said by Bob4: said by cablewizzard:
the loss of 7.5dB of signal IS suspicious, if you haven't changed any wiring off the pole lately, node balancing tends not to shift signals that much.
My received power went from +6.75 last night to -6.00 this morning. That's a drop of 12.75 dB overnight.
Last week it jumped by +8.5 dB. So that's from -2 to +7 to -6 dB all in a week.
Cablevision does mess with the power levels significantly. I wish they'd stop!
We're getting off-topic here, but swings of that magnitude strongly hint at a defective amp or other severe impairment. It seems too strong to be an issue merely at your drop. If you're experiencing *perceivable* problems (pixelation, voice breakup, Internet not working, modem rebooting, VOD controls not working), you should call this in.
Node balancing doesn't move signal up or down by more than a few dB (5), a node-split can move it more than that, but levels stay where they are afterwards.
Seasonal (temperature) variations can exceed 4dB between say: 30 and 90 degrees (F), depending on how much coax is between you and the node.