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You still need to set a ContentView for your new application; however, you are going to implement it slightly differently from how it is implemented here, so it is best to just remove the entire statement for now

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At frequencies above about 30 MHz, the lower atmosphere bends radio waves towards the surface (Fig 27-3) Tropospheric banding or tropo occurs because the index of refraction of air, with respect to EM waves, decreases with altitude The effect is similar to sound waves hugging the surface of a lake in the early morning, letting you hear a conversation a mile away Tropo makes it possible to communicate for hundreds of miles when the ionosphere will not return waves to the earth

This line uses setContentView( ) to draw the mainxml file to the screen Since you will not be using mainxml to define your TextView, you will not be setting it to your view Instead, you will be building the TextView in code

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Another type of tropospheric propagation is called ducting It takes place when EM waves are trapped in a layer of cool, dense air sandwiched between two layers of warmer air Like bending, ducting occurs almost entirely at frequencies above 30 MHz Still another tropospheric-propagation mode is troposcatter This takes place because air molecules, dust grains, and water droplets scatter some of the EM field at very high and ultra-high frequencies (above 30 MHz)

Your next step is to import the package TextView from androidwidget This will give you access to the TextView and let you create your own instance of it Place this code near the top of your current HelloWorldTextjava file, where the existing import statements are

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Radio waves can bounce off the aurora (northern and southern lights) This is auroral propagation, and it occurs at frequencies from roughly 15 to 250 MHz It can take place between stations separated by up to about 2000 miles Meteors entering the upper atmosphere produce ionized trails that persist for several seconds up to about a minute; these ions reflect EM waves and cause meteor-scatter propagation This mode allows communication for hundreds of miles at frequencies from 20 to 150 MHz The moon, like the earth, reflects EM fields This makes it possible to communicate via earth-moon-earth (EME), also called moonbounce High-powered transmitters, sophisticated antenna systems, and sensitive receivers are needed for EME Most EME is done by radio hams at frequencies from 50 MHz to over 2 GHz

import androidwidgetTextView;

Any communications receiver, whether analog or digital, audio or video, must do certain basic things well

Now, create an instance of TextView By creating the TextView instance, you can use it to display text to the screen without directly modifying mainxml Place the following code after the onCreate( ) statement is fired:

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TextView HelloWorldTextView = new TextView(this);

The sensitivity of a receiver is its ability to recover weak signals and process them into readable data The most common way to express receiver sensitivity is to state the number of ac signal microvolts at the antenna, needed to produce a given signal-to-noise (S/N) ratio Sometimes, the signal-plus-noise-to-noise ratio, abbreviated S+N/N, is given When you look at the specifications table for a radio receiver, you might see, for example, better than 03 V for 10 dB S/N This means that a signal of 03 V or less, at the antenna terminals, will result in a S/N ratio of 10 dB This figure is given as an example only and not as any sort of standard separating the good from the bad Technological advancements are always improving the sensitivity figures for communications receivers Besides that, a poor figure for one application, or on one frequency band, might be fine for some other intended use, or on some other frequency band The front end, or first RF amplifier stage, of a receiver is the most important stage with regard to sensitivity Sensitivity is directly related to the gain of this stage; but the amount of noise it generates is even more significant A good front end should produce the best possible S/N or S+N/N ratio at its output All subsequent stages will amplify the front-end noise output as well as the front-end signal output

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