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Today's Topics:
1. Re: N210 / WBX General Questions (Marcus D. Leech)
2. Re: win64 uhd showing wrong architecture (Josh Blum)
3. Re: N210 / WBX General Questions (Alexandru Csete)
4. Re: UHD Tx Issues with Spurious Samples Being Tx'ed (Josh Blum)
5. USRP2 times out and gives error ""Event code: 1" (Rashmi Shah)
6. Re: UHD Tx Issues with Spurious Samples Being Tx'ed (Isaac Gerg)
7. Re: UHD Tx Issues with Spurious Samples Being Tx'ed (Josh Blum)
8. Re: UHD Tx Issues with Spurious Samples Being Tx'ed (Isaac Gerg)
9. Re: N210 / WBX General Questions (Simon HB9DRV)
10. 4*4 MIMO receiver (Farrukh Aziz)
11. Re: 4*4 MIMO receiver (John Malsbury)
12. Re: USRP2 times out and gives error ""Event code: 1" (Josh Blum)
13. Re: 4*4 MIMO receiver (Nick Chan)
----------------------------------------------------------------------
Message: 1
Date: Wed, 02 May 2012 12:26:55 -0400
From: "Marcus D. Leech" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] N210 / WBX General Questions
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
On 02/05/12 11:34 AM, Simon HB9DRV wrote:
>
> Hi,
>
>
>
> Q1 -- 25 Ms/s -- excellent info.
>
> Q2 -- any info would be appreciated. I guess I'm wondering about MDS
> (sensitivity) and Dynamic range. The filters in the N210 would be
> interesting -- how good are they, for example one radio I have is
> quotes as 115+ dB 80% alias free.
>
>
>
> Obviously I'll see this for myself once I get the hardware, I'm just
> wonder what I can expect.
>
>
Neither the BASIC_RX nor the LFRX have any gain at all, so quoting MDS
is even less meaningful than usual.
I personally use the BASIC_RX with some gain/filtering up-front for
doing riometry at 38Mhz with a USRP2,
and it's easily sensitive down to -125dBm or so.
The ADC on the N210 has an SFDR of somewhere in the neighbourhood of
80dB, with saturation occurring
somewhere around +10dBm.
The N210 FPGA uses a multi-stage CIC decimator with one or two half-band
filters afterwards. The filtering
effect will depend somewhat on the decimation ratios. The out-of-band
attenuation I've found is usually on
the order of 90dB or better, but I'll let the designers chime in with
specific figures.
If you're using the BASIC_RX, it has no filtering at all, so you have to
do any analog anti-alias filtering
yourself, or filtering for the nyquist zone you wish to operate at.
The BASIC_RX has useful analog
performance up to about 250MHz, but the N210 ADC samples at 100MHz.
So you either low-pass to
50Mhz, or you bandpass to be within the Nyquist zone of interest.
--
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 2
Date: Wed, 02 May 2012 09:36:19 -0700
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] win64 uhd showing wrong architecture
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 05/02/2012 01:49 AM, Stefano Speretta wrote:
> Hello,
>
> I tried today the UHD version 3.4.1 (x64) and on my machine works fine
> (amd64), but when the library is loaded
> this string is printed:
>
> Win32; Microsoft Visual C++ version 10.0; Boost_104700;
> UHD_003.004.001-0-release
>
> while the architecture should have been Win64.
> I checked and the same library does not run under a 32-bit machine.
>
You are looking at the result of BOOST_PLATFORM macro. I think that
boost considers this a win32 platform regardless of compiler width.
I have noticed this with some of cmake's defines as well. I think its
just a proper nomenclature thing for windows x86* and friends.
-Josh
------------------------------
Message: 3
Date: Wed, 2 May 2012 19:06:29 +0200
From: Alexandru Csete <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] N210 / WBX General Questions
Message-ID:
<CAHG=S_fzFsjQybvUa9TUw8zgkNcZvV=wPw7=8rova6qo3pt...@mail.gmail.com>
Content-Type: text/plain; charset="windows-1252"
On Wed, May 2, 2012 at 5:34 PM, Simon HB9DRV <[email protected]> wrote:
> Hi,****
>
> ** **
>
> Q1 ? 25 Ms/s ? excellent info.****
>
> Q2 ? any info would be appreciated. I guess I?m wondering about MDS
> (sensitivity) and Dynamic range. The filters in the N210 would be
> interesting ? how good are they, for example one radio I have is quotes as
> 115+ dB 80% alias free.
