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SDR Protection Circuit V2By Peter Munn ZL2P (Oct 2025)We have seen a number of Kiwisdr radios that have suffered serious damage due to one of the following causes;- Nearby lightning storms- Transmitting into an antenna close the to the Kiwisdr antenna- Accidentally transmitting directly into the Kiw...

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Designed by John Futter ZL2J, this bandstop filter attenuates signals in the MW band 500kHz to 1.5MHz for locations that have very high levels from a nearby broadcast station. It is bandstop, not high pass so the VLF band is unaffected.The circuit is covered in clear heatshrink for physical protecti...