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Today's Topics:
1. GPSDO loss of satellite question ([email protected])
2. Re: GPSDO loss of satellite question (Marcus D. Leech)
3. Connectors and antenna (Medhat Hamdy)
4. ISWCS 2013 Call for Demonstrations Deadline Extended to May
17 (Andre Puschmann)
5. Re: USRP Digital output Signal (Tim Pitman)
6. Re: Connectors and antenna (Tim Pitman)
7. QPSK Demodulator using GRC (ZaInzAiN Jj)
8. OFDM implemetation, use python script or GRC? (ZaInzAiN Jj)
9. OFDM implementation, use python script or GRC? (ZaInzAiN Jj)
10. Re: QPSK Demodulator using GRC (Robert Watson)
----------------------------------------------------------------------
Message: 1
Date: Mon, 13 May 2013 13:33:08 -0230
From: <[email protected]>
To: <[email protected]>
Subject: [USRP-users] GPSDO loss of satellite question
Message-ID: <[email protected]>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I have a question about if there is a case where the GPS satellite is not
available to the GPSDO board.
I understand that with the GPSDO board I would be able to put two receivers
in two separate locations and they would both get the same timing signal.
If the GPSDO modules were to lose the satellite signal for some reason would
they still be able to provide a 10 MHz reference? Or is that if you don't
have a satellite signal the receivers just fallback to the onboard internal
clock.
I guess what I'm asking is what exactly happens with the timing if you have
a GPSDO module connected and it loses or is not receiving a signal from the
satellites?
Mike
------------------------------
Message: 2
Date: Mon, 13 May 2013 12:17:29 -0400
From: "Marcus D. Leech" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] GPSDO loss of satellite question
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> I have a question about if there is a case where the GPS satellite is
> not available to the GPSDO board.
>
> I understand that with the GPSDO board I would be able to put two
> receivers in two separate locations and they would both get the same
> timing signal. If the GPSDO modules were to lose the satellite signal
> for some reason would they still be able to provide a 10 MHz
> reference? Or is that if you don't have a satellite signal the
> receivers just fallback to the onboard internal clock.
>
> I guess what I'm asking is what exactly happens with the timing if you
> have a GPSDO module connected and it loses or is not receiving a
> signal from the satellites?
>
> Mike
>
>
The way GPSDOs work is that there's an internal clock, usually of quite
high quality. The GPS satellite signals are used to provide estimates of
timing slip between the on-board clock and the satellites. Assuming
that the on-board clock on the GPSDO has recently been "in synch", it will
slowly drift out-of-synch according to it's "natural" proclivities as
a piezoelectric crystal oscillator of reasonably high quality. Once the
satellites
come back, it will be caused to drift back into synchronization with
the satellites.
>
>
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
------------------------------
Message: 3
Date: Mon, 13 May 2013 22:27:30 -0700 (PDT)
From: Medhat Hamdy <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] Connectors and antenna
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="us-ascii"
Hi all,
I do not fully understand the connection between the connectors on the daughter
boards and the RF connectors of the antennas. I am using USRP N210 with SBX
daughter board. I want to know which antenna is used for transmission and/or
reception.
Thanks
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Message: 4
Date: Tue, 14 May 2013 09:54:59 +0200
From: Andre Puschmann <[email protected]>
To: "[email protected]" <[email protected]>,
[email protected], [email protected],
[email protected]
Subject: [USRP-users] ISWCS 2013 Call for Demonstrations Deadline
Extended to May 17
Message-ID: <[email protected]>
Content-Type: text/plain; charset=windows-1252
Dear all --
please note that the submission deadline for the demonstration session
of the 10th ISWCS 2013 has been extended until this Friday, i.e. May 17
2013 (firm).
Looking forward to seeing you in Ilmenau
Andre Puschmann and Thomas Volkert
---------------------------------------------------------------------
Call for Demonstrations for ISWCS 2013
The Tenth International Symposium on Wireless Communication Systems
(ISWCS) to be held in Ilmenau, Germany, 27-30 August 2013 will offer the
invaluable opportunity to demonstrate novel, innovative and original
research in the area of Software Defined Radio/Cognitive Radio as well
as Future Internet technologies. The goal
of this demonstration session is to provide an opportunity to bridge the
gap between both research fields and to connect world-wide technical
researchers in both areas. Therefore, the session will welcome
contributions presenting novel and innovative demonstrations in one or
both of the above mentioned areas of interest.
