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Today's Topics:
1. Re: High CPU utilization (100%) when streaming twoconcurrent
channels regardless of sample rate (Josh Blum)
2. ADC and DAC of USRP (Nazmul Islam)
3. Re: [Discuss-gnuradio] ADC and DAC of USRP (Ian Buckley)
4. CORDIC rise time (Robert Palumbo)
5. Re: E110 upgrade failure ([email protected])
----------------------------------------------------------------------
Message: 1
Date: Fri, 05 Apr 2013 11:08:53 -0500
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] High CPU utilization (100%) when streaming
twoconcurrent channels regardless of sample rate
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 04/04/2013 08:22 AM, Pruitt, Paul N. wrote:
>
>
>> -----Original Message-----
>> From: USRP-users [mailto:[email protected]] On Behalf
>> Of Tom Hartley
>> Josh,
>>
>> This patch appeared within a few hours of the moment I upgraded my
>> prototype to 2-channels and encountered the same problem. The patch
>> solved the problem immediately for me as well. Is this is the last
> word
>> about it, or are you planning to fix it with condition variables or
> something
>> else?
>
> Tom,
>
> Josh made a branch
>
> https://github.com/EttusResearch/uhd/tree/quiet_reusable_barrier
>
> that contains another, condition variable-based, fix:
>
>
> https://github.com/EttusResearch/uhd/commit/ac43353e2dc76c22b92d5176eea7
> 31fe80070fbc
>
So, yes, I am planning to address the issue ASAP with condition
variables. Ive tested that branch thoroughly, but I would love to hear
any reports from the field (so to speak) :-)
I think in the future, we can use some of the streamer configuration
arguments to decide how many threads are thrown that the problem.
> I attempted a very quick test of that yesterday. My results were
> inconclusive, but I am not certain that I properly merged the changes
> into our baseline. I plan to re-test when I get some spare time.
>
> Josh: Thanks again for your support and responding so quickly with a
> fix!
>
thanks!
-josh
_________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
------------------------------
Message: 2
Date: Fri, 5 Apr 2013 14:15:15 -0400
From: Nazmul Islam <[email protected]>
To: GNURadio Discussion List <[email protected]>,
"[email protected]" <[email protected]>
Subject: [USRP-users] ADC and DAC of USRP
Message-ID:
<CAFtrfEbDJ8HSM3WYPu9g50+9JHWJYvzJeU=d-5mzvry3u_w...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I am investigating *the ADC/DAC power consumption vs. sampling rate* in
different software defined radio's. Where can I get the specific ADC and
DAC models that an USRP RF daughterboard (e.g. SBX) uses? If I know the
model, I assume that I can go to the manufacturer's website and find the
power consumption model.
In general, is the ADC/DAC power consumption of the present-day SDR's
comparable to the maximum transmit power (e.g. 100 mW in SBX)? If anyone
has looked at it before, please let me know.
Thanks for reading the email!
Nazmul
--
Muhammad Nazmul Islam
Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.
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Message: 3
Date: Fri, 5 Apr 2013 11:56:47 -0700
From: Ian Buckley <[email protected]>
To: Nazmul Islam <[email protected]>
Cc: "[email protected]" <[email protected]>,
GNURadio Discussion List <[email protected]>
Subject: Re: [USRP-users] [Discuss-gnuradio] ADC and DAC of USRP
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Current Ettus RF daughter cards work entirely with analog signals, DAC and ADC
are on the "Motherboard".
You can look at the published schematics for the model(s) you are interested to
extract the part numbers.
https://www.google.com/search?q=ettus+n210+schematic
As a general rule RF broadband converters working with sampling frequencies in
the hundreds of MHz consume power on the order of single digit Watts.
On Apr 5, 2013, at 11:15 AM, Nazmul Islam <[email protected]> wrote:
> Hello,
>
> I am investigating the ADC/DAC power consumption vs. sampling rate in
> different software defined radio's. Where can I get the specific ADC and DAC
> models that an USRP RF daughterboard (e.g. SBX) uses? If I know the model, I
> assume that I can go to the manufacturer's website and find the power
> consumption model.
>
> In general, is the ADC/DAC power consumption of the present-day SDR's
> comparable to the maximum transmit power (e.g. 100 mW in SBX)? If anyone has
> looked at it before, please let me know.
>
> Thanks for reading the email!
>
> Nazmul
>
> --
> Muhammad Nazmul Islam
>
> Graduate Student
> Electrical & Computer Engineering
> Wireless Information & Networking Laboratory
> Rutgers, USA.
> _______________________________________________
> Discuss-gnuradio mailing list
> [email protected]
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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Message: 4
Date: Sat, 6 Apr 2013 17:57:54 +1030
From: Robert Palumbo <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] CORDIC rise time
Message-ID: <3564926516755108364@unknownmsgid>
Content-Type: text/plain; charset="iso-8859-1"
Hi everyone,
Has anyone ever observed a rise time associated with samples through either
the CORDIC or digital FIR filters in the DDC chain of the USRP (
specifically the N210)? I know that the filters should have a rise time,
which can be accurately predicted in Matlab or in theory, but I was curious
if the CORDIC would have one as well.
I'm currently using the USRP in a pulsed mode operation, so I'm
continuously pulsing the DDC chain with samples.
Thanks, any help or advice is appreciated.
Rob
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Message: 5
Date: Sat, 6 Apr 2013 09:26:28 +0100
From: [email protected]
To: Philip Balister <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] E110 upgrade failure
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
Hi all, I also upgraded using opkg recently and experienced 'O' over run errors
when using an E100, likely related to kernel FPGA timing change. I since rolled
back to a stock e1xx-003 firmware and functionality is restored. All UHD
examples gave me the overrun issue.
On 3 Apr 2013, at 13:41, Philip Balister <[email protected]> wrote:
> On 04/03/2013 08:35 AM, Christopher Roussi wrote:
>> I just opened our E110 yesterday, and can confirm that doing the
>> upgrade is not a good thing. Of course, after reconstructing the SD
>> card, I did it again, just to make sure...this is time-consuming.
>> ;-{)}
>
> We tracked down the problem with the E110 (not E100) last night. We'll
> get the ipks updated ASAP.
>
> Philip
>
>>
>> Chris Roussi
>> Michigan Tech Research Inst.
>>
>> Sent from...well, you know.
>>
>> _______________________________________________
>> USRP-users mailing list
>> [email protected]
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
> _______________________________________________
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