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Today's Topics:
1. Segmentation Fault (Core Dump) (Fagiri, Mazin)
2. Re: Segmentation Fault (Core Dump) (Marcus D. Leech)
3. Help Needed To Identify Signal (Mark McCarron)
4. Re: Help Needed To Identify Signal (Marcus D. Leech)
5. Re: Help Needed To Identify Signal (Mark McCarron)
6. Re: Help Needed To Identify Signal (Evan Merewether)
7. Re: Help Needed To Identify Signal (Marcus D. Leech)
8. Re: Help Needed To Identify Signal (Mark McCarron)
9. Re: Help Needed To Identify Signal (Mark McCarron)
10. Re: Help Needed To Identify Signal (Marcus D. Leech)
11. Re: Help Needed To Identify Signal (Mark McCarron)
12. Re: Help Needed To Identify Signal (Marcus D. Leech)
13. Re: Help Needed To Identify Signal (Mark McCarron)
14. Re: Help Needed To Identify Signal (Marcus D. Leech)
15. Re: Help Needed To Identify Signal (Mark McCarron)
16. Re: Help Needed To Identify Signal (Marcus D. Leech)
17. Re: Help Needed To Identify Signal (Mark McCarron)
18. Re: Help Needed To Identify Signal (Mark McCarron)
19. Re: Help Needed To Identify Signal (Stefano Speretta)
20. Transmitting a burst with one call to tx_streamer->send
(Sivan Toledo)
21. Re: Help Needed To Identify Signal (Mark McCarron)
22. Re: Transmitting a burst with one call to tx_streamer->send
(Mike Jameson)
----------------------------------------------------------------------
Message: 1
Date: Wed, 8 May 2013 15:58:57 -0500
From: "Fagiri, Mazin" <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] Segmentation Fault (Core Dump)
Message-ID:
<5e613b63f772974991f08e0c0be685ca4468062...@acdce7mb3.commscope.com>
Content-Type: text/plain; charset="us-ascii"
Dear all,
I'm to get some clarity on which version of USRP driver to run with GNU radio V
3.6.4.1. Basically I was getting a segmentation fault while trying to run the
basic GNU-Radio UHD commands such as uhd_rx_cfile, uhd_fft, etc after
installing GNU radio V 3.6.4.1 using fedora yum command for pre compiled
binary. Once I installed GNU radio, I verified the basic GNU radio UHD commands
can be executed even though no H/W was connected. Following that step, I
installed the USRP 210 H/W driver as specified on the ettus research website
below
Create the file /etc/yum.repos.d/ettus.repo. Copy this into the file:
[ettus-uhd-stable-repo]
name=Ettus Research - UHD Stable $releasever-$basearch
baseurl=http://files.ettus.com/binaries/uhd_stable/repo/uhd/fedora/$releasever/$basearch
gpgcheck=0
Run the following commands:
sudo yum --enablerepo='ettus-uhd-stable-repo' install uhd
Once the installation was successfully completed, I connected my USRP device
and ran some basic GNU radio commands, however I started getting segmentation
fault errors.
Below is a capture from the /var/log/messages
May 8 11:17:31 localhost kernel: [65279.600952] uhd_fft[10661]: segfault at
40518004 ip b4242c82 sp bf863e10 error 6 in _uhd_swig.s
o[b41c2000+ef000]
May 8 11:17:32 localhost abrt[10662]: Saved core dump of pid 10661
(/usr/bin/python2.7) to /var/spool/abrt/ccpp-2013-05-08-11:17:31
-10661 (25632768 bytes)
May 8 11:17:32 localhost abrtd: Directory 'ccpp-2013-05-08-11:17:31-10661'
creation detected
May 8 11:17:32 localhost abrtd: Generating backtrace
To get rid of the problem, I had to do the following
1) I had to disable the new UHD dependency by editing the file and set it to
enable=0
vi /etc/yum.repos.d/ettus.repo
[ettus-uhd-stable-repo]
name=Ettus Research - UHD Stable $releasever-$basearch
baseurl=http://files.ettus.com/binaries/uhd_stable/repo/uhd/fedora/$releasever/$basearch
gpgcheck=0
enabled=0
2) removed UHD which also removed GNU radio.
3) Re-installed GNU radio again using the yum command for a precompiled binary.
