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Compared to the SM58, the SM57's grille allows for closer placement to the source of sound, while the SM58 provides a pop filter to reduce plosives ("pop" sounds) and wind. According to Shure, the SM57 frequency response extends from 40 Hertz (Hz) to 15 kHz. It is manufactured in the United States, Mexico, and China.
Compared to the SM57, the SM7 has a flatter (more neutral) frequency response, but also has two recessed switches for tailoring the response curve. One switch is a high-pass filter to reduce low frequency rumble, and the other is a mid-frequency reduction to attenuate and flatten out the SM7's inherent "presence" peak. [4] [5]
Frequency response 50 to 15,000 Hz [9] Polar pattern Cardioid, [9] rotationally symmetrical about microphone axis, uniform with frequency Sensitivity (at 1,000 Hz Open Circuit Voltage) −54.5 dBV/Pa (1.85 mV); 1 Pa = 94 dB SPL [9] Impedance Rated impedance is 150 Ω (300 Ω actual) for connection to microphone inputs rated low impedance [9 ...
US frequency allocations chart, 2016. Frequency allocation (or spectrum allocation) is the part of spectrum management dealing with the designation and regulation of the electromagnetic spectrum into frequency bands, normally done by governments in most countries. [1]
In the Americas (defined as International Telecommunication Union (ITU) region 2), the FM broadcast band consists of 101 channels, each 200 kHz wide, in the frequency range from 87.8 to 108.0 MHz, with "center frequencies" running from 87.9 MHz to 107.9 MHz. For most purposes an FM station is associated with its center frequency.
Morse code is called the original digital mode. Radio telegraphy, designed for machine-to-machine communication is the direct on / off keying of a continuous wave carrier by Morse code symbols, often called amplitude-shift keying or ASK, may be considered to be an amplitude modulated mode of communications, and is rightfully considered the first digital data mode.
The list of frequency ranges is called a band allocation, which may be set by international agreements, and national regulations. The modes and types of allocations within each frequency band is called a bandplan; it may be determined by regulation, but most typically is set by agreements between amateur radio operators.
The 27 MHz CB27/81 Bandplan is a list of the channel frequencies for FM CB radio in the United Kingdom. Unlike CB usage in the United States , and subsequently elsewhere in the world, the original UK 40 channels progress in order with 10 kHz spacing.