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Today's Topics:
1. USRP1 Question (Pan, Luyuan)
2. Re: USRP1 Question (Josh Blum)
3. Re: basic question about usrp (Nazmul Islam)
4. UHD examples (Rancid Fisch)
5. phase alignment (Christophe ALEXANDRE)
6. about adc reconstruction filter (???)
7. Re: about adc reconstruction filter (Matt Ettus)
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Message: 1
Date: Mon, 16 Jul 2012 10:16:34 +0800
From: "Pan, Luyuan" <[email protected]>
To: [email protected]
Subject: [USRP-users] USRP1 Question
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello,
I want to write some of my personal information into the USRP to
identify the equipment, (such as the total time I have used the USRP,
the last time it was used). Is that possible?
Should I use the EEPROM to record the information? Or can I use to
python to write the data or I need some dedicated software?
Thank you!
Best regards,
Luyuan PAN
------------------------------
Message: 2
Date: Sun, 15 Jul 2012 19:20:22 -0700
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] USRP1 Question
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 07/15/2012 07:16 PM, Pan, Luyuan wrote:
> Hello,
> I want to write some of my personal information into the USRP to
> identify the equipment, (such as the total time I have used the USRP,
> the last time it was used). Is that possible?
> Should I use the EEPROM to record the information? Or can I use to
> python to write the data or I need some dedicated software?
All that metadata, thats what external data bases are for :-)
You can use the unique serial to identify the USRP:
http://files.ettus.com/uhd_docs/manual/html/identification.html#identifying-usrps
Or give it a special name:
http://files.ettus.com/uhd_docs/manual/html/identification.html#naming-a-usrp
-josh
------------------------------
Message: 3
Date: Sun, 15 Jul 2012 23:28:08 -0400
From: Nazmul Islam <[email protected]>
To: Ahmed Alsawi <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] basic question about usrp
Message-ID:
<CAFtrfEY_qwch1Z9jqQj=681bwidU9W=pa8q6jvv1ax5-a4o...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello Ahmed,
USRP N Series consist of 400 MS/s DAC and 100 MS/s ADC's (
http://en.wikipedia.org/wiki/Universal_Software_Radio_Peripheral).
Decimation is done at the receiver USRP. Using FPGA programming, you can
work with 100 MS/s data. However, data rate coming to the computer is
limited by the Gigabit Ethernet Cable. The receiving data rate at the
computer is upper bounded by 25 MS/s if you use 32 bit floating point
complex numbers (16 for I & 16 for Q). You can receive data at a lower
rate, though. The decimation process drops out samples before sending to
the computer and converting to your specified sampling rate.
---
Best,
Nazmul
On Sat, Jul 14, 2012 at 2:08 PM, Ahmed Alsawi <[email protected]>wrote:
> Hi All,
> I want to know the function of decimation in receiver. i understand that
> interpolation in transmission is to increase sample rate to 128 MS/s for
> DAC.
> is my understanding is right ? what decimation does ?
>
> also, is there a way to search the mailing list archive ?
>
> thanks for help.
>
> -Ahmed
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
--
Muhammad Nazmul Islam
Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.
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Message: 4
Date: Mon, 16 Jul 2012 11:34:53 +0200
From: Rancid Fisch <[email protected]>
To: [email protected]
Subject: [USRP-users] UHD examples
Message-ID:
<caomgnshpiuc9orxzyfj8qi9w8giepbgjauesvkdfk46nx_e...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Sorry for the novice level question...
Using Windows, I downloaded and installed the UHD installer package. This
created a file and folder structure in which (c:\ettus\uhd\bin\) I found
and used "uhd_find_devices.exe" and "uhd_usrp_probe.exe" to establish
communication with my N210. So far so good.
The same installer also placed some executable example files in
C:\ettus\uhd\share\uhd\examples\. As far as I can determine, it did not
install the source files for the executables. Fortunately, they can be
found on the Ettus website:
http://code.ettus.com/redmine/ettus/projects/uhd/repository/revisions/master/show/host/examples
However, the above URL contains at least one C++ source file for which I
cannot find its executable:
http://code.ettus.com/redmine/ettus/projects/uhd/repository/revisions/master/changes/host/examples/txrx_loopback_to_file.cpp
How do I create an executable from this file? Even though the instructions
on how to build UHD from source appear to be reasonably comprehensive, I
query whether it is necessary to jump through so many hoops in order to
compile txrx_loopback_to_file.cpp.
Please therefore describe what tools, files and steps are necessary in
order to create my own executable code from C++ source code examples. The
important point to note is that I do not wish to build UHD *per se*.
Thanks,
Rancid Fisch
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Message: 5
Date: Mon, 16 Jul 2012 11:53:12 +0200
From: "Christophe ALEXANDRE" <[email protected]>
To: <[email protected]>
Subject: [USRP-users] phase alignment
Message-ID: <1671A0E2279741ED862C849548490BB4@fletan>
Content-Type: text/plain; charset="iso-8859-1"
Hi all,
i'm trying to align in phase two cos signal using the following GRC flowgraph :
i have modified the .py file to align both LO :
self.cmd_time = self.uhd_usrp_source_0_0.get_time_now()
self.cmd_time = self.cmd_time + uhd.time_spec_t(1)
self.uhd_usrp_source_0_0.set_command_time(self.cmd_time)
self.uhd_usrp_source_0_0.set_center_freq(1e9, 0)
self.uhd_usrp_source_0_0.set_center_freq(1e9, 1)
self.uhd_usrp_source_0_0.clear_command_time()
but the phase is still not aligned. I suppose i need to align also
both CORDICs, but i don't know how to do this with GNURADIO.
any help is welcome !!
regards.
Christophe ALEXANDRE
Conservatoire National des Arts et M?tiers (CNAM)
Laboratoire CEDRIC-LAETITIA
D?partement EASY
Acc?s 11B niveau -1, Case 2D2P10
292 rue Saint Martin
75141 PARIS CEDEX 03
FRANCE
email : [email protected]
tel. 0140272699
mob. 0651087311
fax. 0140272994
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Message: 6
Date: Mon, 16 Jul 2012 21:00:00 +0800 (CST)
From: ??? <[email protected]>
To: [email protected]
Subject: [USRP-users] about adc reconstruction filter
Message-ID: <[email protected]>
Content-Type: text/plain; charset="gbk"
Dear everyone:
You see the signal out of DAC is discrete in amplitude and we need a
reconstruction filter to make the signal an analog signal. But in USRPs there
is not such a filter and the DAC chip does not contain such a filter. So is the
reconstruction filter implemented in the RF daughter board or somewhere else?
If I am wrong please correct me.
Best regards
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Message: 7
Date: Mon, 16 Jul 2012 08:13:59 -0700
From: Matt Ettus <[email protected]>
To: ??? <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] about adc reconstruction filter
Message-ID:
<CAN=1kn9qzqekpq1-u3wrhp-ydjxvtylt6wlopeh-wajndgw...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
The DAC reconstruction filters are on the daughterboards.
Matt
On Mon, Jul 16, 2012 at 6:00 AM, ??? <[email protected]> wrote:
> Dear everyone:
> You see the signal out of DAC is discrete in amplitude and we need a
> reconstruction filter to make the signal an analog signal. But in USRPs
> there is not such a filter and the DAC chip does not contain such a filter.
> So is the reconstruction filter implemented in the RF daughter board or
> somewhere else? If I am wrong please correct me.
>
> Best regards
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
------------------------------
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End of USRP-users Digest, Vol 23, Issue 15
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