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A ferrite bead – also called a ferrite block, ferrite core, ferrite ring, EMI filter, or ferrite choke [1] [2] – is a type of choke that suppresses high-frequency electronic noise in electronic circuits. Ferrite beads employ high-frequency current dissipation in a ferrite ceramic to build high-frequency noise suppression devices.
A muzzle shroud, linear compensator, blast shield, forward blast diverter or concussion reduction device (CRD) is a sleeve (either circular or otherwise) that attaches to and extends beyond the muzzle of a firearm in order to redirect some of the noise and concussion, or shock wave, from the muzzle blast forward and away from the shooter, and ...
The short terms "ferrite rod" or "loop-stick" sometimes refer to the coil-plus-ferrite combination that takes the place of both an external antenna and the radio's first tuned circuit or just the ferrite core itself (the cylindrical rod or flat ferrite slab). These broadcast ferrite rod aerials nearly always have a permeability of 125. [8]
In the field, however, the comparatively large size of a centerfire rifle suppressor can cause unwanted noise if it bumps or rubs against vegetation or rocks, so many users cover them with neoprene sleeves. [55] Silencers reduce firing recoil, primarily by diverting and trapping the propellant gas.
Measurements indicate that on a rifle, a muzzle brake adds 5 to 10 dB to the normal noise level perceived by the shooter, increasing total noise levels up to 160 dB(A) ± 3 dB. [20] Painful discomfort occurs at approximately 120 to 125 dB(A), [ 21 ] with some references claiming 133 dB(A) for the threshold of pain.
For best signal-to-noise ratio these are best located outdoors away from sources of electrical interference. Examples of such medium wave antennas [ 12 ] include broadband untuned loops, elongated terminated loops, wave antennas (e.g. the Beverage antenna ) and the ferrite sleeve loop antenna.
Faraday cages are routinely used in analytical chemistry to reduce noise while making sensitive measurements. Faraday cages, more specifically dual paired seam Faraday bags, are often used in digital forensics to prevent remote wiping and alteration of criminal digital evidence.
A ferrite loopstick antenna, a small loop used for AM reception in a portable radio, consisting of a wire wound around a ferrite core; the most common type of loop antenna today. A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, or other electrical conductor , that for transmitting is usually fed by a balanced ...