In this video I have the Tiny mounted to a PCB which I created. I have the kicad project files here:
https://github.com/thaaraak/Tinypico-Radio/tree/master/kicad
I have decided to move away from using Eagle and onto Kicad. That change took a bit a pain!
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https://www.youtube.com/watch?v=wyRaee28-6Y
This video is the second part of:
https://www.youtube.com/watch?v=jvmejxsQzn4&t=112s
In this video I do some DSP processing including:
- An echo and repeating echo
- Low and High Pass filters using the CMSIS library
- 0/90 degree phase shift filter
I connect the 0/90 degree audio output to the Tayloe mixer I built in this video:
https://www.youtube.com/watch?v=wBuIS3qCd1k&t=723s
One thing I forgot to mention is that I am injecting the 0 and 90 audio signal after the phase shift network on the board (which is unpopulated)
The filter coefficients were creating using the Iowa hills filter software:
http://www.iowahills.com/
The code is all up on github:
https://github.com/thaaraak/F7-DSP
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https://www.youtube.com/watch?v=gAR2m2_DcXo
This is a quick update from the original 10W Amp video:
https://www.youtube.com/watch?v=wBiz594O5LA
In this video I do a number of measurements varying both the input signal as well as supply voltage and graph the results with Python.
I also add a low pass filter design from this site and remeasure
https://rf-tools.com/lc-filter/
Finally I graph the result of increasing the DC bias to the BS170s
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https://www.youtube.com/watch?v=JMlc5uohcm0
In this video I play around with the LoRa communications protocol using an ESP32 and ESP-IDF
What is LoRa
https://www.semtech.com/lora/what-is-lora
Espressif Hardware Reference
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/hw-reference/
ESP-IDF Getting Started
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/index.html
The Lora32 boards I am using
https://heltec.org/project/wifi-lora-32/
Arduino Code for LoRa
https://github.com/HelTecAutomation/Heltec_ESP32
SX1276 LoRa IC
https://semtech.my.salesforce.com/sfc/p/#E0000000JelG/a/2R0000001Rbr/6EfVZUorrpoKFfvaF_Fkpgp5kzjiNyiAbqcpqh9qSjE
Eclipse ESP-IDF plugin instructions
https://github.com/espressif/idf-eclipse-plugin
ESP-Prog debug board (haven't tried this yet!)
https://www.amazon.com/gp/product/B08P3NM4QS/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
My github repo for the code
https://github.com/thaaraak/Lora
0:00 Intro
0:24 What is LoRa
1:58 ESP32 Hardware
3:07 The Espressif ESP-IDF development framework
4:52 Pinout for the LoRa 32 ESP board
6:24 Closeup of the Board
7:23 Demo of LoRa
8:33 Eclipse and the ESP-IDF plugin
13:26 LoRa code walkthrough (SPI)
18:02 Spreading Factor and Bandwidth
20:10 Setting the LoRa TX power
22:57 Writing a message with LoRa
25:17 Reading a message from LoRa
29:24 The OLED (i2C)
33:15 Off for a drive and a distance check
34:38 Distance results and wrap up
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https://www.youtube.com/watch?v=Gl6FiF01iAE
Just a quick video showing the progress with the workshop. Lots more boxes to unpack and stuff to setup!
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https://www.youtube.com/watch?v=hATkrYNjWtk
This video is a followup from my earlier video on the "70 Watt" amplifier from ebay
https://www.youtube.com/watch?v=JgiakIxMjfI&t=85s
In this video I show a board I had created using the circuit from that amplifier together with some great mods from F5NPV
https://f5npv.wordpress.com/irf530-mosfet-amplifier/
The board schematic and gerber files are here
https://github.com/thaaraak/70W-Amplifier
The bill of materials is here - let me know if you have any questions on the source of any component
https://github.com/thaaraak/70W-Amplifier/blob/main/70W-Amplifier.csv
Here's a link to those ferrite tubes on aliexpress
https://www.aliexpress.com/item/2251832605878483.html?spm=a2g0o.order_list.0.0.36281802yaPJiS&gatewayAdapt=4itemAdapt
I do a shoutout to kitandparts in the video - no affiliation but they are a great source for all your toroid and binocular needs
http://kitsandparts.com
0:00 Intro
0:40 Changes between my board and the original
3:15 Schematic walkthrough of the board
5:38 Walkthrough of the built up board
9:25 Input SWR testing
12:20 Testing CW through the amplifier
13:41 Look at the effectiveness of the LPF
14:34 Two tone test setup
15:12 Two tone on the oscilloscope
17:02 Two tone on the spectrum analyzer
20:46 Replacing the FT50-43 with Ferrite Tube
22:42 Replacing the FT50-43 with BN 43-7150
25:27 Wrap up (I didn't get to testing the RD16HHF1s - more to come)
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https://www.youtube.com/watch?v=GExwAZttFa8
In this video I build a regenerative receiver kit, the Paraset 40 from QRPGuys (unfortunately discontinued)
https://qrpguys.com/para8040set-transceiver
Some historical sites for the Paraset
http://www.sm7ucz.se/Paraset/Paraset_e.htm
https://www.paraset.nl/aa/
Regenerative Receiver Basics
https://www.electronics-notes.com/articles/radio/radio-receivers/regenerative-receiver.php
0:00 Intro
0:51 Radio Modules description
1:10 Transmitter
3:00 Receiver
6:30 Order of construction
8:24 Building/Testing Sidetone generator
10:35 Building/Testing the low pass filter
12:28 Building the transmitter
14:34 Testing the transmitter - and a problem
20:22 Wrap up
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https://www.youtube.com/watch?v=HLBK545heEA