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13 Aug 2020 19:03:56 UTC
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QAV500 - Another Soccer Field - near the highway
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VIDEO
ELLIE
ellie-with-smith-wesson-m-p-core-red-dot
M & P Core with Burris Red Dot
...
https://www.youtube.com/watch?v=WPwAN7l3lfs
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Created
1 year ago
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video/mp4
Controlling
VIDEO
ELLIE
ellie-at-the-range-again-with-ppq
...
https://www.youtube.com/watch?v=1wGksIVSqzY
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Created
1 year ago
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video/mp4
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VIDEO
ENSEM
ensemble-rxtx-build-10-qse-and-testing
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
...
https://www.youtube.com/watch?v=7y2IHwvU5sI
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Created
1 year ago
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video/mp4
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VIDEO
IRF51
irf510-amplifier-at-7-mhz
This is a followup to the previous video I did on an IRF510 based amplifier
https://www.youtube.com/watch?v=D4UhOmum_oU
In this video I redo the board for 7MHz output.
The output data measured at both 14 and 7Mhz for a variety of input levels is here
https://drive.google.com/file/d/1tUAI98RJCU1iphPXE7Up22JUtRIgo6A-/view
The code is at this location (IRF510-Amp-Measure.py)
https://github.com/thaaraak/QRPLab10W
Here's the stackoverflow post I read on extracting the AM envelope using python
https://stackoverflow.com/questions/30889748/how-to-obtain-sound-envelope-using-python
0:00 Intro
0:44 Giveaway (board only of course)
1:27 Walkthrough of changes between 7MHz and 14Mhz versions
3:34 Comparison of output at 100mV p-p input
4:11 14 MHz signal
4:44 7Mhz signal
6:10 A quick note on the input data files used by Python
6:48 Python Walkthrough
7:30 Detection of AM Envelope in Python
8:19 Envelope graph display for 7MHz 150mV p-p
9:15 Extracting/Analysing the audio signal from the envelope
10:55 Fourier analysis of Audio
11:43 Analysis with 7MHz signal 60mV p-p input
12:45 Analysis of 14 MHz signal with 80mV p-p input
13:42 Wrap up
...
https://www.youtube.com/watch?v=-7CxDLHUyOM
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Created
1 year ago
Content Type
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video/mp4
English
Controlling
VIDEO
ESP32
esp32-iot-radio-part-5-audio-streaming
In this video I use the ESP32 to create a streaming http audio component.
The code to generate simple WAV files:
https://github.com/thaaraak/Wav-Test
The full audio pipeline http streaming code
https://github.com/thaaraak/ESP32-Streaming-Audio
Description of the WAV format
http://soundfile.sapp.org/doc/WaveFormat/
How to use the HTML5 Audio tag
https://flaviocopes.com/html-audio-tag/
The music
https://www.youtube.com/watch?v=bxqq7fXQd8Y&t=1410s
We Are Magnolia -The Living Will envy The Dead
https://soundcloud.com/wearemagonia/02-we-are-magonia-the-living
0:00 Intro
1:53 The WAV Audio Format
3:40 Simple code to generate WAV files
4:52 Playing the result with aplay
5:14 Seeing the waveform in audacity
6:32 Dynamically generating a WAV and streaming with ESP web server
9:05 Streaming output to the browser
10:29 The HTML Audio tag
12:36 Streaming server integrated with ESP-ADF
15:05 Streaming in action: Phone to ESP32 to Browser
16:42 Wrap up and what's next
...
https://www.youtube.com/watch?v=NWdemILPp3Y
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Created
1 year ago
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video/mp4
English
Controlling
VIDEO
QCX T
qcx-transceiver-part-5-microcontroller
In this video the microcontroller and LCD are installed together with the remaining parts of the Frequency Synthesizer and Quadrature Sampling Detector. The I and Q signals generated from an injected signal are then observed.
Following that the pre-amp is installed completing the receive path and a signal is injected again demonstrating the full receive path (with the exception of the low pass filter)
...
https://www.youtube.com/watch?v=oJMEZfTebgg
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Created
1 year ago
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video/mp4
Controlling
VIDEO
TINYP
tinypico-radio-part-4-phase-shift-and
In this video I will be building the phase shifter. Again the board is up on github in eagle format
https://github.com/thaaraak/Tinypico-Radio
For reference on the phase shifter
- https://qrp-popcorn.blogspot.com/2015/11/that-90-degree-phase-shift.html
- http://www.norcalqrp.org/nc2030.htm
- http://www.norcalqrp.org/files/AustinNC2030Presentation.pdf
Not much with the tinypico in this video. I'll hook it all up next video and see if we can hear anything on the air!
...
https://www.youtube.com/watch?v=819mHab8Frk
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Created
1 year ago
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video/mp4
Controlling
VIDEO
ESP32
esp32-based-sdr-transmitter-part-4
In this video I get the transmitter on the air and test the output in the lab and hear the output using a PA based websdr.org endpoint.
Part 1 - https://www.youtube.com/watch?v=XdupkNW19kA
Part 2 - https://www.youtube.com/watch?v=yNxErsmimLY
Part 3 - https://www.youtube.com/watch?v=sKW8KIhZKHw
LPF board
https://github.com/thaaraak/lpf
RF Tools Filter designer
https://rf-tools.com/lc-filter/
The ltspice file I was using
https://github.com/thaaraak/ltspice/blob/master/bandpass.asc
0:00 Intro
0:59 Designing the filters using rf-tools
2:45 Looking at the lowpass filter in ltspice
4:29 Looking at filter input impedance
6:13 Looking at the filter on the spectrum analyzer
7:34 Looking at a 14 MHz bandpass filter in ltspice
9:07 14 MHz BPF on spectrum analyzer
9:51 A bit of a diversion into toroid winding and the effects...
13:28 Testing setup
15:10 Single tone on oscilloscope
16:05 Two tone test
16:57 Single tone on spectrum analyzer
18:28 Two tone on spectrum analyzer
20:04 Changed to 7 Mhz - confirming that LPF is removing harmonics
21:21 Finally transmitting. Results received by K3FEF websdr endpoint
22:39 Wrap up and next steps
...
https://www.youtube.com/watch?v=raZNgQZ5a-0
Transaction
Created
1 year ago
Content Type
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video/mp4
English
Controlling
VIDEO
QRP L
qrp-labs-50w-amp-part-5-amplifier
In this video I build up the amplifier portion of the circuit, hook it up to the QCX and test the power output.
...
https://www.youtube.com/watch?v=DBkeY792gSU
Transaction
Created
1 year ago
Content Type
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video/mp4