Blog

Which of the following must be done to insure that a crystal oscillator provides the frequency specified by the crystal manufacturer? A. Provide the crystal with a specified parallel inductance B. Provide the crystal with a specified parallel capacitance C. Bias the crystal at...

Amateur Extra: Crystal Oscillator Frequency

Which of the following must be done to insure that a crystal oscillator provides the frequency specified by the crystal manufacturer? A. Provide the crystal with a specified parallel inductance B. Provide the crystal with a specified parallel capacitance C. Bias the crystal at...

What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50 ohm resistive load connected to the transmitter output? A. 8.75 watts B. 625 watts C. 2500 watts D. 5000 watts YAY MATH PEP or Peak Envelope...

General: Peak Envelope Power (PEP) Output

What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50 ohm resistive load connected to the transmitter output? A. 8.75 watts B. 625 watts C. 2500 watts D. 5000 watts YAY MATH PEP or Peak Envelope...

In which type of circuit is current the same through all components? A. Series B. Parallel C. Resonant D. Branch The answer here is A. Series.  The reason why is pretty straight forward.  If you line up a series (ha!) of components in a...

Technician: Circuit Types

In which type of circuit is current the same through all components? A. Series B. Parallel C. Resonant D. Branch The answer here is A. Series.  The reason why is pretty straight forward.  If you line up a series (ha!) of components in a...

At what time of year is Sporadic E propagation most likely to occur? A. Around the solstices, especially the summer solstice B. Around the solstices, especially the winter solstice C. Around the equinoxes, especially the spring equinox D. Around the equinoxes, especially the fall...

Amateur Extra: Sporadic E Propagation

At what time of year is Sporadic E propagation most likely to occur? A. Around the solstices, especially the summer solstice B. Around the solstices, especially the winter solstice C. Around the equinoxes, especially the spring equinox D. Around the equinoxes, especially the fall...

What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz? A. 7.178 to 7.181 MHz B. 7.178 to 7.184 MHz C. 7.175 to 7.178 MHz D. 7.1765 to 7.1795 MHz LSB, or Lower...

General: LSB Frequency Range

What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz? A. 7.178 to 7.181 MHz B. 7.178 to 7.184 MHz C. 7.175 to 7.178 MHz D. 7.1765 to 7.1795 MHz LSB, or Lower...

Which of these precautions should be taken when installing devices for lightning protection in a coaxial cable feed line? A. Include a parallel bypass switch for each protector so that it can be switched out of the circuit when running high power B. Include...

Technician: Coax Lightning Protection

Which of these precautions should be taken when installing devices for lightning protection in a coaxial cable feed line? A. Include a parallel bypass switch for each protector so that it can be switched out of the circuit when running high power B. Include...

What is an advantage of Gray code in digital communications where symbols are transmitted as multiple bits A. It increases security B. It has more possible states than simple binary C. It has more resolution than simple binary D. It facilitates error detection Firstly,...

Amateur Extra: Gray Code

What is an advantage of Gray code in digital communications where symbols are transmitted as multiple bits A. It increases security B. It has more possible states than simple binary C. It has more resolution than simple binary D. It facilitates error detection Firstly,...

Which of the following is a characteristic of a Class A amplifier? A. Low standby power B. High Efficiency C. No need for bias D. Low distortion By definition, a Class A amplifier operates on 100% of the input signal.   Because of this, they...

General: Class A Amplifier

Which of the following is a characteristic of a Class A amplifier? A. Low standby power B. High Efficiency C. No need for bias D. Low distortion By definition, a Class A amplifier operates on 100% of the input signal.   Because of this, they...

Which of the following is a good way to judge whether your uplink power is neither too low nor too high? A. Check your signal strength report in the telemetry data B. Listen for distortion on your downlink signal C. Your signal strength on...

Technician: Uplink Power

Which of the following is a good way to judge whether your uplink power is neither too low nor too high? A. Check your signal strength report in the telemetry data B. Listen for distortion on your downlink signal C. Your signal strength on...

What is meant by circularly polarized electromagnetic waves? A. Waves with an electric field bent into a circular shape B. Waves with a rotating electric field C. Waves that circle the Earth D. Waves produced by a loop antenna To answer this we need...

Amateur Extra: Circular Polarization

What is meant by circularly polarized electromagnetic waves? A. Waves with an electric field bent into a circular shape B. Waves with a rotating electric field C. Waves that circle the Earth D. Waves produced by a loop antenna To answer this we need...