Flux like that is typically terrestrial born interference in my experience.
WVMAN, the ABC issue could be that air conditioning around you is cycling on and off in prime time, vs during midday it's just on. Arc in those contactors, or from dirty brushes in the condenser fans can make broad-band racket clear up into C-Band.
Filters on the waveguide can sometimes help -- prevents AGC pumping / compression point IMD. I had a case two or three years back on an antenna near a furniture factory where an evanescent mode waveguide filter between the feed and the LNB turned out to be the magic bullet cure for intermittent signal q drops.
But if that interference is "in band", you have to hunt it down and fix it.
One instrument to hunt interference down with is just simple open wg on an old LNB, connected to a signal strength meter or some sort (analogs are quicker than digital ones, easier to find intermittent trash) and power. Aim it at things that might be generating arcs (motors, contactors, power poles, small engines, the like). Arcs are usually very broadband noise sources.
Good hunting!
WVMAN, the ABC issue could be that air conditioning around you is cycling on and off in prime time, vs during midday it's just on. Arc in those contactors, or from dirty brushes in the condenser fans can make broad-band racket clear up into C-Band.
Filters on the waveguide can sometimes help -- prevents AGC pumping / compression point IMD. I had a case two or three years back on an antenna near a furniture factory where an evanescent mode waveguide filter between the feed and the LNB turned out to be the magic bullet cure for intermittent signal q drops.
But if that interference is "in band", you have to hunt it down and fix it.
One instrument to hunt interference down with is just simple open wg on an old LNB, connected to a signal strength meter or some sort (analogs are quicker than digital ones, easier to find intermittent trash) and power. Aim it at things that might be generating arcs (motors, contactors, power poles, small engines, the like). Arcs are usually very broadband noise sources.
Good hunting!