FREE Ham Radio Technician License Questions and Answers
A directional wattmeter can be used to determine which of the following?
A directional wattmeter can be used to determine the Standing Wave Ratio (SWR) of an antenna system.
SWR is a measure of how well an antenna is matched to the transmission line and the transmitter's output impedance. It is defined as the ratio of the maximum voltage (or current) in the standing wave pattern to the minimum voltage (or current). A perfect match would result in an SWR of 1:1, indicating that all the power from the transmitter is being efficiently delivered to the antenna without any reflections or power losses.
How can bias affect the light that an LED emits?
When an LED is forward biased, a positive voltage is applied to the anode (the positive terminal) and a negative voltage to the cathode (the negative terminal). This forward bias creates an electric field that allows current to flow through the LED, which in turn results in the emission of light.
Which HF/MF bands are all amateur frequency privileges available to General class license holders?
Why does a transmitter keying circuit occasionally have a time delay?
A transmitter keying circuit occasionally has a time delay to allow time for transmit-receive changeover operations to complete properly before RF (Radio Frequency) output is allowed. This time delay is implemented to ensure smooth and reliable operation during the transition between transmission and reception modes.
Why is a series diode linked between a solar panel and a storage battery that the panel is using to charge?
The series diode linked between a solar panel and a storage battery that the panel is using to charge serves an important protective function. The diode prevents self-discharge of the battery through the panel during times of low or no illumination. This phenomenon is commonly referred to as "reverse current flow" or "backflow."
If a repeater unintentionally retransmits communications that are forbidden by the FCC, who is responsible?
Explanation:
The control operator of the originating station is responsible if a repeater unintentionally retransmits communications that violate FCC regulations.
The Radio Amateur Civil Emergency Service (RACES) is what, exactly?
Explanation:
Which one of them houses data storage? In times of local, regional, or national civil emergencies, RACES (radio amateur civil emergency service) is a radio service that uses amateur stations for civil defence communications.
What does a "C" appended to the RST report while sending CW mean?
In amateur radio, the RST code is used to report the readability, signal strength, and tone of a received signal during Morse code (CW) communication. The RST code consists of three numbers, each representing a different aspect of the received signal. The "C" appended to the RST report in CW stands for "Chirpy" or "unstable signal."
Which of the following, when compared to other analog voice modes on the HF amateur bands, is a benefit of single sideband use?
The benefit of single sideband (SSB) use, when compared to other analog voice modes on the HF amateur bands, is less bandwidth used and greater power efficiency.
Single sideband is a modulation technique used in radio communications that suppresses one of the sidebands (upper or lower) and the carrier while transmitting. Only the remaining sideband is transmitted, which significantly reduces the occupied bandwidth compared to other analog voice modes like AM (Amplitude Modulation).
By Part 97, which of the following is an example of remote control?
Explanation:
A remote control scenario would be to run the station online.
What, beyond the FCC-established privileges, is a band plan?
Explanation:
A band plan is an optional set of rules for using specific modes or activities within an amateur band, in addition to the rights granted by the FCC.
What limitations apply to the use of procedural signals or abbreviations in the amateur service?
In the amateur radio service, the use of procedural signals or abbreviations is generally allowed, but there are specific limitations that apply to their usage. The primary limitation is that procedural signals or abbreviations should not obscure the meaning of a message. This means that while using these signals or abbreviations is permitted, they should not hinder the understanding of the communication.
Which of the following can be altered to improve a Yagi antenna's forward gain, front-to-back ratio, or SWR bandwidth?
Where may an amateur SSB phone be used above 50 MHz?
Explanation:
All amateur bands above 50 MHz have a portion that is usable for SSB.
How soon can you transmit on amateur radio bands after passing the test for your first amateur radio license?
Explanation:
As soon as your identity and call sign show in the ULS database of the FCC, you are eligible to operate a transmitter on an amateur service frequency after passing the test necessary for your first amateur radio license.
How is broadcasting for the Amateur Radio Service defined by the FCC?
Explanation:
Broadcasting refers to transmissions meant for public reception in the FCC standards for amateur services. Communications intended to be viewed by the general public, either directly or through a relay, are broadcasting.