The default UHD driver is now as shown below
[root@localhost log]# rpm -qi uhd
Name : uhd
Version : 3.4.3
Release : 1.fc18
Architecture: i686
Install Date: Wed 08 May 2013 12:16:37 PM EDT
Group : Applications/Engineering
Size : 5259000
License : GPLv3+
Signature : RSA/SHA256, Wed 22 Aug 2012 10:04:09 AM EDT, Key ID
ff01125cde7f38bd
Source RPM : uhd-3.4.3-1.fc18.src.rpm
Build Date : Wed 22 Aug 2012 05:24:38 AM EDT
Build Host : buildvm-04.phx2.fedoraproject.org
Relocations : (not relocatable)
Packager : Fedora Project
Vendor : Fedora Project
URL : http://code.ettus.com/redmine/ettus/projects/uhd/wiki
Summary : Universal Hardware Driver for Ettus Research products
4) The GNU radio UHD command so far can execute without any segmentation fault
connected to a USRP N210 device.
5) My question is, does one need to update the USRP H/W driver? which version
of UHD is compatible with Fedora 18, GNU radio 3.6.4.1.
My host system specs are as follows
- Intel Core duo
- OS Fedore 18 - 32 bit
- GNU Radio 3.6.4.1 (installed using yum install gnuradio)
Device USRP N210.
Regards,
Mazin Fagiri
------------------------------
Message: 2
Date: Wed, 08 May 2013 18:45:24 -0400
From: "Marcus D. Leech" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Segmentation Fault (Core Dump)
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> Dear all,
> I'm to get some clarity on which version of USRP driver to run with GNU radio
> V 3.6.4.1. Basically I was getting a segmentation fault while trying to run
> the basic GNU-Radio UHD commands such as uhd_rx_cfile, uhd_fft, etc after
> installing GNU radio V 3.6.4.1 using fedora yum command for pre compiled
> binary. Once I installed GNU radio, I verified the basic GNU radio UHD
> commands can be executed even though no H/W was connected. Following that
> step, I installed the USRP 210 H/W driver as specified on the ettus research
> website below
>
> Create the file /etc/yum.repos.d/ettus.repo. Copy this into the file:
>
> [ettus-uhd-stable-repo]
> name=Ettus Research - UHD Stable $releasever-$basearch
> baseurl=http://files.ettus.com/binaries/uhd_stable/repo/uhd/fedora/$releasever/$basearch
> gpgcheck=0
>
I've already suggested build-gnuradio in another e-mail, but your basic
problem is that you have a "mixed" installation of Gnu Radio and UHD.
If you don't want to do the "install from source" thing, then:
Use "yum" to remove Gnu Radio and UHD, THEN follow the instructions here:
http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki/GNURadio_Linux
You should end up with mutually-compatible UHD + Gnu Radio.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
------------------------------
Message: 3
Date: Thu, 9 May 2013 00:07:13 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
I need some help identifying a signal that has been causing me some issues. It
can be seen here:
http://i.imgur.com/it92YVd.jpg
Looking for similar signals on the web, I keep coming back to a type of radar:
Possible candidates:
1. Doppler Radar
http://www.radartutorial.eu/18.explanations/ex54.en.html
2. Pulsed Radar
http://www.tmworld.com/design/characterization/4402377/How-to-test-modern-radars
Anyone got any other explanations?
Regards,
Mark McCarron
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Message: 4
Date: Wed, 08 May 2013 19:15:01 -0400
From: "Marcus D. Leech" <[email protected]>
To: Mark McCarron <[email protected]>,
"[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> I need some help identifying a signal that has been causing me some
> issues. It can be seen here:
>
> http://i.imgur.com/it92YVd.jpg
>
> Looking for similar signals on the web, I keep coming back to a type
> of radar:
>
> Possible candidates:
>
> 1. Doppler Radar
> http://www.radartutorial.eu/18.explanations/ex54.en.html
>
> 2. Pulsed Radar
> http://www.tmworld.com/design/characterization/4402377/How-to-test-modern-radars
>
> Anyone got any other explanations?
>
> Regards,
>
> Mark McCarron
Could be radar. Could be just that your front-end is overloaded, and
producing rich harmonics as a result of non-linear gain.
If the non-linearity is in the first gain stage, then backing-off the RF
gain won't help, since on the WBX (I think that's what you have), the
gain control sits between the first and 2nd stage LNAs. If it is in
the first stage, then you're likely dealing with a very strong signal that's
far outside the band you're currently looking at, driving the
front-end to distraction, so to speak.
Try putting 10-20dB of attenuation in front of your receiver. Does this
pattern go away completely, or is just reduced in magnitude?
One of the problems with "please tell me what this signal is" is that
it's really hard to say.
Imagine that someone forwards you a photo of a piece of skin from some
unknown long-dead, animal. Then they ask you "what animal is this from?".
The right answer would be "I don't have enough information to tell
you, and the commonly-found-dead-animals in my area are different than
yours".
They might be able to offer "Well, is isn't from an alligator."
