HAM FREE Ham Radio Extra Class Questions and Answers 2

Question 1

What is the purpose of a Smith chart in amateur radio?

Accepted Answer

To graphically represent complex impedance and solve transmission line problems

Answer

A Smith chart is a graphical tool used to represent complex impedance and admittance, making it easier to solve transmission line matching problems.

Question 2

Which emission type designator represents a single-sideband suppressed-carrier voice signal?

Accepted Answer

J3E

Answer

J3E is the ITU emission designator for single-sideband suppressed-carrier analog voice transmission.

Question 3

What is the maximum symbol rate permitted for RTTY or data emission on the 20-meter band for Extra class licensees?

Accepted Answer

300 baud

Answer

On the 20-meter band, the maximum symbol rate for RTTY and data emissions is 300 baud per FCC Part 97.

Question 4

What happens to the noise figure of a receiver when a lossy component is placed before the first amplifier stage?

Accepted Answer

The noise figure degrades by approximately the loss of the component

Answer

Any loss before the first amplifier stage directly adds to the receiver's noise figure by approximately the same amount in dB.

Question 5

In a phase-locked loop (PLL) circuit, what is the function of the voltage-controlled oscillator (VCO)?

Accepted Answer

To generate an output frequency that varies with the applied control voltage

Answer

The VCO produces an output signal whose frequency changes in proportion to the DC control voltage applied to it.

HAM - Radio Extra Class Test Practice Test