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Quarter Wave Notch Filter for 41 Meters

To help solve the 41 meter (7300-7500 kHz) shortwave transmitter overload a quarter wave stub has been inserted to help attenuate just that part of the band. More info here.

The filter is wide so there is affects frequencies +/- 10% of the design frequency. The further away from the design frequency, the less the attenuation.

The filter has improved the overload issue and is only a minor inconvenience on the 40 meter ham band.
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