OptLowpass 2.03

OptLowpass™ is a software program designed to quickly create transmitter output lowpass filters, particularly for use in the HF amateur radio bands. When you open the program, it will provide you with pre-made filters for each HF amateur band, using ideal parts values as specified in an article. You can also recall a prior design session, open a previously-saved design, or use the Design Wizard. The design page displays a schematic of the filter and a plot of the transmission and reflection responses.

OptLowpass™ is a specialized program written to expedite the design of transmitter output lowpass filters, especially for the HF amateur radio bands.
On startup, the program presents pre-designed lowpass filters for each of the HF amateur bands, using ideal parts values as outlined in the above-mentioned article. You may also recall the last design session, recall a previously-saved design or invoke the Design Wizard.
The design page shows the schematic of the filter as designed and a plot of the responses of that filter (both transmission and reflection).