Designed for shortwave radios, this RF lowpass filter covers 5–30 MHz to suppress harmonics and out-of-band energy, protecting the receiver and improving signal quality. Key features - Power handling: 100 W rated input for reliable operation during typical amateur and field transmissions. - Thermal performance: Large heat-dissipation area on the PCB delivers efficient cooling and longer service life. - Band selection: Manual tape switch enables quick selection among 80m, 40m, 2017m, and 1510m bands. - Build and compatibility: Compact PCB design with standard RF interfaces for easy integration with existing transceivers and antenna setups. - Practical benefits: Reduces spurious emissions, maintains transmitter integrity, and provides stable performance across the advertised band range. Use scenarios - Home shack: Install in a shortwave setup on 80m or 40m to improve TX cleanliness and protect the front end. - Field or portable operation: Quick band changes via the tape switch to adapt to available bands during DX or emergency communications. - Testing and clubs: Use in a control or service bench to filter multiple bands (5–30 MHz) and evaluate gear performance under realistic transmission conditions. This filter offers a reliable, space-efficient solution with clear band options, solid heat management, and straightforward operation for everyday shortwave use.