HAM Radio Extra Class MCQ 4

Question 1

What is the meaning of the Q-signal 'QSB' during an HF contact?

Accepted Answer

Your signals are fading

Answer

QSB means 'your signals are fading' and indicates that signal strength is varying due to propagation changes.

Question 2

In a phase-locked loop (PLL) frequency synthesizer, the voltage-controlled oscillator (VCO) output is divided and compared with:

Accepted Answer

A stable reference frequency from a crystal oscillator

Answer

The PLL compares the divided VCO output against a stable crystal reference; the loop filter drives the VCO error toward zero frequency offset.

Question 3

Which propagation mode allows moonbounce (EME) communication?

Accepted Answer

Earth-Moon-Earth reflection of radio waves

Answer

EME uses the Moon as a passive reflector; signals travel ~800,000 km round trip with losses exceeding 250 dB requiring high-gain antennas and sensitive receivers.

Question 4

What is the function of a 'splatter filter' or speech processor in an SSB transmitter?

Accepted Answer

To limit peak audio levels and improve average power, reducing bandwidth splatter on adjacent channels

Answer

A speech processor increases average modulation power and the splatter filter prevents over-modulation peaks from spreading energy into adjacent channels.

Question 5

Under FCC Part 97, which of the following is a legitimate third-party traffic restriction?

Accepted Answer

Third-party traffic is banned with countries that have no third-party agreement with the US

Answer

FCC rules prohibit third-party international traffic with countries that do not have a third-party agreement with the United States.

HAM - Radio Extra Class Test Practice Test

HAM - Radio Extra Class Test Practice Test

HAM Radio Extra Class MCQ 4