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

[Matt Ettus]

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