Re: [USRP-users] Time synchronization of multiple B210s not working with multiple channels

2020-02-27 Thread Michael Wentz via USRP-users
Hi Ian, To answer your questions: - The absolute times after run are around the 6 second mark as expected, just with some additional 10s to 100s of microseconds that appears random on each B210. - All of the B210s are powered by the 5.9V 4.0A adapter they came with. Now some good news: I think I'

Re: [USRP-users] Time synchronization of multiple B210s not working with multiple channels

2020-02-26 Thread Ian Buckley via USRP-users
This is a particularly curious problem. The offset between B210’s of the “time after run” values after sample capture has completed is very hard to explain…certainly from a hardware only perspective. What are the absolute time values reported? Are they at least approximately 5-6 seconds as you m

Re: [USRP-users] Time synchronization of multiple B210s not working with multiple channels

2020-02-26 Thread Michael Wentz via USRP-users
Thanks Marcus. I've done a little more debugging with a simple C++ example and the B210, and discovered that calling get_rx_stream() seems to be slightly changing the device time by random amounts when 2 channels are used. It doesn't matter if I actually issue a stream command or collect any data.

Re: [USRP-users] Time synchronization of multiple B210s not working with multiple channels

2020-02-25 Thread Marcus D. Leech via USRP-users
On 02/25/2020 09:33 AM, Michael Wentz via USRP-users wrote: Marcus, Thanks for the suggestion. I added set_subdev_spec('A:A A:B') for the 2 channel case, but the results are the same. I also tried this code with a pair of X310s receiving. The results are somewhat similar: - Channel 0 (A:0)

Re: [USRP-users] Time synchronization of multiple B210s not working with multiple channels

2020-02-25 Thread Michael Wentz via USRP-users
Marcus, Thanks for the suggestion. I added set_subdev_spec('A:A A:B') for the 2 channel case, but the results are the same. I also tried this code with a pair of X310s receiving. The results are somewhat similar: - Channel 0 (A:0) across 2 devices: no delay - Channel 1 (B:0) across 2 devices: no

Re: [USRP-users] Time synchronization of multiple B210s not working with multiple channels

2020-02-24 Thread Marcus D. Leech via USRP-users
On 02/24/2020 05:10 PM, Michael Wentz via USRP-users wrote: Hi, I'm trying to synchronize multiple B210s to receive data at the same time. I'm only concerned about sample time alignment across devices, and am aware there is a phase offset that will need to be calibrated out separately. I've h

[USRP-users] Time synchronization of multiple B210s not working with multiple channels

2020-02-24 Thread Michael Wentz via USRP-users
Hi, I'm trying to synchronize multiple B210s to receive data at the same time. I'm only concerned about sample time alignment across devices, and am aware there is a phase offset that will need to be calibrated out separately. I've had success with 1 RX channel across 2 B210s, but something seems