Chapter 2: Radio and Signals Fundamentals Flashcards
How many milliamperes is 1.5 amperes?
1.5A = 1,500 mA
What is another way to specify a radio signal frequency of 1,500,000 hertz?
1,500,000Hz = 1,500kHz, 1.5MHz
How many volts are equal to one kilovolt?
1kV=1000V
How many volts are equal to one micro volt?
1microvolt=one one-millionth of a volt
Which of the following is equivalent to 500mW?
500mW = 0.5W
If an ammeter calibrated in amperes is used to measure a 3000-milliamperes current, what reading would it show?
3000mA=3A
If a frequency display calibrated in MHz shows a reading of 3.525MHz, what would it show if it were calibrated in kHz?
3.525MHz = 3,525kHz
How many microfarads are 1,000,000 picofarads?
1,000,000pF = 1 microfarad
Which of the following frequencies is equal to 28,400kHz?
28,400kHz = 28.4MHz
If a frequency display shows a reading of 2425MHz, what frequency is that in GHz
2425MHz = 2.425GHz
What describes the number of times per second that an alternating current makes a complete cycle?
The number of cycles per second is the signals frequency, represented by “f”
What are the frequency limits of the VHF spectrum?
30MHz-300MHz
What are the frequency limits of the UHF spectrum?
300MHz to 3,000MHz (3GHz)
What frequency range is referred to as HF?
3MHz - 30MHz
What is the name for the distance a radio wave travels during one complete cycle?
Wavelength
How fast does a radio wave travel through free space?
Speed of light (or 300,000,000 m/s)
How does the wavelength of a radio wave relate to its frequency?
Inversely proportional. As frequency increases, wavelength decreases and vice-versa
What is the formula for converting frequency to approximate wavelength in meters?
Wavelength in meters = 300 / f in MHz
What property of radio waves is often used to identify the different frequency bands?
Referred to by their wavelengths (i.e. the meter band for 146.52MHz)
What is the approximate velocity of a radio wave as it travels through free space?
300,000,000 meters per second
What is a transceiver?
Equipment that combines the transmitter and receiver into a single piece of equipment
What type of amateur station simultaneously retransmits the signal of another amateur station on a different channel or channels?
Repeaters
