dBm
decibels relative to 1 milliwatt.
dBmV
decibels relative to 1 millivolt.
dBuV
decibels relative to 1 microvolt.
dBW
decibels relative to 1 watt.
DC
directional coupler.
dc, DC
direct current. An electric current flowing in one direction only and substantially constant in
value.
deviation
The peak difference between the instantaneous frequency of the modulated wave and the
carrier frequency, in an FM system.
differential gain
The difference in amplification of a signal (superimposed on a carrier) between two different
levels of carrier.
diplex filter
A filter which divides the frequency spectrum into a high frequency segment and a low
frequency segment so that two different signals can be sent down the same transmission path.
distribution
The activities associated with the movement of material, usually finished products or service
parts, from the manufacturer to the customer.
distribution system
The part of a CATV system consisting of the transmission medium (coaxial cables, fiber optic
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