That VAXStation4000vlc 3W3 video connector

[Doug Jackson]

HI Paul,

"I don't know what "HD BNC" means.  There's only one BNC"

Years ago when working in a university with Photomultiplier tubes, we used
HV BNC connectors - these looked like standard BNC, but were rated at 10kv.

https://www.radiall.com/products/rf-coaxial-connectors/high-voltage-connectors/bnc-ht-mhv.html

We also used to use 75 Ohm BNC connectors for video systems.

https://www.hubersuhner.com/en/products/radio-frequency/connectors-adapters/bayonet-connectors-bnc/bnc-75-real

It is worth noting that there are multiple BNC connectors.


Kindest regards,

Doug Jackson

em: doug at doughq.com
ph: 0414 986878

Check out my awesome clocks at www.dougswordclocks.com
Follow my amateur radio adventures at vk1zdj.net

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On Tue, 4 May 2021 at 15:30, Paul Koning via cctalk <cctalk at classiccmp.org>
wrote:

> 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 <
> cctech at 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
>
>