>
I know this is just cargo cult science but you may find it useful.
Few years ago I measured the required signal level required to produce
decodable morse code using USRP1+LFRX and a simple SSB receiver implemented
in GNU Radio Companion:
Below 500 kHz: -97 dBm
1 MHz - 24 MHz: -100 dBm
24 MHz - 50 MHz: -97 dBm
In practice this means that if you have a decent antenna and live in an RF
quiet area, you will be able to hear a lot on the lower bands. On the
higher bands 20 dB of additional gain would be helpful (or an active
antenna like the one used by Dean).
Alex
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Message: 4
Date: Wed, 02 May 2012 10:33:14 -0700
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] UHD Tx Issues with Spurious Samples Being
Tx'ed
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 05/02/2012 05:30 AM, Isaac Gerg wrote:
> Hi Nick,
>
> I am using the LF RX/TX boards on a USRP1 with the UHD interface. I am
So USRP1 doesnt really support the timed samples or bursty samples
interface. Its really only on or off. There is some attempt to emulate
the timed behaviour. But its just not exact.
http://files.ettus.com/uhd_docs/manual/html/usrp1.html#missing-and-emulated-features
I think that explains your observations. You cant really use USRP1 in
this way.
-Josh
------------------------------
Message: 5
Date: Wed, 2 May 2012 13:35:21 -0400
From: Rashmi Shah <[email protected]>
To: [email protected]
Subject: [USRP-users] USRP2 times out and gives error ""Event code: 1"
Message-ID:
<CAAQik46_xSCigoeGR7na1h88h8=9LrXxO=w8ybfb9yu0fte...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi:
I am trying to benchmark USRP2 and USRP N200 (with DBSRX2) connected
together with MIMO cable. Each device is connected to the computer with
individual gigbit ethernet port.
Whenever I try and run the benchmark_rate, I get Timeout error i.e. "Error
code: 1" I have the latest version of firmware and fpga on both the
device. What can I do to fix this error?
Thanks,
-Rashmi
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Message: 6
Date: Wed, 2 May 2012 13:37:29 -0400
From: Isaac Gerg <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: [USRP-users] UHD Tx Issues with Spurious Samples Being
Tx'ed
Message-ID:
<cadnn3yxmfz2cpu-ckif2gp0glgdesckxx5nz6acfb83dpog...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi Josh,
I am not using the timed interface. I would just like to send a burst of
samples.
The functionality is possible with a USRP1. I was doing it last year with
a USRP1 before the old UHD interfaces went away. If you recall, I had this
same problem and you found a bug in the driver code where a flush was not
being done correctly. You patched it and then my application worked fine.
Since moving to the new UHD interface, I am getting the same behavior I
had last year before your patch.
Thanks,
Isaac
On Wed, May 2, 2012 at 1:33 PM, Josh Blum <[email protected]> wrote:
>
>
> On 05/02/2012 05:30 AM, Isaac Gerg wrote:
> > Hi Nick,
> >
> > I am using the LF RX/TX boards on a USRP1 with the UHD interface. I am
>
> So USRP1 doesnt really support the timed samples or bursty samples
> interface. Its really only on or off. There is some attempt to emulate
> the timed behaviour. But its just not exact.
>
>
> http://files.ettus.com/uhd_docs/manual/html/usrp1.html#missing-and-emulated-features
>
> I think that explains your observations. You cant really use USRP1 in
> this way.
>
> -Josh
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
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Message: 7
Date: Wed, 02 May 2012 11:03:03 -0700
From: Josh Blum <[email protected]>
To: Isaac Gerg <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] UHD Tx Issues with Spurious Samples Being
Tx'ed
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 05/02/2012 10:37 AM, Isaac Gerg wrote:
> Hi Josh,
>
> I am not using the timed interface. I would just like to send a burst of
> samples.
