[Tig] BNC to XLR? (Aaton Keylink Install Question)

[Philip Mendelson]

Careful about that 600 ohm assumption.  
If you use a 600 to 600 transformer, not only are you probably wasting your money, but chances are the input of that Keylink is active and bridging, which means it won't provide the termination that transformer wants.  Without it, you'll get ringing and overshoot, and may actually increase crosstalk problems in your system.  Same thing with the source....it's not likely to be 600 ohm.
Center to pin 2, ground to pin 3 should work great. Try it without even using pin 1 first.

Phil

----- Original Message -----
From: tig-bounces at tig.colorist.org <tig-bounces at tig.colorist.org>
To: tig at tig.colorist.org <tig at tig.colorist.org>
Sent: Sat May 24 08:50:10 2008
Subject: Re: [Tig] BNC to XLR?  (Aaton Keylink Install Question)

1850 subscribers as of May 2008
Bill Laverty supports the TIG
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>Just installed our Aaton Keylink and came across this issue:  Our  
>deck's LTC output interface is BNC.  The Keylink's LTC "VTR-IN" is  
>XLR.  Can I just make a cable to get these two interfaces to talk or  
>do I need some sort of BNC to XLR conversion box (if they even  
>exist).  If the answer is making a cable does anyone know which of  
>the three XLR pins the LTC signal is running on?

Canare makes a nice transformer: http://tinyurl.com/3o295d

Alternately, you can just hardwire pin 2 to the center, and pins 1 and 3 to
the ground. 

Or to be more technically correct, get a small 600 ohm to 600 ohm audio
transformer and connect one side to pins 2 & 3, and the other to center and
ground. Timecode is just narrow band audio.

--Bob

Bob Kertesz
BlueScreen LLC
Hollywood, California
bob at bluescreen.com

The Ultimate in ULTIMATTE® compositing.  
For details, visit http://www.bluescreen.com

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