Re: [Openbts-discuss] UMTS Bad Waveform

[Tim B. <tbl...@ou...>]

I have verified that with the default band and UARFCN settings, the waveform looks correct.  However, changing the band and channel via devconfig results in incorrect waveform production.

Setting the band to 850 and the UARFCN to 5780 as in the screenshots must be done with the rawconfig command because the system returns that these are incorrect values however, they are not.  I suspect this has something to do with the band capabilities of the current release.  Are the 850 and 1900 bands within the capabilities of this release?  How would one go about configuring UARFCN 5780?

Thanks,
Tim

------------------------------

From: tbl...@ou...
To: to...@ts...
CC: ope...@li...
Subject: RE: [Openbts-discuss] UMTS Bad Waveform
Date: Thu, 12 Feb 2015 09:14:01 -0500




Hi Tom,

I have verified that I can transmit at the selected frequency (877mhz) and the power settings are good.  What log are you talking about?  

Tim

------------------------------

> Date: Tue, 10 Feb 2015 18:00:51 -0800
> Subject: Re: [Openbts-discuss] UMTS Bad Waveform
> From: to...@ts...
> To: tbl...@ou...
> CC: ope...@li...
> 
> On Tue, Feb 10, 2015 at 5:09 PM, Tim Blake <tbl...@ou...> wrote:
> > Here is a screenshot of the same signal with the improved SA settings.
> > Something is definitely wrong.
> >
> > https://onedrive.live.com/redir?resid=AF7BB757AB4CF78!215950&authkey=!AMb1EOdRyFndrlE&v=3&ithint=photo%2cjpg
> 
> That looks like an empty carrier. What is your downlink power setting?
> Anything noticeable in the log?
> 
> Try verifying that you can transmit at the target frequency. You can
> do that with the tx_waveforms utility. Adjust frequency and gain
> accordingly.
> 
> $ /usr/local/lib/uhd/examples/tx_waveforms --freq 1e9 --rate 6.25e6 --gain 20
> 
>   -TT