I didn't want to respond to this thread because I have nothing new to add that I haven't already covered.
konrado I think perhaps you are getting confused as to what is normal.
From memory your graph displayed some dips that across the adsl spectrum would not be considered normal ie there were gaps.
It doesnt display the tail off you would normally expect to see for long lines - thats because your line isnt particularly long. To me it displays signs of some sort of interference. Now I refuse to discuss that again, because over the past few months, several people have advised you what those possible causes could be. You have dismissed every possible cause - and there have been numerous suggestions made. You dismissed local radio hams, but how do you know there isnt one for sure.. Ive seen a case where a taxi CB radio cause similar symptoms to someones line. My own line on adsl2+ had a notch cut out that was supposedly down to maritime frequencies.
What I think you are missing the point on is that because of the way adsl works
it is pretty normal for most lines to see some tones that are affected by something or other. In fact its far more common to see some tones missing or dipped, its rare that there is a straight line decline without some sort of interference or other. It only usually happens on the very short and good lines. Even just normal background noise mush causes peaks and troughs.
Unless you can find a specific cause then you are out of luck... I think even a qualified REIN engineer would tear his hair out trying to diagnose your line & symptoms.. there's too much background noise about irrelevant concerns. We have tried to explain to you many many times all we know and I refuse to keep going round in circles.
If your ISP has notched certain tones then there would be a good reason for it and you wont be able to get it removed. I had a notch at tones 476 - 499 were no bits were loaded. I had to live with it and just be thankful that I had a good line with good performance and a good internet connection.
B*cat has repeatedly shown you his graphs, and how they arent a normal straight line, but the behaviour was normal and it was as good as he is going to get.
We have repeatedly tried to assist you, but you are getting hung up on the wrong aspect of normal. This is why now we feel that we cant help you any further.
We cant give you an answer to something when we dont know what exactly is causing it.