[time-nuts] Possible candidate for 10MHz sine distribution

Charles P. Steinmetz charles_steinmetz at lavabit.com
Sat Jun 8 10:17:43 EDT 2013


>Probably not a good choice for 10MHz distribution.  It's an NTSC 
>composite video DA.  NTSC composite video is relatively low 
>bandwidth, typicaly 5MHz or so.  Without complete specs in this DA, 
>you can't rely on it having sufficient bandwidth, even for a 10MHz 
>sine wave; certainly not sufficient for anything resembling a pulse 
>or square wave.

Also, while the listing says the input and output impedances are 
"standard 50 ohms," the manufacturer's datasheet specifies 75 ohms 
(the NTSC standard):

www.megahz.com/specimages/Videotek/VDA-16-VDA-16A.pdf

It does not appear to have the headroom to handle a 1 Vrms (+13 dBm @ 
50 ohm) signal.

Best regards,

Charles






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