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At VHF and UHF, an improvement in reception can result from moving the transmitting or receiving antenna just a few inches In mobile VHF/UHF operation, when the transmitter and/or receiver are moving, dead spots produce holes or picket fencing in the received signal

Application: Hello World!

In this section, you will create another Hello World! application for Android However, this time you will program the UI in code rather than by using the xml file and you will actually do most of the work The first step here is to remove the TextView code that is in mainxml The following section of code represents the TextView Removing it essentially makes your application an empty shell

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At frequencies below about 10 MHz, the earth s surface conducts ac quite well Because of this, vertically polarized EM waves follow the surface for hundreds or even thousands of miles, with the earth helping to conduct the E flux The lower the frequency, the lower the ground loss and the farther the waves travel by surface-wave propagation Horizontally polarized waves do not travel well in this mode, because horizontal E flux is shorted out by the earth Above about 10 MHz, the earth becomes lossy, and surface-wave propagation is not useful for more than a few miles Significant surface-wave communications are done mainly at very low, low, and medium frequencies (up to 3 MHz)

5 If x2 3x 4 0, then the solutions are a x 4; 1 d x 4; 1 6 If 2x2 4x 9 0, the solutions are p p 2 22 2 22 a x b x 2 2p p 22 22 c x 2 d x 2 2 2 7 If x2 1 0, the solutions are 4 a x 1 2 b x 1 4 c x 1 8 d x 1 16 b x 4; 1 c x 4; 1

<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Hello World, HelloWorldText" />

The earth s ionosphere, at altitudes from about 35 miles to 250 miles, has a great effect on EM waves at frequencies below about 100 MHz

After you have removed the TextView code, your mainxml file should look like this:

p 77 2

Radio wave propagation 501 The ionosphere consists of three layers, called the D layer, E layer, and F layer The layers form at different altitudes, with the D layer lowest and the F layer highest (Fig 27-2) The D layer absorbs radio waves at frequencies below about 7 MHz The E and F layers return radio waves to the earth by a process called ionospheric refraction

< xml version="10" encoding="utf-8" > <LinearLayout xmlns:android=http://schemasandroidcom/apk/res/android android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > </LinearLayout>

27-2

Now that you have a clean mainxml file, and thus a clean application shell, you can begin to add the code that will display Hello World! on the screen Start by opening the HelloWorldTextjava file and removing the following line:

x 1 1 13 , the solutions are x 2 x x2 2x p 1 57 a x 11 only b x 2 p 57 d x 1 2 2x 3 , the solutions are x x 2 x 2

setContentView(Rlayoutmain);

The D layer is dense during daylight and vanishes at night This makes long-distance sky-wave propagation poor during the daytime and excellent at night on frequencies below about 7 MHz The D layer s disappearance at dusk is responsible for the dramatic change in the behavior of the AM broadcast band (535 kHz to 1 605 MHz) that occurs after sunset The E layer varies in density with the 11-year sunspot cycle The greatest ionization is during peak sunspot years (1979, 1990, 2001, etc) and the least is during slack years Solar flares cause the E layer to form dense regions that return radio waves to earth at frequencies as high as 100 MHz The E layer can produce communications over distances of hundreds or even thousands of miles The F layer returns radio waves at all frequencies up to a certain maximum, called the maximum usable frequency (MUF) The MUF varies depending on the sunspot cycle and also on day-to-day solar activity Reliable communications can usually be had up to about 7 MHz during the night and 15 MHz during the day when sunspot activity is minimum; this increases to perhaps 20 MHz at night and 50 MHz during the day when sunspot numbers are maximum All the ionospheric modes are called sky-wave propagation This is the mode responsible for worldwide shortwave communications and for nighttime AM broadcast reception over thousands of miles

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