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18 Jul 2020 08:18:49 UTC
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Ensemble RXTX Build #10 - QSE and testing with Simulated I and Q Audio
In this part of the build the QSE is completed and then tested by injected simulated I and Q signals. The output is then observed in the time and frequency domains
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https://www.youtube.com/watch?v=7y2IHwvU5sI
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https://www.youtube.com/watch?v=7y2IHwvU5sI
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I did check the manual and the lower sideband suppression should be -35dB down between 800-2800 Hz. I was only getting that between ~1200-1800Hz. That could certainly be related to the replacement FST3257 I put in. I will check again after the transmit stage is complete.
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I am going to be using a few sources. This is traditional phasing transmitter
http://www.arrl.org/files/file/Technology/tis/info/pdf/9304027.pdf
and this is one built around the Tayloe mixer seen in the receiver
http://www.wb5rvz.org/ensemble_rxtx/index?projectId=14
Specifically this portion
http://www.wb5rvz.org/ensemble_rxtx/09_qse
I will be building both and comparing. In this video I will build up the Audio phasing section. Schematics and board here:
https://github.com/thaaraak/Tinypico-Radio/tree/master/kicad/Transmitter
More on Phasing radios can be found in Chapter 9 of Experimental Methods in RF design
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This is the second part of the ESP32-A1S Radio I started here:
https://www.youtube.com/watch?v=redvZ7LcXT0
The earlier video I did on the arduino audio tools is here:
https://www.youtube.com/watch?v=oqtkR2FRKYI&t=156s
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0:35 Audio Interface on the Board
2:03 Testing the board using the SineWaveGenerator
3:58 A problem discovered with audio output
6:01 Testing Audio Input to Output - and another problem
7:43 Input problem fixed?
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In this video I describe some protection circuitry for ADC pins from this article
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In this video I install the power supply, ESP32-A1S and si5351 and do some testing (and find some problems)
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3:03 PCB Walkthrough
4:03 Quick Note on Scope repair - thanks Siglent (no affiliation of course)
4:23 Board drilled
5:33 Power Supply and programming circuitry done
6:31 First program
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Here's the github repo containing all the code and schematics:
https://github.com/thaaraak/ESP32-A1S-Tayloe
Here's my previous videos on the Tayloe detector board
https://www.youtube.com/watch?v=7t8avIT31Mo&t=146s
Here's the kicad files for the boards
https://github.com/thaaraak/Tayloe-Mixer-v2
Here's my previous video on the si5351
https://www.youtube.com/watch?v=2cb1LLoeT-Y
Here's my fork for the si5351 and LiquidCrystal libraries
https://github.com/thaaraak/Si5351Arduino
https://github.com/thaaraak/LiquidCrystal_I2C
Just download the Bounce2 and Encoder libraries using the Library Manager - I didn't modify those
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0:36 Block diagram walkthrough - Tayloe Detector
1:55 Block diagram walkthrough - ESP32 Processing
4:44 Using the si5351 with code example
6:53 si5351 in action
8:07 Audio Phase Shifting
10:32 Demo of what happens with too many taps
11:43 Schematic walkthrough of the Radio
14:36 Walkthrough of Radio components
15:48 Radio with injected RF at -70 dBm
17:15 Looking at the sideband suppression on the oscilloscope
18:55 Walkthrough of the Radio.ino code
24:30 Finally on the air...
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https://www.youtube.com/watch?v=prCrbD4T6I4
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I had been meaning to create a homebrew version of the si5351 boards that Adafruit and others sell. This is a quick video going through that build
Here's the circuit
https://github.com/thaaraak/si5351
and the code I used to test
https://github.com/thaaraak/ESP32-A1S-Tayloe/blob/master/si5351/si5351.ino
Here are the parts from digikey
https://www.digikey.com/en/products/detail/skyworks-solutions-inc/SI5351A-B-GTR/4069612
https://www.digikey.com/en/products/detail/epson/TSX-3225-25-0000MF20X-AJ3/5260885
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2:09 The board built
2:35 Testing and wrapup
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Quick correction - the si5351 actually outputs 4x the desired frequency into the D type flip-flops. J6 probes after the flip flops. If I probed the input to the flip flops I would actually see something like 56.296 Mhz.
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https://www.youtube.com/watch?v=5IAUlSZVpCo
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Created
3 weeks ago
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video/mp4