Free Ham Radio Technician General Questions and Answers

Question 1

When transmitting AFSK signals via a radio in single sideband mode, what is likely to happen if the ALC system on the transceiver is not properly configured?

Accepted Answer

Improper action of ALC distorts the signal and can cause spurious emissions

Answer

Explanation:
This statement is partially correct. ALC (Automatic Level Control) is a system in a transceiver that automatically adjusts the gain of the transmitted signal to maintain a constant output power. When transmitting AFSK (Audio Frequency-Shift Keying) signals using single sideband mode, the ALC system needs to be set properly to prevent distortion and spurious emissions. If the ALC system is not set properly, it may result in overdriving the transmitter's power amplifier, causing distortion and spurious emissions that can interfere with other radio signals in the vicinity. Additionally, improper ALC setting can cause the transmitted signal to be too weak or too strong, leading to poor signal quality and potentially disrupting communications.

Question 2

What should you do as soon as you hear a difficult station break in while conversing with another amateur station?

Accepted Answer

Acknowledge the station in distress and determine what assistance may be needed

Answer

Explanation:
When communicating with another amateur station and hear a station in distress break in, the first thing you should do is to acknowledge the station in distress and determine what assistance may be needed. It's important to remain calm and professional in such situations and follow established emergency protocols.

Question 3

How does the receiving station react to an error-filled packet in ARQ data mode?

Accepted Answer

It requests the packet be retransmitted

Answer

Explanation:
When a receiving station receives an ARQ (Automatic Repeat Request) data mode packet containing errors, it sends a request for the packet to be retransmitted. This is because ARQ is a protocol used to ensure error-free data transmission over a noisy channel, and it uses acknowledgements and retransmissions to achieve this goal. When the receiving station detects errors in a packet, it sends a negative acknowledgement (NACK) to the transmitting station, which then retransmits the packet until it is received without errors or the maximum number of retransmission attempts is reached.

Question 4

When memory is described as non-volatile, what does that mean?

Accepted Answer

The stored information is maintained even if power is removed

Answer

Explanation:
Non-volatile memory is a type of computer memory that can retain stored information even when not powered, unlike volatile memory which requires a power source to retain data. Examples of non-volatile memory include ROM, flash memory, and hard disk drives.

Question 5

How is an RF power amplifier's effectiveness assessed?

Accepted Answer

Divide the RF output power by the DC input power

Answer

Explanation:
The efficiency of an RF power amplifier is determined by dividing the RF output power by the total DC input power. This includes both the power consumed by the amplifier itself and any power lost due to inefficiencies in the power supply or other components. Efficiency is an important consideration in designing power amplifiers, as high efficiency allows more of the input power to be converted into useful RF output power, reducing wasted power and improving overall system performance.

Ham Radio Technician Test Practice Test

Ham Radio Technician Test Practice Test

Free Ham Radio Technician General Questions and Answers