Software Defined Radio with HackRF by Michael Ossmann, Lesson 11: Replay 

I can’t believe rewatching this after half a decade taught me so much.. again 😊Still can’t wait for lesson 12 - you certainly don’t have to redo the first 11, a recap at most. Thank you! 📡📻

What a wonderful series! Thank you.

Thank you for sharing your knowledge with people in such a comprehensible and elegant way! You're an amazing teacher.

Thanks, really very nice work, a pleasure to watch!

These online lessons have been an excellent addition to the hackrf. I've found them really interesting and easy to follow. Great work Mike thanks again!

What a great video series! High quality educational content for free. Found myself comming back to some of the earlier lessons once I understood more of what I was doing. I had employers pay for expensive workshops that did not transport a fraction of what I was tought in your videos. Hope there will be furhter lessons one day :)

Wow, I followed the 11th lessons, so great! I learnt so much! When will be the 12th lesson ? :)

I cannot express how useful this series has been for me. I'm a total beginner at RF, never been particularly good at math, and you are the first person who was able to make me understand complex numbers. My only issue is that there is no lesson 12. Will there be one? Edit: and ironically I found these videos on another channel

You should have hundreds of thousands of subscribers. GREAT EXPLANATIONS! Thought for sure there were many more radio nerds out there. PLEASE PLEASE PLEASE, keep the great videos coming!

Thank you for your amazing work Waiting for new videos

I have followed each of the first 10 lessons using QT Gui Sink, and just now in lesson 11 did I learn that there was a middle click where all the options were. I kept thinking to myself "why would the dev team get rid of all the options by going to QT?" On those parts when you would tweak a control I didn't have, I just accepted I couldn't do it. Oh well, better late than never.

I just liked all your vids👊

Really like to see more in this series, with decoding the sample and retransmitting the synthesized signal. Be nice to see if it’s possible to do in real time. If the receiver can identify the carrier frequencies being used to center the frequency and implement the filters automatically and then decode the bitstream. Sounds like a fun final for a class. Might have to get my own hackrf or a pair of them.

Any plans to continue the series? Clock Recovery? For example, would love to see the theory and practice of common SDR applications.. like, Morse Code CW Transmission (NFM and AM/USB) and decoding/Receiving (CW Skimmer, CWGet , morsecode scphillips translator, etc) HAM : trunking (SDRTrunk / Unitrunker), digital-modes (DMR, D-Star, System Fusion/C4FM, NXDN, P25/Police Scanner, POCSAG, (YSF? FT8?)) , convert modes on the fly (i..e use DMR radio to talk on C4FM), Decoding/Visualizing Weather Satellite data (noaa-apt, sdrglut)? ADSB Plane Tracking (X-Plane / XHSI and AdsbSCOPE plugin, MultiPSK with Maperitive) GPS Decoding/Plotting/Spoofing ( GNSS-SDRLIB, RTK-NAVI)? ATSC Video Receiver/Transmitter (Portsdown DATV, SDRAngel, GRC)? Local GSM/LTE cellular network (GPRS) (gr-gsm, Kalibrate, IMSI-catcher, srsLTE-Sniffer, rtl-sdr-LTE dedsecimsi, FALCON)? Text/voice decoding (Defcon 2016) Reverse Engineer an RF keyfob ( clock-recovery, analyze protocol (Universal-Radio-Hacker), transmit ) Reverse Engineer Direct Sequence Spread Spectrum If not, do you recommend any of these SDR courses? $2500 Sébastien Dudek? $1500 hackers-arise Subscriber-PRO SDR For Hackers? Balint Seeber / Ettus Research GNU Radio Tutorials ? tonex? enoinstitute ? Georgia Tech Prof. Edu? $15 Udemy (Designing RF Comm Systems using SDRs with GNU Radio, Mastering SDR with GRC, etc), factorialabs? csun skatz CSUN/EAFB Software Defined Radio (SDR) Senior Project? ECE4305? Github SSkySurfer / SDR_Learning ?

I see that the spurs are still present at 55:57 after we implemented the band pass filter. Why didn't the filter remove those?

Is there a way to anticipate poor dynamic range and initially set up Gnu radio to capture a file that is ready to play right after capturing it without further manipulation?

There is something I quite didn't understand. If the Nyquist theorem says that the sample radio should at least be higher than the double of the max frequency why is being used 2M sample when is less than 100MHz? I'm confused.

I need help but the current discord link seems to be invalid, can you generate a new one?

Is there a lessom 12?