|Subject:||Re: [Discuss-gnuradio] USRP2 scaling of short and float samples|
|Date:||Tue, 22 Sep 2009 10:09:30 -0700|
|User-agent:||Thunderbird 220.127.116.11 (X11/20090825)|
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
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