I want to know the time it takes to transmit and receive the signal,(which is in the sense delay). I calculate this based on the time instant I receive the signal. Since I was receiving the signal at different time instants. And currently I am receiving the delay of 1.9e-4sec, 2.3e-4, 2.1e-4s...so on. So I was just wondering is it common to receive this. And also with the cable length of 20cm I expect the delay to be in µs. Isn't it higher delay?. And I am transmitting a signal of 300µs continuously with 20MHz sampling rate. I dont know if I clear enough with my explanation. Can you be specific, if more details required.
Regards, Sneha On Thu, Aug 8, 2019 at 9:51 PM Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > On 08/08/2019 01:32 PM, Michael Dickens via USRP-users wrote: > > Hi Sneha - Please "reply all" to keep the discussion on the USRP users > email list. More eyes reading these means a greater chance that folks will > jump in to help! > > The startup time for UHD / USRP / GR will be very similar between > different runs of the exact same flowgraph, but not exactly the same. If > you were to somehow measure these and plot them, I'd bet you'd get a curve > that looks Gaussian except with limits (a "truncated normal distribution"). > The exact same file being Tx'd over and again will have a slightly > different delay on Tx each time. > > Not sure this is what you're experiencing. If you don't think it is, then > please provide more information; what we have right now is pretty thin. > > Hope this is useful! - MLD > > I was going to make the same general comment--we don't have enough > information about exactly *what* you mean by "delay", and exactly > how you're measuring it. > > It's nearly impossible to get predictable-and-repeatable fine-scale > latency on a software-based system running on a general-purpose > operating-system like Linux or Windows. If your system-design requires > this to be so, then you have a problem with your system design. > > > On Thu, Aug 8, 2019, at 11:38 AM, Sneha vasan wrote: > > Hi Michael, > > I sent a email before I confirmed the subscription for the usrp users. So > I was wondering if I could receive the email back if replied in usrp lists. > So just forwarded once again just to be sure. Probably I would have put a > note there. > > I am generating the signal using Matlab and store it in a file and then > send it to the USRP using gnu-radio. So now when I make multiple recordings > of the signal at different time , I am receiving the signal at varying > intial delay . I except the delay to be constant as I am send same signal > and with same parameters. > > Regards, > Sneha > > > > > _______________________________________________ > USRP-users mailing > listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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