"I always consider the system as a chain,.. only as good as the weakest link. As a chain goes,.. all weight must be carried through each link, the weakest link determines the chains overall ability. As the system goes,.. all information must pass through All cables & connectors, in full duplex (both ways), overall system performance may be greatly effected by 1 bad coax, incorrect splitter or ends.
Or as mtsguy has made me see the light,.. even pvr tanning can have a drastic effect."
exactly, i had had cases were im doing 3 tv's on coax, first two are RG6 hooked up, working fine, last tv is some really poor quality copperbraid 59 that cannot be replaced, threw kitchen cabinets, enclosed ceiling etc, as soon as i connected it, the other two tv's on coax started to pixelate. the reason for this is, coax cabling is shielded from outside interference, radio, microwaves, OTA television etc, any bad cabling, ei, dollar store copper braid 59, acts like an antenna picking up all this noise and inserting it on the HPNA network, so even tho 2 tv's have great coax, that 1 RG59 cable with poor shielding thats been stapled threw 6 times, brings the whole RF network down. thats why cat5 is preferred. its not RF. but, if you have brand new RG6 with compression ends, proper splitters, no staples etc, you won't have problems. Even older 59 that shaw/videon used is still good cable, belden, commscope etc. Its when people "renovate" and stop at the dollar store for their tv cable you start having issues. they are basically running "antennas" in their walls to pick up noise and RF junk. that is why ends need to be changed and cable needs to be high quaility. a comment i get alot from cust's is that "that cable worked fine on classic, or worked fine on classic shaw" thats becuase its not digital, any interference that was picked up was either filtered out by the tv or so minimal you didn't even notice. this is also why some installers are hesitant to light up all the outlets in your house incase you want to move your tv's around. not only are you getting extra dB loss on your splitter from over splitting it, all those open ends are chances for noise to get in the system.
sorry for the long post, just like to share some knowledge