G
Gene E. Bloch
To tell the truth, I don't think any of the things you've mentioned or
linked to are a problem for standard lampcord at 60Hz (though it was
called 60 cycles back then).
To tell the truth, I don't think any of the things you've mentioned or
linked to are a problem for standard lampcord at 60Hz (though it was
called 60 cycles back then).
G
Godzilla
It's always a money-shift in Switzerland.
G
Gene E. Bloch
"it _would_ be a blueshift"
Dumb spell checker won't read my mind...
R
Rod Speed
Brian Gregory said:
SATA data cables are too short for the effect he is talking about to occur.
R
Rod Speed
Brian Gregory said:
But not impedance matching terminators in the sense he is talking about.
Not in the sense of impedance matching he is talking about.
SATA data cables are too short for that approach to be needed.
No it does not, and they arent coax either.
Neither is SATA.
They don’t do impedance matching
in the sense he is talking about.
And when you have just the motherboard on
one end and a drive on the middle connector,
and nothing on the end connector, that end
connector isnt even terminated at all.
R
Rod Speed
Whether he is saying that or not, that is true.
Whether he is saying that or not, that is true.
He wasn’t saying that.
P
Paul
Gene said:
The code words here, suggest lines over 240km long might be
modeled as transmission lines.
http://eee.guc.edu.eg/Courses/Elect...s/Lectures/Modeling of Transmission Lines.pdf
And the article here, suggests 775 miles as a good length at
which to change electrical equivalent model.
http://www.allaboutcircuits.com/vol_2/chpt_14/5.html
"For a 60 Hz AC power system, power lines would have to
exceed 775 miles in length before the effects of
propagation time became significant."
And for various reasons, we don't build extremely long single
hops for power transmission. So maybe switching modeling
schemes, isn't a big issue.
http://en.wikipedia.org/wiki/Geomagnetically_induced_current
*******
At the frequency of interest (60Hz), the lamp cord is "electrically
short", so a lumped model is sufficient to describe the behavior.
If the electrical connection between two SATA devices was
short enough, you might not need any special treatment
of the signals. That distance would likely be a fraction
of an inch, and so the distinction isn't an important one.
For all practical SATA connection instances, you need transmission
lines of appropriate design. (Copper tracks on a PCB can be
used as transmission lines. Known as stripline or microstrip.)
Paul
P
Paul
Brian said:
The IDE ribbon cable bus is source terminated (series damped).
This is a Microsoft Word doc.
See section D.2.2.4 "Source-terminated bus" on page 198.
http://t13.org/Documents/UploadedDo...oiec24739-2-mds-vPtyOverby_vPty080511 GSR.DOC
Paul
R
Rod Speed
Paul said:
No it is not with the effect of a kink.
There is a reason for the limit to the length of SATA data cables.
That is a separate matter entirely to the effect of a kink.
J
J. P. Gilliver (John)
Doesn't it depend whether you're going with the earth's rotation orGene E. Bloch said:
against it?
--
J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf
# 10^-12 boos = 1 picoboo # 2*10^3 mockingbirds = 2 kilo mockingbird
# 10^21 piccolos = 1 gigolo # 10^12 microphones = 1 megaphone
# 10**9 questions = 1 gigawhat
J
J. P. Gilliver (John)
He's probably claiming that those instructions are to do with damageBrian said:
rather than impedance changing.
(Had he suggested that they might be _more_ to do with damage than
impedance changing, he might have had something.)
[]
--
J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf
# 10^-12 boos = 1 picoboo # 2*10^3 mockingbirds = 2 kilo mockingbird
# 10^21 piccolos = 1 gigolo # 10^12 microphones = 1 megaphone
# 10**9 questions = 1 gigawhat
R
Rod Speed
J. P. Gilliver (John) said:
Corse they are, because a radius of 25mm won't
have any significant effect on the impedance.
I have everything anyway.
G
Gene E. Bloch
OK, then there might be a problem with the old suggestion for an
electric car that could go hundreds of miles on electricity, as long as
the extension cord was long enough.
