8 Jun
2023
8 Jun
'23
4:49 p.m.
On Jun 8, 2023, at 12:06 PM, Jonathan Stone via cctalk
<cctalk(a)classiccmp.org> wrote:
On Thursday, June 8, 2023 at 05:20:28 AM PDT, Santo Nucifora via cctalk
<cctalk(a)classiccmp.org> wrote:
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
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)