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On the 10-meter band, the frequency portion above 29.5 MHz is used for FM repeater use.

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The solar flux index indicates the amount of solar activity. The higher the solar flux index numbers, the greater the larger amount of solar activity on the sun. The frequency of 2.8 GHz (10.7 centimeters) was chosen because the numbers are valid under all conditions. A measure of solar radiation at 10.7 centimeters wavelength is called the solar flux index.

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The way an antenna tuner increases power transfer is by matching the impedance of the radio, to the impedance at the end of the feedline that connects the radio to the antenna.

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2.4 watts of electrical power are used by a 12-VDC (volts direct current) light bulb that draws 0.2 amperes. Here’s the math. They want to know the watts, or electrical power. We are given the voltage of 12 VDC, and the current draw of 0.2 amperes. Using Ohm’s Law, we know that Power in Watts = Amperes * Volts. So, Watts = 0.2 amperes * 12 VDC. Thus 0.2 amperes * 12 VDC = 2.4 watts.

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It is a commonly accepted amateur practice, that 20-meter and higher wavelength bands use the upper sideband for voice communications. Thus, using this as a rule, you can deduce that any frequency in the 160-, 75-, and 40-meter and lower wavelength bands use lower sideband for voice.

General 2023-2027

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