Randy Yates wrote:
(Don Pearce) writes:
[...]
FFS. The dB is NOT a unit of anything. It is a ratio expressed in log
form for convenience (to avoid huge numbers). Nothing more and nothing
less.
"dB" is a ratio of powers.
.... into a fixed 600 ohm impedance, so they
have a mathematical dual in swings in voltage
(which is much more convenient to measure ).
http://www.digitalsignallabs.com/db.pdf
"dBm", "dBV", etc., are units.
They're still unitless. The specializations just let you know
some measure of detail about how many dimensions are represented
for cases like power vs. voltage...
--
Les Cargill