Re: WTD: A few decent used analogue monitor leads
- From: "Marcus Redd" <read@xxxxxx>
- Date: Fri, 18 May 2007 17:13:45 +0100
"Palindrome" <me9@xxxxxxxxxxx> wrote in message
Marcus Redd wrote:
I bought some cheap Belkin (bleurgh!) leads from eBuyer but they wereGenders and length needed?
crap - the screen was "ghosting."
They didn't have that magical mysterious cylinder around the cable - I'm
guessing that's why the ghosting - btw, what is that thing?
Anyway, any offers?
Erm - same gender both ends - to go between PC and monitor - that make
sense? Length - the one I have here is something like a meter and a half...
I've found one reasonable source is the lead sets that come with the
cheapest ebay 4way KVM. The switches may not be that good, but the cables
seem pretty reasonable..Some come with 4 x 3m cables...YMMV.
Hmmmm... interesting! I'll check it.
The magic cylinder is a ferrite core. It will degrade the signal(s) but
hopefully degrades the noise more... The signal degradation will appear
as edges becoming less sharp - which can sometimes make the picture *look*
Ghosting is due to an impedance mismatch causing power to be reflected
rather than absorbed. One way to prevent that is to use a monitor with
individual BNC inputs. If the monitor itself doesn't allow the leads to be
correctly terminated, you can add T pieces and terminators at the input
sockets. A ferrite core can improve ghosting but will also attenuate the
wanted signal. Impedance matching is a better solution.
You used to be able to buy "dongles" with built-in terminators that went
between monitor socket and cable plug. A cheaper alternative to BNC cables
and monitors. All been overtaken by using digital instead of analogue
signals to the monitor.
Well, you certainly know your impedance mismatching! Thanks for taking the
time, very much appreciated.
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