this is not something unusual, it’s like saying “how china’s manufacturing industry fuels microplastic crisis”. it so happens that manufacture of many APIs (active pharmaceutical ingredients, especially generics on account of lower profit margin) got over time outsourced to china and india. what else do you want? cut off entire countries from opioids import? there are legit importers everywhere and it’s that countries’ regulators/customs/etc job to figure it out
if you’re interested in heating only, then geo-solar hybrid might be better for you. the point is that excess heat from solar collector gets stored in soil near borehole, which can be used for heating in winter. solar heat also gets you hot water year round, and it can be made to work with heat pump or without
Shadowban is when you can see your own post/comment but it’s unsearchable or otherwise unreachable by other people. milder variant is comments hidden by default, some of them look like deleted by mod but it might be automatic. the point of shadowban is that you don’t know about it. this is something different, why it happened to you idk but there is some trade in old accounts for spam purposes, maybe that’s why
there is empirical series of materials sorted from which one is most likely to lose vs gain electrons, but what exactly happens is one of unsolved problems in physics
fr this is worse than toilet paper roll math
there are 199 seats and so 2/3 supermajority is 133 seats. tisza has 136 now at 60%ish polling stations counted
at 45% polling stations (?) in, Tisza has 135 seats, which is more than supermajority, and results from bigger cities where opposition has greater support still are not yet counted. if mi hazank drops under 5% threshold, their lead will be greater. lowkey expecting that orban is looking for plane tickets to moscow rn
update: at 72% stations in, Tisza has 138 seats
i think that when locals call a place “the land that god made in anger”, it might be wise to not settle there
lol this is a question that could only be asked on lemmy. read what you want but more importantly practice
dropped as cleanup-only, not allowed by their policies
i suspect that it might be vibecoded, too
join some matrix room that you like and look around for people’s homeservers
i bet they have some preferences about contractor
i was thinking more like, thin external plastic shell and empty cells inside, perhaps with another thin plastic shell on inside, and internal metal shell (on plastic support?) fitting in snugly, for mechanical stability, idk 3dprinting
keeping leads short and nonmagnetic (dramatic reduction in skin layer depth) would be a good thing because of losses, but the longest object in capacitor would be just capacitor plates, and either way in wavelength terms it’s rather small. more precisely you can model it as open transmission line stub with some weird and low impedance, but it’s so small that you don’t have to. you can also make capacitor shorter and wider, or even add more layers like how vacuum variables are made. in nesting design you can get taper effect just by making inner layers longer
Found a piece about RFI and baluns, http://audiosystemsgroup.com/RFI-Ham.pdf multiple turns on ferrite aren’t really an option for VHF and up, ended up ordering extra beads (non-split)
The dielectric between the plates in this case is 0.4mm of ABS plastics (+ a bit of air in the 3d print layer lines).
in terms of losses, PP or PE is a bit better than ABS, teflon or FEP is a bit better than PP, but air is superior to either (this is part of the reason why foam coax is a thing). not sure which ones are printable, or whether it’s practical at this size, but try to introduce as many voids as possible (perhaps requires larger thickness of dielectric). it doesn’t matter much in your case, because of low power (warping of plastic because of excessive heat is probably not a problem). if your coax has solid dielectric, then by introducing enough air in 3d-print your variable might become less lossy than that
The Capacitors allows my 80cm diameter loop to tune from 20Mhz to 37Mhz. Sweeping the whole range is a bit slow due to the low RPM of the motor and takes about 6min. But that is kinda nice when fine adjusting to a frequency.
you have probably noticed that position vs resonant frequency relationship is rather nonlinear. you can get higher sweep speeds at lower end without losing much accuracy at higher end by tapering end of side plates into a triangle shape (it will get longer overall). it doesn’t matter much in your case, because it’s all approx monoband, but if you want to go multiband with this, then it’ll be a nice enhancement. similar effect happens when air variable capacitors have moving plates shaped in such a way that one end is longer than the other, and external edge has shape roughly like a section of logarithmic spiral. precise movement of variables like this is done by use of worm drive with large wheel
I am not sure what is causing this, but i assume it could be due to increase of dielectric losses in the capacitor getting bigger when more of the plates overlap because then the electric field has to flow thru a bigger area of dielectric, increasing the potential for losses.
loss tangent of dielectric is material property, that is ratio of equivalent loss resistance to capacitance should remain constant at given frequency. so i guess that losses should remain roughly the same, if dielectric is to blame, but at any rate lossy capacitor should make bandwidth broader and SWR lower. my guess would be that it’s a matter of coupling loop becoming wrong-sized or wrong-positioned at some point with change in frequency (try moving it up or down? there’s gotta be some optimum position for your entire range of interest)
and i told you before that it’s officers (pilots are generally officers) that will be doing aerial bombing, and because large force on ground is prerequisite for situations you’re describing, it’s not going to happen
i mean that saudis were somewhat restrained about airstrikes, at least publicly, but this action would cause them to not be so. even if they tried, there are extra air defences dragged to saudi for exactly this purpose; every cargo flight and every extra warship makes odds worse for iran, as more missiles would be intercepted, but even if nobody dies, shooting missiles would have diplomatic consequences. another action that would result in rising oil prices would be iran shooting ships in strait of hormuz, but this would also close access to their own single large oil terminal, and there are american warships nearby anyway, so it’s perhaps unwise decision to make today
at this point, i think that decision to strike already has been made, and they’re just stalling so that more metal can come from across the atlantic. dragging an aircraft carrier out there is not done for no reason, and the second one they want to put out there would need to have some of pre-deployment training shortened and done on the way, which is unusual and avoided because there were accidents that this training was supposed to mitigate
must be greenpeace, move along nothing to see here
(also it’s old news atp)