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Walter Maxwell wrote:
IMO, Cecil, you've been hoaxed if you thought a coil self-resonant at 6.6 MHz was a high-Q coil at 4 MHz. All I know is that Texas Bugcatcher coils tend to be near the top of the the 75m mobile shootout results. Using base loading on a GMC pickup, it is resonant on 3.8 MHz with a six foot stinger. Remove the stinger and it is self-resonant at 6.6 MHz. My 75m Texas Bugcatcher coil was a gift from K7JEB. It is 26.5 turns at 4 tpi on a 6" air core form. Calculates out to be about 70 uH. I don't know how to make it higher Q. -- 73, Cecil http://www.qsl.net/w5dxp |
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