[USRP-users] X310, 2 channel sample time and phase alignment
Marcus D. Leech
mleech at ripnet.com
Tue Sep 2 13:28:36 EDT 2014
On 09/02/2014 01:25 PM, Kemp, Elizabeth - 1008 - MITLL wrote:
> Thank you for the reply Marcus!
> I just plotted as a complex pair and it still doesn't have the proper
> phase alignment... I'm using UHD version 3.7.1.
Could you update to 3.7.2?
Also, how are you setting up the two channels? Are they on two
> *From:*USRP-users [mailto:usrp-users-bounces at lists.ettus.com] *On
> Behalf Of *Marcus D. Leech via USRP-users
> *Sent:* Tuesday, September 02, 2014 11:49 AM
> *To:* usrp-users at lists.ettus.com
> *Subject:* Re: [USRP-users] X310, 2 channel sample time and phase
> On 09/02/2014 11:23 AM, Kemp, Elizabeth - 1008 - MITLL via USRP-users
> I have a test set up where I am recording on both channels of an
> X310. I have the output of a signal generator connected to the
> channels through a splitter (and equal length cables). I am using
> the BasicRX Daughterboards (1-250 MHz).
> I have attached a screenshot from GRC of the WX GUI that shows a
> plot of the real samples, and the magnitude of the two channels.
> As you can see in the magnitude plot, the two channels seem to be
> time-aligned, but there is a huge phase offset between the two
> channels. I've observed that the phase offset varies across
> different frequencies.
> So my question is -- why is there a phase offset between the 2
> channels? Is there anything that can be done to correct it?
> Thanks for your help,
> USRP-users mailing list
> USRP-users at lists.ettus.com <mailto:USRP-users at lists.ettus.com>
> There may not be. In the past, the scope sink has had issues with
> proper phase display. If you plot it as a complex pair instead, it
> maintains proper phase
> Also, what version of UHD are you using?
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