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RE: Cable advice - long runs?
- To: <ukha_d@xxxxxxx>
- Subject: RE: Cable advice - long runs?
- From: "Dr John Tankard" <jtankard@xxxxxxx>
- Date: Tue, 19 Sep 2000 11:11:47 +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
>Hello John
>Can you please give me some idea of what you'd call
>"a long run" in metres or feet, whatever! :-)
>I was considering using CT125 throughout but as I can
>get coloured CT100 which would enable me to distinguish between
>video in (black) and video out (brown or white) I thought that
>I'd use that.
>However I could always use CT125 for video in to minimise the
>losses and use a coloured CT100 for video out where the signals
>should be at a higher level anyway.
>BTW I've got some runs which will be in excess of 25m.
Tracey,
You will have no problem at 25m with CT100 its only when you are going for
long distances >100M where it might be worth looking at or very high
frequency operation. at 3000Mhz the Atten dB/100M is 36 for CT100 & 31
for
CT125. Remember this is a logarithmic scale.
Really top quality distribution cable is around 20 dB/100M but this is over
twice the thickness of CT100, both in terms of overall size, conductor dia
&
price.
John
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