Amateur Extra E1B: Spurious emissions, protected areas and PRB-1
These are the 11 official questions in group E1B of the 2024–2028 Amateur Extra question pool, with the correct answer marked and a plain-English explanation of why it's right. The real exam asks one question from this group.
Learn E1B step by step, freeRead a short lesson on spurious emissions, protected areas and prb-1, answer these questions as you go, and see why each answer is right.
- E1B01Question 1FCC 97.3
Which of the following constitutes a spurious emission?
- AAn amateur station transmission made without the proper call sign identification
- BA signal transmitted to prevent its detection by any station other than the intended recipient
- CAny transmitted signal that unintentionally interferes with another licensed radio station and whose levels exceed 40 dB below the fundamental power level
- DAn emission outside the signal’s necessary bandwidth that can be reduced or eliminated without affecting the information transmitted Correct
Why: A spurious emission is outside the necessary bandwidth and can be reduced without losing information.
- E1B02Question 2FCC 97.307(f)(2)
Which of the following is an acceptable bandwidth for digital voice or slow-scan TV transmissions made on the HF amateur bands?
- A3 kHz Correct
- B10 kHz
- C15 kHz
- D20 kHz
Why: Digital voice or SSTV on HF should be about 3 kHz wide.
- E1B03Question 3FCC 97.13
Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?
- A1 mile Correct
- B3 miles
- C10 miles
- D30 miles
Why: Amateurs must protect FCC monitoring facilities within 1 mile.
- E1B04Question 4FCC 97.303(b)
What must the control operator of a repeater operating in the 70-centimeter band do if a radiolocation system experiences interference from that repeater?
- AReduce the repeater antenna HAAT (Height Above Average Terrain)
- BFile an FAA NOTAM (Notice to Air Missions) with the repeater system's ERP, call sign, and six-character grid locator
- CCease operation or make changes to the repeater that mitigate the interference Correct
- DAll these choices are correct
Why: The repeater must stop or be changed to fix interference to radiolocation.
- E1B05Question 5FCC 97.3
What is the National Radio Quiet Zone?
- AAn area surrounding the FCC monitoring station in Laurel, Maryland
- BAn area in New Mexico surrounding the White Sands Test Area
- CAn area surrounding the National Radio Astronomy Observatory Correct
- DAn area in Florida surrounding Cape Canaveral
Why: The National Radio Quiet Zone surrounds the National Radio Astronomy Observatory.
- E1B06Question 6FCC 97.15
Which of the following additional rules apply if you are erecting an amateur station antenna structure at a site at or near a public use airport?
- AYou may have to notify the Federal Aviation Administration and register it with the FCC as required by Part 17 of the FCC rules Correct
- BYou may have to enter the height above ground in meters, and the latitude and longitude in degrees, minutes, and seconds on the FAA website
- CYou must file an Environmental Impact Statement with the EPA before construction begins
- DYou must obtain a construction permit from the airport zoning authority per Part 119 of the FAA regulations
Why: Near an airport you may need FAA notification and FCC registration under Part 17.
- E1B07Question 7FCC 97.15
To what type of regulations does PRB-1 apply?
- AHomeowners associations
- BFAA tower height limits
- CState and local zoning Correct
- DUse of wireless devices in vehicles
Why: PRB-1 applies to state and local zoning.
- E1B08Question 8FCC 97.121
What limitations may the FCC place on an amateur station if its signal causes interference to domestic broadcast reception, assuming that the receivers involved are of good engineering design?
- AThe amateur station must cease operation
- BThe amateur station must cease operation on all frequencies below 30 MHz
- CThe amateur station must cease operation on all frequencies above 30 MHz
- DThe amateur station must avoid transmitting during certain hours on frequencies that cause the interference Correct
Why: The FCC can require you to avoid certain hours on the frequencies causing interference.
- E1B09Question 9FCC 97.407
Which amateur stations may be operated under RACES rules?
- AOnly those club stations licensed to Amateur Extra class operators
- BAny FCC-licensed amateur station except a Technician class
- CAny FCC-licensed amateur station certified by the responsible civil defense organization for the area served Correct
- DOnly stations meeting the FCC Part 97 technical standards for operation during an emergency
Why: Any FCC-licensed station certified by the local civil defense organization may operate under RACES.
- E1B10Question 10FCC 97.407
What frequencies are authorized to an amateur station operating under RACES rules?
- AAll amateur service frequencies authorized to the control operator Correct
- BSpecific segments in the amateur service MF, HF, VHF, and UHF bands
- CSpecific local government channels
- DAll these choices are correct
Why: A RACES station may use all frequencies its control operator is licensed for.
- E1B11Question 11FCC 97.15
What does PRB-1 require of state and local regulations affecting amateur radio antenna size and structures?
- ANo limitations may be placed on antenna size or placement
- BReasonable accommodations of amateur radio must be made Correct
- CSuch structures must be permitted when use for emergency communications can be demonstrated
- DSuch structures must be permitted if certified by a registered professional engineer
Why: PRB-1 requires reasonable accommodation of amateur radio.
Learn E1B step by step, freeRead a short lesson on spurious emissions, protected areas and prb-1, answer these questions as you go, and see why each answer is right.