Super Simple Breadboard-SDR Receiver from 50 kHz to 30 MHz
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- čas přidán 29. 06. 2024
- A shortwave SDR receiver using a Tayloe Quadrature Detector. Costs less than $15 and can be built with few parts on a breadboard or a PCB.
Get your PCB from PCBWay: www.pcbway.com/?from=Doctor%2...
All you need to replicate: github.com/michalin/easysdr
Quisk SDR software: james.ahlstrom.name/quisk/
Paper on Tayloe Quadrature Mixer: www.norcalqrp.org/files/Taylo...
Recommended USB soundcard:
USB Audio Adapter, 96 kHz/24-Bit Hi-Fi: amzn.to/3tLdLtU
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00:00 - Introduction
00:20 - What is software defined radio, how does it work?
01:20 - Mirror frequency problem
01:53 - Quadrature demodulation
03:12 - The Tayloe Quadrature Detector
06:18 - Quisk SDR software
08:01 - First tests
09:25 - Building on PCB
10:34 - Clock generator Si5351
11:32 - Chasing for waves
#electronic
#electronicscreators
#radio
#hamradio - Věda a technologie
Very interesting. Thanks for sharing.
I've heard of other quadrature detectors similar in operation, but this is very interesting. SDR is quite fun indeed, thank you for your awesome videos
Cool! I bet having a better filter at the input (per ranges of frequencies) and some RF preamps would make this an excellent receiver.
Dear Dr.V. This was an excellent presentation. You condensed scores of articles into a clear, concise, explanation (with excellent real-time graphics.)
This double signal is most likely RTTY of some type. You can observe and decode/encode a multitude of modes (including Morse) using a shareware copy of MULTIPSK.
thx
Simply awesome. Your didatics are also very good! Thanks!
The two peaks slightly apart might be an RTTY signal. The german weather service has a few frequencies they transmit RTTY signals at.
Very interesting and informative, thank you!. A few years ago, I experimented with something similar - a homemade Tayloe detector, soundcard, etc. and made a rudimentary SDR receiver. HDSDR was the software for it. Although that was a very good learning experience, I quickly began to see that my little receiver had many shortcomings to correct before it could become an actually useful piece of equipment and that I was reinventing the wheel. And so I set it aside and bought an SDRPlay RSPdx receiver. But I wouldn't trade that time and effort for anything else because it gave me a much better understanding of how these things function :).
For Morse, you can look at the audio in some sort of audio editing software, then it's easy to see the dots and dashes and decode it manually
Maybe this can also be made by some software in realtime...
There's also apps for smartphones that decode morse.
Nice project 👌 keep up
Amazing. Thanks a lot
Great video 👍
Very nice
very cool!
muchas gracias!!!
Muy muy buen trabajo!!!!
De nada 😊
There are many different modulations for radio broadcasts, when the waterfall is moving quickly from left to right and visa versa is might be FM or frequency shift keying, when it sounds like bidibididibidiidi it could be a signal for very simple data transmissions, when is sounds like grgrgrgrgrgrgrgrgrgrggr it probably is a digital signal. When it sounds like beep beep beeeep beep beeep then those signals are remnants of ancient communication between dinosaurs, they are still echoing around.
That HP fellow who has invented the software defined radio must have been a very clever bastard. Who could come up with the idea to shift something 90°?
Nice! I want to build somthing similar myself but had some problems with the IQ mixing. Also im not sure if i just make the baseband analog and feed it to my pc, since it has more processing power and a 16bit soundcard. Also the soundcard can be used with almost all SDR tools without additional drivers. Anyway thank you for the inspiration if my concept fails i try it your way.
The first CW station gave a signal report of 599 (5NN) followed by 'thank you' (TU).Tthe other station then replied with an italian callsign IX1... something (could not read it completely because you where talking over it)
For the ADC, the samplerate must be more than twice the signalrate, say nyquist.
Nyquist Shannon sampling theorem states that it’s what is needed to make a perfect representation of the sampled data.
Great video. Very informative. How did you set up your scope to see the 4 quadrature components "rolling"?
Hey Dr.V will you send me the link of the PCB that you used in this video? I need this PCB to make my own SDR circuit for my Radio telescope building college project. I hope you will send the link for this PCB.
sure: github.com/michalin/easysdr/tree/main/schematic/gerber Send these files to any PCB maker of your choice.
@@DoctorVolt thanks you so much for the help, so i just save the complete Gerber file on GitHub and send it to PCB manufacturer?
Thank you so much @@DoctorVolt
🤩🤩🤩👍👍👍
So that's neat...but I can't say I'd want to listen to music at that quality, haha. Where do you think the quality loss occurs? Are the transmitted signals far, weak, and noisy? Is it some flaw of the chips? The board? The fundamental design of the receiver?
AM in general has bad quality, because the audio bandwith is limited to 4.5 Kilohertz. Then there is fading and interference from other stations or appliances. And last I think that the circuit I was using there adds a lot of distortion.
@@DoctorVolt Thanks - do you know what aspect of the circuit causes the distortion, and how to improve it?
Does the ESP32 S3 have any advantage in performance over the already EOL original ESP32?
Or maybe the specs that matter are the same?
I found that the S3 is a bit faster than the classic ESP32. I estimate around 20% or so. I think this is due to its more efficient Xtensa LX 7 core.
Very good video! Unfortunately, it's not easy for me to find the multiplexer. But still... great video!
I got it from Digikey
That was the first place I looked! They do have a lot of multiplexers with 3253 in the part number, but I'm not finding a perfect match. I suspect there is some leeway here.
Hi nice video . Is it possible to buy Your designed PCB from PCBWAY ? Or this project is shared on the page ?
No, but you can upload the gerber files from my Github and order them from there.
Thank U . 73! @@DoctorVolt
That last one looked similar to NOAA weather data transmission
Hello, can you name the music playing in the very first secons of the video? It's quite interesting.
Unfortunately not. It's some random shortwave station I picked up with the SDR that I show in the video.
cant we use mic input for this ? i have a laptop and i dont have a line-in port... also "cheap chinese" external audio capture devices are very expensive in here...
so.. is there any hope for me??
Thanks!
Yes, you can. But in this case, you will see all the stations twice on either side of the waterfall. Also the sensitivity is less.
@@DoctorVolt there are op-amps in the circuit, wouldn't it be too high for mic input voltage?
Thanks!
@@Sultan___ No, that's ok. Output volstage of the opamps is below 1V. You can also put a capacitor of around 1 microfarad to get rid of the DC bias. But for me it works even without.
I bet gnu-radio has your DRM decoder properly written and tested.