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Today's Topics:
1. Re: Running the X300 off 12V Input (Matt Ettus via USRP-users)
2. Re: UHD code understanding questions (Ian Buckley via USRP-users)
3. Re: B200 Noise (Marcus D. Leech via USRP-users)
4. Configuring UHD options. (using the N210 USRP). Set
frequency, sample rate, and bandwidth. Where or how to manipulate
received data. (alejandro kilei via USRP-users)
5. Re: Configuring UHD options. (using the N210 USRP). Set
frequency, sample rate, and bandwidth. Where or how to manipulate
received data. (Marcus D. Leech via USRP-users)
6. asking about usrpN200 (Anak Galer via USRP-users)
7. Re: asking about usrpN200 (Mike Jameson via USRP-users)
8. Re: asking about usrpN200 (Marcus D. Leech via USRP-users)
9. Re: asking about usrpN200 (Anak Galer via USRP-users)
----------------------------------------------------------------------
Message: 1
Date: Thu, 29 May 2014 19:13:59 +0200
From: Matt Ettus via USRP-users <[email protected]>
To: Robert Palumbo <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Running the X300 off 12V Input
Message-ID:
<CAN=1kn8mcBsw1ASLk=2GBfgh1n+8qtt8eq4H+n=0xmmpvyu...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
You are safe to at least 15V, and we have overvoltage protection.
Matt
On Thu, May 29, 2014 at 3:02 PM, Robert Palumbo via USRP-users <
[email protected]> wrote:
> Hey all,
>
> I'm currently powering an X300 with 12V direct, rather than the power
> adapter, and it's working well (as expected).
>
> My legacy system I'm trying to use the X300 on currently runs off 13.2V.
> What's the range of input voltage that the X300 can safely run at? Will it
> work at 13V equally well?
>
> I took a look at the schematic of the X300, and it looks like all of the
> power supplies running off the 12V input rail would operate fine at 13V,
> but I was curious if there's anything specifically designed for 12V that
> wouldn't support any variation.
>
> Thanks,
>
> Rob
>
> --
> Robert A Palumbo
> [email protected]
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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Message: 2
Date: Thu, 29 May 2014 12:30:27 -0700
From: Ian Buckley via USRP-users <[email protected]>
To: Adrian Martinez Gomez <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] UHD code understanding questions
Message-ID: <[email protected]>
Content-Type: text/plain; charset="us-ascii"
Adrian,
Gain is distributed throughout the signal chain in a way that we have
determined to give the best performance form the radio. It is highly dependent
on which USRP and daughter board are used since they have such radically
different designs.
However in general, we do not apply user specified gain in the DSP, only
compensation gain that accounts for algorithmic gain of CIC and CORDIC
algorithms as we wish to always maximize the use of the potential dynamic range
in the DSP.
This is a good overview diagram for N210 though it could add still more detail
about the exact filters etc.
http://www.ni.com/white-paper/app/largeimage?lang=en&imageurl=%2Fcms%2Fimages%2Fdevzone%2Ftut%2FUSRP_Advanced_Diagram_smaller.png
The filter chain within the N210 DSP, starting at the CORDIC and ending at the
VITA framing logic is: 4 stage CIC filter, 7 tap half band filter, 31tap half
band filter.
-Ian
On May 28, 2014, at 3:02 AM, Adrian Martinez Gomez via USRP-users
<[email protected]> wrote:
> Dear USRP users,
>
> I have a question regarding the structure of the code for the N210, which I
> hope can be answered by someone from Ettus.
>
> 1) When setting usrp->set_rx_gain() to a gain, I know that uhd_usrp_probe
> will give me the gain range I can set in that variable. I have read the
> function set_rx_gain in the multi_usrp.cpp file, but it's still not clear
> what's done there.
> My question is, what gain am I setting there specifically? Is it a gain in
> the FPGA code that affects the ddc_chain module? If yes, where?
