http://educypedia.karadimov.info/library/slinky8.pdf
My copy is a little smaller with a 70cm loop made from 19mm.PVC. It has 650 turns 1.5mm PVC isolated electrical wire .Coil value is 134.6 uH. There is no need for a tuning capacitor and the feedpoint has a low Z . Power handling is easy 100 Watts and the recieved signals have a verry low noise levell. This antenna radiates like a dipole , that makes it perfect for window use. I could make clean and loud contacts throughout Europe on my first attempt having bad conditions. At the feedpoint is a line choke made of a ferrite rod with 15 turns RG-58 , giving about 1000 Ohms at 20m. SWR is 1.7 ( 83 Ohm X=0 ) at 14.200MHz with a sharp second resonance at 37.485MHz .( 50 Ohm X=3 )This little Russian is a big performer an will stay at my apartment window for shure HI
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| The effective line choke |
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| First results with bad conditions |