I think that would have to do with line loss at longer lengths. For long
cables you need well shielded low resistance low loss. Same as antenna wire,
short runs can be RG59 but long runs need to be RG56 (If I have it right!).
I have several cheap HDMI cables. One did not work at all, the others work
fine (defined as good picture with no digitizing). Of course, the cable in
is more important for that anyway. I can't find any difference between cheap
and expensive (other than price of course) and I do use a switch as well.
----- Original Message -----
From: "David Ross" <[email protected]>
To: "Bruce Markowitz" <[email protected]>; "Rob Bell"
<[email protected]>; "Jonathan Berry" <[email protected]>
Cc: <[email protected]>
Sent: Wednesday, March 24, 2010 5:09 PM
Subject: Re: [Thinkpad] Picking a new notebook
Since HDMI is pure digital, cable quality is something of a misnomer.
Digital is pretty much on/off, so it either works or does not. At the
shows there are cheap HDMI cables, sometimes as low as $6.00
They work
They don't always, of course. Our HDMI cables run from very cheap to
extremely cheap, and in one recent rewiring found that only the second of
the following two configurations worked:
(1) TV--cheap cable--HDMI switch--ubercheap cable -- video source
(2) TV--ubercheap cable--HDMI switch--cheap cable -- video source
I don't know what can cause partial failure in a cable for a purely
digital signal - maybe in the case above the switch is not quite hdmi
compliant, with a minimal voltage requirement above the hdmi spec, and the
wire in the cheap cable has slightly high resistance - but to avoid
frustration it is worthwhile to buy from a dealer like Monoprice or Blue
jeans that uses Belden cable or equivalent; the cost premium above
eBay-generic is pretty minimal.
For analog cables (like VGA) all bets are off. I use high-resolution
projectors a lot, and have encountered many long cheap cables that work OK
at 800x600 but are essentially useless at 1280x768.
David
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