Submission Requirements:
------------------------
The submissions should include an extended abstract of two pages in
accordance with the IEEE author guidelines. The authors should
explicitly state what will be demonstrated to the ISWCS audience, and
how the attendees will be able to interact, enjoy, and experiment. All
submissions must be submitted through EDAS.
The proposals will be evaluated by the ISWCS 2013 demo review committee
based on the following criteria:
? Relevance and novelty of the topic: How important and novel is the
proposed demonstration to the community?
? Interactivity and originality of the idea: What can the conference
attendees observe and how can they interact with the proposed demo?
The extended abstracts of accepted demonstrations will be included in
the proceedings of ISWCS 2013 and in the IEEE Xplore database. The
abstract should include a full list of authors with complete
affiliations. At least one author of each accepted demo is required to
register and present the demo at the conference.
Important Links:
----------------
- Conference website: http://www.iswcs2013.org
- EDAS submission: https://edas.info/newPaper.php?c=13295&track=32879
Important Dates:
----------------
? Demo proposal submission deadline: May 17, 2013
? Notification of acceptance: May 29, 2013
? Camera-ready version of demo papers: June 24, 2013
Demonstration Chairs:
---------------------
? Andre Puschmann, Ilmenau University of Technology, Germany
? Thomas Volkert, Ilmenau University of Technology, Germany
Demo Review Committee:
----------------------
? Martin Braun, Karlsruhe Institute of Technology, Germany
? Paul Sutton, CTVR, Trinity College, Ireland
? Joseph Gaeddert, Virginia Tech, USA
? Toma? ?olc, Jo?ef Stefan Institute, Slovenia
? Oliver Waldhorst, Karlsruhe Institute of Technology, Germany
? Paul M?ller, University of Kaiserslautern, Germany
? Thomas Magedanz, TU Berlin/Fraunhofer FOKUS, Germany
? Thomas Dreibholz, Simula Innovation AS, Norway
? Florian Liers, Ilmenau University of Technology, Germany
--
Andre Puschmann
Ilmenau University of Technology, Integrated Communication Systems Group
Cognitive Radio Network Group
Phone: +49 3677 69-4132, Fax: +49 3677 69-1614
Email: [email protected], Web: http://www.tu-ilmenau.de/crng
Office: Zuse Building, corridor f, room 1071
PGP/GnuPG key: 2C734140
fingerprint: 546F F71F 3185 0388 94C3 FA7A DDE6 00B9 2C73 4140
------------------------------
Message: 5
Date: Tue, 14 May 2013 00:55:27 -0700
From: Tim Pitman <[email protected]>
To: Mohammed Ramadan <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] USRP Digital output Signal
Message-ID:
<cacnfkzurs3mjkzh0fna+zzrjpdvdomuhos-kuaw_e3-e1iw...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Didn't realize I wasn't responding to the list. Here's the thread in case
it's useful to anyone else:
---------- Forwarded message ----------
From: Mohammed Ramadan <[email protected]>
Date: Mon, May 13, 2013 at 11:48 PM
Subject: Re: [USRP-users] USRP Digital output Signal
To: Tim Pitman <[email protected]>
Good. i will try with SBX. let's learn
--- On *Mon, 5/13/13, Tim Pitman <[email protected]>* wrote:
From: Tim Pitman <[email protected]>
Subject: Re: [USRP-users] USRP Digital output Signal
To: "Mohammed Ramadan" <[email protected]>
Date: Monday, May 13, 2013, 10:09 PM
I believe the TX LED will go on automatically when transmitting. However I
haven't tested this on an SBX, only a WBX
On May 13, 2013 1:11 AM, "Mohammed Ramadan"
<[email protected]<http://mc/[email protected]>>
wrote:
I am Sorry, I am fresh with USRP and work self study. i thought you asked
for the USRP device. now i have not the SBX it's with my friend, i have now
the XCVR2450 which not have the four leds you told me. I will see it in
SBX. but are you sure that i can do that with the SBX. I use python in
programming the USRP. so, through my code can i set this led to be on to
operate the micro-controller.
