FREE Ham Radio Extra Class MCQ Questions and Answers Flashcards
6 cards from real HAM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 FREE Ham Radio Extra Class MCQ Questions and Answers flashcards as text
What is the purpose of a Smith chart in amateur radio?
Answer: To display complex impedance and admittance on a single graph
A Smith chart graphically represents complex impedance and admittance, making it easier to design matching networks and analyze transmission line behavior.
Which emission type designator indicates a single-sideband suppressed-carrier voice signal?
Answer: J3E
J3E designates a single-sideband suppressed-carrier analog voice emission in the ITU emission designator system.
What is the maximum symbol rate permitted for RTTY or data emission on the 20-meter band?
Answer: 300 baud
FCC Part 97 limits the symbol rate for RTTY and data emissions on the 20-meter band to 300 baud for Extra class licensees.
What is the typical noise figure of a well-designed preamplifier for weak-signal VHF work?
Answer: Less than 1 dB
A high-quality VHF preamplifier for weak-signal work typically achieves a noise figure below 1 dB to maximize receiver sensitivity.
In a superheterodyne receiver, what causes an image frequency response?
Answer: A signal at twice the IF frequency away from the desired signal mixing to the same IF
An image frequency is separated from the desired signal by twice the IF, and it mixes with the local oscillator to produce the same IF output.
What is the function of a directional coupler in a transmitter system?
Answer: To sample forward and reflected power without interrupting the transmission line
A directional coupler samples a small portion of forward and reflected power on a transmission line for measurement purposes without significantly affecting the main signal.