USRP source starts to receive after certain samples

2021-06-16 Thread Huang Wei
Hi all, I am very new to Gnuradio and USRP, and I have a question about the code transmission delay between USRPs. I have two USRP E310 with UBX160 daughterboards. I send a sequence of code from one USRP using simple amplitude modulation, and receive it by another USRP. On the receiver side, I use

Re: USRP source starts to receive after certain samples

2021-06-16 Thread Marcus D Leech
Latency is pretty normal in digital systems. There’s buffering in Gnu Rsdio, in the kernel network and USB layers, and there are packetizing delays. There’s buffer in the radio and the DUC and DDC filters inherently ads group delay. Picoseconds? Really? EM waves in a vacuum propagate at ab

Any problems building and running GNU Radio 3.8.3.0 on Ubuntu 21.04?

2021-06-16 Thread Alex Humberstone
We got a new powerful Dell desktop for the lab here, and we want to put the latest Ubuntu 21.04 on it. But will GNU Radio 3.8.3.0 build from source and run properly on Ubuntu 21.04? Are there any known issues? Does anyone already have this running successfully? Thanks in advance for the help, and f

Re: USRP source starts to receive after certain samples

2021-06-16 Thread Nick Foster
I am guessing you mean X310, since E310 doesn't take daughterboards. You are seeing the effect of FIR filter delay in the USRP's halfband filters. You can confirm this by setting the sample rate to (for instance) 200Msps/511. The use of an odd factor will result in lower filter delay but increased

Re: Any problems building and running GNU Radio 3.8.3.0 on Ubuntu 21.04?

2021-06-16 Thread Marcus Müller
Hi Alex, that should work flawlessly[1]. Many GNU Radio developers use Ubuntu 21.04 on a day-to-day basis. It's no surprise, really, though: Within one release series, Jeff takes care that things continue to work on the same systems! And 3.8.2.0 is what Ubuntu 21.04 ships, anyway. Chances are