On 01 Aug 2014 17:48:22 GMT, Rob wrote:

Oh yes I do! dBm, meaning dB over a milliwatt.
And in the cable industry, dBuV, meaning dB over a microvolt.

Also dBmV for cable and OTA TV (into 75 ohms):
http://www.tselectronic.com/tech_notes/db.php

For FM tuners, it's dBf (dB over 1 femtowatt) usually into 300 ohms
but sometimes into 75 ohms:
http://mail.audiokarma.net/forums/showthread.php?t=29525
http://community.crutchfield.com/car_audio_and_video/f/27/receivers/t/3088/fm-sensitivity#13128

Plenty more to choose from:
http://en.wikipedia.org/wiki/Decibel#Suffixes_and_reference_values

In America, where everything is bigger, probably dB over a millivolt,
but not expressed as dBm!

Bigger is better. FCC broadcast EIRP specs are most often expressed
in dBW (dB over 1 watt) but sometimes dBk (dB over 1 kilowatt).

My own version for data sheets and press releases is dBr (dB better
than reality).


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Jeff Liebermann
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