Ham Radio Technician - Chapter 2

T5B02 What is another way to specify a radio signal frequency of 1,500,000 hertz? A. 1500 kHz B. 1500 MHz C. 15 GHz D. 150 kHz

A. 1500 kHz. 1 kHz is larger than 1 hertz, so you move the decimal 3 places to the left. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T5B12 Which of the following frequencies is equal to 28,400 kHz? A. 28.400 MHz B. 2.800 MHz C. 284.00 MHz D. 28.400 MHz

A. 28.400 MHz A MHz is larger than a kHz, so you move the decimal to the left 3 places. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T3Bo4 How fast does a radio wave travel through free space? A. At the speed of light. B. At the speed of sound. C. Its speed is inversely proportional to its wavelength. D. Its speed increases as the frequency increases.

A. At the speed of light. The speed of light is 300,000,000 meters per second.

T8A02 What type of modulation is commonly used for VHF packet radio transmissions? A. FM B. SSB C. AM D. Spread Spectrum

A. FM Frequency Modulation (FM) The process of adding information to an RF signal or carrier by varying its frequency. Used by most professional communications.

T5C05 What is the unit of frequency? A. Hertz B. Henry C. Farad D. Tesla

A. Hertz. 1 Hz = 1 cycle per second.

T2B06 What happens when the deviation of the FM transmitter is increased? A. Its signal occupies more bandwidth B. Its output power increases C. Its output power and bandwidth increases D. Asymmetric modulation occurs

A. Its signal occupies more bandwidth. As deviation increases, so does the signal's bandwidth, so excessive deviation can cause interference to signals on nearby frequencies.

T2B07 What could cause your FM signal to interfere with stations on nearby frequencies? A. Microphone gain too high, causing over-deviation B. SWR too high C. Incorrect CTCSS Tone D. All of these choices are correct

A. Microphone gain too high, causing over-deviation. Speaking louder into the microphone of an FM transmitter increases deviation.

T5Bo4 How many volts are equal to one microvolt? A. One one-millionth of a volt B. One million volts C. One thousand kilovolts D. One one-thousandth of a volt?

A. One one-millionth of a volt. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T5C06 What does the abbreviation "RF" refer to? A. Radio frequency signals of all types B. The resonant frequency of a tuned circuit C. The real frequency transmitted as opposed to the apparent frequency D. Reflective force in antenna transmission lines

A. Radio frequency signals of all types Generally considered to be any electrical signal with a frequency higher than 20 kHz up to 300 GHz.

T3B07 What property of radio waves is often used to identify the different frequency bands? A. The approximate wavelength. B. The magnetic intensity of waves. C. The time it takes for waves to travel one mile. D. The voltage standing wave ratio of waves.

A. The approximate wavelength. The most common bands for technicians are 6 meter (40-54 MHz), 2 meter (144-148 MHz), and 70 cm (420-450 MHz).

T8A06 Which sideband is normally used for 10 meter HF, VHF, and UHF single-sideband communications? A. Upper sideband B. Lower sideband C. Suppressed sideband D. Inverted sideband

A. Upper sideband Above 10 MHz, upper sideband is used. Below 10 MHz, lower sideband is used.

T5B05 Which of the following is equivalent to 500 milliwatts? A. 0.02 watts B. 0.5 watts C. 5 watts D. 50 watts

B. 0.5 watts. A watt is bigger than a milliwatt, so the decimal is moved to the left 3 places. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T5B08 How many microfarads are 1,000,000 picofarads? A. 0.001 microfarads B. 1 microfarad C. 1000 microfarads D. 1,000,000,000 microfarads

B. 1 microfarad Nanofarads are bigger than picofarads, and microfarads are bigger than nanofarads, you must move the decimal to the left 6 places. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T8A11 What is the approximate maximum bandwidth required to transmit a CW signal? A. 2.4 kHz B. 150 Hz C. 1000 Hz D. 15 kHz

