On 09/15/2018 10:38 PM, Koyel Das (Vehere) wrote:
Hi,
Thanks for the information. Do I have to set any property in the gnu
radio uhd to phase lock the two oscillators to on board clock or they
are by default locked to it?
Nothing special to do. It happens automatically.
Can the external reference be gps? What settings need to be done in
UHD to sync the two oscillators to gps?
There's a good knowledge-base article on this and many other topics here:
https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices
Actually I am receiving a stationary signal using two ports TX/RX and
RX2 but I am not getting a constant phase difference with time. It can
happen if two oscillators are not synced .
The starting phase between the two sides will not be anything in particular.
But after that, they'll have a constant phase difference. What are you
using to measure the phase different between the two channels.
How is the signal delivered to the two channels?
Can you share your Gnu Radio flow-graph?
Please help.
------------------------------------------------------------------------
*From:* USRP-users <usrp-users-boun...@lists.ettus.com> on behalf of
Marcus D. Leech via USRP-users <usrp-users@lists.ettus.com>
*Sent:* Sunday, September 16, 2018 5:10:23 AM
*To:* usrp-users@lists.ettus.com
*Subject:* Re: [USRP-users] Sampler clock common or not?
On 09/15/2018 01:35 AM, Koyel Das (Vehere) via USRP-users wrote:
Hi,
I am using USRP 2954R. I have connected one antenna to RX2 of RF0 and
another antenna to TX/RX of RF1. Both are used for receiving. Can
someone tell me if RX2 of RF0 and TX/RX of RF1 are phase locked that
is the signal received by the two have a constant phase difference
with time or not? Are the two LOs controlled by a common master
oscillator or two LOs run Independently?
Regards,
Koyel
Both synthesizers are phase-locked to either the on-board clock, or an
external reference clock, if you're using an external reference. So,
they'll
have no relative phase-drift with respect to one another (except for
thermal effects, but those have a very small magnitude).
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