- Purpose and problem solved This filter primarily suppresses broadcast FM interference to protect shortwave reception and improve performance on other bands in FM crowded environments. - Design note The notch is relatively deep and may also affect aviation frequency ranges; plan installation accordingly. - Stop band and performance It suppresses 88 to 108 MHz with an attenuation of about 50 dB or more in the stop band. - Practical benefits for R The broadcast FM band stop filter is very useful for use with R, as strong broadcast FM in some areas can cause receiver overload and degrade performance on other frequency bands. - Use scenarios 1) Enhancing shortwave listening in urban or FM-dense areas by reducing FM interference. 2) Use with radio receivers (R) in locations with strong local FM signals to prevent overload and improve overall band performance. 3) RF measurement or test setups where isolating from FM broadcast interference is required to obtain accurate results.