here are the dimensions for the bobbins. Only a ferrite ec120 will give the proper area for all three coils. secondary is twice as large as choke cavity due to the 4x inductance of perfectly coupled inductances.
L total Ls= L1 + L2 +2M which, when the bifilar coils are connected properly is the equivalent of 4 times the inductance of a single choke value. Since the secondary coils are monofilament they effectively contain 4 times the amount of wire as one choke coil, except for the mean diameter, so they are close in inductance values thanks to the bifilar setup. also the fact that the bifilar chokes are physically closer to the ferrite core than the secondarys may also help in the two sections matching inductively?
anyway here are some drawings that were based on recent photos of an actual disassembled Meyers VIC!
L total Ls= L1 + L2 +2M which, when the bifilar coils are connected properly is the equivalent of 4 times the inductance of a single choke value. Since the secondary coils are monofilament they effectively contain 4 times the amount of wire as one choke coil, except for the mean diameter, so they are close in inductance values thanks to the bifilar setup. also the fact that the bifilar chokes are physically closer to the ferrite core than the secondarys may also help in the two sections matching inductively?
anyway here are some drawings that were based on recent photos of an actual disassembled Meyers VIC!
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