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

From: hanwen
Subject: Re: [Discuss-gnuradio] USRP2 scaling of short and float samples
Date: Wed, 23 Sep 2009 14:04:35 +0200

Thanks Matt.
And how does the FPGA scaling with set_tx_scale_iq() work?

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


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