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Magnetic Loops
"rickman" wrote in message ... On 10/19/2015 3:34 AM, Brian Howie wrote: How does the coil affect the tuning range of the cap? A cap is limited by the ratio of the minimum to maximum capacitance. The ratio of frequency is limited to the same ratio. In a multiturn loop you get huge capacitance between turns. For a given variable capacitor it appears in parallel. The Q of that big coil might be higher but as you need to add fixed capacitors to the variable one to get useful tuning range you loose almost what you gain. I saw descriptions using a 128 pairs telephone cable and spending several days to wire it as a 256 turns loop. A bad idea IMHO. |
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