Author Topic: Whats the MAX length a s-video cable can go?  (Read 2025 times)

Offline xpert1974

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Whats the MAX length a s-video cable can go?
« on: June 05, 2002, 00:03 »
I want to connect my PC to my tv in the hall. Any idea how long w/o much distortion a s-video cable can go?  Where can I get the cheapest s-video cable?  Quality does not matter cos the signal is from comp tv out

Offline Jag

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Re:Whats the MAX length a s-video cable can go?
« Reply #1 on: June 05, 2002, 00:16 »
Using standard Belden cable for S-video, 10m runs should be pushing the limit of quality. If quality is of little concern, then 15m can still provide reasonable PQ.

If use for longer runs, I suggest break out S-video cable to RG-6 cable for runs exceeding 10m.

Such RG-6/RG-11 can run to as far as 25m/40m.

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Offline Ender

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Re:Whats the MAX length a s-video cable can go?
« Reply #2 on: June 05, 2002, 10:16 »
Jag,

Can you explain what all these RG-6/11 rating means? Is it similar to AWG rating use in gauging the thickness og the cables?

Offline Jag

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Re:Whats the MAX length a s-video cable can go?
« Reply #3 on: June 05, 2002, 12:45 »
RG-59 co-ax cables is the industry standard for 75ohm video cables.

Its a battle proven way of transfering signals with minimum loss & interference thru co-ax. RG is short for Radio Guide. Invented by the americans for their radar system in WW2. The number represent the specs drawn up for that number type.

Today,a cable manufacturer would specify "RG-59 Type". It means the cable capacitance, signal propagation velocity, dimension, loss ..etc... all obey the RG specification of that number.

RG-59 AWG is 20AWG. SCV uses this type of cable; under a different manufacturer product number. But its still RG-59 type.

Next up for 18 AWG would be RG-6. Thicker thus less attenuation or loss. A great step up in terms of signal integrity. Used commonly in studio setups. Not easy to work with but still manageable.

14 AWG would be RG-11. Very thick and not very easy to work with.

10 AWG would be overkill and would not be practical. I won't cover that.

Attenuation @ 100MHz:
RG-59-> ~10dB/100m
RG-6 -> ~6.5db/100m
RG-11 -> ~4.9dB/100m

A rule of thumb, longer the run, the thicker the cable.

In US, RG-6 is used for in-house cable runs, where outdoor BUD (big ugly dish), a semi-rigid thick co-ax able s used to minimise attenuation.
Electronics : Denon 7200, MiniDSP Dirac 88A, Emotiva XPA-5 Gen2
ATMOS Audio : Martin Logan Ethos (L&R), ML Motif X(C), ML Motion 4 (14pcs surround spkrs)
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Video : Sony VPL-HW55ES, Stewart Screen Studiotek 1.3
Source : HTPC
Fully automated HT via Alexa, Z-wave and Logitech Harmony Remote Control