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Today's Topics:
1. Max current USRP N210 GPIO? (Per Zetterberg)
2. Re: Max current USRP N210 GPIO? (Ian Buckley)
3. Re: Max current USRP N210 GPIO? (Marcus Leech)
4. Re: Max current USRP N210 GPIO? (Marcus Leech)
5. Re: Max current USRP N210 GPIO? (Ian Buckley)
6. Re: Tvrx2 impedance (Matt Ettus)
7. Re: Running Ubuntu/UHD from external USB 3 drive (Matt Ettus)
8. Re: B200 USB3 Help (Ettore)
9. Re: Max current USRP N210 GPIO? (Per Zetterberg)
10. useing the rx_samples_to_file app (iftah giladi)
11. Re: useing the rx_samples_to_file app (Marcus M?ller)
12. Re: Tvrx2 impedance (Marcus D. Leech)
----------------------------------------------------------------------
Message: 1
Date: Fri, 11 Apr 2014 16:21:35 +0000
From: Per Zetterberg <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] Max current USRP N210 GPIO?
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
Dear list,
What is the maximum current output from the GPIO (using basic daugtherboard) ?
BR/
Per
------------------------------
Message: 2
Date: Fri, 11 Apr 2014 09:35:27 -0700
From: Ian Buckley <[email protected]>
To: Per Zetterberg <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Max current USRP N210 GPIO?
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
Per,
For which USRP?
-Ian
On Apr 11, 2014, at 9:21 AM, Per Zetterberg <[email protected]> wrote:
>
> Dear list,
>
> What is the maximum current output from the GPIO (using basic daugtherboard) ?
>
> BR/
> Per
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
------------------------------
Message: 3
Date: Fri, 11 Apr 2014 16:39:06 +0000 (UTC)
From: Marcus Leech <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: [USRP-users] Max current USRP N210 GPIO?
Message-ID: <1115355810.207003.1397234346286.JavaMail.mail@webmail07>
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Message: 4
Date: Fri, 11 Apr 2014 16:41:21 +0000 (UTC)
From: Marcus Leech <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: [USRP-users] Max current USRP N210 GPIO?
Message-ID: <608285652.207041.1397234481805.JavaMail.mail@webmail07>
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Message: 5
Date: Fri, 11 Apr 2014 09:59:20 -0700
From: Ian Buckley <[email protected]>
To: Marcus Leech <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] Max current USRP N210 GPIO?
Message-ID: <[email protected]>
Content-Type: text/plain; charset="windows-1252"
Ah, getting blind in my old age?.12mA on those pins.
On Apr 11, 2014, at 9:41 AM, Marcus Leech <[email protected]> wrote:
> Ian:
>
> Per had mentioned N210 in the subject.
>
> I just looked at the Spartan 3 data sheet on I/Os, and it looks like "a few"
> LVTTL loads is all it will do.
>
>
> on Apr 11, 2014, Ian Buckley <[email protected]> wrote:
> Per,
> For which USRP?
> -Ian
>
> On Apr 11, 2014, at 9:21 AM, Per Zetterberg <[email protected]> wrote:
>
> >
> > Dear list,
> >
> > What is the maximum current output from the GPIO (using basic
> > daugtherboard) ?
> >
> > BR/
> > Per
> > _______________________________________________
> > 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: 6
Date: Fri, 11 Apr 2014 22:46:41 -0700
From: Matt Ettus <[email protected]>
To: Daniel Malafaia <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Tvrx2 impedance
Message-ID:
<CAN=1kn9ycyjct_jppo68hguzt-wdjjkc5h4taqfxklzc7p7...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
The chip is nominally 75 ohms, but you can treat it as 50 ohms. We did all
of our characterization in a 50 ohm system.
Matt
On Thu, Apr 10, 2014 at 1:01 AM, Daniel Malafaia <[email protected]>wrote:
> Does anyone knows if TVRX2 daugherboard has 50 or 75ohm impedance?
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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Message: 7
Date: Fri, 11 Apr 2014 23:49:59 -0700
From: Matt Ettus <[email protected]>
To: Robert Kossler <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Running Ubuntu/UHD from external USB 3 drive
Message-ID:
<CAN=1kn_x067rdu8s3txf4cxknugrvsskqxptfumy+vwsxny...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Robert,
If the hard drive and the B200 are on the same USB3 interface they will end
up sharing bandwidth. Depending on the data rates you want, this may be a
problem. Sharing for the boot drive is probably less of an issue, but
storing samples to disk is going to be harder. USB3 performance is highly
dependent on chipset, so it is hard to give you numbers without testing
your particular configuration.
Matt
On Tue, Apr 8, 2014 at 8:25 AM, Robert Kossler <[email protected]>wrote:
> I am considering installing Ubuntu Linux and the UHD driver on an External
> USB 3.0 drive (Buffalo Drive Station DDR) rather than installing on an
> internal drive. This would allow me to run the software from any PC
> (without needing to install a local copy of the OS/driver). This is in
> regard to using a B210 product.
>
>
>
> I know that the Ettus page includes a link for a LiveUSB SDR environment
> that could be downloaded and installed. I also know that GNU Radio has an
> GNURadioLiveDvd that is a bootable DVD.
>
>
>
> The purpose of this post is to find out if anyone has any tips / advice on
> this process.
>
> 1) My initial thought is that I would not use the LiveUSB download
> because the OS is 32 bit and the software might not be the latest. So, I
> planned to install Ubuntu 13.10 64 bit, the UHD driver, & GNU radio
> "manually".
