i3hev, mario held wrote:
Reg Edwards wrote:

If an amplifier incorporates a noise generator...
... then it is no longer just an amplifier. ....

... so, we must conclude that amplifiers do not exist!

of course, there is no real amplifying device which does not generate
noise; or, more precisely, there is no non-noisy real device at all

If you choose not to call "amplifier" a device which amplifies signals
if it has a non-unity noise figure, please feel free to do so - we live
in a (at least partially) free world... but you will be alone! )

Regards!

Don't be too hasty. Reg has verified he's got some coax that's much
lower loss than anyone else can buy (it actually meets the predictions
of his coax loss program), and has verified it by measuring it many
times. Maybe he also has a secret source of noise-free amplifiers. You
never know.

Roy Lewallen, W7EL