>
> The functionality is possible with a USRP1. I was doing it last year with
> a USRP1 before the old UHD interfaces went away. If you recall, I had this
> same problem and you found a bug in the driver code where a flush was not
> being done correctly. You patched it and then my application worked fine.
> Since moving to the new UHD interface, I am getting the same behavior I
> had last year before your patch.
>
Alright, flashbacks confirmed. The flushing code looks to be in there
and in-tact. Have to give it a closer look. -josh
> Thanks,
> Isaac
>
> On Wed, May 2, 2012 at 1:33 PM, Josh Blum <[email protected]> wrote:
>
>>
>>
>> On 05/02/2012 05:30 AM, Isaac Gerg wrote:
>>> Hi Nick,
>>>
>>> I am using the LF RX/TX boards on a USRP1 with the UHD interface. I am
>>
>> So USRP1 doesnt really support the timed samples or bursty samples
>> interface. Its really only on or off. There is some attempt to emulate
>> the timed behaviour. But its just not exact.
>>
>>
>> http://files.ettus.com/uhd_docs/manual/html/usrp1.html#missing-and-emulated-features
>>
>> I think that explains your observations. You cant really use USRP1 in
>> this way.
>>
>> -Josh
>>
>> _______________________________________________
>> USRP-users mailing list
>> [email protected]
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>
------------------------------
Message: 8
Date: Wed, 2 May 2012 14:39:29 -0400
From: Isaac Gerg <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: [USRP-users] UHD Tx Issues with Spurious Samples Being
Tx'ed
Message-ID:
<CADnN3yUUbmHjCTE7Y6kr_YeowbfdMnOQZZW5U29cNDYfxO=v...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Josh,
Hooked up the USRP1 to an o-scope. I see that sometimes, my 250 sample
burst goes through just fine. Other times, its jumbled in a way that looks
like the bursts are concatenated. Sometimes I see the
decaying exponential. It looks similar to this (ignore the units, just the
shape matches):
http://www.innovatia.com/Design_Center/DC_images/image761.gif
Thanks!
Isaac
On Wed, May 2, 2012 at 2:03 PM, Josh Blum <[email protected]> wrote:
>
>
> On 05/02/2012 10:37 AM, Isaac Gerg wrote:
> > Hi Josh,
> >
> > I am not using the timed interface. I would just like to send a burst of
> > samples.
> >
> > The functionality is possible with a USRP1. I was doing it last year
> with
> > a USRP1 before the old UHD interfaces went away. If you recall, I had
> this
> > same problem and you found a bug in the driver code where a flush was not
> > being done correctly. You patched it and then my application worked
> fine.
> > Since moving to the new UHD interface, I am getting the same behavior I
> > had last year before your patch.
> >
>
> Alright, flashbacks confirmed. The flushing code looks to be in there
> and in-tact. Have to give it a closer look. -josh
>
> > Thanks,
> > Isaac
> >
> > On Wed, May 2, 2012 at 1:33 PM, Josh Blum <[email protected]> wrote:
> >
> >>
> >>
> >> On 05/02/2012 05:30 AM, Isaac Gerg wrote:
> >>> Hi Nick,
> >>>
> >>> I am using the LF RX/TX boards on a USRP1 with the UHD interface. I am
> >>
> >> So USRP1 doesnt really support the timed samples or bursty samples
> >> interface. Its really only on or off. There is some attempt to emulate
> >> the timed behaviour. But its just not exact.
> >>
> >>
> >>
> http://files.ettus.com/uhd_docs/manual/html/usrp1.html#missing-and-emulated-features
> >>
> >> I think that explains your observations. You cant really use USRP1 in
> >> this way.
> >>
> >> -Josh
> >>
> >> _______________________________________________
> >> USRP-users mailing list
> >> [email protected]
> >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
> >>
> >
>
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Message: 9
Date: Wed, 2 May 2012 20:51:52 +0200
From: "Simon HB9DRV" <[email protected]>
To: <[email protected]>
Subject: Re: [USRP-users] N210 / WBX General Questions
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
Hi,
Thanks for this, also thanks to Marcus for his input.
Simon Brown, HB9DRV
<http://dit-dit-dit.com> http://dit-dit-dit.com
You are standing at the end of a road before a small brick building. Around
you is a forest.
A small stream flows out of the building and down a gully.
