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5 BNC superior

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lwang

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In Reply to: Component Video Question: 3 RCA vs. 5 BNC posted by ChicagoT5 on August 05, 2004 at 18:35:00:

Besides seperating the vertical and horizontal sync into seperate signals, the BNC connectors are true 75 ohm connectors, meaning you will have 75 ohm characteristic impedence from component to component. It is not possible with RCA connectors because the female jack does not allow for it.
But 5 cable RGBHV is not component video. Your input/output equipment has to be able to accept RGBHV.

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Re: 5 BNC superior - michael w 22:06:19 08/06/04 (1)
Quite true re:RCA's but most BNC's sold today are still 50 ohms.
The Canare and Cardas RCA's are pretty close to 75 ohms.
IME the quality of the connector is more important than attempting to maintain a continual 75 ohm impedance.
You are not likely to be able to see the difference between 50 ohm and 75 ohm connectors of good quality.
- 75 ohm RCA's (Open in New Window)
- Better Cable Specs - ChicagoT5 08:09:38 08/07/04 (0)
  Here are the specs for the "Better Cables" cable I ordered (although I am too ingnorant to understand/appreciate the technical stuff):
  Begin Qoute:
  The cable features Solid 99.999% pure Silver coated copper center conductors, hard-cell high-density foam PE insulation, 75-ohm impedance (with impedance-matched connectors), low 17.3 pF per ft capacitance, and triple shielding for unmatched RF and EMI interference protection. This cable is also NEC CL2 rated for in-wall use.
  End Qoute:
  I do know from previous computer set ups that analog video singals are subject to all kinds of problems. I had a long run (~12') from a computer to a monitor, and I had a very hard time getting a decent picture (ghosting and fuzziness). The higher the resolution, or the refresh rate, the worse the problems became. Upgrading the cable improved things noticibly, but it was still not as good as a short run. I switched to DVI and a LCD monitor, and the video quality improved greatly. I hope/expect that DVI, or some other digital cable, will be the way of the future for HT, but for now, my set up will be mostly analog.
I Have Both - ChicagoT5 20:50:36 08/05/04 (2)
My DVD Player and Receiver both have the 3 RCA style, but my JVC SX21 Projector has the 5 BNC. Are these compatible in any way (i.e. can the 3 be converted to the 5)? My PJ will have a 30' run from the source, so I am looking for the best possible cable. If these aren't compatible, then I will have to go with either S-Video or DVI (which my DVD does not have).
- Projectors should be compatable with both - lwang 20:58:48 08/05/04 (1)
  Since it should also be able to accept 3 wire component input via 3 of its 5 connectors.
  You should have a scaler near the DVD player, scale the image there and feed the long run via RGBHV. But good ones runs a bit of money.
  - VGA? - ChicagoT5 21:45:33 08/05/04 (0)
    I found a VGA to 5 BNC cable, which leads me to believe that the 5 BNC is for connecting to PCs, which makes sense for a PJ since they are often used with puters. I used to have a Mitsubishi monitor that had the 5 NBC connectors. I am guessing that the other two connectors have to do with synch rate and resolution.
    BetterCables does make a 3 RCA to 3 BNC cable. I will give them a call and ask them about attching to 3/5 of the BNC connectors on my PJ.
    Thanks for your help.

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