>
> 2) I am wondering if anyone has experience running from an External
> USB 3.0 drive with regard to performance. Given that the USB 3.0 interface
> is 5Gb max speed, it seems that performance might be reasonably good if the
> drive itself has a pretty good USB 3 design.
>
> a. One application I plan to use is streaming raw RX data to hard
> drive. Since my destination for the raw data is my USB 3 hard drive, I
> know that I will be limited by the write speed of this interface. However,
> I'm wondering by installing the OS & software on this same USB 3 hard
> drive, I will limit my performance even more. In other words, would I be
> better off with the OS & software running from an internal SATA drive if
> the application is to stream B210 data from one USB3 interface to the USB 3
> hard drive on the 2nd USB 3 interface?
>
>
>
> Thanks.
>
> Rob
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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Message: 8
Date: Sat, 12 Apr 2014 08:01:48 +0000 (UTC)
From: Ettore <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] B200 USB3 Help
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
Brian Stanback <stanback@...> writes:
>
> The next card that I tried is working well for me (although I haven't
> benchmarked it to see what kind of performance it's capable of). The
> card is the Syba SD-PEX20122 which, oddly enough, also uses the Via
> VL800-Q8 chip, so the PCB implementations between Orico and the Syba
> must be different.
>
> Please let us know if you find something that works for you, whether
> it's the Syba or something else - hopefully this thread will help others
> avoid buying the wrong cards. :)
>
> -Brian
>
Hi Brian,
I'm waiting to receive my B200 and still googling to find a PCIe USB 3 card
works flawess. Do you made any progress on testing SD-PEX20122 at full USB3
speed? Thanks. Ettore
------------------------------
Message: 9
Date: Sat, 12 Apr 2014 09:31:32 +0000
From: Per Zetterberg <[email protected]>
To: Ian Buckley <[email protected]>, Marcus Leech
<[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Max current USRP N210 GPIO?
Message-ID: <[email protected]>
Content-Type: text/plain; charset="Windows-1252"
Thank you very much.
BR/
Per
________________________________________
From: Ian Buckley [[email protected]]
Sent: Friday, April 11, 2014 6:59 PM
To: Marcus Leech
Cc: Per Zetterberg; [email protected]
Subject: Re: [USRP-users] Max current USRP N210 GPIO?
Ah, getting blind in my old age?.12mA on those pins.
On Apr 11, 2014, at 9:41 AM, Marcus Leech
<[email protected]<mailto:[email protected]>> wrote:
Ian:
Per had mentioned N210 in the subject.
I just looked at the Spartan 3 data sheet on I/Os, and it looks like "a few"
LVTTL loads is all it will do.
on Apr 11, 2014, Ian Buckley
<[email protected]<mailto:[email protected]>> wrote:
Per,
For which USRP?
-Ian
On Apr 11, 2014, at 9:21 AM, Per Zetterberg <[email protected]<mailto:[email protected]>>
wrote:
>
> Dear list,
>
> What is the maximum current output from the GPIO (using basic daugtherboard) ?
>
> BR/
> Per
> _______________________________________________
> USRP-users mailing list
> [email protected]<mailto:[email protected]>
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
_______________________________________________
USRP-users mailing list
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http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
------------------------------
Message: 10
Date: Sat, 12 Apr 2014 16:31:05 +0300
From: "iftah giladi" <[email protected]>
To: <[email protected]>
Subject: [USRP-users] useing the rx_samples_to_file app
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
when using the rx_samples_to_file,
what is the format of the file created?
Is it in the VRT standard?
Are the samples interleaved I0Q0I1Q1. with no mata data at all?
Thank,
iftah
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Message: 11
Date: Sat, 12 Apr 2014 15:42:39 +0200
From: Marcus M?ller <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] useing the rx_samples_to_file app
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
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Hi Iftah,
although it is quite useful on its own, I would not call
rx_samples_to_file an "app", it is but an example, so don't hesitate
to look inside, and explore what the source code does [1].
You can specify the data type with the --type argument,
see rx_samples_to_file --help .
It defaults to short, that is uint16_t.
Yes, the samples are complex, thus the memory layout is
real,imag,real,imag,... (== IQIQ,... as you said)
These files can be read by GNU Radio's file source, numpy's/scipy's
fromfile[2], and even from octave/matlab (using "fread").
Greetings,
Marcus
[1]
https://github.com/EttusResearch/uhd/blob/master/host/examples/rx_samples_to_file.cpp#L123
[2]
http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#What-is-the-file-format-of-a-gr_file_sink-How-can-I-read-files-produced-by-a-file-sink
On 12.04.2014 15:31, iftah giladi wrote:
> when using the rx_samples_to_file,
>
> what is the format of the file created?
>
> Is it in the VRT standard?
>
> Are the samples interleaved I0Q0I1Q1. with no mata data at all?
>
>
>
> Thank,
>
> iftah
>
>
>
>
> _______________________________________________ USRP-users mailing
> list [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
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Message: 12
Date: Sat, 12 Apr 2014 11:06:18 -0400
From: "Marcus D. Leech" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Tvrx2 impedance
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 04/12/2014 01:46 AM, Matt Ettus wrote:
>
>
> The chip is nominally 75 ohms, but you can treat it as 50 ohms. We
> did all of our characterization in a 50 ohm system.
>
> Matt
>
The only time I'd be concerned about a mismatch-loss of 0.18dB (implied
by a 1.5:1 VSWR) is in front of a very-low-noise LNA between
the antenna the the LNA input. Otherwise, in most cases, in a
receive system, a 1.5:1 VSWR is considered excellent.
------------------------------
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