RF exposure limits and FCC Part 97 regulatory concepts for amateur radio station operation.
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- What is FCC Part 97?
- The federal regulation governing amateur radio service in the United States
- Name the three amateur radio license classes in the United States.
- Technician, General, and Extra
- What is the FCC RF exposure limit for controlled environments at amateur radio stations?
- 5 milliwatts per square centimeter, averaged over 6 minutes
- What RF exposure limit applies to the general public in areas they might access?
- 1 milliwatt per square centimeter, averaged over 30 minutes (uncontrolled exposure)
- Below what frequency does the FCC consider there to be no RF hazard?
- 300 kilohertz (300 kHz)
- What is duty cycle in the context of RF safety?
- The percentage of time a transmitter is actually transmitting compared to total time
- What must be posted at an amateur radio station transmitting RF fields that exceed exposure limits?
- An RF hazard warning sign or label
- What does FCC Part 97.113 prohibit?
- Business communications and transmissions for commercial purposes
- How often must an amateur radio operator transmit their call sign?
- At least once every 10 minutes during a communication and at the end of communication
- What is the primary responsibility of an amateur radio operator regarding harmful interference?
- To cease transmission immediately and take steps to eliminate interference when notified
- What frequency range constitutes the 2-meter amateur band?
- 144 to 148 megahertz (144-148 MHz)
- What frequency range constitutes the 70-centimeter amateur band?
- 420 to 450 megahertz (420-450 MHz)
- Must amateur radio equipment be type accepted by the FCC?
- Yes, transmitting equipment must be type accepted or FCC certified to be legally operated
- What is a repeater in amateur radio?
- A station that receives a signal on one frequency and retransmits it on another frequency
- What is a standard offset used for 2-meter repeaters in North America?
- Plus or minus 600 kilohertz from the input frequency