T5D: Recognition and correction of problems, symptoms of overload and overdrive, distortion, over and under modulation, RF feedback, off frequency signals, fading and noise, problems with digital communications links
T5D01:
What is meant by fundamental overload in reference to a receiver?
Interference caused by very strong signals from a nearby source
Too much voltage from the power supply
Too much current from the power supply
Interference caused by turning the volume up too high
T5D02:
Which of the following is NOT a cause of radio frequency interference?
Doppler shift
Fundamental overload
Spurious emissions
Harmonics
T5D03:
What is the most likely cause of telephone interference from a nearby transmitter?
The transmitter's signals are causing the telephone to act like a radio receiver
Harmonics from the transmitter
Poor station grounding
Improper transmitter adjustment
T5D04:
What is a logical first step when attempting to cure a radio frequency interference problem in a nearby telephone?
Install an RF filter at the telephone
Install a low-pass filter at the transmitter
Install a high-pass filter at the transmitter
Improve station grounding
T5D05:
What should you do first if someone tells you that your transmissions are interfering with their TV reception?
Make sure that your station is operating properly and that it does not cause interference to your own television
Immediately turn off your transmitter and contact the nearest FCC office for assistance
Tell them that your license gives you the right to transmit and nothing can be done to reduce the interference
Continue operating normally because your equipment cannot possibly cause any interference
T5D07:
Which of the following may be useful in correcting a radio frequency interference problem?
All of these answers are correct
Snap-on ferrite chokes
Low-pass and high-pass filters
Notch and band-pass filters
T5D08:
What is the proper course of action to take when a neighbor reports that your radio signals are interfering with something in his home?
Check your station and make sure it meets the standards of good amateur practice
You are not required to do anything
Contact the FCC to see if other interference reports have been filed
Change your antenna polarization from vertical to horizontal
T5D09:
What should you do if a "Part 15" device in your neighbor’s home is causing harmful interference to your amateur station?
All of these answers are correct
Work with your neighbor to identify the offending device
Politely inform your neighbor about the rules that require him to stop using the device if it causes interference
Check your station and make sure it meets the standards of good amateur practice
T5D10:
What could be happening if another operator tells you he is hearing a variable high-pitched whine on the signals from your mobile transmitter?
The power wiring for your radio is picking up noise from the vehicle's electrical system
Your microphone is picking up noise from an open window
You have the volume on your receiver set too high
You need to adjust your squelch control
T5D11:
What may be the problem if another operator reports that your SSB signal is very garbled and breaks up?
RF energy may be getting into the microphone circuit and causing feedback
You have the noise limiter turned on
The transmitter is too hot and needs to cool off
You are operating on lower sideband
T5D12:
What might be the problem if you receive a report that your signal through the repeater is distorted or weak?
All of these answers are correct
Your transmitter may be slightly off frequency
Your batteries may be running low
You could be in a bad location
T5D13:
What is one of the reasons to use digital signals instead of analog signals to communicate with another station?
Many digital systems can automatically correct errors caused by noise and interference
Digital systems are less expensive than analog systems
Digital modulation circuits are much less complicated than any other types
All digital signals allow higher transmit power levels
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● = Review
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● = Incorrect answer
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