>
> I have only been using the example rx_samples_to_file, and I would like to
> know the meaning of that gain every time I use it.
>
> 2) I read and did a hand-drawn schematic of the DDC chain (ddc_chain.v file),
> and DUC (duc_chain.v), and altough I am new to Verilog I grasped the main
> ideas there.
> However, is there a documentation I have missed explaining the DSP in the
> USRPs FPGA? I found this one [1] for the USRP2, but it would be nice to have
> something updated for the N210.
> It would be nice to know what filters are used, what every module does, etc
> without having to dive into the Verilog (which again, is sometimes very hard
> to understand for someone new to the language).
>
> Regards,
> Adrian.
>
> [1] http://gnuradio.org/redmine/projects/gnuradio/wiki/UsrpFAQIntroFPGA
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 3
Date: Thu, 29 May 2014 17:27:02 -0400
From: "Marcus D. Leech via USRP-users" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] B200 Noise
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
On 05/29/2014 11:16 AM, Daniel Malafaia via USRP-users wrote:
> Dear USRP users,
>
> I'm having a lot of noise problems in the B200, they only appear
> when there's a antenna connected even if it's connected to the input
> I'm not using.
> I'm working with UHD 003.007.001.
>
> Best Regards,
> Adrian.
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
The inputs on the AD9361 are very low noise, so even at modest gain
levels, and signal you introduce from the outside world, even if on the
wrong
antenna port (and thus attenuated by quite a bit) will be visible on
an FFT.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 4
Date: Thu, 29 May 2014 15:54:00 -0600
From: alejandro kilei via USRP-users <[email protected]>
To: [email protected]
Subject: [USRP-users] Configuring UHD options. (using the N210 USRP).
Set frequency, sample rate, and bandwidth. Where or how to manipulate
received data.
Message-ID:
<CAN6OAx3BnzX5ecVL==or1fkZHa=hjbqyi1lnsjxhrk7w4t7...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
I'm using an embedded Linux on ZyBo board called Xillinux.
I have been reading through tutorials and the examples for a few days, but
I would like to know how I can set the center frequency, sample rate, and
bandwidth? Also, Where does the received data get stored or how can I
manipulate it through Linux? (I am not using GNU radio, just UHD. GNU radio
has too much overhead for the signal processing project I am working on).
Thanks for the help in advance. This forum has been really helpful in
finding common issues, work arounds, and getting help from others.
Alejandro
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Message: 5
Date: Thu, 29 May 2014 17:58:40 -0400
From: "Marcus D. Leech via USRP-users" <[email protected]>
To: alejandro kilei <[email protected]>,
"[email protected]" <[email protected]>
Subject: Re: [USRP-users] Configuring UHD options. (using the N210
USRP). Set frequency, sample rate, and bandwidth. Where or how to
manipulate received data.
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
On 05/29/2014 05:54 PM, alejandro kilei via USRP-users wrote:
> I'm using an embedded Linux on ZyBo board called Xillinux.
> I have been reading through tutorials and the examples for a few days,
> but I would like to know how I can set the center frequency, sample
> rate, and bandwidth? Also, Where does the received data get stored or
> how can I manipulate it through Linux? (I am not using GNU radio, just
> UHD. GNU radio has too much overhead for the signal processing project
> I am working on).
>
> Thanks for the help in advance. This forum has been really helpful in
> finding common issues, work arounds, and getting help from others.
> Alejandro
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
Look at the examples that come with UHD, and the Doxygen docs for the
API are here:
http://files.ettus.com/uhd_docs/doxygen/html/index.html
Examples:
https://github.com/EttusResearch/uhd/tree/master/host/examples
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 6
Date: Fri, 30 May 2014 22:03:44 +0700
From: Anak Galer via USRP-users <[email protected]>
To: usrp-users <[email protected]>
Subject: [USRP-users] asking about usrpN200
Message-ID:
<CAO_+gxKrAJHULb2y28=shirg+n9k5kqp5crmap85eamwrjs...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hallo
I want to ask about USRPn200 & SBX board, I tried to run the GSM
modulation using OpenBTS
but I am confused with the SA results I get. in my OpenBTS configuration
i'm using ARFCN 1 (down 935.2, up 890.2)
the question is
1. why USRP generate frequency 933Mhz not 935.2 Mhz?
