[DCASAZZA]

I have been enjoying my restored chassis from my 650, noodling around the bands trying to copy the worst signals to be found, that is untill night. What the blazes is the rythmic noise I find from one end of the dial to the other (with few exeptions). Only good signals over-come this constant drone. I have gone so far as to kill every circuit in the house to rule out anything with a 'chip' , battery chargers, tv's and such. No Joy. My ICOM-701 picks it up on 80-15 as well to varing degrees.
I remember a time I could listen to NY City AM stations at night from south Florida with a TRF or car radio.
Ive heard BPL samples and this too rythmic and steady. I cant help but feel this is some type of data sourced interference.

It only comes out at night... any ideas?