What is a Roofing Filter?
11/25/24, 08:33 PM. Filed in:
Video | Radio TechnologyOn a recent club net, one of the stations checking in, asked about roofing filters. The roofing filter in a radio is the filter through which the first IF must pass. According to
Elecraft, the term "roofing filter" has most often been used in relation to triple- or quadruple-conversion receivers. Such receivers have an IF above the highest RF band covered; it's typically something in the range of 30 to 70 MHz or higher. But "roofing" as a term should be interpreted as "protective," not "high in frequency." A roofing filter protects later stages, including amplifiers, mixers, narrower filters, and DSP subsystems, just as the roof on your house keeps rain out of all of the rooms.
Roofing Filters in ContextA YouTube video discussing adding a roofing filter to enhance CW operation:
https://youtu.be/CIRJqBGRCUI?si=1l8_pj6VfnoSKcSiDemo of roofing filter on 20 meters:
https://youtu.be/mKnoxmjNstI?si=ef7yik0zRg_touabA YouTube video about installing a roofing filter in a Yaesu radio:
https://youtu.be/5Af9Je-JrNw?si=pnyGyU0wKToQGcWHHere's another video about the difference between roofing filter and DSP filter:
https://youtu.be/_FRkpfGh7Ik?si=g6LTjqKtFgmMhSRR