Cb Ham Radio 3000 watt RF LIMITED DF3000 3KW Low Pass Tvi Rf Filter 1.8-30 Mhz

This unit is well-built and reduced, but didn't completely eliminate the feedback RFI that energized my car's speakers. It is also good to know that I am probably not causing any TVI.

exactly what i wanted

great filter

Cheap Nothing Inside ... Cheap

Always a great deal

Terrible filter topology. The rejection is non-existent at any other frequency other than 60 MHz (which is the 2nd harmonic of the 29.7MHz amateur band). By the way, I'm 100% sure of the DF3000 plot, as I have tested nearly a dozen of these.There are tons of other quality filters you can buy, that are truly low pass and have >70dB rejection at both 2nd harmonic, as well as the 3rd, 4th etc...The red curve in the attached plot is a high quality Kenwood LF-30A, but there are many other manufacturers that have great S21(dB) transmision response. DF3000 barely has any rejection at the 3rd harmonic.