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An electromagnetic wave propagates through a vacuum at approximately 300,000 meters/second This speed decreases as it passes through any type of dielectric material even air The E (electric) field and the H (magnetic) field of the electromagnetic wave are not only at 90 degree angles to each other (orthogonal), but they also increase and decrease in amplitude together over time, with one field regenerating the other as they travel through space This is referred to as TEM (transverse electric mode) propagation Radio wave propagation is conditional on the frequency of the RF carrier, and is by three main modes: Ground waves, which travel on top of and through the surface of the earth at frequencies below 1 MHz Surface waves also called space or direct waves which propagate through the atmosphere in an almost straight line from the transmitter to the receiver, and are the primary form of propagation for RF signals at 30 MHz and above (surface waves reach to slightly more than line-of-sight (LOS) distances because of atmospheric bending of the signal) Sky waves, which are RF signals at less than 30 MHz that refract and reflect off of the atmosphere s ionosphere, and are the chief means of low- and highpowered simplex long-range RF communications Even when direct line-of-site communications paths are used between the transmitter and the receiver, natural signal losses will begin to decrease the transmitted signal power to a level that comes closer and closer to the noise floor of the receiver s output This will obviously decrease signal-to-noise ratio (SNR), which increases the bit error rate (BER) of a digital system or increases the noise level of an analog system

image situations, the information about the colors or shades of gray in a single pixel, which is the smallest amount of information in a graphic image Using 24-bit color, each pixel can be set to any one of 16 million colors bitmap An image represented by specific values for every dot, or pixel, used to make

servers, and all those who access it are not remote, you d be at least somewhat assured that an Internet outage wouldn t affect your application But it isn t your connection to the Internet that can be prone to outages What if the site you re accessing has problems It s happened already In July 2008, Amazon s S3 cloud storage service went down for the second time that year A lot of applications were hosted by the company and all those services could not be accessed until techs could fix the problem Some applications were down for eight hours Also, there may simply be applications or data that you want located on-site If you have sensitive or proprietary information, your IT security group may simply mandate that you not store it on someone else s machines

Multipath fading effects, especially problematic at microwave frequencies, occur when a transmitted RF signal of interest bounces off a conductive object such as building pylons, light poles, or even the earth itself and reaches the receiver at a slightly different time than the direct RF signal This produces an out-of-phase reception condition, or phase cancellation, causing fading of the received signal The severity of microwave multipath effects depends on antenna height, frequency, gain, and sidelobe suppression The fading effect is also a huge problem in HF communications, since it also creates an intermittent or continuous decrease in the received signal s amplitude However, it is produced by the changing conditions of another reflective surface that is not so close to the surface of the earth: the ionosphere HF multipath can also be caused by multiple-path reception, such as when an HF

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You might also find that it s more difficult to integrate your applications if they are geographically dispersed That is, it is easier to manage and access your data if it is nearby, and not under someone else s control For instance, if you need two applications to exchange information, it s easier to do if they both reside in the same place If you have one application in-house and it has to contact another application on the cloud, it becomes far more complicated, and more prone to failure