Best Regards,
M.Ramadan
--- On *Mon, 5/13/13, Tim Pitman
<[email protected]<http://mc/[email protected]>
>* wrote:
From: Tim Pitman
<[email protected]<http://mc/[email protected]>
>
Subject: Re: [USRP-users] USRP Digital output Signal
To: "Mohammed Ramadan"
<[email protected]<http://mc/[email protected]>
>
Date: Monday, May 13, 2013, 7:50 AM
I meant the SBX daughterboard :)
On Mon, May 13, 2013 at 12:44 AM, Mohammed Ramadan
<[email protected]<http://mc/[email protected]>
> wrote:
I am using USRPn210. i have no leds below Ettus Researach LLC. just have
two ends REF IN, PPS IN. , But i have 2 group of leds beside power Port
Leds(A,B,C,D,E,F)
and i know that A on while Transmitting, and B while Receiving.do you talk
about LEDs, A and B.Thanks for your reply.
Best Regards,
M.Ramadan
--- On *Mon, 5/13/13, Tim Pitman
<[email protected]<http://mc/[email protected]>
>* wrote:
From: Tim Pitman
<[email protected]<http://mc/[email protected]>
>
Subject: Re: [USRP-users] USRP Digital output Signal
To: "Mohammed Ramadan"
<[email protected]<http://mc/[email protected]>
>
Date: Monday, May 13, 2013, 6:42 AM
If you look on the board just below the words "Ettus Research LLC" you will
see 4 LEDs, which emit depending on the mode (I believe the 4 modes are
IDLE, TX, RX, and FULL DUPLEX). You should just need to connect your
microcontroller to the appropriate LED. You'll want to verify the voltage
though.
On Sun, May 12, 2013 at 11:33 PM, Mohammed Ramadan
<[email protected]<http://mc/[email protected]>
> wrote:
I have two Daugtherboards now one is XCVR2450, and the other is SBX, i can
use any one of them.thanks for your reply i will read more about the GPIO.
--- On *Mon, 5/13/13, Tim Pitman
<[email protected]<http://mc/[email protected]>
>* wrote:
From: Tim Pitman
<[email protected]<http://mc/[email protected]>
>
Subject: Re: [USRP-users] USRP Digital output Signal
To: "Mohammed Ramadan"
<[email protected]<http://mc/[email protected]>
>
Date: Monday, May 13, 2013, 5:33 AM
Which daughterboard are you using? The WBX has several GPIO pins which can
be used for things like this. I believe pin 15 is set high (3.3v) on TX.
The same thing can be accomplished on the SBX by tapping into one of the
LEDs. A bit more work but should do the trick.
On Sun, May 12, 2013 at 12:58 AM, Mohammed Ramadan
<[email protected]<http://mc/[email protected]>
> wrote:
I want to get from USRPn210 digital signal "1" when transmit, as i want
this digital signal to start micro-controller operation. so i want to know,
how to get the signal from the USRP by logic "1" or "0". Also how to
connect the USRP to the micro controller.
_______________________________________________
USRP-users mailing list
[email protected] <http://mc/[email protected]>
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
On Sun, May 12, 2013 at 12:58 AM, Mohammed Ramadan <[email protected]
> wrote:
> I want to get from USRPn210 digital signal "1" when transmit, as i want
> this digital signal to start micro-controller operation. so i want to know,
> how to get the signal from the USRP by logic "1" or "0". Also how to
> connect the USRP to the micro controller.
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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Message: 6
Date: Tue, 14 May 2013 00:57:02 -0700
From: Tim Pitman <[email protected]>
To: Medhat Hamdy <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Connectors and antenna
Message-ID:
<cacnfkztrusgitnyttjsab-yxosx-10t4sb08snfbinjv0xy...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
To the list this time...
TX/RX can be used for transmit or receive. RX2 is receive only.
so you could do:
usrp->set_tx_antenna("TX/RX");
or
usrp->set_rx_antenna("TX/RX");
or
usrp->set_rx_antenna("RX2");
but NOT
usrp->set_tx_antenna("RX2");
Does that answer your question or do you need something more specific?
