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Questions tagged [amplitude-modulation]

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1
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1answer
135 views

Why does the carrier wave amplitude have to be largest in amplitude modulation

I don't understand the reason for the following statements in amplitude modulation Here's equation 3-7 described in the text
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6answers
1k views

Why is superheterodyning better than direct conversion?

What is the advantage of having the extra stage of IF, extra local oscillator and extra filtering stage and amplification. It just seems like more work and circuitry. Surely the direct conversion to ...
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0answers
29 views

How to find the Hilbert transform of the complex exponential form of the Fourier series

I am working on amplitude modulation of a signal in the form of the the complex exponent as seen below: I am using the phasing method. To do this I must take the Hilbert transform of the signal in ...
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0answers
74 views

Keyfob decode using GNU Radio Companion

Found this project to decode Hella Keyfobs https://github.com/bastibl/gr-keyfob Try to decode mine, but somehow the signal is way different from the one from the above Repo. From the repo: Mine: ...
1
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0answers
93 views

Amplitude Modulating a simple Laser using an RF transformer

I know I can modulate a laser using an audio transformer see pic and website below. Pen Laser website I was wondering if it’s possible to modulate a simple pen laser using RF signals in the RF range ...
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0answers
42 views

Power of random signal in AM

I'm trying to wrap my head around this problem : I must admit I'm pretty much blocked from the start, at a). I don't understand how I could derive the power of \$s_{AM}\$ given the frequency of the ...
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10answers
7k views

How exactly does AM/FM carry both pitch and loudness of voice?

Almost every tutorial on AM/FM modulation shows the modulating signal as something like a simple tone or continuous sine wave. Now that's easy, and for AM you just superimpose the modulating signal ...
0
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1answer
57 views

How does adding more coils to an AM tuner coil allow it to tune Shortwave?

I have seen several tutorials about how to turn an AM radio into a Shortwave radio. They add more coils to the inductor (is that the correct name for the tuning coil?). Here is one example, https://...
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3answers
152 views

Demodulation of a data

As seen in this picture, I have a circuit that has created those desired pulses in the output. There is a last stage in my circuit and that is: Translating the times that more pulses have happened to "...
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2answers
135 views

High frequency AM demodulation

I'm building an light communication device(pretty much lifi) using AM and am mostly done with every part except for demodulating the signal. The signal looks like with a 1.8432MHz carrier wave(serial ...
0
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1answer
78 views

How does the AM modulated wave cancel out when the signal amplitude exceeds carrier wave amplitude?

In AM modulation, the ratio of signal amplitude to carrier wave amplitude is called modulation index as m. When m>1 i.e when signal amplitude exceeds the carrier wave amplitude the modulated wave ...