Pi Pico Ham Transmitter part 2

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Experimenting with efficient polar-modulated switching RF amplifier to boost the output power of the transmitter. Found some issues with spurious emissions and consider some possible solutions.
Documentation: 101-things.readthedocs.io/en/...
Software: github.com/dawsonjon/101Thing...
Class-E amplifier design spreadsheet: web.archive.org/web/202301282...

Опубликовано:

27 янв 2024

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Комментарии : 18

@TestSpaceMonkey 5 месяцев назад

Thanks for this. Always thought it's a good learning exercise to figure out how to engineer around the limitations of a slightly unconventional, imperfect solution.

@101Things-ds8tc 5 месяцев назад

Thanks, that's a great point, very much in the spirit of the project! I have certainly learned a lot exploring the limits of this approach.

@energyideas 2 месяца назад

Thanks for all your work thus far and in the future. I have a Pico reserved for building a transmitter.

@101Things-ds8tc 2 месяца назад

Thanks, really appreciate the kind comment

@phillipneal8194 27 дней назад

Great presentation. Great ideas. Can you extend the series with some filters ? Especially filters using op-amps ?

@101Things-ds8tc 26 дней назад

Thanks, really appreciate the kind comment. I'm always open to new ideas, and gratefully for any suggestions of content you would like to see.

@MegaCadr 5 месяцев назад

This is amazing! Please do more of this! I can't get enough class e / polar modulation content! :) Do you mind sharing the core types you used? And why you chose the transistors you chose? I look forward to seeing more of your experiments!

@101Things-ds8tc 5 месяцев назад

Thanks very much for your comment, glad you are enjoying it. I have added some more details about the transistor selection and the core types on the documentation page 101-things.readthedocs.io/en/latest/ham_transmitter.html#amplifier-experiments

@brickerhaus 5 месяцев назад

This is fantastic. I love seeing someone build a transmitter. Do you have a GitHub? I'd love to run these experiments along side you. I even think something like this could be used to invigorate a younger Ham Radio audience. I also like the idea of pairing this with an SDR. You could have a radio for pretty cheap, and this satisfies all the people out there that say people are just "Appliance Operators." I would like even like to see this as a Bring Your Own Pi Pico kit.

@101Things-ds8tc 5 месяцев назад

Thanks very much for your kind comment. I'm loving your enthusiasm for home-brew equipment! You can find the GitHub page here github.com/dawsonjon/101Things/tree/master/18_transmitter

@GothAlice 5 месяцев назад

Very informative video; thank you! There's a lotta RC going on, there. One minor request; the audio is… a touch painful to listen to. There's some high-frequency noise and static centre-right, and I'm sensitive to those high frequencies. My kingdom for a bandpass filter! 😀 -3.5dB @ 4K, -6dB @ 8K, -12dB @ 16K only *mostly* resolved it for me using a local graphic EQ. Thanks!

@101Things-ds8tc 5 месяцев назад

Thanks very much for your comment. Glad you liked the video. Thanks for the tip about the audio, I'm still getting the hang of things :-)

@startobytes 4 месяца назад

very interesting video but lots of noise on the audio and only 420p Video

@101Things-ds8tc 4 месяца назад

Great, thanks for the feedback! I'm quite new to this, but will try to improve this in future videos. I subscribed to your channel, it looks pretty neat!

@alexgreysukh4875 3 месяца назад

The last link "Class-E amplifier design spreadsheet" is broken. Please update it.

@101Things-ds8tc 3 месяца назад

Sadly the website seems to have disappeared. I have added a link to the web archive instead.

@JRRinMNTX 3 месяца назад

Regarding your PICO RX, It would help it you labeled the orientation of the chips on the pcb. I'm building up this cute receiver...

@101Things-ds8tc 3 месяца назад

Cool, best of luck! With regard to the chip orientation I used the standard kicad symbols, the pin 1 end is marked with a slightly longer line on the silkscreen, but I agree it could be clearer. If you have any problems, raise an issue on the gitHub page and I will do my best to help :-)