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Old 02-01-2007, 04:18 PM
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Default dBm and dBi - exterior antena questions

hey everybody

is dBm the same as dBi??

i have n other question i figured it out by my self

Last edited by ricmetal; 02-01-2007 at 04:32 PM..
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Old 02-12-2007, 07:36 AM
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of crouse defffernt
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Old 02-22-2007, 03:09 PM
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dBm is an abbreviation for the power ratio in decibel (d of the measured power referenced to one milliwatt (mW)

The antenna is compared to a mathematical ideal, the isotropic antenna. (Isotropic - equal in all directions). For an ideal isotropic antenna, radiation is distributed uniformly on the surface of a sphere of radius surrounding the antenna.

The gain is referenced to an isotropic antenna. If we compare power density, for the same transmit power and the same range dBi will be 10log10 received power of directional antenna / received power from isotropic antenna.
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