2. Why the USRP issued 2 transmitter and look like horns?
picture in attach
Regards
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Message: 7
Date: Fri, 30 May 2014 16:13:39 +0100
From: Mike Jameson via USRP-users <[email protected]>
To: Anak Galer <[email protected]>
Cc: usrp-users <[email protected]>
Subject: Re: [USRP-users] asking about usrpN200
Message-ID:
<CAJcjmiS4z=kxn80d3snb0tzyr8kcsjgqgbubwaas6jpxu5b...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Two things to try:
1) Use a GPS locked 10MHz reference in the front of the N200 to rule out
the frequency shift being caused by internal clock instability.
2) Lower the TX power as you could be pushing the WBX's PA into non-linear
regions.
Mike
--
Mike Jameson M0MIK BSc MIET
Ettus Research Technical Support
Email: [email protected]
Web: http://ettus.com
On Fri, May 30, 2014 at 4:03 PM, Anak Galer via USRP-users <
[email protected]> wrote:
> Hallo
>
> I want to ask about USRPn200 & SBX board, I tried to run the GSM
> modulation using OpenBTS
> but I am confused with the SA results I get. in my OpenBTS configuration
> i'm using ARFCN 1 (down 935.2, up 890.2)
> the question is
> 1. why USRP generate frequency 933Mhz not 935.2 Mhz?
> 2. Why the USRP issued 2 transmitter and look like horns?
>
> picture in attach
>
> Regards
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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Message: 8
Date: Fri, 30 May 2014 11:19:14 -0400
From: "Marcus D. Leech via USRP-users" <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] asking about usrpN200
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
On 05/30/2014 11:13 AM, Mike Jameson via USRP-users wrote:
> Two things to try:
>
> 1) Use a GPS locked 10MHz reference in the front of the N200 to rule
> out the frequency shift being caused by internal clock instability.
> 2) Lower the TX power as you could be pushing the WBX's PA into
> non-linear regions.
>
> Mike
>
> --
> Mike Jameson M0MIK BSc MIET
> Ettus Research Technical Support
> Email: [email protected] <mailto:[email protected]>
> Web: http://ettus.com
>
>
> On Fri, May 30, 2014 at 4:03 PM, Anak Galer via USRP-users
> <[email protected] <mailto:[email protected]>> wrote:
>
> Hallo
>
> I want to ask about USRPn200 & SBX board, I tried to run the GSM
> modulation using OpenBTS
> but I am confused with the SA results I get. in my OpenBTS
> configuration i'm using ARFCN 1 (down 935.2, up 890.2)
> the question is
> 1. why USRP generate frequency 933Mhz not 935.2 Mhz?
> 2. Why the USRP issued 2 transmitter and look like horns?
>
> picture in attach
>
> Regards
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected] <mailto:[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
Good suggestions.
But a general comment is that "Optimize my OpenBTS installation" type
questions really belong on the OpenBTS support forums, not here.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Message: 9
Date: Fri, 30 May 2014 22:47:49 +0700
From: Anak Galer via USRP-users <[email protected]>
To: "Marcus D. Leech" <[email protected]>
Cc: usrp-users <[email protected]>
Subject: Re: [USRP-users] asking about usrpN200
Message-ID:
<CAO_+gxJ=MgERfK0_6PLHzRjhw9CQhNHeF9R5v=yDOT4BY=x...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
@mike Thanks I'll try your option
@marcus I just ask, it's problems occur due to hardware or software.
coincidence only there is OpenBTS installed on notebook.
maybe I will try another modulation next time. but thanks for your reply
Regards
------------------------------
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