Is SDI cable the same as RCA component with BNC connectors?

I have a camera with SDI out that I want to run to record.
Does SDI out have both audio and video in the one output?
Can I use 100 foot of RCA cable to run the SDI out to a recorder or do I have to buy 100 foot of SDI cable?
Thank you
artismobileAsked:
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CompProbSolvCommented:
This article explains it fairly well:
https://en.wikipedia.org/wiki/Serial_digital_interface

It is a digital signal where the component or composite video is analog.  The cable could be the same but the signals are not.

You could use the RCA cable if it is 75 ohm impedance and of reasonable quality.

Does your recorder support an SDI input or is it component or composite video?

According to the article cited above it is optional to include audio.
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artismobileAuthor Commented:
The recorder is SDI with BNC connectors.  I don't know if the cable is 75ohm but it says RG-59/U FLEXIBLE BROADCAST VIDEO CABLE
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CompProbSolvCommented:
That cable ought to work.  Is it difficult to just try it and see how it goes?

RG-59/U (if it really meets the standard) is 75 ohm characteristic impedance.
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artismobileAuthor Commented:
Ok,
I can try it this afternoon when the recorder/switcher comes in.  I was going to just go buy the cable in advance if the RCA was not designed to work.
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CompProbSolvCommented:
If by "RCA cable" you are referring to cable with RCA connectors on either end, you could have some issues with the use of RCA-BNC adapters.  If this were analog (and it is not) then there may be ghosting caused by characteristic impedance mismatches.  Digital transmission is much better about dealing with such things until they cross some threshold and then it becomes a huge mess.  The "correct" answer is to buy the proper cable (make sure it is a reputable brand) with 75-ohm BNC connectors on it.
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artismobileAuthor Commented:
The RCA to BNC connectors will be a problem?
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CompProbSolvCommented:
Actually, the RCA connectors are the issue.  They are not really 75 ohm characteristic impedance.  While not "proper", they likely will work just fine.

Any additional connectors provide one more place where corrosion can occur.  Also, with the RCA connectors, you lose the positive lock that a BNC makes.  If someone tugs on the cable it can be loosened or pulled off.

On the other hand, it looks as if you can get a proper 100' SDI cable for under $100.  You'll have to weigh if the benefits outweigh the cost.
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