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Excellent contribution to the society

Fantastic video, love the teaching style!

Recognitions to Harvey Mudd College, and specifically Prof Jason for this series of SDR lectures. I have learned tremendously from his knowledge sharing. Keep up the good work. Two thumps up! 👍👍 Regards from Malaysia!

Best video on this topic by far!! Thank you very much!

how you write this? what is the screen that yoy used

Awesome videos. I finally understand what a negative frequency is.

Why the sender sends a real sinusoid signal but receive a sinusoid signal with real and imaginary part ?

this is pure gold. thank you, I can't wait to dive back in to RF and signals and aaaaaaaaaaaaaaaaah

Great explanation of Interpolation in the Repeat block, which was not intuitive. Great that Jason pays attention and explains such details. That's what makes these lessons so great.

thank you very much

thank you sir

Didn't have the HD videos? Haha.

Got a question @26min: how can you show a complex signal in Im and Re part as 2 separate signal while only 1 output from the source block? does this mean actually there are 2 signals to achieve complex signal?

Invaluable playlist. "The noblest pleasure is the simple joy of understanding" (Da Vinci) and you definitely brought me joy. Thanks.

Big Aha moment on negative frequencies. I now understand clearly the connection with the Zero IF thing shifting the signal around 0 Hz before sampling by the Analog Digital Converter. The key element to understand is the parity of the cosine and sine functions : cos (x) = cos (-x), and it is therefore not possible to differentiate between a frequency above and below carrier frequency (both positives because real frequencies) in the baseband range, that will turn into a positive and negative frequency (respectively) once shifted and centered around 0 Hz. When applying the cosine function alone to these frequencies, because of the parity of the function, we lose a piece of information about the sign of the frequency, that tells whether it is a few Hertz above or below carrier frequency. The quadrature signal (sine) stores the other half of the information that enables to differentiate lower range frequencies from higher range frequencies, and therefore reconstruct the real signal frequency. Thanks a bunch !

fft size 100 i get this error: Assertion "not (fftsize & (fftsize -1))#The FFT Size should be a power of 2" failed.

I was confused with the analogue way. For example de IF of FM is 10.7Mhz. With SDR there is no IF but the sidebands are direct available after mixing. Is this correct?

Hi Prof Jason thank you again for the lessons , sorry for this question , but i don't understand why do we use the keep in N bloc , In my opinion we are throwing good samples that were behaving themselves .

This channel is the BEST, thank you very much

brilliant!

I dont get something , you say " We are going to throwing out samples that are not in the central region " but from my understanding the decimation happens after the filtration so you are throwing mainly samples of the central region. And therefore the aim of the decimation is just to reduce the sample rate to reduce computation time at the cost of quality . Or did i miss something ?

This is amazing, thank you

Probably the best overall tutorial on how to use GNU Radio around. Learn by doing! Thanks!

Wonderful, thanks. 45 Years ago in 'my' school (when we didn't have these software tools to visualize everything) - it was a lot harder to grasp what is really happening from just the math. You did a great job with the step, by step visualization. :-)

Why, at @20:27 in the demonstration of the Interpolating FIR Filter, did you bypass the throttle block by connecting directly to the signal source when during the other demonstrations you used the throttle block?

Thanks for the tutorial - I have programmed my SDR's in C# and Python, but this tutorial really shortened the learning curve on getting going with GNU Radio. I used this tutorial with my ADALM Pluto with very few changes - running the latest version (Feb 2024) RadioConda on Windows 10. Works great! You have nothing to be sorry for - your 'Live Coding Demo' went better than 99% of the live coding demos that I have done! As we say in R&D: "What could go wrong?" Ha, ha, ha, ha...... ;-)

I cannot give fft size 100

I follow few tutorial and ended noisy audio FM, but from you I got cristal clear audio. thanks bro

I am working with 02 HackRF one and I want to do the same process but no success until now, is there any way to give me a hand ??

amazing videos. Can u please teach how to design gpr to detect crack using pluto SDR

Thank you for all SDR videos. Is there any reason you switched to RTL SDR for this section? Can I use Pluto as well? Is it because the sensitivity, noise figure or other spects of those?

Amazing video. I would highly recommend the DSP teachers to follow this! Prof are you making any tutorials of OFDM signal transmission and reception. It would be very interesting.

Hi, you know what error code 11 means?.

Thanks for the videos! You are a great discovery

Thank you. I always wondered how gas tube lasers worked. I understand the basics of diode lasers but have no familiarity with gas lasers. I guess the next thing I should research is the definition of "mode" in this context, because I'm a layman, with no experience except researching the basics for the two types of lasers I'm using at home: direct diode and diode pumped solid state. Dye lasers are also a mystery to me. It is only the inexpensive lasers I can tinker with, and I haven't really looked into the definition of "mode" because, as far as I'm aware (I could be wrong, admittedly. You're the expert, not me 😊) direct diode lasers are single mode, so I've only really seen the term "mode" mentioned in passing.

Can you demonstrate how clock does not have ISI

How does he write on the board with a mirror direction?

Thank you for the simple, great explanations !

Hello. To contact you, if possible, put your gmail address and I will contact you.. Thank you🙏

Great video. Question: would it be beneficial to use a bandpass filter instead of a low pass one?

Great video professor! Do you know where I can find a link to the 2DFFT applet perhaps?

Why hasn’t anyone used the SDR to derive the ATSC video signal and display it on the screen yet ?

Hi Prof Jason, thank you so much for the lesson. I am not sure why I am able to hear other radio channels, beyond the low pass cutoff frequency (200KHz), is it normal?

Hi. Goog. Thank you.

Dear Prof. Jason Gallicchio, your lectures are excellent and can teach any student in the world the principles of communication and the use of GNU Radio and SDR. I am going through them now and they are simply better than any theoretical course taught in the academy. Your course illustrates the principles of communication to the student. And now I now I wanted to ask you a question regrading this lecture (SDR 15): why does the spectrum appear smooth when the source is deterministic, while when the source is random you see a noisy spectrum? After all, you are not adding white noise to the system. Can I understand that this noisy spectrum emerges due to spectral calculation of random signals of GNU. Every time GNU calculates spectrum, it has partially different signals in the pipeline, so that's why we see these small fluctuations in the spectrum and a not because of digital quantization problems in the calculation?

At 1:11:34 I think it should be a ySin(2wt) term. It's written that way under the gnu block as well, so perhaps I'm mistaken. Anyway, thanks for this excellent video.

Why use a Cosine wave to multiply it with a Complex Exponential?

Please sir any idea of amazing work i can do in my uni (with rtl-sdr and hacrf one) that's project worthy

Dear Jason, I thank you for the information. It has become of great value and entertainment to me. In the QT Instrumentation you can select in the Config tab the control panel to be visible. The Peak Hold or something alike that will help tremendously.

Thank you Prof Jason 🙂