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Welcome to Open Ham Prep! :wave:
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0
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33
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December 13, 2025
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G3C02 - What is meant by the term “critical frequency” at a given incidence angle?
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5
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18
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May 13, 2026
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G4C10 - What could be a symptom caused by a ground loop in your station’s audio connections?
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2
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4
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May 12, 2026
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G7B09 - What determines the frequency of an LC oscillator?
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2
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4
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April 30, 2026
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"Repeater Access Tones" topic doesn't cover related question
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1
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5
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March 15, 2026
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Topic assignment for T6D10
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1
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9
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March 15, 2026
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T9B10 - What is the electrical difference between RG-58 and RG-213 coaxial cable?
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1
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12
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January 25, 2026
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E7B08 - Why are switching amplifiers more efficient than linear amplifiers?
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1
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8
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January 24, 2026
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E8A01 - What technique shows that a square wave is made up of a sine wave and its odd harmonics?
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1
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4
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January 24, 2026
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Release #162! More Accessibility
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8
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January 15, 2026
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Bookmarks not showing consistently in bookmarks view
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1
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5
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January 5, 2026
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How to Elmer at Open Ham Prep
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1
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40
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January 4, 2026
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Links do not render in explanations in the app
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1
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4
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January 3, 2026
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Add organization by ARRL manual
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9
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15
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January 3, 2026
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E2A13 - Which of the following techniques is used by digital satellites to relay messages?
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1
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10
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January 2, 2026
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E6D07 - What is the current that flows in the primary winding of a transformer when there is no load on the secondary winding?
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1
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6
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January 2, 2026
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Figures are missing from questions
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9
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15
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January 2, 2026
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T9B09 - What can cause erratic changes in SWR?
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2
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January 2, 2026
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T9B08 - Which of the following is a source of loss in coaxial feed line?
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0
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January 2, 2026
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T9A12 - What is an advantage of a 5/8 wavelength whip antenna for VHF or UHF mobile service?
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0
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January 2, 2026
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T9A09 - What is the approximate length, in inches, of a half-wavelength 6 meter dipole antenna?
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0
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1
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January 2, 2026
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T9A07 - What is a disadvantage of using a handheld VHF transceiver with a flexible antenna inside a vehicle?
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0
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8
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January 2, 2026
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T8D12 - Which of the following best describes an amateur radio mesh network?
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0
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0
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January 2, 2026
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T8D11 - What is an ARQ transmission system?
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0
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0
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January 2, 2026
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T8D10 - Which of the following operating activities is supported by digital mode software in the WSJT-X software suite?
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0
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1
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January 2, 2026
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T8D07 - Which of the following describes DMR?
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0
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0
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January 2, 2026
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T8D05 - Which of the following is an application of APRS?
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0
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0
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January 2, 2026
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T8D04 - What type of transmission is indicated by the term "NTSC?"
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0
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0
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January 2, 2026
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T8C10 - What is required before using the EchoLink system?
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0
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January 2, 2026
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T8C09 - Which of the following protocols enables an amateur station to transmit through a repeater without using a radio to initiate the transmission?
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0
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0
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January 2, 2026
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