My design for 430-440mhz use (70cm orientated to cover up to hotspot/gateway digital use segs as much as TG/SSB) uses 3cm section diameter tubing (made of copper sheet I bent into tube sections) with not horrible overall bulkiness. ![]() Just keep in mind, when constructing, once in VHF upwards (especially at UHF upwards) everything you use material wise has notable distinct parasitic potential to start being reflective and absorb notably EM wise and you’ll find that BW becomes much narrower, relative to a proportional relationship between loop section diameter and loop diameter itself, as does the material etc.Īt VHF upwards, I found good results moving away from wire and using large diameter section tubular construction for the loop itself – everything BW wise gets narrower for a resonance when you get into VHF/UHF/SHF RF (as HF people view it, dark magic territory still to this day). Hell, with C#, you can knock out the equivalent covering a wider range quite easily. ![]() ![]() As for the HF orientated range it covers, fair play as most who’d download it want a mag loop (STL for either/dual use) will be looking at a fixed segment HF size design or will take it to the next step as a tunable variant.Īs for upwards of 30mhz, well, any good reference on antennas will give you the formula chain required, just about as easy to knock up in a spreadsheet or as a type-in/output result CLI program in C/Basic/*insert preferred language* interpreted or as a compiled standalone exe.
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