Quote Originally Posted by Jonathan View Post
Half is surely -3dB as log(3)=0.48.

Either way, no distances specified for these measurements so they don't really mean much without making assumptions. Plus the frequency response of the human ear isn't flat, so if one operates at a higher speed that would make a difference...
From my point i was talking dbm, as i thought everyone was but still it is right to clarify this, the difference with my workshop is i can hear 80dbm outside quite clearly, i can also hear 40dbm outside, but hardly.

Rick