[Discuss-gnuradio] --width-8 in usrp_fft.py causes spectral artifact when using --waterfall

[Marcus Leech]

I just upgraded to the latest tarballs, and happily noticed that 
usrp_fft.py now includes a waterfall display.

I also noticed the --width-8 option to use 8-bit, rather than 16-bit 
samples.  While width-8 seems to work
 in plain spectral display, it leaves a *strong* artifact in the 
waterfall display.  Perhaps the waterfall
 sink block hasn't been updated to handle 8-bit data?

Also, there used to be a parameter you could set to control spectral 
averaging in FFT display--
 something-mumble-alpha.  I can't find it anymore, and it would be 
really nice if I could
 turn on spectral averaging.

I finally got my USRP mounted in a permanent cabinet, with an internal 
power-supply.
 [The junkpile at work had a number of SCSI external disk drive boxes 
lying around
 from the late 1980s, so I grabbed one, since it had a power-supply and 
cooling fan].