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Most domestic microwave ovens operate by emitting a very high power signal in the 2.4 GHz band. Older devices have poor shielding, [14] and often emit a very "dirty" signal over the entire 2.4 GHz band. [a] This can cause considerable difficulties to Wi-Fi and video [16] transmission, resulting in reduced range or complete blocking of the signal.
Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.
The main drawbacks of 2.4 GHz vs. these lower-frequency options are: poor signal penetration – 2.4 GHz connections are effectively limited to line of sight or soft obstacles; far less range – GSM or CDMA cell phones can connect reliably at > 16 km (10 mi) distances; the range of GSM, imposed by the parameters of time-division multiple ...
In electronics, an antenna amplifier (also: aerial amplifier or booster) is a device that amplifies an antenna signal, usually into an output with the same impedance as the input impedance. Typically 75 ohm for coaxial cable and 300 ohm for twin-lead cable. An antenna amplifier boosts a radio signal considerably for devices that receive radio ...
Schematic of an AGC used in the analog telephone network; the feedback from output level to gain is effected via a Vactrol resistive opto-isolator.. Automatic gain control (AGC) is a closed-loop feedback regulating circuit in an amplifier or chain of amplifiers, the purpose of which is to maintain a suitable signal amplitude at its output, despite variation of the signal amplitude at the input.
202.4.166.35 04:31, 10 April 2013 (UTC) I came to this page wondering WHY so many devices use 2.4 GHz specifically. I still don't know the answer and the page gives me no hint, no obvious path (ie articles linking to or from this article), although this article lists a dozen devices and protocols that do use 2.4 GHz.
The iPod Touch (stylized as iPod touch) is a discontinued line of iOS-based mobile devices designed and formerly marketed by Apple Inc. with a touchscreen-controlled user interface. As with other iPod models, the iPod Touch can be used as a portable media player and a handheld gaming device, but can also be used as a digital camera , a web ...
It originally shipped with iPhone OS 2 and fully supports iPhone OS 3 but has limited support for iOS 4 and did not receive support for home screen wallpapers and multitasking, but unlike the iPhone 3G, it did have support for the Game Center. [4] iOS 4.2.1 is the last iOS version supported on this iPod touch model.