All Questions
Tagged with frequency radio-frequency
36
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Why does this RLC behavior differ from what equations predict?
In order to better understand RLC behavior under current sources, I constructed the simple circuit below and attempted to analyze it. However, my equations do not agree with simulation results.
The ...
- 309
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33
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Phase-Based Ranging
I've been reading a lot about Phase-Based Ranging (PBR), and it's all starting to become very intuitive.
BUT; There is one technical, but extremely important, detail that seems to escape me. When the ...
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1
answer
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Is there an intuitional way to tell which physical quantities are angular frequency and which are frequency?
Such as the natural linewidth is defined to be angular frequency, while the absolute frequency of laser is frequency.
By far I haven't found a good way not to learn it by roting.
Would anyone be ...
- 31
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37
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Can radio waves with multiple frequencies have the same power?
I was watching data from a spectrum analyzer that shows the frequency of the wave and its power in dBm. I noticed that all frequencies were operating at the same power; however, I don't understand how ...
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Interferometry maximum wavelength for a set of baseline lengths
I am trying to understand phase ambiguity resolution for interferometry. Unfortunately, all I have are old power points and not really any notes or textbooks on the subject.
I have found in a power ...
- 121
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4
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312
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Superposition of EM waves and "magic" behind tuned receiver circuit
I'm struggling to understand how the receiver circuit (eg. FM radio) is able to extract a particular frequency out of the sum of all received frequencies by its antenna?
I've checked dozen of websites,...
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4
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How are sidebands generated in an AM signal?
I can't understand how sidebands get generated, even after reading this wikipedia page: https://en.wikipedia.org/wiki/Sideband#Amplitude_modulation
This is how I picture Amplitude Modulation in its ...
- 127
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1
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86
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Why does amplitude modulated wave take the frequency of a carrier signal when passed through air?
If a message signal of frequency $f_m$ is amplitude modulated with a carrier signal of frequency $f_c$ and radiated through an antenna, the wavelength of the corresponding signal in air is
ans: $\frac{...
- 7,980
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466
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What is the most accurate instrument which can be used to measure frequency of radio waves without measuring wavelength and how accurate is it?
I wanted to know if there's an instrument that accurately measures the frequency of radio waves as I'm working on something and I didn't get anything good on web.
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How does UWB enable much higher positioning accuracies than Narrowband
literature and internet articles often only explain UWB’s much higher positioning accuracies with its much higher bandwidth compared to the bandwidth of other narrowband technologies such as WiFi/...
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Frequency modulation with a certain bandwidth
I came across this sentence in this paper.
Alternatively, we modulate the frequency of the microwave excitation
voltage at 971 Hz with a square wave and a bandwidth of 32MHz.
In my limited FM ...
- 153
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141
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Intuitive explanation of Nyquist rate?
Is there an intuitive way to understand Nyquist rate (i.e., that, in order to prevent loss, an analog signal must be digitized at a rate twice as high as the highest frequency component of the signal)....
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216
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Why is the transmission data rate between Mars and Earth so low?
I read that we get between 500 and 32k bits per second when sending data from Mars to Earth. Apparently it's substantially higher between Moon and Earth. What are the reasons? Please explain the ...
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269
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What is “spectral turnover”?
In a paper which deals with the spectra of radio frequency cosmic events, the word “spectral turnover” is used. What is “spectral turnover”?
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58
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Do terms like 'radiowave', 'ultraviolet', 'X-ray' mean the same thing in matter vs in vacuum/air?
I usually use terms like 'radiowave', 'microwave', 'X-ray', etc. to refer to ranges of electromagnetic (EM) frequencies ($f=2\pi/\omega$) or wavelengths ($\lambda = 2\pi/k$) in air or in a vacuum, ...
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