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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------------------------------
Message: 5
Date: Thu, 9 May 2013 00:27:10 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Well, I pulled the antenna and the signal vanishes to e replaced with some
spurs.
http://i.imgur.com/N1BdVDt.jpg
Looking at the pic at the bottom of this page, the image in the last email does
look like a pulsed RF source:
http://www.microwaves101.com/encyclopedia/pulsedrfbreadboard.cfm
Regards,
Mark McCarron
Date: Wed, 8 May 2013 19:15:01 -0400
From: [email protected]
To: [email protected]; [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
I need some help identifying a signal that has been
causing me some issues. It can be seen here:
http://i.imgur.com/it92YVd.jpg
Looking for similar signals on the web, I keep coming back to a
type of radar:
Possible candidates:
1. Doppler Radar
http://www.radartutorial.eu/18.explanations/ex54.en.html
2. Pulsed Radar
http://www.tmworld.com/design/characterization/4402377/How-to-test-modern-radars
Anyone got any other explanations?
Regards,
Mark McCarron
Could be radar. Could be just that your front-end is overloaded,
and producing rich harmonics as a result of non-linear gain.
If the non-linearity is in the first gain stage, then backing-off
the RF gain won't help, since on the WBX (I think that's what you
have), the
gain control sits between the first and 2nd stage LNAs. If it is
in the first stage, then you're likely dealing with a very strong
signal that's
far outside the band you're currently looking at, driving the
front-end to distraction, so to speak.
Try putting 10-20dB of attenuation in front of your receiver. Does
this pattern go away completely, or is just reduced in magnitude?
One of the problems with "please tell me what this signal is" is
that it's really hard to say.
Imagine that someone forwards you a photo of a piece of skin from
some unknown long-dead, animal. Then they ask you "what animal is
this from?".
The right answer would be "I don't have enough information to tell
you, and the commonly-found-dead-animals in my area are different
than yours".
They might be able to offer "Well, is isn't from an alligator."
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 6
Date: Wed, 8 May 2013 18:41:39 -0600
From: "Evan Merewether" <[email protected]>
To: <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
I do not think this is radar. The high spike in the center indicates a high
duty cycle. Try looking at it in the time domain to confirm. It may be a
radar signal somewhere else which is saturating a normal spur. I have see
this type of reflex on other equipment.
Evan Merewether - 575-640-5582
_____
From: USRP-users [mailto:[email protected]] On Behalf Of
Mark McCarron
Sent: Wednesday, May 08, 2013 5:27 PM
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Well, I pulled the antenna and the signal vanishes to e replaced with some
spurs.
http://i.imgur.com/N1BdVDt.jpg
Looking at the pic at the bottom of this page, the image in the last email
does look like a pulsed RF source:
http://www.microwaves101.com/encyclopedia/pulsedrfbreadboard.cfm
Regards,
Mark McCarron
_____
Date: Wed, 8 May 2013 19:15:01 -0400
From: [email protected]
To: [email protected]; [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
I need some help identifying a signal that has been causing me some issues.
It can be seen here:
http://i.imgur.com/it92YVd.jpg
Looking for similar signals on the web, I keep coming back to a type of
radar:
Possible candidates:
1. Doppler Radar
http://www.radartutorial.eu/18.explanations/ex54.en.html
2. Pulsed Radar
http://www.tmworld.com/design/characterization/4402377/How-to-test-modern-ra
dars
Anyone got any other explanations?
Regards,
Mark McCarron
Could be radar. Could be just that your front-end is overloaded, and
producing rich harmonics as a result of non-linear gain.
If the non-linearity is in the first gain stage, then backing-off the RF
gain won't help, since on the WBX (I think that's what you have), the
gain control sits between the first and 2nd stage LNAs. If it is in the
first stage, then you're likely dealing with a very strong signal that's
far outside the band you're currently looking at, driving the front-end to
distraction, so to speak.
Try putting 10-20dB of attenuation in front of your receiver. Does this
pattern go away completely, or is just reduced in magnitude?
One of the problems with "please tell me what this signal is" is that it's
really hard to say.
Imagine that someone forwards you a photo of a piece of skin from some
unknown long-dead, animal. Then they ask you "what animal is this from?".
The right answer would be "I don't have enough information to tell you,
and the commonly-found-dead-animals in my area are different than yours".
They might be able to offer "Well, is isn't from an alligator."
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 7
Date: Wed, 08 May 2013 20:50:31 -0400
From: "Marcus D. Leech" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> Well, I pulled the antenna and the signal vanishes to e replaced with
> some spurs.