B. 150 Hz

T8A08 What is the approximate bandwidth of a singe sideband voice signal? A. 1 kHz B. 3 kHz C. 6 kHz D. 15 kHz

B. 3 kHz

T3B08 What are the frequency limits of the VHF spectrum? A. 30 to 300 kHz B. 30 to 300 MHz C. 300 to 3000 kHz D. 300 to 3000 MHz

B. 30 to 300 MHz. Very high frequency (VHF) is usually measured in MHz, not kHz. If there is a question on the technician test with answers that use MHz and kHz, avoid the kHz answer unless it is converting up or down in the metric scale (ie hertz to kHz).

T3B11 What is the approximate velocity of a radio wave as it travels through free space? A. 3000 kilometers per second B. 300,000,000 meters per second C. 300,000 miles per hour D. 186,000 miles per hour

B. 300,000,000 meters per second 300,000,000 meters per second is also known as the speed of light.

T7A02 What is a transceiver? A. A type of antenna switch B. A unit combining the function of a transmitter and a receiver C. A component in a repeater which filters out unwanted interference D. A type of antenna matching network

B. A unit combining the function of a transmitter and receiver. Also written as XCVR.

T3B05 How does the wavelength of a radio wave relate to its frequency? A. The wavelength gets longer as the frequency increases. B. The wavelength gets shorter as the frequency increases. C. There is no relationship between wavelength and frequency. D. The wavelength depends on the bandwidth of the signal.

B. The wavelength gets shorter as the frequency increases. Think of it as teeth on a saw, more teeth per inch (higher frequency) means thinner teeth(wavelength).

T5B01 How many milliamperes is 1.5 amperes? A. 15 milliamperes B. 150 milliamperes C. 1500 milliamperes D. 15000 milliamperes

C. 1500 milliamperes Most conversions are done by moving the decimal to the left or right by 3 places. If the unit of measure is smaller, move the right, if it is bigger, move the left. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T5B13 If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz? A. 0.002425 GHz B. 24.25 GHz C. 2.425 GHz D. 2425 GHz

C. 2.425 GHZ A. A MHz is smaller than a GHz so the decimal is moved 3 places to the left. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T5B06 If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show? A. 0.003 amperes B. 0.3 amperes C. 3 amperes D. 3,000,000 amperes

C. 3 amperes. An ampere is bigger than a milliampere, so the decimal point is moved to the left 3 places. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T3B10 What frequency range is referred to as HF? A. 300 to 3000 MHz B. 30 to 300 MHz C. 3 to 30 MHz D. 300 to 3000 kHz

C. 3 to 300 MHz High frequency (HF) is usually measured in MHz, not in kHz. If there is a question on the technician test with answers that use MHz and kHz, avoid the kHz answer unless it is converting up or down in the metric scale (ie hertz to kHz).

T5B07 If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz? A. 0.003525 kHz B. 35.25 kHz C. 3525 kHz D. 3,525,000 kHz

C. 3525 kHz A MHz is larger than a kHz, so the decimal point is moved to the right 3 places. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T8A10 What is the typical bandwidth of analog fast-scan TV transmission on the 70 cm band? A. More than 10 MHz B. About 6 MHz C. About 3 MHz D. About 1 MHz

C. About 3 MHz

T8A09 What is the approximate bandwidth of a VHF repeater FM phone signal? A. Less than 500 Hz B. About 150kHz C. Between 10 and 15 kHz D. Between 50 and 125 kHz

C. Between 10 and 15 kHz

T8A05 Which of the following types of emission has the narrowest bandwidth? A. FM voice B. SSB voice C. CW D. Slow-scan TV

C. CW Continuous wave (CW), radio communication transmitted by on/off keying of a continuous radio-frequency signal. Another name for international Morse code.

