Re: [USRP-users] How to save data from multiple USRPs?

[Rob Kossler via USRP-users]

The txrx_loopback_to_file example saves data on multiple rx channels.
Additionally, there is a utility called "kitchen_sink" in the tools folder
that can also do the trick.  This is not compiled by default so you will
have to do so manually.  However, it presently won't compile (error about
"msg_handler") so you can view it as an example or else debug/fix the
compile error if you want to run it.

Rob

On Fri, Sep 21, 2018 at 2:28 AM Kwansik Park via USRP-users <
usrp-users@lists.ettus.com> wrote:

> Hello!
>
> Now, I am trying to save data from multiple USRPs.
> Even though there is a file "rx_multi_samples.exe", as you know, it does
> not provide saving data.
> Is there anyone who can let me know how to deal with this problem?
>
> --
> *Kwansik Park*
> School of Integrated Technology, Yonsei University
> Yonsei Institute of Convergence Technology
> *Tel :* +82-749-5909
> *Fax :* +82-32-818-5801
> *Mobile :* +81-10-2328-6469
> *E-mail :* kwansikp...@yonsei.ac.kr
>  maxbraker6...@gmail.com
> *Homepage :* http://gnss.kr/kwansik
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>
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[USRP-users] PCIe driver frame size

[Eugene Grayver via USRP-users]

Is there  a way to specify the frame size on the PCIe interface?  I tried using 
the same keywords as for the NIC, but it had no effect.  I need low-latency and 
the default frame size is 5000 bytes (much too large for my needs).

___
Eugene Grayver, Ph.D.
Aerospace Corp., Principal Eng.
Tel: 310.336.1274


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[USRP-users] Primary/secondary interface on X310

[Eugene Grayver via USRP-users]

How are packets routed on the primary/secondary interfaces on the x310?  Is 
there a way to have packets to/from channel1 go on one interface and channel2 
on another? This would enable me to setup the NIC queues such that each queue 
handles one channel, which would then enable me to configure IRQs to specific 
cores on the CPU.

___
Eugene Grayver, Ph.D.
Aerospace Corp., Principal Eng.
Tel: 310.336.1274


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Re: [USRP-users] Primary/secondary interface on X310

[Marcus D. Leech via USRP-users]

On 09/21/2018 02:48 PM, Eugene Grayver via USRP-users wrote:


How are packets routed on the primary/secondary interfaces on the 
x310?  Is there a way to have packets to/from channel1 go on one 
interface and channel2 on another? This would enable me to setup the 
NIC queues such that each queue handles one channel, which would then 
enable me to configure IRQs to specific cores on the CPU.


___
Eugene Grayver, Ph.D.
Aerospace Corp., Principal Eng.
Tel: 310.336.1274




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See the notes in the knowlege based about dual 10Gig:

https://files.ettus.com/manual/page_usrp_x3x0.html#x3x0_hw_10gige


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[USRP-users] USRP E313 | WBFM Issues

[Ryan Campiz via USRP-users]

Ryan Campiz 
Thu, Sep 20, 5:21 PM (21 hours ago)
to support

Greetings,

I'm having trouble with a basic Wide-Band FM (WBFM) demodulation tutorial.
I am using the Ettus USRP E313. The Ettus USRP E313 is basically an
enclosure with an Ettus E310 and Power/Ethernet PCB with the RF, DC Power,
Ethernet, and USB ports.
FM DEMODULATION TUTORIAL

In my application, as the host machine, I am using a Virtual Machine with
Ubuntu 16.04 (64-bit). I downloaded all of the software as instructed in
the AN-445 Ettus Application Note.

In my application, the tutorial that I am following is from the AN-335
Application Note from Ettus. The tutorial is not complicated. I downloaded
the Flowgraph files that the tutorial comes with. When I generate both
python files and run them respectively on the E310 and the Host Machine,
all I hear is static. I can see evidence of a received signal on the
Frequency Spectrum graph, but I only hear static. What’s more, as I vary
the radio frequency, I do see the Frequency Spectrum graph change, but I
see no evidence of any FM Radio Stations.
DETOUR: DEMONSTRATING I COULD AT LEAST HEAR A 1KHZ TONE FROM THE E310

Just to make sure that it was possible to hear anything from the E310, I
created a simple flowgraph for the E310. All it did was generate a Signal
Source: a tone of 1kHz. On the other end, with the VM, I had an Audio Sink
and a Time Graph and Waterfall Diagram. I was able to hear the tune. But it
was choppy. And there was latency with the controls. A system block diagram
of this set-up can be seen below.
[image: image.png]
LAST EFFORTS AND SPECULATION

After demonstrating that I could hear at least a tone, I moved back to the
FM Demodulation Tutorial. I tried for a day to get it to run. After no
success, I used other resources to try to find where the process could be
going wrong. Once such resource is the YouTube video "How To Build an FM
Receiver with the USRP in Less Than 10 Minutes". That YouTube video is made
by Ettus Research.  It was well-produced and easy to follow. However, even
after watching it several times I could not locate what could be going
wrong in the RF Demodulation flowgraph.

I am so uncertain at this point that I am starting to wonder if either:

A.  the RF Front End is not working, or

B.  the OS image on the Ettus E310 is very slightly corrupted, or

C.  the FPGA is not programmed (built?) correctly.

What could be going wrong?




*Ryan Campiz*
Electrical/RF Engineer
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[USRP-users] Rssi reading on b205/b210

[Chintan Patel via USRP-users]

Hi,

Is there a function/script in the uhd driver to read the rssi for the
b205/b210?

Thanks
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Re: [USRP-users] Rssi reading on b205/b210

[Julian Arnold via USRP-users]

Hey, 

Since release 3.8.2 the RSSI is exposed as a frontend sensor.
You should be able to read it using the usual sensor read-back mechanism
(look at get_rx_senor_names and get_rx_sensor())

Cheers,
Julian

> On 21. Sep 2018, at 17:04, Chintan Patel via USRP-users 
>  wrote:
> 
> Hi,
> 
> Is there a function/script in the uhd driver to read the rssi for the 
> b205/b210?
> 
> Thanks
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