Ham Radio General Class Test Station Setup and Equipment

Question 1

What is the primary purpose of an antenna tuner (antenna coupler) in an amateur radio station?

Accepted Answer

To match the transceiver output impedance to the antenna system

Answer

An antenna tuner matches the transceiver's output impedance (typically 50 ohms) to the antenna system to maximize power transfer and minimize SWR.

Question 2

Which instrument is used to measure the standing wave ratio (SWR) in a transmission line?

Accepted Answer

Directional wattmeter or SWR meter

Answer

A directional wattmeter (SWR meter) measures forward and reflected power to calculate SWR on a transmission line.

Question 3

What is the recommended grounding method for an amateur radio station to reduce RF interference and improve safety?

Accepted Answer

Connect all equipment to a single-point ground using the shortest practical conductors

Answer

A single-point ground with short conductors minimizes ground loops and reduces RF current on equipment cases.

Question 4

What type of coaxial cable connector is most commonly used for HF amateur radio equipment in the United States?

Accepted Answer

PL-259 (UHF)

Answer

The PL-259 (SO-239 on the equipment side), commonly called the UHF connector, is the standard for HF amateur radio equipment in the US.

Question 5

What is the function of a low-pass filter installed between a transmitter and the antenna?

Accepted Answer

Reduce harmonic emissions that could cause interference

Answer

A low-pass filter passes HF frequencies while attenuating harmonics above the cutoff frequency, reducing TV and other interference.

Ham Radio General Class Test Practice Test