On Mon, May 13, 2013 at 10:27 PM, Medhat Hamdy <[email protected]>wrote:
>
> Hi all,
>
> I do not fully understand the connection between the connectors on the
> daughter boards and the RF connectors of the antennas. I am using USRP N210
> with SBX daughter board. I want to know which antenna is used for
> transmission and/or reception.
>
> Thanks
>
>
>
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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Message: 7
Date: Tue, 14 May 2013 20:20:48 +0800 (SGT)
From: ZaInzAiN Jj <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] QPSK Demodulator using GRC
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Dear all,
I get a block diagram of the QPSK demodulator from gnuradio.org like the
attachment. I get information from milist,
Frequency sync block can use FLL Band-Edge and Matched filter use Polyphase
Clock? Sync block in GRClike the attachment.
But when i run, there are error as below,
UHD Warning:
??? Unable to set the thread priority. Performance may be negatively affected.
??? Please see the general application notes in the manual for instructions.
??? EnvironmentError: OSError: error in pthread_setschedparam
What wrong with my QPSK demodulator blocks? whether the value of the
parameterFLL Band-Edge andPolyphase Clock? Sync block is correct? My be
there?suggestion for solved it?
I welcome any suggestions you.
Thanks,
Zai
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Message: 8
Date: Tue, 14 May 2013 21:05:49 +0800 (SGT)
From: ZaInzAiN Jj <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] OFDM implemetation, use python script or GRC?
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="us-ascii"
Dear all,
I want to implementation ofdm communication using two USRP N210 modules for
transmit image file. Should I use gnuradio python script or GRC? I am beginner
for gnuradio. I'd tried GRC, but some digital modulation and ofdm can not be
executed. I only can implement gmsk modulation for transmit image file using
two USRP. Do you experience the same? if no, my be I was wrong when implement
GRC block.
If i use python script, is there any suggestions what I should learn to
implement the OFDM communication for transmit image image file?
I welcome any suggestions you.
Thanks,
Zai
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Message: 9
Date: Tue, 14 May 2013 21:07:56 +0800 (SGT)
From: ZaInzAiN Jj <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] OFDM implementation, use python script or GRC?
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="us-ascii"
Dear all,
I want to implementation ofdm communication using two USRP N210 modules
for transmit image file. Should I use gnuradio python script or GRC? I
am beginner for gnuradio. I'd tried GRC, but some digital modulation and ofdm
can not be executed. I only can implement gmsk modulation for transmit image
file using two USRP. Do you experience the same? if no, my be I was wrong when
implement GRC block.
If i use python script, is there any suggestions what I should learn to
implement the OFDM communication for transmit image image file?
I welcome any suggestions you.
Thanks,
Zai
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Message: 10
Date: Tue, 14 May 2013 15:08:04 +0100
From: Robert Watson <[email protected]>
To: ZaInzAiN Jj <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] QPSK Demodulator using GRC
Message-ID:
<cap4wt-dvheqcgyqetjkmg19+1qbhznc2dcxmhsqn1lbeh-c...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
Check the note in the documentation on thread priority scheduling...
http://files.ettus.com/uhd_docs/manual/html/general.html#threading-notes
R.
On 14 May 2013 13:20, ZaInzAiN Jj <[email protected]> wrote:
> Dear all,
> I get a block diagram of the QPSK demodulator from gnuradio.org like the
> attachment. I get information from milist,
> Frequency sync block can use FLL Band-Edge and Matched filter use
> Polyphase Clock Sync block in GRC like the attachment.
>
> But when i run, there are error as below,
>
> UHD Warning:
> Unable to set the thread priority. Performance may be negatively
> affected.
> Please see the general application notes in the manual for
> instructions.
> EnvironmentError: OSError: error in pthread_setschedparam
>
> What wrong with my QPSK demodulator blocks? whether the value of the
> parameter FLL Band-Edge and Polyphase Clock Sync block is correct? My be
> there suggestion for solved it?
>
> I welcome any suggestions you.
> Thanks,
>
> Zai
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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------------------------------
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------------------------------
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