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Topic:
Can SDI video use RG6 coax or does it require a special coax cable?
This thread has 17 replies. Displaying posts 1 through 15.
Post 1 made on Thursday August 13, 2015 at 07:04
GLS
Active Member
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A forum search didn't really help. This is for a church. The SDI is for the cameras they want to use to record and stream their services. The forum search talked mainly about CCTV it seemed.

The main question is this. Do they have to buy pre-made SDI cables to run from the headend to the cameras, or can they run RG6, 3G coax to a wall plate and use a shorter pre-made cable from the wall to the camera?

Hoping someone here has done that? Or knows that it can be done?

TIA

G
www.GordonsLight.com
"As iron sharpens iron, so one man sharpens another" Proverbs 27:17
Post 2 made on Thursday August 13, 2015 at 08:03
brent mccall
Long Time Member
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SDI will work with plain old RG/6 just fine, it will even work thru an F81 barrel connector.
However, you must use a 75 Ohm BNC connector (not 50 ohm).
Brent McCall
Envy, it is a dirty emotion.
Post 3 made on Thursday August 13, 2015 at 08:09
AVXpressions
Senior Member
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I have some SDI cameras running over solid copper RG-6 cable that are 700 foot runs.
Post 4 made on Thursday August 13, 2015 at 11:24
ichbinbose
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I've used the ethereal sdi over rg6 to a 4k xbr and it worked great - note, I'm not sending 4k, just 1080 from the dtv receiver and the bluray
4k is done at the tv and audio back fed to the receiver
Post 5 made on Thursday August 13, 2015 at 12:06
Ernie Gilman
Yes, That Ernie!
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Brent,
what wire is actually specified for SDI? I think it might be helpful to have that mentioned in this thread. We are forever running into real world situations where we have to evaluate and choose to do something that might not work,* and I think it helps to know the target item.*

Thanks



*Cases such as having a ten foot length of CAT5 that's already in the faux-painted wall going, for some reason, around that corner to exactly where we're mounting the far speaker being the "might not work"; and 14 gauge speaker wire, which is the "target item," for instance.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 6 made on Thursday August 13, 2015 at 16:37
brent mccall
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On August 13, 2015 at 12:06, Ernie Gilman said...
Brent,
what wire is actually specified for SDI? I think it might be helpful to have that mentioned in this thread. We are forever running into real world situations where we have to evaluate and choose to do something that might not work,* and I think it helps to know the target item.*

Thanks

*Cases such as having a ten foot length of CAT5 that's already in the faux-painted wall going, for some reason, around that corner to exactly where we're mounting the far speaker being the "might not work"; and 14 gauge speaker wire, which is the "target item," for instance.

Ernie:

For SDI you need to use a 75 Ohm Coax, this could be RG/6, RG/59 or Mini 59.
While testing has shown that SDI will work on Copper Clad Steel we do suggest that you use Bare Copper coax.
Testing has also shown that the distance can be from as little as 15' and up to 300' (safely).
Brent McCall
Envy, it is a dirty emotion.
Post 7 made on Thursday August 13, 2015 at 16:56
Ernie Gilman
Yes, That Ernie!
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Thanks. That answers questions others might have later, too.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 8 made on Friday August 14, 2015 at 03:09
ErikU
Long Time Member
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151
SDI is my primary business.

I highly recommend:
Belden 1855 (mini coax for short runs
Belden 1505 for runs up to 200' or so
Belden 1694 for runs up to 300'

HD-SDI will not work past about 300'. Be sure to use all 75 ohm BNC connectors. I suggest ADC connectors.
Post 9 made on Friday August 14, 2015 at 12:07
Mario
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Erik, nice work you guys do there.

I want this in my office :-)
[Link: static1.squarespace.com]

That should take less than a day and about 2 grand, right? :-)

Sorry, can't figure out what the actual pic is; thus the link.
Post 10 made on Friday August 14, 2015 at 19:45
ErikU
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151
Thanks. That was from a Broadcast Operations Center we did for a client that owns TV stations across western states. This BOC hubbed master control operations for 48 channels! The pic was actually taken before most of the channels were operational.
OP | Post 11 made on Saturday August 15, 2015 at 07:44
GLS
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On August 14, 2015 at 03:09, ErikU said...
SDI is my primary business.

I highly recommend:
Belden 1855 (mini coax for short runs
Belden 1505 for runs up to 200' or so
Belden 1694 for runs up to 300'

HD-SDI will not work past about 300'. Be sure to use all 75 ohm BNC connectors. I suggest ADC connectors.

From the picture Mario posted I'd say you do some incredible work! But this is a small-ish church. They want to be sure that they use quality cabling but for in-wall can a standard RG6, 3ghz, solid copper core coax work? 10 cents a foot vs a dollar a foot?

Their video guy has also been researching and thinks they need a stranded core cable (in the walls). Is that true? (From the wall to the cameras would be factory whips)

I just don't want them to pay for wire they don't need if that money can go to other equipment.

Thanks!
www.GordonsLight.com
"As iron sharpens iron, so one man sharpens another" Proverbs 27:17
Post 12 made on Saturday August 15, 2015 at 15:06
Ernie Gilman
Yes, That Ernie!
Joined:
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30,104
The drawback of solid wire is the difficulty of bending it behind a normal thickness wall without putting a lot of strain on the connectors. Flexible is better if you're going to move (i.e. flex) the wire occasionally.

The video guy should come up with a reason to use whatever he chooses, something better than "he thinks." And hey, run it by us! He might come up with reasons we've never thought of.

Definitely use 75 ohm connectors everywhere.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 13 made on Sunday August 16, 2015 at 09:42
Neurorad
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On August 13, 2015 at 12:06, Ernie Gilman said...
Brent,
what wire is actually specified for SDI? I

I think you mean 'what cable'.

Come on Ernie, get with the program.

Why do we technical people refuse to call things what they are?

Erik - wow. That's some serious AV porn.
TB A+ Partner
Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense. -Buddha
Post 14 made on Monday August 17, 2015 at 02:56
Ernie Gilman
Yes, That Ernie!
Joined:
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30,104
Wire: metal drawn out into the form of a thin flexible thread or rod.
Cable: an insulated wire or wires having a protective casing and used for transmitting electricity or telecommunication signals.
Those are the relevant definitions for each term that you get when you google "define wire" and "define cable."

Neurorad,
Cables are made out of wire(s). It's totally correct to ask what cable is specified for SDI. It's also possible, but unlikely, that SDI might go over a wire. In fact, if you think about it, wouldn't it be wrong to say SDI doesn't go over a wire? You're being pickier than I am in an attempt to mock me.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 15 made on Monday August 17, 2015 at 05:57
Neurorad
Super Member
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Ribbing, not mocking. ;)

I know it' s hard to tell which is which these days.
TB A+ Partner
Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense. -Buddha
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