🎓 Doc Freemo 🇳🇱 @freemo@qoto.org

Never saw a Mag-loop style antenna used on a handie-talkie before, but I really dig it! I may need to try this!

#radio #RF #Ham #HamRadio #Electronics #EE

Woot my HF antenna is once again live. Sadly my main hf rig still need ofrepair but i was able to pull out an older rig. I am now transmitting at full 1500watts again! Lightening 0 Jeff 1

#hamradio #radio #electronics #ee

So did some more investigating the damage at my AM Shack here... At a minimum my unun connected to my antenna is fried, as well as my TS-990 transmitter, also fried. I ordered a new unun and will have that installed next week.

Luckily all my VHF/UHF band equipment is fully operational though! So at least I will be on the air locally.

#Ham #HamRadio #AmaetureRadio #RF #Radio

I have started working on my ROES SWR meter again. Hope to finish the v2 of the project in the next week and get some PCBs printed.

This has been int he making a long time now. Always wanted a super high-tech SWR meter.

#HAM #Engineering #RF #HamRadio #RF #EE #Science #Electronics #Arduino #AVR

I feel like its time to upgrade the Transmission Line I use in my shake... Overkill?

https://www.reddit.com/r/nextfuckinglevel/comments/fk1fpo/demonstrating_a_24kv_underground_line_splice/

#ham #HamRadio #AmateureRadio #Radio #RF #Science #Engineering #ElectricalEngineering #EE

I wanted to kick off the #QotoJournal hashtag by sharing a free open-source book I started writing some time ago...

I started writing a book in an attempt to help explain how to do circuit analysis by hand. Originally it was going to include both time-domain analysis as well as frequency-domain analysis. The book is incomplete and I never got to cover the time-domain but has several complete examples showing frequency-domain analysis on many common circuits. I’ve gotten some compliments over the years, particularly from HAM radio operators, on how useful the book has been to them. I’d like to share here what I have so far in case anyone might find it useful.

As a side note if anyone would like to revive the project and work with me on expanding and completing the book it would be most welcome. Please feel free to contact me. In the meantime here is the compiled book in its current form. I don’t currently have the latex source code published anywhere but if there is any interest I will happily publish it and open-source it on github.

Here is a direct link to the book: https://discourse.qoto.org/uploads/short-url/tFY6qFBUnmFFVdnBErQ8mJdZuBF.pdf

You can also view the book as a feed in my blog here: http://jeffreyfreeman.me/frequency-domain-circuit-analysis-tutorial/

If you wish to comment or discuss it there is a discourse post for it here: https://discourse.qoto.org/t/frequency-domain-circuit-analysis-tutorial/41

#ElectricalEngineering #Electronics #Science #HamRadio #Radio #RF #math #mathematics

Apparently MUF is around 20 Mhz right now. Not horrible for a solar minimum.

#Science #HamRadio #Radio

Oh shit, an earth directed Solar Storm ejecting in our direction! Looks like there is some Solar Weather news this week!

https://youtu.be/HKqDr7GKcxQ

#ham #hamradio #radio #rf #space #spaceweather #science

If you like pretty colors, lots of graphs, and astronomy, check this out: https://www.solarham.net/

#science #astronomy #space #ham #hamradio

Kina excited, my Protowaffle project is in the process of making its first Sale to an electronics retailer. Just waiting to hear how many they will buy. Lets hope it is a big sale

Also still offering free samples If anyone wants some free samples let me know, here is some info on it: http://protowaffle.com

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #hamradio

Recently uploaded a copy of a book I was writing to help teach RF/AC circuit analysis. I never did finish it but the first few chapters I wrote has some really useful explanations. Anyone trying to learn electronics should take a look.

https://discourse.qoto.org/t/frequency-domain-circuit-analysis-tutorial/41

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #hamradio #Discourse

Now that the #QOTO Discourse server is fully working, including the math rendering, I can start adding some content to it.

For my first post I wanted to share a tutorial I wrote on how to do frequency-domain nodal analysis on electronic circuits.

Here is the link:

https://discourse.qoto.org/t/nodal-analysis-tutorial/36

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #hamradio #Mathemathics #Math #Maths

If anyone wants one of my protoboards for free to try out don't forget to send me a message. Here is the original post:

https://qoto.org/@freemo/102467854068623471

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #hamradio

I just finished a first draft of my Protowaffle Datasheet (electronics prototyping board for surface mount). I could really use any feedback before I go live with this.

https://git.qoto.org/protowaffle/protowaffle-one-datasheet/-/jobs/206/artifacts/file/ProtowaffleOneDatasheet.pdf

#OSS #opensource #Science #STEM #RF #EE #Electronics #Engineering #ElectricalEngineering #RFEngineering #HAM #hamradio

Sneak preview of the Protowaffle website my buddy luuk us working on. I love the colors.

Feedback, ideas, al welcome!

#OSS #opensource #Science #STEM #RF #EE #Electronics #Engineering #ElectricalEngineering #RFEngineering #HAM #hamradio

So I recently got a few thousand boards printed up for my protoboard design. Tested them on a few circuits and im amazed how well they work. I'm writing the datasheet now and we will begin selling on digikey, mouser, and many other big names soon.

In the meantime any EE people out there want a free board? We are going to hand out a few hundred for free to get people interested.

Here are some past posts I made about it for some background info. I've also attached an image of the final boards.

https://qoto.org/@freemo/101518455796695415

https://qoto.org/@freemo/101517564046276857

https://qoto.org/@freemo/101471853619646546

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #hamradio

An image showing how the protoboard I designed is laid out as well as a picture of the printed board and my Frequency Counter design soldered to it as an example. I also attached the schematic for reference.

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #hamradio

The first draft of the PCB protoboard I designed arrived. It is more beautiful than I could have imagined.

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #hamradio

The latest version of my frequency counter prototype using a Manhattan style construction.

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #hamradio

There is a sort of beauty in the order and chaos of a prototype design.

Just finished soldering together this frequency counter frontend.

#RF #EE #Electronics #Engineering #Science #ElectricalEngineering #RFEngineering #HAM #hamradio