My BTS has a min xmit power of -1dbm. I couldn't find specs on max rcv input power for
my particular device, but similar devices have specs in the -20 to -25dbm range. My test
set is adjustable from -104 to -25. No need to attenuate all the way to -60. But if you
can find specs for your receiver, it's better to use them than info from some guy on
the Internet.