Re: Best brand coax and F connector for HD cable?

["Rogue Petunia" <FakeAddress@xxxxxxxxxx>]

Hey Eric,
I didn't so much understand the mapping issue you mention in #1.  But 2 and
3 make sense.  I currently have 2 splits and 4 unterminated outlets, which
could be adding noise.  That's why I'm going to run new wire and do a
homerun.  Hope it will help.

<egrumling1@xxxxxxxxxxx> wrote in message
news:1140891960.888411.286010@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> There may be several reasons the HD feed is having problems:
>
> 1) The channel displayed on the box (IE: channel 6) may actually map to
> another channel, likely a HD feed of the same channel.
>
> 2) The HD feeds are at a much higher frequency than any of the other
> channels (likely)
>
> 3) The HD feed uses a 256 QAM signal. The normal digital channels are
> on a 64 QAM signal. The 256 QAM is much more sensitive to noise and
> impedance mismatches. Noise can come from many sorces, but ususally
> there just isn't enough signal to get above the noise floor. Impedance
> is how much "resistance" there is in the cable, measured in Ohms. TV
> cable is 75 Ohms, but improperly installed connectors, moisture in the
> dialectric (white plastic), kinks and staples, and of course those junk
> splitters, can all change the impedance. Again, the 64QAM and analog TV
> are much less suceptable to missmatches (although analog tv can get
> gosting), but 256 can get picky.
>