On Mon, 7 Nov 2005 19:30:34 +0000, Prometheus
wrote:

In article , Don Pearce
writes
On Mon, 7 Nov 2005 15:41:48 -0000, "Jeff" wrote:


"
Should be relative to a microvolt into a 600 Ohm load.

Forget microVolt!
0 dBu is steady AF established at 775 milliVolts line level -- regardless
of load Z.

It is an easy mistake to make, because dB relative to a microvolt is often
written as dBu rather than
using the Greek letter 'mu'; a limitation of the ASCII character set!!

Jeff


dB relative to a microvolt is written as dBuV, so there need be no
confusion.

Rather as dB relative to one miliwatt should be written dBmW to avoid
people thinking it is miliampere. The unit should always be specified
where there is potential for confusion, although current practice can
omit it.

Far too late, I'm afraid. The dBm is far too well established.

d

Pearce Consulting
http://www.pearce.uk.com