T5B03 How many volts are equal to one kilovolt? A. One one-thousandth of a volt B. One hundred volts C. One thousand volts D. One million volts

C. One thousand volts. The volt is smaller than the kilovolt, so the decimal is moved to the right 3 places. Tera 1,000,000,000,000 Giga 1,000,000,000 Mega 1,000,000 Kilo 1,000 Hecta 100 Deca 10 meter (unit) 1 deci 0.1 centi 0.01 milli 0.001 micro 0.000001 nano 0.000000001 pico 0.000000000001

T1F09 What type of amateur station simultaneously retransmits the signal of another amateur station on a different channel or channels? A. Beacon station B. Earth station C. Repeater station D. Message forwarding station

C. Repeater A repeater retransmits signals to give them greater range.

T8A03 Which type of voice mode is most often used for long-distance (weak signal) contacts on the VHF and UHF bands? A. FM B. DRM C. SSB D. PM

C. SSB Single sideband (SSB) is a form of amplitude modulation (AM) in which one sideband and the carrier are removed. SSB is concentrated to a narrow bandwidth it is better for long distance and poor conditions than FM or AM.

T8A07 What is the primary advantage of single sideband over FM for voice transmissions? A. SSB signals are easier to tune B. SSB signals are less susceptible to interference C. SSB signals have narrower bandwidth D. All of these choices are correct

C. SSB signals have narrower bandwidth Single sideband (SSB) is a form of amplitude modulation (AM) in which one sideband and the carrier are removed. SSB is concentrated to a narrow bandwidth it is better for long distance and poor conditions than FM or AM.

T2B05 What determines the amount of deviation of an FM (as opposed to PM) signal? A. Both the frequency and amplitude of the modulating signal B. The frequency of the modulating signal C. The amplitude of the modulating signal D. The relative phase of the modulating signal and the carrier

C. The amplitude of the modulating signal

T3B01 What is the name for the distance a radio wave travels during one complete cycle? A. Wave speed B. Waveform C. Wavelength D. Wave spread

C. Wavelength Wavelength also relates to frequency. As the frequency of waves increase, the waves are closer together. The wavelength gets shorter as the frequency increases. Think of it as teeth on a saw, more teeth per inch (higher frequency) means thinner teeth(wavelength).

T3B09 What are the frequency limits of the UHF spectrum? A. 30 to 300 kHz B. 30 to 300 MHz C. 300 to 3000 kHz D. 300 to 3000 MHz

D. 300 to 3000 MHz. Ultra high frequency (UHF) is usually measured in MHz, not kHz. UHF may also be listed as 300 MHz to 3 GHz. 3000 MHz = 3 GHz. If there is a question on the technician test with answers that use MHz and kHz, avoid the kHz answer unless it is converting up or down in the metric scale (ie hertz to kHz).

T1B09 Why should you not set your transmit frequency to be exactly at the edge of an amateur band or sub-band? A. To allow for calibration error in the transmitter frequency display B. So that modulation sidebands do not extend beyond the band edge C. To allow for transmitter frequency drift D. All of these choices are correct

D. All of these choices are correct

T8A04 Which type of modulation is most commonly used for VHF and UHF repeaters? A. AM B. SSB C. PSK D. FM

D. FM Frequency Modulation (FM) is used in repeaters because it's signal is carried only by variations in the signal's frequency.

T5A12 What term describes the number of times per second that alternating current reverses directions? A. Pulse Rate B. Speed C. Wavelength D. Frequency

D. Frequency

T3B06 What is the formula for converting frequency to approximate wavelength in meters? A. Wavelength in meters equals frequency in hertz multiplied by 300. B. Wavelength in meters equals frequency in hertz divided by 300. C. Wavelength in meters equal frequency in megahertz divided by 300. D. Wavelength in meters equals 300 divided by frequency in megahertz.

D. Wavelength in meters equals 300 divided by the frequency in megahertz. 300 Wavelength in meters =_________________ Frequency in megahertz