Ham Radio General Class Test Amateur Radio Practices 5 — Questions and Answers
Question 1: What is the purpose of a 'dummy load' (dummy antenna)?
- To radiate a test signal for antenna pattern measurements
- To allow transmitter testing without radiating a signal (Correct answer)
- To match a dipole to a 50-ohm coax cable
- To protect the receiver from strong nearby transmitters
Correct answer: To allow transmitter testing without radiating a signal
A dummy load is a non-radiating resistive load that absorbs transmitter output, allowing testing and adjustment without on-air transmission.
Question 2: Which practice best reduces the chance of RF interference to consumer electronics in your home?
- Operating only on frequencies above 30 MHz
- Using a low-pass filter on the transmitter output (Correct answer)
- Reducing transmitter power to 5 watts or less
- Operating exclusively in digital modes
Correct answer: Using a low-pass filter on the transmitter output
A low-pass filter suppresses harmonics and spurious emissions that are the most common cause of TVI and other consumer electronics interference.
Question 3: What is the meaning of 'de' in a CW contact (e.g., 'W1AW de K4XYZ')?
- Direction of arrival of the signal
- The abbreviation for 'digital emission'
- From — it identifies the sending station (Correct answer)
- The prosign for 'end of message'
Correct answer: From — it identifies the sending station
'De' is a CW abbreviation from French/Latin meaning 'from,' used to identify which station is calling which.
Question 4: What is the primary reason to keep a station log?
- The FCC requires all amateur stations to log every contact
- To maintain a record of operating activity useful for verification and award credit (Correct answer)
- To track antenna SWR readings over time
- To document equipment purchases for tax purposes
Correct answer: To maintain a record of operating activity useful for verification and award credit
While logging is not mandated for most contacts, records help confirm QSOs for awards (DXCC, WAS) and can document interference complaints.
Question 5: What is 'IMD' (intermodulation distortion) in a receiver?
- Interference from power-line noise entering the receiver
- Spurious signals generated when two or more strong signals mix in nonlinear receiver stages (Correct answer)
- Distortion caused by excessive audio volume
- A form of phase noise on the receiver's local oscillator
Correct answer: Spurious signals generated when two or more strong signals mix in nonlinear receiver stages
IMD occurs when strong signals overload a nonlinear stage (like a front-end amplifier), creating new spurious mixing products at other frequencies.
Question 6: What does the Q-code 'QSB' indicate during a contact?
- The operator is busy and cannot respond
- The signal strength is fading (Correct answer)
- The frequency is occupied by another station
- The operator is changing frequency
Correct answer: The signal strength is fading
QSB means signal fading; the other operator is alerting you that your signal (or theirs) is varying in strength.
Question 7: What is the advantage of operating an SSB transceiver in 'split' mode during a DX pileup?
- It doubles the transmitter power output
- It allows the DX station to transmit on one frequency while listening on another to manage the pileup (Correct answer)
- It enables simultaneous voice and digital operation
- It automatically selects the clearest frequency for transmission
Correct answer: It allows the DX station to transmit on one frequency while listening on another to manage the pileup
In split operation, the rare DX station transmits on its frequency but listens on a separate frequency or range, spreading out callers and making the pileup more manageable.
Ham Radio General Class Test Amateur Radio Practices 5
What is the purpose of a 'dummy load' (dummy antenna)?