On 09/25/2019 05:16 AM, Cherif Diouf via USRP-users wrote:
Hello,
I am working with the X310 USRP. I have two identical custom blocks
feeding the RF frontends.
flowchart
-----------------
HW Block1 -> RF0-TX1 |---<
HW Block2 -> RF1-TX1 |---<
The system is synchronized to an external PPS reference. The sampling
rate is 200 MSps and the signal bandwidth is 160 MHz for both channels.
The two HW blocks start transmitting at the exactly same time. Time
resolution is 5ns.
In most cases the two outgoing RF signals present a 1ns time offset.
Which can be understood as a phase offset.
But From time to time there is a 6ns delay between the channels. I
assume this 6ns comprises the 1ns delay due to phase offset + 5 ns
delay due to misalignment of outgoing samples.
What could be the origin of this one sample misalignement? Is it a way
to fix it? Or working close to the limits of the device should such
behavior be expected?
Thanks in advance
Best Regards
Cherif
You're going to have to share more about your configuration, including:
- what daughtercards are you using in your X310?
- what do you mean by "hardware block" -- RFNoC? Is this a custom
block?
- Are you doing this with Gnu Radio or just UHD?
- What version of UHD are you running?
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