>
> http://i.imgur.com/N1BdVDt.jpg
>
> Looking at the pic at the bottom of this page, the image in the last
> email does look like a pulsed RF source:
>
> http://www.microwaves101.com/encyclopedia/pulsedrfbreadboard.cfm
>
>
> Regards,
>
> Mark McCarron
>
> ------------------------------------------------------------------------
> Date: Wed, 8 May 2013 19:15:01 -0400
> From: [email protected]
> To: [email protected]; [email protected]
> Subject: Re: [USRP-users] Help Needed To Identify Signal
>
> I need some help identifying a signal that has been causing me
> some issues. It can be seen here:
>
> http://i.imgur.com/it92YVd.jpg
>
> Looking for similar signals on the web, I keep coming back to a
> type of radar:
>
> Possible candidates:
>
> 1. Doppler Radar
> http://www.radartutorial.eu/18.explanations/ex54.en.html
>
> 2. Pulsed Radar
>
> http://www.tmworld.com/design/characterization/4402377/How-to-test-modern-radars
>
> Anyone got any other explanations?
>
> Regards,
>
> Mark McCarron
>
> Could be radar. Could be just that your front-end is overloaded, and
> producing rich harmonics as a result of non-linear gain.
>
> If the non-linearity is in the first gain stage, then backing-off the
> RF gain won't help, since on the WBX (I think that's what you have), the
> gain control sits between the first and 2nd stage LNAs. If it is in
> the first stage, then you're likely dealing with a very strong signal
> that's
> far outside the band you're currently looking at, driving the
> front-end to distraction, so to speak.
>
> Try putting 10-20dB of attenuation in front of your receiver. Does
> this pattern go away completely, or is just reduced in magnitude?
>
> One of the problems with "please tell me what this signal is" is that
> it's really hard to say.
>
> Imagine that someone forwards you a photo of a piece of skin from some
> unknown long-dead, animal. Then they ask you "what animal is this
> from?".
> The right answer would be "I don't have enough information to tell
> you, and the commonly-found-dead-animals in my area are different than
> yours".
> They might be able to offer "Well, is isn't from an alligator."
>
You may also be looking at switchmode power supply noise. Sometimes,
they're really really noise.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 8
Date: Thu, 9 May 2013 02:35:12 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Evan,
I took a source and piped the input into a scope. This is the output:
http://i.imgur.com/6rw4ixZ.jpg
There is a definite pulse there.
Regards,
Mark McCarron
From: [email protected]
To: [email protected]
Date: Wed, 8 May 2013 18:41:39 -0600
Subject: Re: [USRP-users] Help Needed To Identify Signal
I do not think this is radar. The high
spike in the center indicates a high duty cycle. Try looking at it in the time
domain to confirm. It may be a radar signal somewhere else which is saturating
a normal spur. I have see this type of reflex on other equipment.
Evan Merewether - 575-640-5582
From: USRP-users
[mailto:[email protected]] On
Behalf Of Mark McCarron
Sent: Wednesday, May 08, 2013 5:27
PM
To: [email protected]
Subject: Re: [USRP-users] Help
Needed To Identify Signal
Well, I pulled the antenna and the
signal vanishes to e replaced with some spurs.
http://i.imgur.com/N1BdVDt.jpg
Looking at the pic at the bottom of this page, the image in the last email does
look like a pulsed RF source:
http://www.microwaves101.com/encyclopedia/pulsedrfbreadboard.cfm
Regards,
Mark McCarron
Date: Wed, 8 May 2013 19:15:01 -0400
From: [email protected]
To: [email protected]; [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
I need some help identifying a signal that has been
causing me some issues. It can be seen here:
http://i.imgur.com/it92YVd.jpg
Looking for similar signals on the web, I keep coming back to a type of radar:
Possible candidates:
1. Doppler Radar
http://www.radartutorial.eu/18.explanations/ex54.en.html
2. Pulsed Radar
http://www.tmworld.com/design/characterization/4402377/How-to-test-modern-radars
Anyone got any other explanations?
Regards,
Mark McCarron
Could be radar. Could be
just that your front-end is overloaded, and producing rich harmonics as a
result of non-linear gain.
If the non-linearity is in the first gain stage, then backing-off the RF gain
won't help, since on the WBX (I think that's what you have), the
gain control sits between the first and 2nd stage LNAs. If it is
in the first stage, then you're likely dealing with a very strong signal that's
far outside the band you're currently looking at, driving the front-end
to distraction, so to speak.
Try putting 10-20dB of attenuation in front of your receiver. Does this
pattern go away completely, or is just reduced in magnitude?
One of the problems with "please tell me what this signal is" is that
it's really hard to say.
Imagine that someone forwards you a photo of a piece of skin from some unknown
long-dead, animal. Then they ask you "what animal is this
from?".
The right answer would be "I don't have enough information to tell
you, and the commonly-found-dead-animals in my area are different than
yours".
They might be able to offer "Well, is isn't from an
alligator."
