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i need help how to diy bnc cable

post #1 of 10
11/25/09 at 7:38am
Thread Starter 
never done one what all would i need ? and would like it to be as nice as possible plugs / wire.
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post #2 of 10
11/25/09 at 12:43pm
Digital, I assume?

Ensure you get 75 Ohm wire and true 75 Ohm plugs. Apparently longer cables are better.
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post #3 of 10
11/26/09 at 3:54am
This is a good topic. Would love to see a BOM with sources part #'s as well as how to properly convert the RCA's to BNC. I always read terminate to 75 ohms, what does that mean (schematic) ?

.
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post #4 of 10
11/26/09 at 4:15am
This is simpler than most think in theory, just don't "unlearn" some of the things you've been taught.

1) RCA isn't 75-Ohm, BNC can be. No argument. *There is 50-ohm BNC, know what you're buying.
2) There are lots of good quality and inexpensive coax cables that follow the 75-ohm standard such as G-11, RG-11/U, RG-59, RG-59/U, RG-6, RG-6/U, RG-6/QS, though RG-59/U and RG-6/U are the most common.
3) Unless you have a crimping tool, you really aren't going to make an easy termination.

Now that we have those covered, either consider getting a decent 75-ohm coax cable with a 75-ohm BNC connector or just buy a pre-made or custom made cable from suppliers like MonoPrice.com (from which I've recently bought a 12' BNC-BNC 75-ohm cable that I think is great quality) or perhaps one made by BlueJeansCables.com or Redco.com; both offer custom interconnects.
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post #5 of 10
11/26/09 at 5:12am
Thanks for the info.

What about converting or adding a BNC next to the RCA jack on the DAC, what is the proper way to do that ?
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post #6 of 10
11/26/09 at 5:15am
I convert every single DAC I ever get my hands on to a BNC jack and unless it's overly painful, I run 75-ohm coax wire to the next-in-line component.

Honestly, most DACs should not use the recovered clock, but a proper interface will allow the DAC to make less mistakes, so why not.
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post #7 of 10
11/26/09 at 5:33am
Quote:
Originally Posted by FallenAngel View Post
I convert every single DAC I ever get my hands on to a BNC jack and unless it's overly painful, I run 75-ohm coax wire to the next-in-line component.

Honestly, most DACs should not use the recovered clock, but a proper interface will allow the DAC to make less mistakes, so why not.
OK so you don't have to add a resistor? And can you add it in parralell to the RCA jack, or does that screw up the impedance?


BTW, Just ordered a 3dt BNC-BNC from redco.com for $16, much cheaper than buying the crimp tool and etc.
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post #8 of 10
11/26/09 at 5:34am
Fallenangel, I used a Neutrik BNC jack on my buffalo build, but I didn't realize there was such a thing as 75 - ohm wire. I used some Vortex OCC, around 2 inches worth to the Mux. Should I change?
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post #9 of 10
11/26/09 at 5:35am
Thread Starter 
yeh looks like i would be wasting my time on a digital cable just bought one off bluejeancables about the same price to do it my self minus the time
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post #10 of 10
11/26/09 at 8:54am
Quote:
Originally Posted by johnwmclean View Post
Fallenangel, I used a Neutrik BNC jack on my buffalo build, but I didn't realize there was such a thing as 75 - ohm wire. I used some Vortex OCC, around 2 inches worth to the Mux. Should I change?
there was just a discussion about SPDIF cable length at DiyHIFI. It degenerated till the thread was locked, but there is some info in there about impedance mismatches and cables.
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