Why is the bandwidth and the cutoff frequency found at the level of "−3 dB"? Why we always take 3 dB down gain of a filter? Full width at half maximum (FWHM). Answer: That is the point where the energy (power) is fallen to the value ½ or 0.5 = 50 percent of the initial...
The apparent powerSis calculated according to Pythagoras, the active powerPand reactive powerQ.S= √(P2+Q2) Electrical Measurement Definitions QuantityNameDefinition frequencyfhertz (Hz)1/s forceFnewton (N)kg·m/s² pressureppascal (Pa) = N/m²kg/m·s² ...
what design can be used to get generate EM electromagnetic field with strength about 60-65 V/m, in form of directed beam that cover the area of approx. ≈ 400cm2, within frequency range ≈ 2000-2500 MHz, at a min distance from the emitter? What is suitable for this, only microwave ...
Before building a filter that will be connected to a transmitter output, study filters made for that frequency and power level to learn what types of components are used. Also study how the filter is constructed and whether the components require cooling or special orientation to avoid coupling b...
● Combining decibels - adding up to 10 incoherent acoustic levels ● The decibel calculator can be used to combine the levels of up to ten incoherent (noncoherent) electric or acoustic sources when the level of each source is known in decibels (dB). Level 1 dB Level 2 dB Level 3 dB ...