Monthly Archives: March 2015

HI-PER-MITE CW Filter

HI-PER-MITE An Active Audio CW Filter The 4 States QRP Group (http://www.4sqrp.com/index.php) put out many very goods kits and one of them is the Hi-Per-Mite active audio CW filter. I purchased the kit a few weeks ago after seeing some … Continue reading

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