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Why do balun builders always use "enameled" wire?
Why do balun builders always use "enameled" wire? Won't regular electrical insulated copper wire like they sell at Lowes or Home Depot work? Since copper is copper what is the benefit of enameled wire over other types of insulated wire? Also is there a benefit of using solid copper wire over stranded copper wire to build a balun? Michael Rawls KS4HY |
#2
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Why do balun builders always use "enameled" wire?
On 7/5/2011 7:15 AM, Michael wrote:
Why do balun builders always use "enameled" wire? Won't regular electrical insulated copper wire like they sell at Lowes or Home Depot work? Since copper is copper what is the benefit of enameled wire over other types of insulated wire? Also is there a benefit of using solid copper wire over stranded copper wire to build a balun? Michael Rawls KS4HY Because the windings on a balun is not just turns on a core. They are transmission lines of a specific impedance. Wires of a diameter must be a certain distance apart to make a line of of the desired impedance. If the line is supposed to be 50 Ohms they need to be close together, too close for the thick insulation on house wire. Stranded wire is harder to wind on a ferrite core and maintain the spacing that is needed to make a good balun. Just remember that baluns are not transformers in the classic meaning of the term. They are made of sections of transmission lines. For example a 4 to one balun is made of 2 100 Ohm lines that are connected in parallel on one end, 50 Ohms side and in series on the other end for the 200 Ohm side. The common mode impedance keeps one end from seeing the other at RF frequencies. You can not see this with a Ohm meter! John W3JXP |
#3
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Why do balun builders always use "enameled" wire?
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