Abbreviation for database management system.

Abbreviation. dB referenced to one millivolt across 75 ohms.
Note: This reference is not equivalent to dBm; it is, in fact,
1. 33 × 10-5 milliwatts.

Abbreviation. The power ratio, expressed in dB, between any point and a reference point selected as the zero relative transmission level point.
Note: Any power expressed in dBr does not specify the absolute power. It is a relative measurement only.

Abbreviation. dB above reference noise.
Note 1: Weighted noise power in dB is referred to
1. 0 picowatt. Thus, 0dBrn = -90 dBm. Use of 144-line, 144-receiver, or C-message weighting, or flat weighting, must be indicated in parentheses as required.
Note 2: With C-message weighting, a one-milliwatt, 1000-Hz tone will read +90 dBrn, but the same power as white noise,… (Read More →)

Synonym dBa.

Weighted noise power in dBrn, measured by a noise measuring set with 144-line weighting.

Flat noise power in dBrn, measured over the frequency band between frequencies f1 and f2.

Weighted noise power in dBrn, measured by a noise measuring set with C-message weighting.

Noise power in dBrnC referred to or measured at a zero transmission level point (0TLP).

Abbreviation for direct broadcast satellite. The technology of rebroadcasting digital signals, via geosynchronous communications satellites, directly to the consumer; DBS technology allows consumers situated over a relatively large footprint to receive broadcasts (which, for all practical purposes, are now always digitally encoded) by using a small-aperture dish antenna.