T0C-2010: RF hazards; radiation exposure, proximity to antennas, recognized safe power levels, exposure to others
T0C01:
What type of radiation are VHF and UHF radio signals?
Non-ionizing radiation
Gamma radiation
Ionizing radiation
Alpha radiation
T0C02:
Which of the following frequencies has the lowest Maximum Permissible Exposure limit?
50 MHz
3.5 MHz
440 MHz
1296 MHz
T0C03:
What is the maximum power level that an amateur radio station may use at VHF frequencies before an RF exposure evaluation is required?
50 watts PEP at the antenna
1500 watts PEP transmitter output
1 watt forward power
50 watts PEP reflected power
T0C04:
What factors affect the RF exposure of people near an amateur station antenna?
All of these choices are correct
Frequency and power level of the RF field
Distance from the antenna to a person
Radiation pattern of the antenna
T0C05:
Why do exposure limits vary with frequency?
The human body absorbs more RF energy at some frequencies than at others
Lower frequency RF fields have more energy than higher frequency fields
Lower frequency RF fields do not penetrate the human body
Higher frequency RF fields are transient in nature
T0C06:
Which of the following is an acceptable method to determine that your station complies with FCC RF exposure regulations?
All of these choices are correct
By calculation based on FCC OET Bulletin 65
By calculation based on computer modeling
By measurement of field strength using calibrated equipment
T0C07:
What could happen if a person accidentally touched your antenna while you were transmitting?
They might receive a painful RF burn
Touching the antenna could cause television interference
They might develop radiation poisoning
All of these choices are correct
T0C08:
Which of the following actions might amateur operators take to prevent exposure to RF radiation in excess of FCC-supplied limits?
Relocate antennas
Relocate the transmitter
Increase the duty cycle
All of these choices are correct
T0C09:
How can you make sure your station stays in compliance with RF safety regulations?
By re-evaluating the station whenever an item of equipment is changed
By informing the FCC of any changes made in your station
By making sure your antennas have low SWR
All of these choices are correct
T0C10:
Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?
It affects the average exposure of people to radiation
It affects the peak exposure of people to radiation
It takes into account the antenna feedline loss
It takes into account the thermal effects of the final amplifier
T0C11:
What is meant by "duty cycle" when referring to RF exposure?
The ratio of on-air time to total operating time of a transmitted signal
The difference between lowest usable output and maximum rated output power of a transmitter
The difference between PEP and average power of an SSB signal
The amount of time the operator spends transmitting
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