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.
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!
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
Only half cooked prawns with Vegemite with a slash of Tomato Sauce counts as proper Ozzie fare. The trick is to digest it before the samonella gets you first. VEgemite on toast as you quote is for soft Pftaha wannabe Crocodile Dundee certified Hero types who go for work 9 to five on the London tube and hope for RF Greatness in a future life. 🙂
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?
Nice demonstration,will be trying the same 👍
Thank you Faizal - good luck with your build!
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.
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!
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
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.
Only half cooked prawns with Vegemite with a slash of Tomato Sauce counts as proper Ozzie fare. The trick is to digest it before the samonella gets you first.
VEgemite on toast as you quote is for soft Pftaha wannabe Crocodile Dundee certified Hero types who go for work 9 to five on the London tube and hope for RF Greatness in a future life. 🙂
Hi, trying to build your software for this, getting "invalid conversion from 'int' to 'i2c_port_t'"
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?
@@na5y I rebuilt it to work on the latest framework... Still ironing it out..
Nice video...always find these design and prototyping radio vids fascinating! 73 de KN4FTT
Glad you enjoyed the video! 73s
why did you use the 7402 buffer? cant the esp32 drive a fet directly? (IOh=40 mA) or was it to get 5V drive?
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.