We are using GNU radio with USRP E320 on radioconda (Windows) and we are working on a basic project. But we have an issue.
We want to receive RF signals and then transmit them, so we connect USRP Source block to USRP sink block on GNU Radio. And we connect a signal generator with pulse signal to RX2. Also for examine the out signal we connect TX/RX port to oscilloscope. To observe delay between input signal and output signal we also connect signal generator output to same oscilloscope.
In this case, we expect that, deterministic delay between RX signal and TX signal on oscilloscope. But, in our simulations, this was not deterministic. It was changed for every simulation. If I explain clearly:
1- We set the flowgraph and RF connections to USRP and play the flowgraph. And we saw two signal on oscilloscope which are signal generator (go to RX signal) and TX signal. We measure the time delay between these signals. 2- Then stop the simulation on grc. 3- Then, never change anything and start again simulation and measure again between these two signal delay. This delay is different from first measurements.
We connect our USRP to laptop with 1GBe Ethernet.
Can you help us about this issue?
we expect that, deterministic delay between RX signal and TX signal on oscilloscope. But, in our simulations, this was not deterministic. It was changed for every simulation.
