GAINS in power: +3 dB = twice, +6 dB = four times (2x2), +9 dB = eight times (2x2x2), +10 dB = ten times, +20 dB = one hundred times (10x10), +30 dB = one thousand times (10x10x10). LOSSES: -3 dB = half, -6 dB = one quarter (0.5 x 0.5), -9 dB = one eighth (0.5 x 0.5 x 0.5), -10 dB = one tenth, -20 dB = one hundredth (0.1 x 0.1), -30 dB = one thousandth (0.1 x 0.1 x 0.1).
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
GAINS in power: +3 dB = twice, +6 dB = four times (2x2), +9 dB = eight times (2x2x2), +10 dB = ten times, +20 dB = one hundred times (10x10), +30 dB = one thousand times (10x10x10). LOSSES: -3 dB = half, -6 dB = one quarter (0.5 x 0.5), -9 dB = one eighth (0.5 x 0.5 x 0.5), -10 dB = one tenth, -20 dB = one hundredth (0.1 x 0.1), -30 dB = one thousandth (0.1 x 0.1 x 0.1).
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
GAINS in power: +3 dB = twice, +6 dB = four times (2x2), +9 dB = eight times (2x2x2), +10 dB = ten times, +20 dB = one hundred times (10x10), +30 dB = one thousand times (10x10x10). LOSSES: -3 dB = half, -6 dB = one quarter (0.5 x 0.5), -9 dB = one eighth (0.5 x 0.5 x 0.5), -10 dB = one tenth, -20 dB = one hundredth (0.1 x 0.1), -30 dB = one thousandth (0.1 x 0.1 x 0.1).
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
A reduction at the transmitting station from 1500 watts to 150 watts is a drop of -10 dB (one tenth). The received signal strength which read '10 dB OVER Nine S units' will drop -10 dB to simply 'Nine S units'.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
A reduction at the transmitting station from 1500 watts to 150 watts is a drop of -10 dB (one tenth). The received signal strength which reads '20 dB OVER Nine S units' will drop -10 dB to simply '10 dB over Nine S units'.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
The DECIBEL: "A unit used in the COMPARISON of two power levels relating to electrical signals". GAINS in power: +3 dB = twice, +6 dB = four times (2x2), +9 dB = eight times (2x2x2), +10 dB = ten times, +20 dB = one hundred times (10x10), +30 dB = one thousand times (10x10x10). LOSSES: -3 dB = half, -6 dB = one quarter (0.5 x 0.5), -9 dB = one eighth (0.5 x 0.5 x 0.5), -10 dB = one tenth, -20 dB = one hundredth (0.1 x 0.1), -30 dB = one thousandth (0.1 x 0.1 x 0.1).
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
GAINS in power: +3 dB = twice, +6 dB = four times (2x2), +9 dB = eight times (2x2x2), +10 dB = ten times, +20 dB = one hundred times (10x10), +30 dB = one thousand times (10x10x10). LOSSES: -3 dB = half, -6 dB = one quarter (0.5 x 0.5), -9 dB = one eighth (0.5 x 0.5 x 0.5), -10 dB = one tenth, -20 dB = one hundredth (0.1 x 0.1), -30 dB = one thousandth (0.1 x 0.1 x 0.1).
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
GAINS in power: +3 dB = twice, +6 dB = four times (2x2), +9 dB = eight times (2x2x2), +10 dB = ten times, +20 dB = one hundred times (10x10), +30 dB = one thousand times (10x10x10). LOSSES: -3 dB = half, -6 dB = one quarter (0.5 x 0.5), -9 dB = one eighth (0.5 x 0.5 x 0.5), -10 dB = one tenth, -20 dB = one hundredth (0.1 x 0.1), -30 dB = one thousandth (0.1 x 0.1 x 0.1).
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
GAINS in power: +3 dB = twice, +6 dB = four times (2x2), +9 dB = eight times (2x2x2), +10 dB = ten times, +20 dB = one hundred times (10x10), +30 dB = one thousand times (10x10x10). LOSSES: -3 dB = half, -6 dB = one quarter (0.5 x 0.5), -9 dB = one eighth (0.5 x 0.5 x 0.5), -10 dB = one tenth, -20 dB = one hundredth (0.1 x 0.1), -30 dB = one thousandth (0.1 x 0.1 x 0.1).
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
GAINS in power: +3 dB = twice, +6 dB = four times (2x2), +9 dB = eight times (2x2x2), +10 dB = ten times, +20 dB = one hundred times (10x10), +30 dB = one thousand times (10x10x10). LOSSES: -3 dB = half, -6 dB = one quarter (0.5 x 0.5), -9 dB = one eighth (0.5 x 0.5 x 0.5), -10 dB = one tenth, -20 dB = one hundredth (0.1 x 0.1), -30 dB = one thousandth (0.1 x 0.1 x 0.1).
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
To bring a received signal strength of '30 dB OVER Nine S units' down to 'Nine S units' supposes a drop of -30 dB, i.e., one thousandth of the original power. In this example, 100 watts would need to be brought down to 0.1 watt.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none