Dear I am using a B210 in a loopback configuration to achieve delay measurements. Currently, a basic software setup is made in GNU Radio Companion, consisting of a UHD: USRP Sink block (TX) and an UHD: USRP Source block (RX).
I generate a pulse every few milliseconds. When starting the flow, there is a clear delay between the transmitted pulse and the received pulse when visualised in a QT GUI Time sink. I suppose this is due to the delay between providing a sample to the USRP sink block and the actual transmission + the delay on the receiver side. Is there a method to make sure both sink and source blocks start at exactly the same time or at least can be visually synced? The delay seems to vary every time the flowgraph is run. In this loopback configuration, the delay between TX and RX should be 0. When adding a lengthy cable it should no longer match. In the sink and source blocks I have set the sync setting to PC Clock on next PPS, and left the start time at its default. Any ideas how to get a good sync? Best regards, Tim Vancauwenbergh
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