FCZ coils are popular among Japanese QRPers. Oversea builders quote TOKO mono-band coils often, but these are less common in market. FCZ Lab. prepares all ham band frequency coil in 3 different sizes (5,7,10mm). VXO and other special purpose coil are exist. Detailed specifications are open to public. These are benefit to reproduce homebrew unit by others. The only weakness of the FCZ coil is its price due to their high quality. Each coil cost only 270JPY. When the number of coil increased, they are dominant in your budget. There is no relation between FCZ lab.
