this post was submitted on 26 Mar 2025
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Science Memes

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47
If u use a SWR meter u vibe checking ur antenna (sh.itjust.works)
submitted 6 days ago by [email protected] to c/[email protected]
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[–] [email protected] 2 points 5 days ago* (last edited 5 days ago) (2 children)

i found a calculator for split rings and one with a outer diameter of 66cm and a trace width of 60mm would resonate at 27MHz and needs about 14pF of capacitance on the split of the gap

[–] [email protected] 2 points 5 days ago* (last edited 5 days ago)

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)

[–] [email protected] 1 points 5 days ago (1 children)

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

[–] [email protected] 1 points 5 days ago (1 children)

i could be wrong but i think the calculator already includes the inner ring https://srrcalculator.blogspot.com/p/calculator.html

[–] [email protected] 1 points 5 days ago

okay i see now