Check first on a smith chart whether transmission line that you can easily make or get and adjust its length has proper impedance for both source and antenna. The shorter length matching section has, the wider bandwidth you’ll get. There are typically two solutions, of which one is better. Ideally you’d like to have transmission line impedance a bit lower than what would be needed if only transmission line part was used (without stub)

If you want to make a yagi, or mount antenna close to a mast and don’t care particularly hard about extremely uniform coverage, you can modify impedance by changing distance to reflector. If you want to use something like this https://www.wa5vjb.com/yagi-pdf/cheapyagi.pdf then this antenna (radiating element) is already unbalanced and doesn’t need balun that badly

I don’t know if you need common current mode choke like this, it’s probably overkill, popping 3-4 ferrite beads on normal sized coax should be enough. Some people don’t even use it at all and things still work for them. You can also always use folded balun or sleeve balun as a common mode current choke. This toroid is only 20mm in diameter or so, and RG174 has minimum bending radius 6mm, so it’s abused a bit but not that much. It’s probably good for lower bands like 6m too. Alternative is to use a pair of twisted wire in parallel (these have 100 ohm impedance or so, two in parallel are closer to 50) wound on ferrite (more common on HF), and if size restrictions exist, you can use tall and narrow non-split ferrite bead instead of wide and short toroid like this one i’ve used. Also i made it this way because that’s what i had in my drawer. Maybe it was not balun that was narrowband, but radiating element is a limitation instead?

that’s RG174, there’s only 25cm of it or so, so loss is probably not a huge concern (53dB/100m at 400MHz, so 0.13dB), and that common mode choke is probably a bit too much anyway

not much? i don’t have scale but 150g perhaps? i think that if you don’t need it waterproof then you can just extend wires, use them for support and get rid of case entirely. this would require sturdier shorting bar and some spacers probably but would be more compact

it’s 80cm long and can’t be folded, so if that’s portable enough for you, then yes

the point of this antenna is that it has something about 2-3dB gain over dipole, if you don’t need this a lots of smaller antennas with dipole gain exist

e: and also despite what its size could suggest it’s a single band antenna, this one is for 70cm but if you have space for 2m (2.3m long) then i think it still should be practical

nObOdY hAs SeEn NoRtHkOrEaNs https://www.lrt.lt/en/news-in-english/19/2399261/first-north-korean-troops-killed-in-russia-says-lithuanian-source https://www.theguardian.com/world/2024/nov/05/north-korea-troops-russia-ukraine-war-kim-jong-un-putin

mercenaries would be something like wagner. there are international volunteers within normal units of UAF, with normal pay and responsibilities just like any other unit. these chinese were promised unusually high salary and russian citizenship at the end of the contract. ukrainian foreign legion is entirely official, while this chinese recruitment seems to be covert or at least not very highly visibly public. ukrainian foreign legion also takes only people with former combat experience (iirc), it’s unclear so far if chinese recruited have any, probably not considering that china has stayed out of any major war or deployment since forever. these are not the same things

in some cases, on the power of the “fuck that other other guy” school of geopolitics, this can be avoided. https://en.wikipedia.org/wiki/2024_Iran–Pakistan_border_skirmishes “you see, we actually targeted separatists” “yeah we also targeted separatists let’s call it even” it also requires certain degree of diplomatic finesse that trump lacks, and there’s no good reason for strikes in the first place considering that dea coordinated with mexican police (?) previously, so they could just continue doing that

there’s technology transfer from koreans https://www.polska-zbrojna.pl/home/ArticleShow/42536

also not everything can be done with drones, for some time-sensitive targets you need speed that MLRS delivers

there’s not that many of them and one Trident missile costs only $31M

i think there was an update or two since

also the minimum deterrence always kept up by brits is that there’s at all times enough nukes in submarines to destroy moscow. french have some more fine-grained options

triple the defence budget

okay i see now

but what if you put another split ring inside it, it’ll be different

this is just small-ish magloop

i’ve seen some people make magloops out of bike rims, it’s similar sized. the smaller it is the lower radiation resistance, higher currents and voltage on capacitor, narrower bandwidth, and lower efficiency. i don’t remember how it scales but efficiency goes up fast with size, 1m dia magloop is already better. downside is that tuning becomes impossible on higher bands (capacitance required for this is below minimum capacitance of capacitor that you have)

will it antenna? i think it will

split ring resonator has already two different lengths of paths so - even without accounting on how these two interact - you could expect two different frequencies where it’s resonant, with peaks perhaps overlapping to a useful degree making a decently wide band possible. it looks a bit like halo antenna with parasitic, downside being that it’s probably a bit hard to feed it, circumference has to be halfwave on lowest frequency and if made for HF it’d be gigantic

i think it’s more useful to think of magloop as extremely shortened, low impedance, low bandwith halo antenna

i’ll have you know that social contract that formed in russia after 90s looks just like that: citizens fuck off from politics in return for some prosperity. every time when russian state expected that that won’t last due to things like 2008 crisis or covid or what have you, they started a war as a distraction and to rally around the flag some nationalists. now they’re on 4th attempt, this one was due to post-covid recession. difference is, this time they were high on their own supply of propaganda and planned accordingly. they also can’t back down because they see it as a weakness, and that would mean a coup

I know that Abe was PM since always, but he’s dead for almost three years now

Another good example would be actions Brits took in order to protect the fact that Enigma was broken. For example, when Enigma deciphering indicated that there’s warship in a specific area, they would send spotter plane first before attacking it, in order to provide enemy alternative explanation as of how they were discovered. Some operations were aborted entirely for this reason

remember, the entire time until bombs dropped Goldblum wasn’t sure that if it was an elaborate bit