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  2. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    The cutoff frequency is the critical frequency between propagation and attenuation, which corresponds to the frequency at which the longitudinal wavenumber is zero. It is given by ω c = c ( n π a ) 2 + ( m π b ) 2 {\displaystyle \omega _{c}=c{\sqrt {\left({\frac {n\pi }{a}}\right)^{2}+\left({\frac {m\pi }{b}}\right)^{2}}}} The wave equations ...

  3. Radio-controlled aircraft - Wikipedia

    en.wikipedia.org/wiki/Radio-controlled_aircraft

    A radio-controlled aircraft (often called RC aircraft or RC plane) is a small flying machine that is radio controlled by an operator on the ground using a hand-held radio transmitter. The transmitter continuously communicates with a receiver within the craft that sends signals to servomechanisms (servos) which move the control surfaces based on ...

  4. Chebyshev filter - Wikipedia

    en.wikipedia.org/wiki/Chebyshev_filter

    However, non-standard cutoff attenuations may be accommodated by calculating the target values in step 5 to be offset from the required 1 that exists at the cut-off frequency of =, including a () denominator as part of the derivative constant that includes transmission zeros, and inserting two reflection zeros instead of one in to the original ...

  5. Radio control - Wikipedia

    en.wikipedia.org/wiki/Radio_control

    As the emerging multitude of 2.4 GHz band spread spectrum RC systems usually use a "frequency-agile" mode of operations, like FHSS that do not stay on one set frequency any longer while in use, the older "exclusive use" provisions at model flying sites needed for VHF-band RC control systems' frequency control, for VHF-band RC systems that only ...

  6. Butterworth filter - Wikipedia

    en.wikipedia.org/wiki/Butterworth_filter

    The function is defined by the three poles in the left half of the complex frequency plane. Log density plot of the transfer function H ( s ) {\displaystyle H(s)} in complex frequency space for the third-order Butterworth filter with ω c {\displaystyle \omega _{c}} =1.

  7. Half-power point - Wikipedia

    en.wikipedia.org/wiki/Half-power_point

    The half-power point is the point at which the output power has dropped to half of its peak value; that is, at a level of approximately −3 dB. [1] [a]In filters, optical filters, and electronic amplifiers, [2] the half-power point is also known as half-power bandwidth and is a commonly used definition for the cutoff frequency.

  8. RL circuit - Wikipedia

    en.wikipedia.org/wiki/RL_circuit

    Compare this with the behaviour of the resistor output in an RC circuit, where the reverse is the case. The range of frequencies that the filter passes is called its bandwidth. The point at which the filter attenuates the signal to half its unfiltered power is termed its cutoff frequency. This requires that the gain of the circuit be reduced to

  9. Matched Z-transform method - Wikipedia

    en.wikipedia.org/wiki/Matched_Z-transform_method

    The s-plane poles and zeros of a 5th-order Chebyshev type II lowpass filter to be approximated as a discrete-time filter The z-plane poles and zeros of the discrete-time Chebyshev filter, as mapped into the z-plane using the matched Z-transform method with T = 1/10 second.

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