In message , Chris Morriss
writes
OdBm ref 600 Ohm is 775mV rms, but 0dBm ref 50 Ohm is something like
120mV. That's why it's often easier to use dBV.

Agreed. And 0dDm ref 600 ohm (775mV) is dBu, if memory serves, so adding
to the confusion!

--
Regards,
Glenn Booth