Re: [USRP-users] Time alignment failure for four channels coherent receiver in X310

2018-07-30 Thread Jack Yang via USRP-users
Thank you so much!! Julian! Starting the RX streamer a little bit in the future works!! Now I can align 4 channels as coherent receiver with 50M sps without problem. Also thanks for Marcus's help All Best, Jack On Sun, Jul 29, 2018 at 12:49 PM, Julian Arnold wrote: > Hey, > > have you tried

Re: [USRP-users] Time alignment failure for four channels coherent receiver in X310

2018-07-29 Thread Marcus D. Leech via USRP-users
On 07/29/2018 03:23 PM, Jack Yang wrote: Hi Marcus, Even I used 1Msps or less than this sampling rate, I still saw this time alignment issue. When I am using GNURadio system with python script instead of using UHD API, I can run 10Msps for my 4 channel phase array receiver without any

Re: [USRP-users] Time alignment failure for four channels coherent receiver in X310

2018-07-29 Thread Julian Arnold via USRP-users
Hey, have you tried starting the RX streamer a little bit in the future, i.e change the following lines: stream_cmd.stream_now = true; stream_cmd.time_spec = uhd::time_spec_t(); to something like (out of the top of my head): stream_cmd.stream_now = false; stream_cmd.time_spec =

Re: [USRP-users] Time alignment failure for four channels coherent receiver in X310

2018-07-29 Thread Jack Yang via USRP-users
Hi Marcus, Even I used 1Msps or less than this sampling rate, I still saw this time alignment issue. When I am using GNURadio system with python script instead of using UHD API, I can run 10Msps for my 4 channel phase array receiver without any problems. My final goal is to have 50Msps for my 4

Re: [USRP-users] Time alignment failure for four channels coherent receiver in X310

2018-07-29 Thread Marcus D. Leech via USRP-users
On 07/29/2018 12:56 PM, Jack Yang wrote: Hi Marcus, Thanks for your mail. Yes, I am using 10GiGe interface to run the UHD C++ code. Any thoughts or suggestions? All Best, Jack On Sun, Jul 29, 2018 at 9:35 AM, Marcus D. Leech via USRP-users mailto:usrp-users@lists.ettus.com>> wrote:

Re: [USRP-users] Time alignment failure for four channels coherent receiver in X310

2018-07-29 Thread Jack Yang via USRP-users
Hi Marcus, Thanks for your mail. Yes, I am using 10GiGe interface to run the UHD C++ code. Any thoughts or suggestions? All Best, Jack On Sun, Jul 29, 2018 at 9:35 AM, Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > On 07/29/2018 12:52 AM, Jack Yang via USRP-users wrote:

Re: [USRP-users] Time alignment failure for four channels coherent receiver in X310

2018-07-29 Thread Marcus D. Leech via USRP-users
On 07/29/2018 12:52 AM, Jack Yang via USRP-users wrote: Hi, I have rewrote "rx_samples_to_file.cpp" for making four channel coherent receiver (phased-array receiver) in X310. When I executed my code, the terminal showed that *[ERROR] [STREAMER] The receive packet handler failed to

[USRP-users] Time alignment failure for four channels coherent receiver in X310

2018-07-28 Thread Jack Yang via USRP-users
Hi, I have rewrote "rx_samples_to_file.cpp" for making four channel coherent receiver (phased-array receiver) in X310. When I executed my code, the terminal showed that *[ERROR] [STREAMER] The receive packet handler failed to time-align packets. 1002 received packets were processed by the