-- Marcus LeechPrincipal InvestigatorShirleys Bay Radio Astronomy
Consortiumhttp://www.sbrac.org
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 9
Date: Thu, 9 May 2013 02:36:29 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Marcus,
I used a portable antenna and placed it next to every power supply and it had
no effect on the signal. The signal is rock steady regardless of where I am on
the property.
Regards,
Mark McCarron
Date: Wed, 8 May 2013 20:50:31 -0400
From: [email protected]
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Well, I pulled the antenna and the signal vanishes
to e replaced with some spurs.
http://i.imgur.com/N1BdVDt.jpg
Looking at the pic at the bottom of this page, the image in the
last email does look like a pulsed RF source:
http://www.microwaves101.com/encyclopedia/pulsedrfbreadboard.cfm
Regards,
Mark McCarron
Date: Wed, 8 May 2013 19:15:01 -0400
From: [email protected]
To: [email protected]; [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
I need some help identifying a signal that
has been causing me some issues. It can be seen here:
http://i.imgur.com/it92YVd.jpg
Looking for similar signals on the web, I keep coming back
to a type of radar:
Possible candidates:
1. Doppler Radar
http://www.radartutorial.eu/18.explanations/ex54.en.html
2. Pulsed Radar
http://www.tmworld.com/design/characterization/4402377/How-to-test-modern-radars
Anyone got any other explanations?
Regards,
Mark McCarron
Could be radar. Could be just that your front-end is
overloaded, and producing rich harmonics as a result of
non-linear gain.
If the non-linearity is in the first gain stage, then
backing-off the RF gain won't help, since on the WBX (I think
that's what you have), the
gain control sits between the first and 2nd stage LNAs. If
it is in the first stage, then you're likely dealing with a
very strong signal that's
far outside the band you're currently looking at, driving
the front-end to distraction, so to speak.
Try putting 10-20dB of attenuation in front of your receiver.
Does this pattern go away completely, or is just reduced in
magnitude?
One of the problems with "please tell me what this signal is"
is that it's really hard to say.
Imagine that someone forwards you a photo of a piece of skin
from some unknown long-dead, animal. Then they ask you "what
animal is this from?".
The right answer would be "I don't have enough information
to tell you, and the commonly-found-dead-animals in my area
are different than yours".
They might be able to offer "Well, is isn't from an
alligator."
You may also be looking at switchmode power supply noise.
Sometimes, they're really really noise.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 10
Date: Wed, 08 May 2013 21:39:58 -0400
From: "Marcus D. Leech" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> Marcus,
>
> I used a portable antenna and placed it next to every power supply and
> it had no effect on the signal. The signal is rock steady regardless
> of where I am on the property.
>
> Regards,
>
> Mark McCarron
>
Try a different computer?
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 11
Date: Thu, 9 May 2013 02:45:08 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Yes, last night. I powered down the entire house too. Phones, WIFI, power
supplies...everything. It was still there.
Regards,
Mark McCarron
Date: Wed, 8 May 2013 21:39:58 -0400
From: [email protected]
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Marcus,
I used a portable antenna and placed it next to every power
supply and it had no effect on the signal. The signal is rock
steady regardless of where I am on the property.
Regards,
Mark McCarron
Try a different computer?
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 12
Date: Wed, 08 May 2013 21:54:09 -0400
From: "Marcus D. Leech" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> Yes, last night. I powered down the entire house too. Phones, WIFI,
> power supplies...everything. It was still there.
>
> Regards,
>
> Mark McCarron
That's a bummer.
Unfortunately, being in the UK countryside isn't quite the level of
desolate isolation one can achieve over here in North America. What
with having
all of Europe within spitting distance 'n all :)
You might see if you can borrow a cavity filter from your local
ham-radio community, I think you were looking around 145Mhz in your plot
today,
which is in the amateur 2M band. I know that Sinclair used to make
this beautiful little multi-element 2M cavity filter that covered exactly
144-148Mhz. Very useful for knocking-down intermod problems in urban
settings, etc.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 13
Date: Thu, 9 May 2013 03:11:54 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
I have been doing some checking and I can't find any radar listed anywhere on
that frequency. I have checked the frequency allocations for the UK and
Ireland, but both list it for Fixed and Mobile Services as well as 2m ham.
I did find something in relation to the Graves radar in France on 143 MHz:
http://www.itr-datanet.com/~pe1itr/pdf/The%20143.050MHz%20Graves%20Radar%20a%20VHF%20Beacon.pdf
http://en.wikipedia.org/wiki/Graves_%28system%29
http://www.qsl.net/g0isw/g0iswms.htm
Its used for tracking satellites.
If its not this then someone is running an illegal radar.
Regards,
Mark McCarron
Date: Wed, 8 May 2013 21:54:09 -0400
From: [email protected]
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Yes, last night. I powered down the entire house
too. Phones, WIFI, power supplies...everything. It was still
there.
