HAM FREE Ham Radio Extra Class General Questions and Answers 2 — Questions and Answers
Question 1: What is the maximum symbol rate permitted for RTTY or data emission on the 20-meter band for Amateur Extra class licensees?
- 300 baud (Correct answer)
- 1200 baud
- 9600 baud
- 19200 baud
Correct answer: 300 baud
FCC Part 97 limits the symbol rate on the 20-meter band (14 MHz) to 300 baud for RTTY and data emissions.
Question 2: Which of the following describes the function of a circulatory in a repeater system?
- It isolates the transmitter and receiver when sharing a single antenna (Correct answer)
- It rotates the polarization of the transmitted signal
- It provides DC power distribution to all repeater components
- It switches between multiple antennas automatically
Correct answer: It isolates the transmitter and receiver when sharing a single antenna
A circulator allows the transmitter and receiver to share one antenna by directing RF energy in only one direction, providing isolation between them.
Question 3: What is the purpose of a Beverage antenna?
- A long-wire receiving antenna for low-frequency directional reception (Correct answer)
- A compact vertical antenna for VHF mobile use
- A broadband transmitting antenna for HF contests
- A phased array for satellite communication
Correct answer: A long-wire receiving antenna for low-frequency directional reception
A Beverage antenna is a long-wire receiving antenna, typically one or more wavelengths long, used for directional low-band reception.
Question 4: What happens to the impedance at the input of a quarter-wave transmission line section that is short-circuited at the far end?
- It appears as an open circuit (Correct answer)
- It appears as a short circuit
- It appears as a pure capacitance
- It appears as a 50-ohm resistance
Correct answer: It appears as an open circuit
A quarter-wave transmission line transforms a short circuit at one end into an open circuit at the other end due to impedance inversion.
Question 5: In the amateur satellite service, what is a linear transponder?
- A device that retransmits a range of received frequencies shifted to another band (Correct answer)
- A repeater that only retransmits FM signals
- An amplifier that boosts the power of a single SSB signal
- A digital processor that decodes and re-encodes signals
Correct answer: A device that retransmits a range of received frequencies shifted to another band
A linear transponder receives a segment of spectrum on one band and retransmits it on another, preserving all signal modes within that passband.
Question 6: What is the primary advantage of using a direct digital synthesizer (DDS) as a VFO?
- Extremely fine frequency resolution and fast switching speed (Correct answer)
- Higher output power than analog oscillators
- Elimination of all spurious signals
- Reduced current consumption compared to crystal oscillators
Correct answer: Extremely fine frequency resolution and fast switching speed
DDS provides very fine frequency steps and can switch frequencies in microseconds, making it ideal for modern transceivers.
HAM FREE Ham Radio Extra Class General Questions and Answers 2
What is the maximum symbol rate permitted for RTTY or data emission on the 20-meter band for Amateur Extra class licensees?