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Today's Topics:
1. Re: USRP B210 (jason sam via USRP-users)
----------------------------------------------------------------------
Message: 1
Date: Tue, 27 May 2014 12:11:34 +0500
From: jason sam via USRP-users <[email protected]>
To: Marcus M?ller <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] USRP B210
Message-ID:
<caehlvxsbfxspv_3z7upad4+7ftqgmyzse5uf98rhs_2mbae...@mail.gmail.com>
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Thank you all.I appreciate the guidance.
On Mon, May 26, 2014 at 6:07 PM, Marcus M?ller <[email protected]>wrote:
> Hi Ali,
>
> I think you misunderstood Ian's reply. He explains in depth how the
> sampling rate mismatch happens. The U/O explanation is but a single
> sentence in the end, not related to the sampling rate explanation.
>
> Please try to thoroughly read our replies. If you have any problems
> understanding what we write, please don't hesitate to point us to that
> exact sentence and ask. Please don't skim our replies if you don't feel
> like you understood everything in the same detail we wrote it, because
> that means that you and us are wasting time.
>
> I write this because this is at least the fourth discussion with you
> where these kind of misunderstandings happen, and I really can't tell if
> it is a problem on our side.
>
> Greetings,
> Marcus
>
> On 26.05.2014 09:43, jason sam wrote:
> > Yes but he didn;t gave the reason for 'U' or 'O' appearing.
> >
> >
> > On Mon, May 26, 2014 at 11:56 AM, Marcus M?ller <
> [email protected]>wrote:
> >
> >> Well, Ian delivered a very nice explanation of your problem, then :)
> >>
> >> Greetings,
> >> Marcus
> >>
> >> On 26.05.2014 05:12, jason sam wrote:
> >>> Hi Marcus,
> >>> In the flowgraph i am TXing and i want a sample rate of 32MHz but it
> >> gives
> >>> the following warning:
> >>>
> >>> UHD Warning:
> >>> The hardware does not support the requested TX sample rate:
> >>> Target sample rate: 32.000000 MSps
> >>> Actual sample rate: 28.000000 MSps
> >>> UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
> >>>
> >>> You are right that when i used it for RXing,i get the over run 'O'.It's
> >> due
> >>> to sample rate or what?
> >>>
> >>>
> >>> On Sun, May 25, 2014 at 11:22 PM, Marcus M?ller <
> >> [email protected]>wrote:
> >>>> Hi Ian, Hi Ali,
> >>>>
> >>>> I'm totally confused:
> >>>> Ali, did you want a sampling rate of 28MHz or 32MHz in the first
> place?
> >>>> Because your flow graph doesn't even contain the number 28e6!
> >>>>
> >>>> Greetings,
> >>>> Marcus
> >>>>
> >>>> On 25.05.2014 20:06, Ian Buckley wrote:
> >>>>> OK, so here is what is happening. You set master_clock_rate to
> >>>> 56MHz?this is the actual sample clock of the data being transferred
> from
> >>>> the radio in to the FPGA.
> >>>>> Then in your application you are requesting that the B210 send data
> at
> >>>> sample rate 32MHz from USRP to Host over USB.
> >>>>> That would require the data to be resampled at a fractional ratio of
> >>>> 32/56 and that is something that the FPGA can not do, only fractions
> of
> >> the
> >>>> form 1/N where N = 1->512.
> >>>>> UHD is quantizing your sample rate request to the nearest sample rate
> >> it
> >>>> can achieve given your master_clock_rate request.
> >>>>> In this case simply set you master clock rate to 32MHz as well as
> your
> >>>> sample rate, filters in the radio will be set accordingly for 32MHz
> >> complex
> >>>> bandwidth.
> >>>>> The 'U' under run error is a TX only error, so I'm not sure how you
> are
> >>>> seeing that if you are using an RX only application.
> >>>>> -Ian
> >>>>>
> >>>>> On May 25, 2014, at 10:47 AM, jason sam via USRP-users <
> >>>> [email protected]> wrote:
> >>>>>> I change the master clock rate by 'set_master_clock_rate=56e6'.The
> >>>> error is:
> >>>>>> The hardware doesn't support the requested RX sample rate.
> >>>>>> Requested sample rate:32e6
> >>>>>> Actual sample rate:28e6
> >>>>>> There is also under run error and 'U' keeps on printing.The
> frequency
> >>>> is 2.4GHz.
> >>>>>> On 5/24/14, Marcus M?ller <[email protected]> wrote:
> >>>>>>> Hi Ali,
> >>>>>>>
> >>>>>>> this is indeed strange. How did you set your master clock rate?
> >>>>>>> Could you give us the whole error, including the actual frequency
> UHD
> >>>>>>> chose?
> >>>>>>>
> >>>>>>> Greetings,
> >>>>>>> Marcus
> >>>>>>>
> >>>>>>> On 24.05.2014 11:28, jason sam via USRP-users wrote:
> >>>>>>>> I am using B210...I have set the master clock rate to 56MHz..Now
> >> when
> >>>> i
> >>>>>>>> set
> >>>>>>>> the sample rate to 28MHz,i get UHD warning that the requested rate
> >> is
> >>>> not
> >>>>>>>> supported by the hardware.I am only using the USRP for RXing and
> in
> >>>> the
> >>>>>>>> specification sheet it is written that it can provide a bandwidth
> of
> >>>>>>>> 56MHz,then why this error is shown??
> >>>>>>>> Regards,
> >>>>>>>> Ali
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> _______________________________________________
> >>>>>>>> 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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