Learn Amateur Radio!
What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178MHz? A. 7.178 to 7.181 MHzB. 7.178 to 7.184 MHzC. 7.175 to 7.178 MHzD. 7.1765 to 7.1795 MHz LSB, or Lower Side Band, is a transmission mode where all of the transmitted signal exists to the …
Which of these precautions should be taken when installing devices for lightning protection in a coaxial cable feed line? A. Include a parallel bypass switch for each protector so that it can be switched out of the circuit when running high powerB. Include a series switch in the ground line of each protector to prevent …
What is an advantage of Gray code in digital communications where symbols are transmitted as multiple bits A. It increases security B. It has more possible states than simple binary C. It has more resolution than simple binary D. It facilitates error detection Firstly, what the heck is “Gray code” anyway? The reflected binary code …
Which of the following is a characteristic of a Class A amplifier? A. Low standby power B. High Efficiency C. No need for bias D. Low distortion By definition, a Class A amplifier operates on 100% of the input signal. Because of this, they are not particularly efficient or have low standby power. “No need …
Which of the following is a good way to judge whether your uplink power is neither too low nor too high? A. Check your signal strength report in the telemetry data B. Listen for distortion on your downlink signal C. Your signal strength on the downlink should be about the same as the beacon D. …
What is meant by circularly polarized electromagnetic waves? A. Waves with an electric field bent into a circular shape B. Waves with a rotating electric field C. Waves that circle the Earth D. Waves produced by a loop antenna To answer this we need to understand what’s going on inside an electromagnetic (or EM) wave. …
Approximately how long is each side of the reflector element of a quad antenna? A. Slightly less than 1/4 wavelength B. Slightly more than 1/4 wavelength C. Slightly less than 1/2 wavelength D. Slightly more than 1/2 wavelength So lets look at what a “quad antenna” entails. As you might have guessed from the name, …
What is a way to enable quick access to a favorite frequency on your transceiver? A. Enable the CTCSS tones B. Store the frequency in a memory channel C. Disable the CTCSS tones D. Use the scan mode to select the desired frequency Well, here’s the thing. I’m fairly certain since you’re a smart person …
Which of the following HF digital modes uses variable-length coding for bandwidth efficiency? A. RTTYB. PACTORC. MT63D. PSK31 Now, I guess this answers my question about last weeks Extra question. Mainly why is it important. It’s important because it does matter in transmission efficiency. So which mode would be a good and efficient method of …
What are the basic components of virtually all sine wave oscillators? A. An amplifier and a dividerB. A frequency multiplier and a mixerC. A circulator and a filter operating in a feed-forward loopD. A filter and an amplifier operating in a feedback loop To answer this question, lets look at what makes up a sine …