From: [email protected]
[mailto:[email protected]] On Behalf Of Alexandru Csete
Below 500 kHz: -97 dBm
1 MHz - 24 MHz: -100 dBm
24 MHz - 50 MHz: -97 dBm
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Message: 10
Date: Wed, 2 May 2012 21:28:20 -0700 (PDT)
From: Farrukh Aziz <[email protected]>
To: USRP user forum <[email protected]>
Subject: [USRP-users] 4*4 MIMO receiver
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="utf-8"
I am trying to make a receiver that has four independant RF front-ends that can
tune to the same frequency (like a MIMO receiver) and receive synchronized
samples. For this I tried to install two TVRX2 dbs on USRP N210, but that could
not be done, as TVRX2 is only recognized at one of the slots on the
mother-board. I am now trying to install each TVRX2 on a separate N210 and will
then connect them via MIMO cable. I intend to receive 4 synchronized, complex
data streams through this setup.
Am I doing it right? Any better ideas for doing this?
thanks
Farrukh Aziz Bhatti
PhD Candidate
Department of Electrical & Computer Engineering
University of Auckland
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Message: 11
Date: Wed, 02 May 2012 21:38:14 -0700
From: John Malsbury <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] 4*4 MIMO receiver
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Farrukh,
You can receive on both channels of the TVRX2 with an N200/N2100. Have
you followed the guidelines for setting the subdevice specification in
the USRP source? Show us the string you are using in this field.
http://files.ettus.com/uhd_docs/manual/html/dboards.html#tvrx2
-John
On 05/02/2012 09:28 PM, Farrukh Aziz wrote:
> I am trying to make a receiver that has four independant RF front-ends
> that can tune to the same frequency (like a MIMO receiver) and receive
> synchronized samples. For this I tried to install two TVRX2 dbs on
> USRP N210, but that could not be done, as TVRX2 is only recognized at
> one of the slots on the mother-board. I am now trying to install each
> TVRX2 on a separate N210 and will then connect them via MIMO cable. I
> intend to receive 4 synchronized, complex data streams through this setup.
> Am I doing it right? Any better ideas for doing this?
>
> thanks
>
> *Farrukh Aziz Bhatti*
> PhD Candidate
> Department of Electrical & Computer Engineering
> University of Auckland
>
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 12
Date: Thu, 03 May 2012 00:30:36 -0700
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] USRP2 times out and gives error ""Event
code: 1"
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 05/02/2012 10:35 AM, Rashmi Shah wrote:
> Hi:
>
> I am trying to benchmark USRP2 and USRP N200 (with DBSRX2) connected
> together with MIMO cable. Each device is connected to the computer with
> individual gigbit ethernet port.
>
> Whenever I try and run the benchmark_rate, I get Timeout error i.e. "Error
> code: 1" I have the latest version of firmware and fpga on both the
> device. What can I do to fix this error?
>
What options are you passing to benchmark_rate?
When you do a multi-channel receive, you need to synchronize the time.
There is a --mode=mimo option specifically for the MIMO cable.
-josh
------------------------------
Message: 13
Date: Thu, 03 May 2012 15:36:00 +0800
From: Nick Chan <[email protected]>
To: [email protected], hOWARD wONG <[email protected]>,
??? <[email protected]>
Subject: Re: [USRP-users] 4*4 MIMO receiver
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
? 2012/5/3 12:28, Farrukh Aziz ??:
> I am trying to make a receiver that has four independant RF front-ends
> that can tune to the same frequency (like a MIMO receiver) and receive
> synchronized samples. For this I tried to install two TVRX2 dbs on
> USRP N210, but that could not be done, as TVRX2 is only recognized at
> one of the slots on the mother-board. I am now trying to install each
> TVRX2 on a separate N210 and will then connect them via MIMO cable. I
> intend to receive 4 synchronized, complex data streams through this setup.
> Am I doing it right? Any better ideas for doing this?
>
> thanks
>
> *Farrukh Aziz Bhatti*
> PhD Candidate
> Department of Electrical & Computer Engineering
> University of Auckland
>
>
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
--
Best regards!
Yours Sincerely: Nick Chan
______________________________________________________
Engineers motto: cheap, good, fast: choose any two
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