Re: Stream args on UHD USRP Sink

[Marcus D. Leech]

On 12/03/2019 01:24 PM, Müller, Marcus (CEL) wrote:
> I'd recommend not overestimating the workload of scaling outside of UHD
> – UHD still has to do that multiplication! So, scaling e.g. your
> constellation or your pulse-shaping filter would make at least as much
> sense.
Indeed, if your flow-graph is within a single multiply block of running 
out of CPU headroom, you need to reevaluate what
  you're doing.


> On Tue, 2019-12-03 at 14:11 -0300, Wheberth Damascena Dias wrote:
> > Hi Marcus, I
> >
> > I am planning to give a try to the GnuRadio 3.8 PPA. We are developing some OOT 
> > blocks and some rework may be needed to do so.
> >
> > I will take a look at the code, but I am inclined to change my application to 
> > eliminate the need of scaling in real time (scalling the QAM symbols for 
> > example)
> >
> > Regarding the USRP I am using a pair of X310.
> >
> > Thank you very much.
> > Wheberth
> >
> >
> > Em ter, 3 de dez de 2019 13:26, Müller, Marcus (CEL) <address@hidden> escreveu:
> > > Uhhhh that's an ancient version of GNU Radio. Do you use any other UHD-
> > > linking software, or can you try our new PPA that would give you a
> > > modern GNU Radio 3.8.0.0?
> > >
> > > https://launchpad.net/~gnuradio/+archive/ubuntu/gnuradio-releases
> > >
> > > Anyway, for most USRPs "fullscale" actually should do some scaling (if
> > > you're so inclined, look for "_host_extra_scaling" in the UHD source
> > > code).
> > >
> > > What is the USRP you're using?
> > >
> > > Best regards,
> > > Marcus
> > >
> > > On Tue, 2019-12-03 at 08:41 -0300, Wheberth Damascena Dias wrote:
> > > > Hi all, not sure if I should send this here or at USRP list.
> > > >
> > > > I am trying to set the "fullscale" as a stream parameter of the USRP Sink 
> > > > block, but it have no effect. The idea is to avoid the use aof one block to scale the 
> > > > samples to [-1.0, +1.0] range May I be missing something?
> > > >
> > > > For reference I am using GnuRadio 3.7.11 with libuhd 3.10.3 (All stock from 
> > > > Ubuntu 18.04).
> > > > Thank you very
> > > >
> > > >
> > > >
> > > > --
> > > > Wheberth Damascena Dias
> > > > _______________ _____ _____ __ ___ __ _ _ _  _
> > > > http://www.linkedin.com/in/wheberth
> > > > e-mail:address@hidden