On 17/03/2014 15:45, Jeff wrote:


I also dispute that televisions are made to handle +20dBm; that is 100mW
far in excess of what a tv tuner can handle without overload!!!!

+20dbmV may be but not +20dbm.

Jeff

I know little about TV broadcasting, but in my (audio) field, 0 dBm is
taken as a level of 1 milliwatt into 600 ohms (0.775 V).

Funny how all these "standards" arise!

Incidentally, during the early development of 10cm radar kit, the "dB"
was banished from the lab. the chaps preferring to express their results
in linear units.

Les.