If your neighbor reports television interference on one or two channels only when you are transmitting on the 15-meter band, what is probably the cause of the interference?
A. Too much low-pass filtering on the transmitter
B. De-ionization of the ionosphere near your neighbor's TV antenna
C. TV receiver front-end overload
D. Harmonic radiation from your transmitter
If harmonic radiation from your transmitter is causing interference to television receivers in your neighborhood, who is responsible for taking care of the interference?
A. The owners of the television receivers are responsible
B. Both you and the owners of the television receivers share the responsibility
C. You alone are responsible, since your transmitter is causing the problem
D. The FCC must decide if you or the owners of the television receivers are responsible
What is meant by harmonic radiation?
A. Unwanted signals at frequencies that are multiples of the fundamental (chosen) frequency
B. Unwanted signals that are combined with a 60-Hz hum
C. Unwanted signals caused by sympathetic vibrations from a nearby transmitter
D. Signals that cause skip propagation to occur
How does the frequency of a harmonic compare to the desired transmitting frequency?
A. It is slightly more than the desired frequency
B. It is slightly less than the desired frequency
C. It is exactly two, or three, or more times the desired frequency
D. It is much less than the desired frequency
Why do modern HF transmitters have a built-in low-pass filter in their RF output circuits?
A. To reduce RF energy below a cutoff point
B. To reduce low-frequency interference to other amateurs
C. To reduce harmonic radiation
D. To reduce fundamental radiation
What type of filter might be connected to an amateur HF transmitter to cut down on harmonic radiation?
A. A key-click filter
B. A low-pass filter
C. A high-pass filter
D. A CW filter
If you are told that your amateur station is causing television interference, what should you do?
A. First make sure that your station is operating properly, and that it does not cause interference to your own television
B. Immediately turn off your transmitter and contact the nearest FCC office for assistance
C. Connect a high-pass filter to the transmitter output and a lowpass filter to the antenna-input terminals of the television
D. Continue operating normally, because you have no reason to worry about the interference
What is meant by receiver overload?
A. Too much voltage from the power supply
B. Too much current from the power supply
C. Interference caused by strong signals from a nearby source
D. Interference caused by turning the volume up too high
If your neighbor reports television interference whenever you are transmitting from your amateur station, no matter what frequency band you use, what is probably the cause of the interference?
A. Too little transmitter harmonic suppression
B. Receiver VR tube discharge
C. Receiver overload
D. Incorrect antenna length
If signals from your transmitter are causing front-end overload in your neighbor's television receiver, who is responsible for taking care of the interference?
A. You alone are responsible, since your transmitter is causing the problem
B. Both you and the owner of the television receiver share the responsibility
C. The FCC must decide if you or the owner of the television receiver are responsible
D. The owner of the television receiver is responsible
What type of filter should be connected to a TV receiver as the first step in trying to prevent RF overload from an amateur HF station transmission?
C. Band pass
What first step should be taken at a cable TV receiver when trying to prevent RF overload from an amateur HF station transmission?
A. Install a low-pass filter in the cable system transmission line
B. Tighten all connectors and inspect the cable system transmission line
C. Make sure the center conductor of the cable system transmission line is well grounded
D. Install a ceramic filter in the cable system transmission line
What effect might a break in a cable television transmission line have on amateur communications?
A. Cable lines are shielded and a break cannot affect amateur communications
B. Harmonic radiation from the TV receiver may cause the amateur transmitter to transmit off-frequency
C. TV interference may result when the amateur station is transmitting, or interference may occur to the amateur receiver
D. The broken cable may pick up very high voltages when the amateur station is transmitting
If your mobile transceiver works in your car but not in your home, what should you check first?
A. The power supply
B. The speaker
C. The microphone
D. The SWR meter
Signal Strength and Quality
What does RST mean in a signal report?
A. Recovery, signal strength, tempo
B. Recovery, signal speed, tone
C. Readability, signal speed, tempo
D. Readability, signal strength, tone
What should you check if you change your transceiver's microphone from a mobile type to a base station type?
B. Make an on-the-air radio check to ensure the quality of your signal
C. Check the amount of current the transceiver is now using
D. Check to make sure the frequency readout is now correct
What is the meaning of: "Your signal report is five nine plus 20 dB..."?
A. Your signal strength has increased by a factor of 100
B. Repeat your transmission on a frequency 20 kHz higher
C. The bandwidth of your signal is 20 decibels above linearity
D. A relative signal-strength meter reading is 20 decibels greater than strength 9
The answer to each question is coded in the 3rd position of the question number.
Example: The answer to question T24C06 is D.
1 = A
2 = B
3 = C
4 = D