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Re: [Discuss-gnuradio] window sizing issue

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] window sizing issue
Date: Fri, 16 Mar 2007 15:13:56 -0700
User-agent: Mutt/1.5.9i

On Fri, Mar 16, 2007 at 05:30:44PM -0400, address@hidden wrote:
> Thanks-
> I'm using the DC-30 MHz basic RX board.  So by recording the input signal, 
> recording the value displayed on my "time series" window, and knowing the 
> gain (0-20db if memory serves) I can calibrate the hardware so that I can 
> back out the original voltage levels at the input?  What impact does the 
> signal processing have on the absolute magnitudes?  If there is some 
> magnitude attenuation caused by the FIR filters, is it frequency 
> independent?
> thanks,
> eric

Not to discourage you, but the USRP was designed as a software radio
peripheral, not a precision calibrated measurement device.

You will have to calibrate _everything_ in the path, and of course
that includes the signal processing in the FPGA as well as anything in
the host-based signal processing path.  And yes, pretty much all of
this varies depending on a large variety of settings.  E.g., you'd
want to calibrate for each possible FPGA decimation rate that you're
interested in.

Also, any calibration you make is going to be temperature dependent.


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