On 03/06/2019 12:06 AM, Koyel Das (Vehere) wrote:
Okay so is it enough to use timed tuning to get constant phase
difference each time?
Assuming that all your streams are within the same multi_usrp object,
coming from the same hardware device, yes, that should do it.
Koyel Das
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*From:* Marcus D. Leech <patchvonbr...@gmail.com>
*Sent:* Wednesday, March 6, 2019 10:14:56 AM
*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 11:40 PM, Koyel Das (Vehere) wrote:
Hi,
By tuning commands I understand you mean command of synchronization
for frequency tuning? But then in which other places I have to use
the timed commands like in gain, sample rate etc also do I have to
use timed commands? If so what are those commands? I am not getting a
clear example of this.
Regards,
The tuning commands are the critical ones--because, as I explained,
that's when the synthesizers are programmed, and the
"resynch" pulse has to happen at the same time, hence, timed tuning.
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/>/
/
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(1) <https://twitter.com/VehereIndia>unnamed (2)
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*From:* Marcus D. Leech <patchvonbr...@gmail.com>
<mailto:patchvonbr...@gmail.com>
*Sent:* Wednesday, March 6, 2019 9:49:57 AM
*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 11:17 PM, Koyel Das (Vehere) wrote:
So basically I have to insert the following line
usrp->set_command_time(cmd_time);
before the code where I need timed operations and then at the end of
the code I insert
usrp->clear_command_time();
??
The tuning commands in particular.
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/>/
/
/unnamed
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(1) <https://twitter.com/VehereIndia>unnamed (2)
<https://www.facebook.com/VehereIndia/>
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Company Awards in India & Asia since 2012!/
The content of this e-mail is confidential and intended solely for
the use of the addressee. The text of this email (including any
attachments) may contain information, which is proprietary and/or
confidential or privileged in nature belonging to Vehere Interactive
Pvt Ltd and/or its associates/ group companies/ subsidiaries. If you
are not the addressee, or the person responsible for delivering it
to the addressee, any disclosure, copying, distribution or any
action taken or omitted to be taken in reliance on it is prohibited
and may be unlawful. If you have received this e-mail in error,
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*From:* Marcus D. Leech <patchvonbr...@gmail.com>
<mailto:patchvonbr...@gmail.com>
*Sent:* Wednesday, March 6, 2019 9:22:22 AM
*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 10:41 PM, Koyel Das (Vehere) wrote:
The timed commands are as follows in rx_multisamples.cpp
if(sync=="now"){
//This is not a true time lock, the devices will be off by a few RTT.
//Rather, this is just to allow for demonstration of the code below.
usrp->set_time_now(uhd::time_spec_t(0.0));
}
else if (sync == "pps"){
usrp->set_time_source("external");
usrp->set_time_unknown_pps(uhd::time_spec_t(0.0));
boost::this_thread::sleep(boost::posix_time::seconds(1)); //wait
for pps sync pulse
}
else if (sync == "mimo"){
UHD_ASSERT_THROW(usrp->get_num_mboards() == 2);
//make mboard 1 a slave over the MIMO Cable
usrp->set_clock_source("mimo", 1);
usrp->set_time_source("mimo", 1);
//set time on the master (mboard 0)
usrp->set_time_now(uhd::time_spec_t(0.0), 0);
//sleep a bit while the slave locks its time to the master
boost::this_thread::sleep(boost::posix_time::milliseconds(100));
}
1. "now", 2 ."pps" and 3. "mimo"
I was using "now" but still I don't get same phase difference in
each run. Is there any other time command that I have to use or
what do I have to set?
Regards,
Ah! You have a misunderstanding about what I mean by "timed commands".
See the "test_timed_commands" example in the source code tree.
See also the documentation here:
https://files.ettus.com/manual/page_sync.html
Basically, you need to make sure that all the devices agree on what
time it is (if you have only one device, this is "easy"). Once you
have that,
THEN, you need to make sure that all the RF synthesizer tuning
happens at precisely the same instant, so that the re-synch feature
(if the device has one) can be triggered at exactly the same time.
Without that, the synthesizers are free to "lock" at any phase-angle
with respect to the reference clock, and further the reference
divider in a synthesizer is guaranteed to be in the same state
across all synthesizers, even when they're using the same
reference clock. This is what the "resynch" hardware signal is
all about, and what the set_command_time()/clear_command_time()
API is all about.
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