> On Jun 8, 2023, at 12:06 PM, Jonathan Stone via cctalk
> <cctalk@classiccmp.org> wrote:
>
> On Thursday, June 8, 2023 at 05:20:28 AM PDT, Santo Nucifora via cctalk
> <cctalk@classiccmp.org> wrote:
>
>> I bought mine from this ebay auction: https://www.ebay.com/itm/171649843131
>> Specifically, the "D-SUB 3W3 Male" item.
>
> [...]
>
> Note these are 50 Ohm impedance. I always assumed the OEM originals were 75
> Ohm.
> I've not been able to find 75 Ohm equivalents in the past 3 years I've been
> looking.
>
> OTOH I'm not a hardware person, I have no idea if a ~1.5cm-long connector
> matters, especially if it's connected to a non-coaxial VGA cable, then to the
> VGA input of a multi-sync flat panel display. (I'm not sufficiently retro to
> want to go back to carrying 19in sync-on-green CRTs)
Normal VGA connectors are DE-15, which have no defined impedance in the first
place. No, short unmatched segments like that don't matter at all, not at VGA
frequencies.
If a cable claims to be VGA but isn't coax I would call it fake. An actual
cable carrying video signals does need to be coax, and does need to be the
correct impedance (i.e., 75 ohms).
paul
