers in the antenna settings mean exactly, though. /Martin From: Rob Kossler via USRP-users <[email protected]> Sent: Monday, September 15, 2025 10:23 PM To: usrp-users <[email protected]> Subject: [EXTERNAL] [USRP-users] Rx antenna Tx/Rx with full duplex streaming state Hi, I am wondering if anyone knows what happens with the Tx and Rx switches in the case of the Rx antenna setting of Tx/Rx for a full-duplex streaming state. In particular, I'm interested in the case of the X410/ZBX where the switches in question are Sw 1 (Rx) and Sw 11 (Tx). It seems that if the streaming state were Rx only, both of these switches would route the Tx/Rx0 port to the Rx path. But, for the case of simultaneous Tx/Rx streaming, I expect that Sw 11 (Tx) is changed to the Tx path. What I'm unclear about is what happens to Sw 1 (Rx). Does this change to the Rx1 port or does it remain on the Tx/Rx0 port? Rob
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