Re: [Discuss-gnuradio] FFT plot unit

[Marcus D. Leech]

On 08/03/2015 12:35 PM, John Ackermann N8UR wrote:
> It might be helpful to clarify that since this is a voltage ratio, 
> it's 20log rather than the 10log used for power (e.g., doubling 
> voltage is 6dB, doubling power is 3dB), so the scaling will look 
> different than a typical spectrum analyzer.  (It would be nice if the 
> instrumentation blocks could have an option to select voltage, or 
> power into 50 or 75 ohms...)
Yes, and we need 50 ohm and 75 ohm terminator blocks in GRC..... :) :)

But, seriously, one can always prefix any instrumentation block with a 
scaling function in the ax + b form with a multiplier and adder to 
achieve whatever
  pleasant-and-convenient scaling one wants.


> On 8/3/2015 12:27 PM, Marcus D. Leech wrote:
> > On 08/03/2015 12:24 PM, Martin Braun wrote:
> > > This pops up a lot, and hence earned a spot on the FAQ a while back:
> > >
> > > http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#How-do-I-know-the-exact-voltagepower-of-my-received-input-signal 
> > >
> > >
> > >
> > > ...although that section could surely be expanded.
> > >
> > > M
> > I just did so :)
>
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