Trouble Questions Flashcards
What is meant by the statement: The satellite is operating in U/V mode?
The satellite uplink is in the 70 centimeter band and the downlink is in the 2 meter band
Which of the following can reduce overload of a VHF transceiver by a nearby commercial FM station?
Installing a band rejected filter
What is the maximum peak envelope power output for Technician class operators in their HF band segments.?
200 watts
Peak Envelope Power (PEP)
HF is two letters…think two letters….200 watts
When may amateur stations transmit information in support of broadcasting, assuming no other means are necessary?
When such communications are directly related to the safety of human life or protection of property.
Why do VHF signal strengths sometimes vary greatly when the antenna is moved only a few feet?
Multi-path propagation cancels or reinforces signals.
In which type of circuit is voltage the same across all components?
Parallel
When can a tech-class licensee be the control operator of a station operating in an exclusive Amateur Extra class operator segment of the amateur bands?
At no time
How can fundamental overload of a non-amateur radio or tv receiver by an amateur signal be reduced or eliminated?
Switch the transmitter to a narrow band mode
Which of the following is combined with an inductor to make a resonant circuit?
Capacitor
When configured to measure CURRENT, how is a multimeter connected to a component?
In series
How is a voltmeter connected to a component to measure APPLIED VOLTAGE?
In parallel
What is a LEO satellite?
A satellite in Low Earth Orbit (LEO)
What formula is used to calculate Resistance in a circuit?
R (Resistance) = E (voltage) / I (Current)
R = E / I
How do you calculate wavelength?
300 divided by frequency in megahertz.
If you do the math for 28.5 MHz, you will see it comes out to 10.5 something, indicating this frequency is inside the 10-meter band.
What is voltage?
The electromotive force that causes electrons to flow.
Voltage is measured in VOLTS.
What is current?
The flow of electrical charge; it’s the movement of electrons.
Electrical current is measured in AMPERES.
What is resistance?
The property that resists the flow of current.
Resistance is measured in OHMS.
Resistance opposes the flow of Alternating Current (AC), Direct Current (DC), and RF Current.
What is power?
The rate at which electrical energy is used.
Power is measured in watts.
What is capacitance?
Capacitance is the ability to store energy in an ELECTRIC field.
Its measured in farads.
The component in a circuit for this is a capacitor.
What is inductance?
The ability to store energy in a MAGNETIC field.
The unit of measure is the henry.
The component for this in an electric circuit is called an inductor.
What describes the number of times per second an alternating current makes a complete cycle?
Frequency
What electrical component stores energy in a magnetic field?
Diode
What is the frequency range of the 6 meter band.
50 to 54 MHz
What is the voltage across a 10 ohm resistor if a current of 1 amp flows through it?
Ohms Law: VOLTAGE equals CURRENT multiplied by RESISTANCE -Volts (E) -Current (I) -Resistance (R)
E = 1 x 10
Answer: 10 Volts
What is the proper grounding technique for a tower.
Separate 8ft long ground rods for each tower leg bonded to the tower and each other.
What type of transistor has a gate, drain, and source?
Field Effect
What is a relay?
An electrically controlled switch
Which decible value most closely represents a power increase from 5 watts to 10 watts?
A. 2 dB
B. 3 dB
C. 5 dB
D. 10 dB
B. 3 dB
Note:
Every 3 dB of gain multiplies your signal by 2.
Every 3 db dB of loss divides your signal by 2.
How is a volt meter connected to a component to measure applied voltage?
A. In Series
B. In Parallel
C. In Quadrature
D. In Phase
B. In Parallel
What is the approximate bandwidth of a VHF repeater phone signal?
A. Less than 500Hz
B. About 150kHz
C. Between 10 and 15kHz
D. Between 50 and 125kHz
C. Between 10 and 15kHz
What is impedance?
The opposition to AC current flow
Which of the following are 12 volt battery storage hazards?
A. Electrical Shock
B. Burns, fire, explosion.
C. RF emissions from nearby transmitter can cause them to emit poison gas.
D. All of the above
D. All of the above
What device converts RF input and output of a transceiver into another band.
A. High pass filter
B. Low pass filter
C. Transverter
D. Phase converter
C. Transverter
Which frequency is in the 6 meter band?
A. 49.00 MHz
B. 52.525 MHz
C. 28.52 MHz
D. 222.15 MHz
B. 52.525 MHz
6 meter band is 50 - 54 MHz
What type of circuit controls the amount of voltage from a power supply?
A. Regulator
B. Oscillator
C. Filter
D. Phase Inverter
A. Regulator
What is FT8?
A. A wide band voice band
B. A digital mode capable of low signal to noise operation
C. An eight channel multi mode for FM repeaters
D. Slow scan tv mode
B. A digital mode capable of low signal to noise operation
Which of the following describes DMR?
A. A technique for time multiplexing two digital voice signals on a single 12.5 kHz repeater channel.
B.
A. A technique for time multiplexing two digital voice signals on a single 12.5 kHz repeater channel.
