[Discuss-gnuradio] set_bandwidth on UHD called from osmosdr

[Marcus D. Leech]

The osmosdr source/sink blocks provide a "bandwidth" field,  which 
defaults to 0.  Previously on B2xx this field  would have no effect, 
because up
  until this point, the setting of the analog  bandwidth on B2xx did  
nothing.   Now it does.

It looks like trying to set  a bandwidth of 0 on B2xx clips to minimum 
bandwidth (about 1MHz or so, from the resulting spectrum). Not sure what
  the correct behavior here is.  Should  there be a magical numeric 
value (perhaps 0) that means "set it to some sensible default, given the
  sample-rate", should users of the osmocom source  blocks always just 
set the bandwidth field  to something like 0.8*sample-rate, and  then
   for hardware for which analog bandwidth is  settable it will do 
"something sensible"??

I don't know what the correct answer is, just  got  caught by this with 
one of my simple_ra users with a B200, and the very-latest UHD drivers.