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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...

Please help us with our server and bandwidth costs we incur to provide you with the proxy service, Kiwi forum, TDoA (direction finding) and website. Any amount or contribution frequency would be appreciated. Purchase multiple quantities to get the dollar amount you want. Thank you

IMPORTANT NOTICE updated 1 Dec 2025 The USA import charge "de minimis" of USD$800 including freight which allowed items under $800 to enter the US from New Zealand without any fees ended on August 29. The US has also increased the tariff on goods from New Zealand to 15%. The international customs co...

IMPORTANT NOTICE updated 1 Dec 2025 The USA import charge "de minimis" of USD$800 including freight which allowed items under $800 to enter the US from New Zealand without any fees ended on August 29. The US has also increased the tariff on goods from New Zealand to 15%. The international customs co...

We have seen a number of Kiwisdr radios recently 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 KiwisdrThese failures are usually uneconomic to...

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...