onsite solvent recycling is a thing, what can’t be recycled can be burned for energy. chlorinated solvents require extra energy input because they’re less flammable, and extra corrosion resistance is required in equipment used for that
LEDs themselves are quiet but some SMPSs generate RFI. You can find SMPS that is RF quiet, or since LED strips take so little power, you can make a tiny linear power supply for them, linear power supplies don’t have RF problems
DCM is also about the only good solvent left that is also resistant to lewis acids. I think that some people were pushing for benzotrifluoride as a replacement, but it just straight up doesn’t work as well where i tried it
Tbf before “do it in DCM” was “do it in CCL4” or “do it in benzene”, DCM just works without nuking operator’s liver
Lots of these new green solvents are also annoyingly polar so perhaps they can be used as replacements of other polar solvents but not anything else. I’m not using cyrene, fuck that
TFA is used because it works and is shelf-stable. Replacements like HCl in ether or ethyl acetate are bitch to make and when these can be bought, they have to be refrigerated all the way. Straight up not worth the effort on small scale
that’s illegal (unless you own a zoo basically)
Musk believes in a sort of secular mormonism except instead of magic he has money so he tries to eventually, after millenia to spread his progeny over the entire known universe
You can join from voyager app, and the three instances aren’t listed by default, or so it seems at least
Moxon is very slightly shortened 2el yagi. That other thing is effectively weird phased array of two almost halfwave dipoles, and it’s both worse and bigger, and also harder to make because it requires capacitors for gamma match
BMP-1 also has fuel tanks in doors, not sure how they solved maintenance problem but it’s doable
they’ll just tape 1 in front of display
(Current rabbit hole: Should a HB9CV’s boom be conductive and electrically bonded to its elements?)
Yes it has to be, that’s how you feed its two elements. Boom is at zero electrical potential and forms half of transmission line that goes to gamma matches of both parts of antenna, and you can attach it to perpendicular conductive mast, or extend it for mounting to mast (has to be perpendicular if mast is metal)
Personally, i’d go with 4el yagi if we’re talking portable operation, because boom length is such that you can make it out of plastic tube and hide elements in it when moving around. Or moxon, if size of 4el yagi is prohibitive. Moxon gets you 2db more gain than HB9CV in similar footprint
who is “we”? as of now, there’s still oil being extracted and fertilizer being produced, just a bit less of it. if you live in a western country you don’t have to worry too much about it, except higher prices of food and everything that gets transported. if you’re a subsistence farmer in a place like bangladesh then you’re to some degree fucked
no no, it makes sense. alpha male, so not ready for release and bugs are to be expected
openhamprep explanation is wrong
When you consider a segment of wire, it has some inductance and capacitance in that small segment, and the wider it is, the lower inductance and higher capacitance are. In other words, both X_L and X_C go down as diameter increases. Electric field lines within antenna are mostly perpendicular to wire everywhere except on ends, where they spread in all directions, which means that there’s some residual capacitance there that needs to be charged each cycle. This is called end effect and the wider wire is, the more of it you get. In fact, the same aspect ratio (length/diameter) gets you the same end effect ratio each time, and it’s usually in range of 0.98-0.95. If there’s insulation, then insulation has lower velocity of propagation as it has higher permittivity than air, and it is in place with highest electric field intensity, and this can also shorten necessary wire length a couple %. The more insulation there is, the more shortened antenna becomes. have a calculator: https://www.translatorscafe.com/unit-converter/en-US/calculator/dipole-antenna/
But wait, there’s more. We can think of antenna as a lossy RLC resonator (sort of), where R is Rrad which for halfwave dipole would be 72 ohms, + loss resistance which is smaller, and neither are changing fast with frequency. What is changing faster is X_L and X_C, and the wider wire is, the smaller both of them are (X_L = -X_C at resonance), and this means that you can go further off frequency and still have acceptable SWR, i.e. antenna made with wider wire has more bandwidth, or if we look at it as resonator, lower Q. For HF this means using masts or wire cages instead of single wire, but for VHF this gets more practical
Resistive part of antenna impedance near resonance depends on physical antenna length, and if antenna is shortened, then how it was done, but for the range we’re here it won’t change much. But also it will depend on height above ground, type of soil, antenna geometry and many other things. 72 ohm is in freespace only
you can consider antenna wire as a transmission line, but it will need to include ground as the other side of transmission line, and then impedance is dependent on wire diameter to height over ground ratio. it’s not very useful except when considering very large and currently uncommon types of antennas (beverage antenna and rhombic antenna, both of which are traveling wave antennas). other than that, transmission line interpretation only works when antenna is very close to ground in wavelength terms, and usually it’s way below what you need for radiation to work properly. when it’s way up there, or in free space, there’s another impedance that is specific to wire in free space only and not dependent on length, but it’s not very useful for explanation of anything in antennas
humans start breathing only when 3 years old, don’t you know?
By coincidence, per Zitron, this is also in the ballpark ratio by which chatbots used to be subsidized
and also it’s not the entire problem, just a segment of it (no idea how big it is)
“sharing” also explicitly includes any chatbot interaction, i wonder what consequences this will have
as it is now, edges aligning with grid would be a clue. this doesn’t happen when image looks like static
is equation group prestigious enough “brand” to you?