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Today's Topics:
1. start_of_burst for tx (Qifanski)
2. Replace USRP1 TCXO (Dan Zhao)
3. Re: start_of_burst for tx (Josh Blum)
4. How is gain distributed? (Sivan Toledo)
5. Re: How is gain distributed? (Josh Blum)
6. Re: How is gain distributed? (Sivan Toledo)
----------------------------------------------------------------------
Message: 1
Date: Sat, 9 Feb 2013 15:38:45 -0800
From: Qifanski <[email protected]>
To: [email protected]
Subject: [USRP-users] start_of_burst for tx
Message-ID:
<capvg14ym1q9k+p5xwo3o1b1ineqkrwy8d-a3d4i6hghfce9...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
How would USRP handle the transmit packets differently for different
start_of_burst flag (true/false)?
I'm trying to understand this to troubleshoot time alignment issue in
building a MIMO transmit matrix.
Thanks,
Qifan
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Message: 2
Date: Sat, 9 Feb 2013 22:12:03 -0500
From: Dan Zhao <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] Replace USRP1 TCXO
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
If I want replace USRP1 TCXO with another 32MHz 0.5ppm TCXO, do I need update
any UHD software or gnuradio software. Has anyone successful replaced TCXO? My
application need 0.5 up to 1ppm
Best Regards,
Dan
------------------------------
Message: 3
Date: Sat, 09 Feb 2013 21:29:29 -0600
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] start_of_burst for tx
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 02/09/2013 05:38 PM, Qifanski wrote:
> Hi,
>
> How would USRP handle the transmit packets differently for different
> start_of_burst flag (true/false)?
> I'm trying to understand this to troubleshoot time alignment issue in
> building a MIMO transmit matrix.
>
I think you will find this page helpful:
http://files.ettus.com/uhd_docs/manual/html/sync.html
-josh
> Thanks,
> Qifan
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
------------------------------
Message: 4
Date: Sun, 10 Feb 2013 08:32:27 +0200
From: Sivan Toledo <[email protected]>
To: [email protected]
Subject: [USRP-users] How is gain distributed?
Message-ID:
<caol_rufhuai1pgr-8qqjbsamz3awn-hkmhsr9mypc6m3f-u...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
My N200+WBX reports a gain range of 38dB, which consists of 31.5 in PGA0 (a
frontend programmable attenuator), 6 in ADC-digital, and 0.5 in ADC-fine.
When I set the gain to a given value, how does UHD distribute the total
gain between the gain elements? I could not find this in the sources (I
could not even find the strings "ADC-digital" and "ADC-fine" in the UHD
sources; perhaps they come from the FPGA image).
Thanks, Sivan
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Message: 5
Date: Sun, 10 Feb 2013 00:41:51 -0600
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] How is gain distributed?
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 02/10/2013 12:32 AM, Sivan Toledo wrote:
> My N200+WBX reports a gain range of 38dB, which consists of 31.5 in PGA0 (a
> frontend programmable attenuator), 6 in ADC-digital, and 0.5 in ADC-fine.
>
> When I set the gain to a given value, how does UHD distribute the total
> gain between the gain elements? I could not find this in the sources (I
> could not even find the strings "ADC-digital" and "ADC-fine" in the UHD
> sources; perhaps they come from the FPGA image).
> group
The magic is hiding inside of multi_usrp.cpp
So when setting the overall RX gain, the gain is first distributed to
the RF frontend, then to the ADC. For TX, the gain is first distributed
to the DAC, then to the RF frontend.
-josh
> Thanks, Sivan
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
------------------------------
Message: 6
Date: Sun, 10 Feb 2013 08:52:37 +0200
From: Sivan Toledo <[email protected]>
To: [email protected]
Cc: [email protected]
Subject: Re: [USRP-users] How is gain distributed?
Message-ID:
<caol_ruewhwzb01htlh2vdaudeqivqbfm3p3z_w2adbxos+i...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Great, thanks a lot. Sivan
On Sun, Feb 10, 2013 at 8:41 AM, Josh Blum <[email protected]> wrote:
>
>
> On 02/10/2013 12:32 AM, Sivan Toledo wrote:
> > My N200+WBX reports a gain range of 38dB, which consists of 31.5 in PGA0
> (a
> > frontend programmable attenuator), 6 in ADC-digital, and 0.5 in ADC-fine.
> >
> > When I set the gain to a given value, how does UHD distribute the total
> > gain between the gain elements? I could not find this in the sources (I
> > could not even find the strings "ADC-digital" and "ADC-fine" in the UHD
> > sources; perhaps they come from the FPGA image).
> > group
>
> The magic is hiding inside of multi_usrp.cpp
>
> So when setting the overall RX gain, the gain is first distributed to
> the RF frontend, then to the ADC. For TX, the gain is first distributed
> to the DAC, then to the RF frontend.
>
> -josh
>
> > Thanks, Sivan
> >
> >
> >
> > _______________________________________________
> > 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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