G
Gene E. Bloch
I guess you have to take both that and the gravitational redshift into
account. Thanks for reminding me - I had totally forgotten that.
As for red vs blue shift, the real problem is that I don't remember
which way it goes as you move up out of the depths of the gravitational
well.
We also need to account for the rotation direction of the water going
out of the drain, IIRC.
Or maybe we (OK, *I*) just need to get a life
P
Paul
Gene said:
We'll just have to try it. Here, let me get my car
out of the garage. I have a 240km cord around here
somewhere...
I did actually build an electric car as a kid. It used
a washing machine motor. The pulleys weren't geared right,
so I couldn't use it regularly. But I did get it to go
about 20 or 30 feet around the side of the house. I can
see me driving that baby to work now. And having the
rubber belt snap halfway through the trip (because it
wasn't geared right). I would have needed another pair of
pulleys to get the ratio into the right range.
Paul
G
Gene E. Bloch
Come on, Paul, one model of the Tesla has a 300 mi (almost 500 km) range
and it doesn't even need an extension cord
After yesterday's posts, I got to thinking about street cars and what I
call trackless trolleys. I realized that the overhead wires really
function just like an extension cord.
Kind of ruins the old joke
Trackless trolleys was the term when I was a kid in Philadelphia for
electric buses that were powered like streetcars (called trolley cars in
Phillie) by overhead wires. I mention that because all of those things
had different names in the different cities I grew up in.
That's really impressive, even if it didn't go far. Creative.
J
John Doe
TudnZ2d posted.grandecom> <cbsq2eF56i8U1 mid.individual.net> <m3bgks$enm$1Gene E. Bloch said:Come on, Paul, one model of the Tesla has a 300 mi (almost 500 km)
range and it doesn't even need an extension cord
Bullshit.
--
After yesterday's posts, I got to thinking about street cars and what I
call trackless trolleys. I realized that the overhead wires really
function just like an extension cord.
Kind of ruins the old joke
Trackless trolleys was the term when I was a kid in Philadelphia for
electric buses that were powered like streetcars (called trolley cars in
Phillie) by overhead wires. I mention that because all of those things
had different names in the different cities I grew up in.
That's really impressive, even if it didn't go far. Creative.
Gene E. Bloch (Stumbling Bloch)
Path: eternal-september.org!mx02.eternal-september.org!feeder.eternal- september.org!weretis.net!feeder4.news.weretis.net!
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berlin.de!uni-berlin.de!individual.net!not-for-mail
From: "Gene E. Bloch" <not-me other.invalid>
Newsgroups: alt.windows7.general,comp.sys.ibm.pc.hardware.storage
Subject: Re: "BIOS problem" solved
Date: Mon, 10 Nov 2014 11:22:53 -0800
Organization: Astrolabe
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J
Jerry Peters
In comp.sys.ibm.pc.hardware.storage Gene E. Bloch said:Come on, Paul, one model of the Tesla has a 300 mi (almost 500 km) range
and it doesn't even need an extension cord
With the heater on? I seem to remember a less than enthusiastic review
of the Tesla, specifically the milage claims, where Tesla's response
was something like the reviewer didn't follow instructions -- poor guy
used the heater.
P
Paul
Char said:
Sounds like you had a better junk yard than I did
Mine didn't involve nearly as much planning. It started
with a go-kart type project. And then I spotted the washing
machine motor... So there was no plan from day one to make
it electric. Just an opportunity presented itself in the
form of a surplus motor. We went through a fair number
of washers at our house, and at its peak, there were
three washers downstairs. Two wringer washers, and a washer
with spin dry.
Many people aren't familiar with those things. The
wringer was the kind that could crush your fingers.
The rollers up top, you put wet wash through them,
and it "squashes" out the water for you. Funny thing
is, we never had any finger crushing accidents at home.
When these would rust out, that's where your surplus
electric motor would come from.
http://atthemanse.files.wordpress.com/2013/09/wringer-washer.jpg
Paul
G
Gene E. Bloch
That's cool...