On 03/05/2019 10:28 PM, Koyel Das (Vehere) wrote:
"I'm not familiar with the 2964R, so can't personally comment on it."
Sorry I meant 2954 R. Does it also have LO sharing or that is not
required in that?
Regards,
That model is based on the UBX transceiver card, which doesn't have LO
sharing, but using timed commands can cause the two
synthesizers to come into phase alignment.
Koyel Das
Senior – Product Engineer
Vehere | Proactive Communications Intelligence & Cyber Defence
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*From:* Marcus D. Leech <patchvonbr...@gmail.com>
*Sent:* Tuesday, March 5, 2019 9:57 PM
*To:* Koyel Das (Vehere); 'USRP-users@lists.ettus.com'
*Subject:* Re: [USRP-users] different phase difference using splitter
on each run
On 03/05/2019 11:21 AM, Koyel Das (Vehere) wrote:
So they don’t share same master oscillator? Is this true for 2964R as
well?
Do you mean the reference clock on the board? They all share that,
but each channel has its own LO synthesizer.
I'm not familiar with the 2964R, so can't personally comment on it.
You can achieve 4-channel phase coherence with the TwinRx--see the APP
Note here:
https://kb.ettus.com/Direction_Finding_with_the_USRP%E2%84%A2_X-Series_and_TwinRX%E2%84%A2
Koyel Das
Senior – Product Engineer
Vehere | Proactive Communications Intelligence & Cyber Defence
M: +919051132173 | T: +91 33 40545454 | F: +91 33 40545455 | W:
www.vehere.com <http://www.vehere.com>
Vehere is the proud recipient of the Fastest Growing Technology
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*From:* Marcus D. Leech <patchvonbr...@gmail.com>
<mailto:patchvonbr...@gmail.com>
*Sent:* Tuesday, March 5, 2019 9:49:28 PM
*To:* Koyel Das (Vehere); 'USRP-users@lists.ettus.com
<mailto:USRP-users@lists.ettus.com>'
*Subject:* Re: [USRP-users] different phase difference using splitter
on each run
On 03/05/2019 11:10 AM, Koyel Das (Vehere) wrote:
Are RX1 and RX2 of RF0 controlled by same master oscillator? Will
connecting two antennas to RX1 and RX2 of RF0, rather than to RX1 of
RF0 and to RX1 of RF1, give same phase difference between these two
channels at every run?
All channels have their own LO.
The TwinRx has LO sharing mode.
Koyel Das
Senior – Product Engineer
Vehere | Proactive Communications Intelligence & Cyber Defence
M: +919051132173 | T: +91 33 40545454 | F: +91 33 40545455 | W:
www.vehere.com <http://www.vehere.com>
Vehere is the proud recipient of the Fastest Growing Technology
Company Awards in India & Asia since 2012!
The content of this e-mail is confidential and intended solely for
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*From:* USRP-users <usrp-users-boun...@lists.ettus.com>
<mailto:usrp-users-boun...@lists.ettus.com> on behalf of Marcus D.
Leech via USRP-users <usrp-users@lists.ettus.com>
<mailto:usrp-users@lists.ettus.com>
*Sent:* Tuesday, March 5, 2019 7:03:42 PM
*To:* usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>
*Subject:* Re: [USRP-users] different phase difference using
splitter on each run
On 03/05/2019 06:01 AM, Koyel Das (Vehere) via USRP-users wrote:
Hi,
I am using USRP 2955 R and I have connected an antenna to one end
of a two channel splitter and connected the other two ports of the
splitter to the two RX1 pors of USRP. I am getting different phase
difference in each run of USRP though in one particular run the
phase difference is constant for all channels. The tuned frequency
is 2.4 GHz and sampling rate is 1 MSps so as expected that channel
phase differences are almost same. But when I stop acquiring data
and restart it using gnuradio or the API, then I am getting again a
new value of phase difference across all channels, which is again
same across channels. Is USRP so unstable that it gives different
value of phase difference for each run for the same frequency, and
sampling rate? The setup in the runs are also the same.
Regards,
Koyel
Koyel Das
Senior – Product Engineer
Vehere | Proactive Communications Intelligence & Cyber Defence
M: +919051132173 | T: +91 33 40545454 | F: +91 33 40545455 | W:
www.vehere.com <http://www.vehere.com/>/
/
/
/This isn't about "instability". It's about the way PLL
synthesizers work, and the fact that by default each channel is
using its own synthesizer.
There are a few things that need to happen:
All the channels you're receiving need to be in the same
multi_usrp block, which, among other things, is a conceptual
"synchronization domain".
Use timed-commands for tuning (which is a bit awkward to arrange
in Gnu Radio, you'll have to modify the generated code). This will
arrange
for the synthesizers to be given a "resynch" signal at exactly
the same time.
OR
Use the "shared LO" features of the TwinRX cards that are on the
2955.
See the knowledge-base document on the TwinRX and
phase-synchronization here:
https://kb.ettus.com/TwinRX
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this communication entirely from your system. The recipient
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completeness and accuracy of the content of the email. The
recipient further acknowledges that the views contained in the
email message are those of the sender and may not necessarily
reflect those of Vehere Interactive Pvt Ltd. Before opening and
accessing the attachment please check and scan for virus. WARNING:
Computer viruses can be transmitted via email. The recipient should
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