Regards,
Mark McCarron
That's a bummer.
Unfortunately, being in the UK countryside isn't quite the level of
desolate isolation one can achieve over here in North America. What
with having
all of Europe within spitting distance 'n all :)
You might see if you can borrow a cavity filter from your local
ham-radio community, I think you were looking around 145Mhz in your
plot today,
which is in the amateur 2M band. I know that Sinclair used to
make this beautiful little multi-element 2M cavity filter that
covered exactly
144-148Mhz. Very useful for knocking-down intermod problems in
urban settings, etc.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 14
Date: Wed, 08 May 2013 22:20:31 -0400
From: "Marcus D. Leech" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> I have been doing some checking and I can't find any radar listed
> anywhere on that frequency. I have checked the frequency allocations
> for the UK and Ireland, but both list it for Fixed and Mobile Services
> as well as 2m ham.
>
> I did find something in relation to the Graves radar in France on 143 MHz:
> http://www.itr-datanet.com/~pe1itr/pdf/The%20143.050MHz%20Graves%20Radar%20a%20VHF%20Beacon.pdf
>
> <http://www.itr-datanet.com/%7Epe1itr/pdf/The%2520143.050MHz%2520Graves%2520Radar%2520a%2520VHF%2520Beacon.pdf>
> http://en.wikipedia.org/wiki/Graves_%28system%29
> <http://en.wikipedia.org/wiki/Graves_%2528system%2529>
> http://www.qsl.net/g0isw/g0iswms.htm
>
> Its used for tracking satellites.
>
> If its not this then someone is running an illegal radar.
>
>
> Regards,
>
> Mark McCarron
If Graves caused the kind of problem you're seeing, the entire ham-radio
community in the UK would be boycotting French wine :-)
I'm unwilling to conclude that you're looking at a radar signal.
Seriously, there are *sooo* many ghoulies and ghosties in the RF
spectrum, it's
usually quite difficult to come to any conclusions other than "some
kind of RFI".
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 15
Date: Thu, 9 May 2013 03:30:41 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
True, that's why I find it weird, but you can't ignore the 1ms pulses in the
time domain:
http://i.imgur.com/Ydi4pvB.jpg
I found this trace of the signal funny because those pulses look identical to
action potentials:
http://hyperphysics.phy-astr.gsu.edu/hbase/biology/actpot.html
Regards,
Mark McCarron
Date: Wed, 8 May 2013 22:20:31 -0400
From: [email protected]
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
I have been doing some checking and I can't find
any radar listed anywhere on that frequency. I have checked the
frequency allocations for the UK and Ireland, but both list it
for Fixed and Mobile Services as well as 2m ham.
I did find something in relation to the Graves radar in France
on 143 MHz:
http://www.itr-datanet.com/~pe1itr/pdf/The%20143.050MHz%20Graves%20Radar%20a%20VHF%20Beacon.pdf
http://en.wikipedia.org/wiki/Graves_%28system%29
http://www.qsl.net/g0isw/g0iswms.htm
Its used for tracking satellites.
If its not this then someone is running an illegal radar.
Regards,
Mark McCarron
If Graves caused the kind of problem you're seeing, the entire
ham-radio community in the UK would be boycotting French wine :-)
I'm unwilling to conclude that you're looking at a radar signal.
Seriously, there are *sooo* many ghoulies and ghosties in the RF
spectrum, it's
usually quite difficult to come to any conclusions other than
"some kind of RFI".
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 16
Date: Wed, 08 May 2013 22:36:29 -0400
From: "Marcus D. Leech" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> True, that's why I find it weird, but you can't ignore the 1ms pulses
> in the time domain:
>
> http://i.imgur.com/Ydi4pvB.jpg
>
> I found this trace of the signal funny because those pulses look
> identical to action potentials:
>
> http://hyperphysics.phy-astr.gsu.edu/hbase/biology/actpot.html
>
>
> Regards,
>
> Mark McCarron
>
Ah, you didn't tell us you were living inside a giant squid....
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 17
Date: Thu, 9 May 2013 04:28:27 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
haha....I've been withholding information. :)
Giant squids are used as reference models because the neurons are so large.
The action potential is the same in humans.
http://humanbiologylab.pbworks.com/w/page/45302491/Resting%20Cellular%20Membrane%20Potential
But if that were an action potential train, then it would be auditory due to
the duration:
http://www2.le.ac.uk/departments/cpp/staff/professor-ian-forsythe-1/the-brainstem-auditory-pathway
10-100 microseconds is the average and that matches the RF signal.
