Send USRP-users mailing list submissions to
[email protected]
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
or, via email, send a message with subject or body 'help' to
[email protected]
You can reach the person managing the list at
[email protected]
When replying, please edit your Subject line so it is more specific
than "Re: Contents of USRP-users digest..."
Today's Topics:
1. Re: USRP2 Antenna for 2.4GHz-2.5GHz (Roland Awusie)
2. Re: USRP2 Antenna for 2.4GHz-2.5GHz (Martin Braun)
3. Re: problem with USRP example on X310 with CBX-120 (Jim Hunziker)
----------------------------------------------------------------------
Message: 1
Date: Sun, 26 Oct 2014 22:52:08 -0600
From: Roland Awusie <[email protected]>
To: Martin Braun <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] USRP2 Antenna for 2.4GHz-2.5GHz
Message-ID:
<CAGdF4G4pSXmye=zl2rtjrxthsy4x4hy1z2hnvdjc3e0gbrt...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Thank you for your inputs on antenna specifications. I have purchased
VERT2450 antenna and have started sampling spectrum from 2.4-2.5G without
issue.
I will be grateful if anyone can direct me to the best method of saving the
data file for post processing.I planed to use matlab for data plotting.
Note: I'm using Fedora 20 for my setups
Below is an error when saving to my desktop:
2014-10-26 21:24:25.633908 center_freq 131875000.0 freq 136931250.0
power_db 5.13903565433 noise_floor_db -112.39561846
2014-10-26 21:24:25.633951 center_freq 131875000.0 freq 136937500.0
power_db 6.36556793556 noise_floor_db -112.39561846
2014-10-26 21:24:25.634003 center_freq 131875000.0 freq 136943750.0
power_db 6.02607535687 noise_floor_db -112.39561846
2014-10-26 21:24:25.634051 center_freq 131875000.0 freq 136950000.0
power_db 5.87288377969 noise_floor_db -112.39561846
2014-10-26 21:24:25.634095 center_freq 131875000.0 freq 136956250.0
power_db 6.65514846436 noise_floor_db -112.39561846
2014-10-26 21:24:25.634138 center_freq 131875000.0 freq 136962500.0
power_db 5.62646803529 noise_floor_db -112.39561846
2014-10-26 21:24:25.634182 center_freq 131875000.0 freq 136968750.0
power_db 5.3952983101 noise_floor_db -112.39561846
^C[rawusie@localhost uhd]
error in bold:
[rawusie@localhost uhd]$ ./usrp_spectrum_sense.py --args
"addr=192.168.10.3" 25M 230M --fft 1024 > ~/home/rawusie/Desktop/log.txt
*bash: /home/rawusie/home/rawusie/Desktop/log.txt: No such file or
directory*
Thank you,
Roland
On Mon, Oct 13, 2014 at 9:00 PM, Roland Awusie <[email protected]>
wrote:
> Hi All,
>
> Thank you all for helping me in this direction. I have decided to order
> two VERT2450 antennas to meet my sampling frequency requirements. Hoping
> all goes well without additional issues.
>
> Thanks,
> Roland
>
> On Tue, Oct 7, 2014 at 12:33 PM, Martin Braun via USRP-users <
> [email protected]> wrote:
>
>> On 10/07/2014 07:17 PM, Michael Schwingen via USRP-users wrote:
>> > On 07.10.2014 17:54, Martin Braun via USRP-users wrote:
>> >> Roland,
>> >>
>> >> the VERT2450 will do both 2.4 and 5 GHz bands, you can get it via our
>> >> web site. You can connect anything with an SMA connector, so if you
>> want
>> >> to go really cheap, you could build your own antenna (see, e.g.
>> >>
>> http://www.makeuseof.com/tag/how-to-make-a-wifi-antenna-out-of-a-pringles-can-nb/
>> ).
>> >>
>> > Not sure if this is a good idea - AFAIR, Oliver Bartels did some
>> > measurements on pringles-based cantennas in the german c't magazine and
>> > came to the result that it worked noticeably worse than a properly sized
>> > waveguide cantenna.
>>
>> That was just a random Google search -- maybe I should have checked it
>> more carefully. What's definitely true is that if money is an issue, you
>> can build an antenna.
>>
>> Have fun, everyone,
>> M
>>
>> _______________________________________________
>> USRP-users mailing list
>> [email protected]
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20141026/5add5a43/attachment-0001.html>
------------------------------
Message: 2
Date: Mon, 27 Oct 2014 09:20:34 +0100
From: Martin Braun <[email protected]>
To: "'[email protected]'" <[email protected]>
Subject: Re: [USRP-users] USRP2 Antenna for 2.4GHz-2.5GHz
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
On 10/27/2014 05:52 AM, Roland Awusie wrote:
> Thank you for your inputs on antenna specifications. I have purchased
> VERT2450 antenna and have started sampling spectrum from 2.4-2.5G
> without issue.
