On Sun, Aug 6, 2017 at 1:57 PM, John Ackermann N8UR <j...@febo.com> wrote:
> I also have a QT Frequency Sink as eye candy, and notice that its display > is about 6dB different than the Log Power FFT output. I can think of a > number of reasons why that could be, but my simple question is... is there > an appropriate way to adjust one or the other to align their readings? > (Later I'll send the log power results into a calibration routine to > convert to dBm based on measured results.) > > Also while I'm at it, there's a "Reference Scale" parameter in the Log > Power FFT, set by default to "2". Is there a way to use this parameter to > align the two readings? I tried changing it to "1" but that threw an error > at runtime. > I took a look at logpwrfft's code and the first thing that is done to that number is ref_scale/2, so you need to pass in a float (1.0) rather than an integer to not get it truncated to zero. Sounds like something to fix. > Also, there doesn't appear to be any window applied (or at least apparent) > in the Log Power FFT block. Is there a way to window the output? > The GRC definition for the block doesn't let you set it but there actually is a parameter win which defaults to Blackman-Harris.
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