[RFI] New noise wiping out 160m

[Thomas Hoyer]

I normally have S5-S7 noise on 160m but recently I now have +20dB noise that seems to cycle at approx 2.5 minute on/off cycles. I was not active on 160 in December but it wasn't there in Nov and I just noticed it in the last week or so, so I really can't pin point when it started. 
As an example, W1AW code practice at 1802.5 is typically 20 of S9 here. When the noise comes on it wipes out W1AW.
Thoights?
TomW3TA