DrewL wrote:
> I need to run 250 ft. of 2 cables, and they have to be right next to
> each other. I'm trying to figure out if low-voltage DC electric
> interference will be an issue. Hopefully the following data is
> sufficient:
>
> Cable 1: twisted pair
> 15VDC at 13W
> 2 conductors, 16AWG: stranded bare copper, radius=0.645mm, resistance
> 4ohm/1000ft.
You don't need to twist them and solid 14AWG solid might be cheaper.
(With the price of copper going up, the #16 might be cheaper, but it's
not a standard gauge for power wiring.)
>
> Cable 2: Coaxial
> 18AWG conductor: solid bare cooper, radius=0.51mm, resistance 6.4ohm/
> 1000ft.
> Full copper braid and foil ****eld: see full specs for VSD2001 in
> http://www.gepco.com/products/proav_cable/video/coax_hd_sdi_F.htm
>
> The signal is SMPTE 292M, a.k.a. HD-SDI, carrying 70mA of 800mV peak-
> to-peak, at 1.5Ghz. More detail in http://en.wikipedia.org/wiki/HD-SDI
> . I know the coax alone is fine, since the manufacturer certifies it
> for 300-560ft. of HD-SDI.
>
> I'm not expecting anyone to delve into the HD-SDI specs to figure out
> exact error tolerance, I just hope to get an idea of whether I should
> be worried or not. Should I go to lengths to get a ****elded version of
> cable 1?
>
> Any insight is appreciated.
DC doesn't radiate! No problem. Even if the DC is "noisy" the co-ax
****elding should be adequate.
--
Virg Wall
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