Bloody brilliant Ian ... we must have had the same thing for breakfast (Vegemite on toast?) as I'm working on a very similar project. I'm leaning heavily on the QCX manual that has heaps of info and references. The inductance of the loading coil seems to be "critical" to get max class E efficiency. I'm hoping to get closer to 5W and running QRP. As always thanks heaps for your videos as they are always relevant and interesting. As for the code, I've written my own and have incorporated a simple keyer with all the appropriate timing. My MCU is a Pro Mini ... starting to run out of pins LOL.
@na5y
2 жыл бұрын
Thank you Neville . Like I mentioned I am going to play around with the input impedance of that LPF and see where I can get the output to. I am running about .5 A through the 3 BS170s together right now so there's still some room to go. Glad you enjoyed!
@na5y
2 жыл бұрын
I redid the test using a 30ohm/50ohm impedance LPF drive.google.com/file/d/1chieY_cBfhPB1my2w2B34FxULkMGBY_T/view?usp=sharing Now I get around 3.75 watts output
@Paul_VK3HN
Ай бұрын
Nice work Neville and Ian, two of my favourite QRP homebrewers! 😊 Would be interested to see if your design works higher, say 30, then 20m.
@ricsanders69
2 жыл бұрын
Nice video...always find these design and prototyping radio vids fascinating! 73 de KN4FTT
@na5y
2 жыл бұрын
Glad you enjoyed the video! 73s
@SteveWrightNZ
29 күн бұрын
Hi, trying to build your software for this, getting "invalid conversion from 'int' to 'i2c_port_t'"
@na5y
29 күн бұрын
Its almost definitely an incompatibility between the version of the ESP-IDF you are using and the one I used. IIRC I used ESP-IDF 4.2. Can you try that version?
@SteveWrightNZ
28 күн бұрын
@@na5y I rebuilt it to work on the latest framework... Still ironing it out..
@stevew9945
2 жыл бұрын
why did you use the 7402 buffer? cant the esp32 drive a fet directly? (IOh=40 mA) or was it to get 5V drive?
@na5y
2 жыл бұрын
Its the si5351 that can't drive the FETs directly. Maximum of 8mA I believe on high drive for the si5351. Thats my understanding anyway.
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