Re: 75 Ohm Coax Recommendation for an RGB Cable
- From: "Roger Hamlett" <rogerspamignored@xxxxxxxxxxxxxxxxxxx>
- Date: Thu, 14 Jul 2005 14:33:14 GMT
<William P. N. Smith> wrote in message
news:k7lcd15naa5uhekiv2sicbs03lppud22st@xxxxxxxxxx
> "Don" <someone@xxxxxxxxxxxxx> wrote:
>>>From what I have read, RGB video cables are 75 ohm impedance. However,
>>I
>>have never seen a recommendation for the RG number (or other qualifier).
>>I
>>am looking for a good quality cable as we want to go about 15ft with the
>>signal. (Moving a monitor from one part of our lab to another.)
>
> If it's just analog video you probably don't need a lot of bandwidth,
> just about any RG59 will do. NTSC not only tops out around 3.58MHz,
> but corrects amplitude with the color burst...
RGB, implies this is not NTSC...
Depending on the resolution, bandwidth can be significant. 300MHz for
modern large monitors. Most cable maufacturers will offer 'triple co-ax',
or 'triple + sync', and for a PC monitor, it'll be the latter that is
needed.
How careful you need to be, will depend massively on the monitors
resolution, and sync rate.
Best Wishes
.
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