/**
\page  fft_scan_page Configure FFT Scan

\tableofcontents

<br>
\image html config-modem-scan.png "Scan Configuration Panel"
\image latex config-modem-scan.png "Scan Configuration Panel" width=5.5in
<br>

\# scans: The number of scans to perform (averaging).

db Range: The dynamic range in dB (vertical scale).

\section sFftScan FFT Scan

Analysis tool used to evaluate Rx/Codec signal path.  Can be used to measure
noise floor of the codec; view the transceiver passband characteristics,
Rx signal spectrum, etc.

<br>
\image html fcfhfacc.png "Scan results"
\image latex fcfhfacc.png "Scan results" width=5.5in
<br>

The scope shows the results, both final and during the scan averaging.
The # of scans specifies how many scans are averaged for the display.  The
dB range specifies the vertical scale as seen above.  "Use relative dB"
removes the vertical offset so that a wider range can be displayed with
more detail.

Left clicking any where on the waterfall restarts the scan.  You can
observe the effect on the scope display.  A comma separated file is
also generated; ~/.fldigi/fftscan.csv which can be opened with any
spread sheet program.

<br>
\ref fft_scan_page "Return to Top of Page"
<br>
\ref main_page "Return to Main Page"

*/