Here, I have recorded the baseband and uploaded it.
http://depositfiles.com/files/br6068vx4
Regards,
Mark McCarron
Date: Wed, 8 May 2013 22:36:29 -0400
From: [email protected]
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
True, that's why I find it weird, but you can't
ignore the 1ms pulses in the time domain:
http://i.imgur.com/Ydi4pvB.jpg
I found this trace of the signal funny because those pulses look
identical to action potentials:
http://hyperphysics.phy-astr.gsu.edu/hbase/biology/actpot.html
Regards,
Mark McCarron
Ah, you didn't tell us you were living inside a giant squid....
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 18
Date: Thu, 9 May 2013 04:42:44 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Almost forgot, this is the GNURadio diagram that I was using. You will need to
replace the USRP Source with a file source and throttle.
http://i.imgur.com/ejXMMNv.jpg
The baseband file was recordedas a 16 bit PCM in SDR sharp, I haven't tried
importing it into GNURadio.
Regards,
Mark McCarron
From: [email protected]
To: [email protected]
Date: Thu, 9 May 2013 04:28:27 +0100
Subject: Re: [USRP-users] Help Needed To Identify Signal
haha....I've been withholding information. :)
Giant squids are used as reference models because the neurons are so large.
The action potential is the same in humans.
http://humanbiologylab.pbworks.com/w/page/45302491/Resting%20Cellular%20Membrane%20Potential
But if that were an action potential train, then it would be auditory due to
the duration:
http://www2.le.ac.uk/departments/cpp/staff/professor-ian-forsythe-1/the-brainstem-auditory-pathway
10-100 microseconds is the average and that matches the RF signal.
Here, I have recorded the baseband and uploaded it.
http://depositfiles.com/files/br6068vx4
Regards,
Mark McCarron
Date: Wed, 8 May 2013 22:36:29 -0400
From: [email protected]
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
True, that's why I find it weird, but you can't
ignore the 1ms pulses in the time domain:
http://i.imgur.com/Ydi4pvB.jpg
I found this trace of the signal funny because those pulses look
identical to action potentials:
http://hyperphysics.phy-astr.gsu.edu/hbase/biology/actpot.html
Regards,
Mark McCarron
Ah, you didn't tell us you were living inside a giant squid....
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 19
Date: Thu, 09 May 2013 09:55:26 +0200
From: Stefano Speretta <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
Have you tried to use a ferrite choke on the USB cable?
I noticed that some cables are a bit leaky and you may "see" the data
blocks being transferred on the bus..
Stefano
On 5/9/2013 05:42, Mark McCarron wrote:
> Almost forgot, this is the GNURadio diagram that I was using. You
> will need to replace the USRP Source with a file source and throttle.
>
> http://i.imgur.com/ejXMMNv.jpg
>
> The baseband file was recordedas a 16 bit PCM in SDR sharp, I haven't
> tried importing it into GNURadio.
>
> Regards,
>
> Mark McCarron
>
> ------------------------------------------------------------------------
> From: [email protected]
> To: [email protected]
> Date: Thu, 9 May 2013 04:28:27 +0100
> Subject: Re: [USRP-users] Help Needed To Identify Signal
>
> haha....I've been withholding information. :)
>
> Giant squids are used as reference models because the neurons are so
> large. The action potential is the same in humans.
>
> http://humanbiologylab.pbworks.com/w/page/45302491/Resting%20Cellular%20Membrane%20Potential
>
> <http://humanbiologylab.pbworks.com/w/page/45302491/Resting%2520Cellular%2520Membrane%2520Potential>
>
> But if that were an action potential train, then it would be auditory
> due to the duration:
>
> http://www2.le.ac.uk/departments/cpp/staff/professor-ian-forsythe-1/the-brainstem-auditory-pathway
>
> 10-100 microseconds is the average and that matches the RF signal.
>
> Here, I have recorded the baseband and uploaded it.
>
> http://depositfiles.com/files/br6068vx4
>
>
> Regards,
>
> Mark McCarron
>
> ------------------------------------------------------------------------
> Date: Wed, 8 May 2013 22:36:29 -0400
> From: [email protected]
> To: [email protected]
> Subject: Re: [USRP-users] Help Needed To Identify Signal
>
> True, that's why I find it weird, but you can't ignore the 1ms
> pulses in the time domain:
>
> http://i.imgur.com/Ydi4pvB.jpg
>
> I found this trace of the signal funny because those pulses look
> identical to action potentials:
>
> http://hyperphysics.phy-astr.gsu.edu/hbase/biology/actpot.html
>
>
> Regards,
>
> Mark McCarron
>
> Ah, you didn't tell us you were living inside a giant squid....
