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submitted 5 months ago by knova@infosec.pub to c/amateur_radio@lemmy.radio

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Anyone got any interesting DIY mag loop plans they can share? Or delta loop.

I’d like to try something new and I don’t want to buy one.

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[–] vk6flab@lemmy.radio 2 points 5 months ago* (last edited 5 months ago) (1 children)

A magnetic loop is literally just a loop with a tuning capacitor at the feed point.

There should be several to be found on the ftroop website. ftroop.vk6flab.com

[–] loic_fejoz@mastodon.gougere.fr 1 points 5 months ago

[–] hb9egm@lemmy.radio 1 points 5 months ago

+1 for building instead of buying!

Magloop:

I used the https://miguelvaca.github.io/vk3cpu/magloop.html calculator, using 1inch coaxial cable, and a soviet vacuum capacitor. picture here

Delta loop:

for 6m, horizontal polarisation: feedpoint at the bottom, impedance match with quarter-wave length of 75Ohm TV coaxial cable.
for 30m, vertical polarisation: feedpoint on the side, connected by symmetric line, and a 1:4 current balun.

Sorry I don't find pics for the delta loops. Please ask if you want more details!