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Switched Coax Stub Filter:

20dB extra attenuation

ARRL Antenna book has a good content on field day stub filters. I created one such filter for additional filtering as required on lower bands. It is made up of a simple control switch with diode matrix, relay switch to bring 40mtr open and short stubs in circuit.

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Note: Stub tuning is still pending to get 25dB + attenuation.

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