I don't know what "HD BNC" means.  There's only one BNC.  By 3W3 do you mean 
the D-sub shell with 3 coax inserts?  Those are standard items, you could just 
buy one.  The only problem you might encounter is that the cable connector kind 
is probably crimped, and the crimp tooling is likely expensive.  But a solder 
or PC mount connector could be used, with an impedance bump that can be ignored 
for video applications.

Sync on green is the usual from DEC. 

        paul

> On May 3, 2021, at 7:22 PM, Adam Thornton via cctech <cct...@classiccmp.org> 
> wrote:
> 
> I assume it would be way too much to hope that HD BNC would fit it?  Does
> anyone have a pointer to the actual physical dimensions of the itty-bitty
> BNC-ish connector in the video port of the VAXStation4000vlc?  If I can get
> red, green, and blue out (assuming since there are only 3 connectors it's
> sync-on-green) I can put together a sync splitter and turn it into VGA.  I
> have at least one decent multisync VGA monitor still, although none with
> the RGB BNC inputs.
> 
> Adam

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