Re: [Discuss-gnuradio] USRP2 scaling of short and float samples

[Eric Blossom]

On Wed, Sep 23, 2009 at 02:04:35PM +0200, hanwen wrote:
> Thanks Matt.
> And how does the FPGA scaling with set_tx_scale_iq() work?

Don't use it.  It's a bug that we expose it.
(It's a final scaling that the library may someday use.)

Eric


> 2009/9/22 Matt Ettus <address@hidden>
> 
> > hanwen wrote:
> >
> >> Hi GRers,
> >>
> >> What is the scaling of USRP2 TX/RX samples for float and short type? I
> >> noticed that the absolute values of received float complex samples of USRP2
> >> are below 1. I remeber in USRP the values are +/-several thousand at 
> >> maximum
> >> which match the resolution of ADC/DAC. But how are the samples of USRP2 are
> >> scaled?
> >> I also noticed that in gnuradio/usrp2/host/apps/tx_samples.cc there is a
> >> FPGA scaling using set_tx_scale_iq(). How does it work?
> >>
> >
> > In the USRP1 we use +/- 32767 as the floating point range.  In the USRP2 we
> > use +/- 1.0
> >
> > Matt
> >

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