Hello!
I noticed a problem with rtl_fm and r820t tuners. In few words, it doesn't
matter what value of gain you set with the -g parameter. The r820t tuner
will be always at its lower gain, this is deaf as a doorknob.
Otherwise, the same dongles works fine with GNU Radio or GQRX for example,
and gain can be set without problems.
rtl_fm gain works nicely on e4k tuners.
Someone else have noticed this?