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RE: Cable advice - Cable type


  • To: <ukha_d@xxxxxxx>
  • Subject: RE: Cable advice - Cable type
  • From: "Dr John Tankard" <jtankard@xxxxxxx>
  • Date: Tue, 19 Sep 2000 14:30:20 +0100
  • Delivered-to: rich@xxxxxxx
  • Delivered-to: mailing list ukha_d@xxxxxxx
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

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> I have a sinking feeling about this.... :(
>
> I am about two thirds of the way through retro-fitting Co-ax cable for
> video distribution, and I have been using Maplin's cheap and cheerful
> White Co-ax.
>
> The longest run I have in the house is 7m, from my wiring closet up
> into the loft, then down again into the living room.
>
> Question is: am I wasting my time with this cable, or is the quality
> likely to be okay over short runs? I decided to do the most awkward
> runs first, so I am hesitant about ripping it out :(

Ian,

It depends....

what you are doing will be ok to distrbute a signel from your video to a TV
now.

The problem is the cable you are using is unlikley to be good enough for
digital services, you may get away with it over very short distances.

The cable you are using is normaly rated at 900Mhz with a loss of 26dB/100m
CT100 is about 18dB because of the logrithmic scale that is a very big
difference. When you go past 900Mhz I dont think they even bother to quote
a
loss figure.
Personaly, and I dont know how much work you will have to do to swap it,
but
I would cut your losses and swap the cable.

The cable you are using is normaly rated at 900Mhz with a loss of 26dB/100m
CT100 is about 18dB because of the logrithmic scale that is a very big
difference. When you go past 900Mhz I dont think they even bother to quote
a
loss figure.

John






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