“Has anyone here tested such QRM Eliminator and explain his/her own experience”
I’m a bit late to the party on this one as it’s quite an old thread, but here’s my two cents worth:-
I have really bad QRM at my location (currently S9+ on 40m & S7 on 20m) although it does drop down to S5 at certain times of the day.
I bought a second hand MFJ-1026 off of eBay in the hope that it would help. It works great for interference on spot frequencies and/or from a specific direction.
For example, my neighbours router used to wipe out 20m on 14 275 whilst leaving the rest of the band untouched. It worked fantastically at getting rid of that.
Unfortunately, most of the interference near me comes from all directions. There are around 5 mobile phone masts that I know of within less than a 1/4 mile radius of my house (probably more that I don’t know about) and I live in a mid-terrace on the edge of an estate, so literally hundreds of routers, power cables, ethernet powerline adapters etc.
It doesn’t manage to do anything about all of that crud. It now sits in the spare room doing nothing as it was more hassle than it was worth.
It depends what sort of noise you have and what you are trying to filter out.
Technology is great, but there is only so much that it can do.