🎓 Dr. Freemo 🇳🇱 @freemo@social.cleverlibre.org

@torresjrjr @FreeSoftware Awesome group. can't wait to follow the content!

@Electronics

Finished most of the #ROES prototype board. Never have I been so excited to solder something, specifically the shield. After several years of hard work putting that shield on was a trophy! Its something that has collected dust for periods too and this is the second version I went full cycle on.

For those wondering this is the RF analogy board for an advanced highly percise SWR meter with Network-analyzer like capabilities built into an #Arduino shield. It measures a radio signals forward and reverse properties and compares them including complex impedance, complex reflection coefficient, SWR and much more. with two of them and a zigbee you can even operate one at your transmitter and the other at the antenna end and get both readouts in the shack. Cool stuff!

The yellow shielded wire wasnt working so I added a very tiny red wire instead. The final product wont need this and it may introduce some issues with the prototyping, lets hope not.

If you want to see more pictures of the project, including the GUI demo running or the earlier v1 version just check out the #ROES hashtag.

#electronics #EE #RF #Radio #HamRadio #amateurradio #Science #ElectricalEngineering #Arduino

@Theverytechnologypony Is there a source on this FB close date? This is the first I'm hearing of it and my first instinct is it is just another one of those phony chain letters and has no legitimacy to it at all.

@carrabelloy

I took german in school but it was so long ago I forgot it. Then I moved to the netherlands, tried to learn Dutch, and quickly realized it was much harder than german was (for me). Even now without having studied or spoken german Since I was 14 (and even then not very well) I can understand bits and pieces of what you wrote. Not enough to hold a conversation or fully understand you, but I pick out enough to get an idea.. Words like Arbeit, macht, gut, schwerer, ist, man, auf, ja .. all words I understand (though schwerer i probably wouldnt have remembered if it werent for my dutch as the word is similar there).

@Gargron

@Gargron Had no idea you were german actually. Wunderbar!

@mewmew valid and true. Same for biden supporters sadly though.

@inverness01 Being very important of course. Also helps if you are a person.

@bonifartius This is wildly incorrect and not at all in line with the actual numbers.

Lets start with the weight argument. The average weight of electric cars are 1799 kg, the average weight of cars in general in 2018 was 1841 kg, at least in the USA. No electric cars dont have a whole bunch of extra weight, but its easy to understand why, with an electric car you have batteries, and then one to 4 motors directly attached to each wheel (at least in the favored design of current electric cars). You eliminate a great deal of bulk needed in a traditional car from the engine block to the transmission (sorta), to the drive train, the differentials, a whole bunch of big thick chunks of metal arent there. Yes you also add things like batteries. So in the end the weight is actually very similar.

Also lets address the efficiency issues. This is almost completely untrue outside of a few fringe cases. In terms of the efficiency of the energy stored on board Electric cars are **significantly** more efficient. A petroleum based car has between 19% and 21% efficiency of the energy stored in the gas that actually gets used to drive the car. The vast majority of the energy is lost as heat. However modern electric cars coventry their onboard energy stored in the batteries at 80% efficiency. so if we talk about the cars electric is more efficient by a huge margin.

This makes sense when you consider that each time you convert energy to one form or another there is loss, so a principle of efficient design is direct utilization. gas goes from chemical, to heat/explosive, to linear moment, to angular moment. Each step has significant loss involved. Electric motors however convert the EM of electricity directly into angular momentum, and thus have far less loss and are far more efficient.

Now the only time you can start to argue there is an effiency advantage to gas based cars is when your electrical grid is 100% (or near to it) based off of gasoline or a similarly inefficient power source, in this case you would indeed be correct that start to finish your gas car will have a bit of an edge, however in reality that isnt the case in a single country. The USA is less than 0.1% oil based energy production. The vast majority (for example 75% in new england states) come from a combination of nuclear, hydro, solar, and wind. All of which produce electricity directly and as such an electric vehicle is **significantly** more efficient even when you consider the energy production all the way to the vehicle.

Hydrogen has its use in a few special situations but overall hydrogen tech for cars would be less efficient (significantly so) than electric. There are no nature sources of hydrogen, all hydrogen is produced from non hydrogen sources, for example hydrolysis, which is very inefficient and requires electricity as the input... So instead of running off the electricity directly first you waste half of it converting it into hydrogen, then stick it into a car that uses explosions to turn that into motion which as we already established is very inefficient and wastes another half or more of that energy. So that isnt a solution in most situations, not on its own.