>
>
> --
> Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
>
> _______________________________________________ USRP-users mailing
> list [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
> _______________________________________________ USRP-users mailing
> list [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 20
Date: Thu, 9 May 2013 15:22:11 +0300
From: Sivan Toledo <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] Transmitting a burst with one call to
tx_streamer->send
Message-ID:
<CAOL_ruFpn1Tc_Hqzv=24qnb7x5uxwnqzscfse10p_kjbw6h...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
I am sending a packet with one call to uhd::tx_streamer, with an argument
that is a long packet (about 68k samples).
In the metadata argument I turn on both start_of_burst and end_of_burst.
However, the transmitter seems to stay on.
Is it okay to send a single packet this way, without fragmenting it in my
code? If so, why is the transmitter (an RFX400 in a USRP1) staying on?
Thanks, Sivan
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Message: 21
Date: Thu, 9 May 2013 13:37:18 +0100
From: Mark McCarron <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Help Needed To Identify Signal
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Stefano,
Marcus suggested that off-list and ferrite chokes were added to both the power
supply and USB cable. It made no difference.
The signal disappears when the antenna is removed, so it looks to be an
external signal and not internally generated. Its also not coming from my
equipment, as I have switched machines and poured down the entire house.
On another list, there was some suggestion that street lights may be the
source. But that was tested earlier and the signal remained rock steady as the
lights went out. I have compiled a light of local broadcasts compiled by
people with scanners in the local area. They have no record of anything like
this.
Regards,
Mark McCarron
Date: Thu, 9 May 2013 09:55:26 +0200
From: [email protected]
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
Have you tried to use a ferrite choke
on the USB cable?
I noticed that some cables are a bit leaky and you may "see" the
data blocks being transferred on the bus..
Stefano
On 5/9/2013 05:42, Mark McCarron wrote:
Almost forgot, this is the GNURadio diagram that I
was using. You will need to replace the USRP Source with a file
source and throttle.
http://i.imgur.com/ejXMMNv.jpg
The baseband file was recordedas a 16 bit PCM in SDR sharp, I
haven't tried importing it into GNURadio.
Regards,
Mark McCarron
From: [email protected]
To: [email protected]
Date: Thu, 9 May 2013 04:28:27 +0100
Subject: Re: [USRP-users] Help Needed To Identify Signal
haha....I've been withholding information. :)
Giant squids are used as reference models because the
neurons are so large. The action potential is the same in
humans.
http://humanbiologylab.pbworks.com/w/page/45302491/Resting%20Cellular%20Membrane%20Potential
But if that were an action potential train, then it would be
auditory due to the duration:
http://www2.le.ac.uk/departments/cpp/staff/professor-ian-forsythe-1/the-brainstem-auditory-pathway
10-100 microseconds is the average and that matches the RF
signal.
Here, I have recorded the baseband and uploaded it.
http://depositfiles.com/files/br6068vx4
Regards,
Mark McCarron
Date: Wed, 8 May 2013 22:36:29
-0400
From: [email protected]
To: [email protected]
Subject: Re: [USRP-users] Help Needed To Identify Signal
True, that's why I find it weird, but you
can't ignore the 1ms pulses in the time domain:
http://i.imgur.com/Ydi4pvB.jpg
I found this trace of the signal funny because those
pulses look identical to action potentials:
http://hyperphysics.phy-astr.gsu.edu/hbase/biology/actpot.html
Regards,
Mark McCarron
Ah, you didn't tell us you were living inside a giant
squid....
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 22
Date: Thu, 9 May 2013 14:48:12 +0100
From: Mike Jameson <[email protected]>
To: Sivan Toledo <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Transmitting a burst with one call to
tx_streamer->send
Message-ID:
<CAJcjmiQ03mFt+72fAACxmYvLBdfS8OUiAqU=xeprujrrqat...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi Sivan,
This sounds like local oscillator leakage. Use the following line in your
GRC UHD Sink for center frequency:
uhd.tune_request(uhd_center_freq,
rf_freq=(uhd_center_freq+uhd_lo_offset),rf_freq_policy=uhd.tune_request.POLICY_MANUAL)
The 'uhd_center_freq' and 'uhd_lo_offset' need to be specified. Set
'uhd_lo_offset' to be something like (samp_rate/2).
Mike
--
Mike Jameson M0MIK BSc MIET
Email: [email protected]
Web: http://scanoo.com
On 9 May 2013 13:22, Sivan Toledo <[email protected]> wrote:
> Hi,
>
> I am sending a packet with one call to uhd::tx_streamer, with an argument
> that is a long packet (about 68k samples).
>
> In the metadata argument I turn on both start_of_burst and end_of_burst.
> However, the transmitter seems to stay on.
>
> Is it okay to send a single packet this way, without fragmenting it in my
> code? If so, why is the transmitter (an RFX400 in a USRP1) staying on?
>
> Thanks, Sivan
>
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>
>
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