>
> I will be grateful if anyone can direct me to the best method of saving
> the data file for post processing.I planed to use matlab for data plotting.
If you have GNU Radio installed, you can uhd_rx_cfile to record to disk
and make use of the tools in gnuradio/gr-utils/octave to read the data
into your Matlab workspace.
Without installing anything, the example rx_samples_to_file can be used.
It saves files as binary data.
Matlab of course comes with Simulink drivers for USRPs. You might be
able to use those, too.
M
------------------------------
Message: 3
Date: Mon, 27 Oct 2014 10:48:24 -0400
From: Jim Hunziker <[email protected]>
To: Michael West <[email protected]>
Cc: usrp-users <[email protected]>
Subject: Re: [USRP-users] problem with USRP example on X310 with
CBX-120
Message-ID:
<cagh06jvrrrezcw5q0-angfoirbbodbic3j8yjyhlr9c-pv+...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Thanks. It looks like this patch isn't against 3.7.3. We're not running
against the master branch right now. Is this patch intended for 3.8-rc?
--
Jim Hunziker
BCI Systems and Software Engineering
(973) 348-9299
[email protected]
On Fri, Oct 24, 2014 at 5:55 PM, Michael West <[email protected]>
wrote:
> Hi Jim,
>
> An experimental UHD patch was sent to your colleague to address the
> calibration issue. Please let me know if you need the patch sent to you
> directly and I will get it to you.
>
> Best regards,
> Michael
>
> On Thu, Oct 23, 2014 at 10:40 AM, Jim Hunziker via USRP-users <
> [email protected]> wrote:
>
>> Marcus Leech responded to me off-list that I was using gain settings that
>> were too low. Setting them to 10 greatly improved my signal, though there's
>> still a carrier component that's bigger than my signal and not getting
>> removed. A colleague tells me he's working with Ettus regarding this
>> problem.
>>
>>
>> --
>> Jim Hunziker
>> BCI Systems and Software Engineering
>> (973) 348-9299
>> [email protected]
>>
>> On Wed, Oct 22, 2014 at 4:42 PM, Jim Hunziker <[email protected]>
>> wrote:
>>
>>> It looks like some of my problem was plotting abs(sig_c) rather than
>>> real(sig_c), but the signal still doesn't look great.
>>>
>>>
>>> --
>>> Jim Hunziker
>>> BCI Systems and Software Engineering
>>> (973) 348-9299
>>> [email protected]
>>>
>>> On Wed, Oct 22, 2014 at 12:15 PM, Jim Hunziker <[email protected]
>>> > wrote:
>>>
>>>> Hi. I have an X310 with a CBX-120 and a GPSDO, and I'm running the
>>>> txrx_loopback_to_file example with UHD version 3.7.3 like this:
>>>>
>>>> ./txrx_loopback_to_file --tx-args addr=10.10.10.90 --nsamps=250000
>>>> --tx-rate 2500000 --rx-rate 2500000 --tx-freq 56000000
>>>> 00 --rx-freq 5600000000 --rx-ant CAL --wave-type SINE --ref internal
>>>> --wave-freq 1000
>>>>
>>>> (It makes no difference if I use the RX2 antenna and a loopback cable.)
>>>>
>>>> With a sampling rate of 2.5 MHz and a sine wave of 1 KHz, I expect to
>>>> see a sinusoidal cycle every 2500 samples. I'm plotting them with GNU
>>>> Octave and the following commands:
>>>>
>>>> fid = fopen("~/uhd/host/build/examples/usrp_samples.dat", "rb");
>>>> [sig, count] = fread(fid, Inf, "int16");
>>>> sig_c = sig(1:2:end) + j * sig(2:2:end);
>>>> plot(abs(sig_c));
>>>>
>>>> The signal seems very noisy, and it's pretty much gone towards the end
>>>> of the capture. Am I doing something wrong?
>>>>
>>>> --
>>>> Jim Hunziker
>>>> BCI Systems and Software Engineering
>>>> [email protected]
>>>>
>>>
>>>
>>
>> _______________________________________________
>> USRP-users mailing list
>> [email protected]
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20141027/80539cdb/attachment-0001.html>
------------------------------
Subject: Digest Footer
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
------------------------------
End of USRP-users Digest, Vol 50, Issue 27
******************************************
