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More thoughts on the placement of the variable capacitor
- A parallel resonant circuit has fairly large currents sloshing back in forth between the caps and the inductor. Of course in a loop antenna arrangement where we are dealing with microvolts the currents aren't so large, but, any resistance in the path (such as a long thin cable) between the inductor loop and the variable capacitor will reduce the circuit's Q. So an arrangement using a potentiometer by the user and a varactor diode by the loop end is perfect. Regards, Yzordderrex |
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