Not sure if good idea, bad idea or evil idea
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@HardwareGeek said in Not sure if good idea, bad idea or evil idea:
@acrow said in Not sure if good idea, bad idea or evil idea:
Signal propagation happens (at most) at the speed of light, even in copper cable. Though copper cable has some other factors too.
Depending on those factors, it tends to be around .6–.7c. 2/3 is a good rule of thumb, absent information about the specific cable.
Nice to know. Does that apply to signal reflections as well?
My company sometimes needs to work with existing site cabling, and terminating those for use in a digital fieldbus is...
I've been thinking of making a field analysis rig, but wasn't sure how fast it would need to be to capture reflections.
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@acrow I would expect the signal to travel at the same speed in both directions, so yes, reflections, too.
I should also say that my experience, and that rule of thumb, are for coax. I didn't think about twisted-pair cables when I was writing that. The velocity factor (ratio of propagation speed to speed of light in a vacuum) may be significantly different. Wikipedia tells me that Cat-5e is .64, Cat-6A is .65, and Cat-7 (which I didn't know existed) is .74–.79. Old Cat-3, if you ever run across that, is.58.
So, 2/3 is still pretty close for twisted-pair cables you're most likely to run into.
Wikipedia also tells me that rule of thumb really isn't a very good rule of thumb. It may have been ok for the cable I was using back when I was doing RF stuff, but coax varies pretty significantly, and there isn't really a general rule of thumb.
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@HardwareGeek Cat-5 would be nice. But when I say "fieldbus", it's usually RS-485. And by "site cabling", I mean mostly 3-wire power cables, but with a few ancient 20mA current-loop cables or other instrumentation cables thrown in.
Our customers generally don't want to spring for specialized cabling, so even in completely greenfield projects we might have to do with 3-wire power cable for communication. In older placed, we have to try first using whatever old cabling is already there. Because if it does work, then new cabling is an extra expense. ...Funny enough, most of the time that old cabling still works. But it may also be tree-shaped enough that we have to terminate the bus on more than 2 ends to make it work. Which is well outside the RS-485 specification. But at a low enough baudrate and modern transceivers...
I'd just like to measure the cabling first, instead of just hooking everything up and hoping for the best, every time.
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@acrow said in Not sure if good idea, bad idea or evil idea:
And by "site cabling", I mean mostly 3-wire power cables, but with a few ancient 20mA current-loop cables or other instrumentation cables thrown in.
I'm gonna go out on a limb and guess anywhere between .5 and maybe .75, but...
I'd just like to measure the cabling first
This.
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I have no idea where to put this, so I'm leaving it here...
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@Tsaukpaetra
Remind me in 12 days that I need to !!!SCIENCE!!! based on that image.Not the contents of the image, just the image file itself. Something is behaving strangely and I want to know why.
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@TwelveBaud said in Not sure if good idea, bad idea or evil idea:
@Tsaukpaetra
Remind me in 12 days that I need to !!!SCIENCE!!! based on that image.Not the contents of the image, just the image file itself. Something is behaving strangely and I want to know why.
Oh, you didn't know about the "Chrome forgets to rotate images if embedded" glitch?
Edit: It was mentioned here: https://what.thedailywtf.com/post/943750
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@Tsaukpaetra I knew about that one. I didn't know about the "Firefox forgets to rotate images if embedded" glitch, nor the "Trident-Edge forgets to rotate images if embedded" glitch. Though I wouldn't be surprised if those glitches were added "for web compatibility at the request of Google".
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@TwelveBaud said in Not sure if good idea, bad idea or evil idea:
Though I wouldn't be surprised if those glitches were added "for web compatibility at the request of Google".
Soon enough everyone will assimilate and forget the time before Google....
Edit: FWIW Internet Explorer also does this.
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@Tsaukpaetra said in Not sure if good idea, bad idea or evil idea:
@TwelveBaud said in Not sure if good idea, bad idea or evil idea:
Though I wouldn't be surprised if those glitches were added "for web compatibility at the request of Google".
Soon enough everyone will assimilate and forget the time before Google....
Ran into some folks who are fighting assimilation over on BoardGameGeek, where the revamped forum threads don't work right on IE. (BGG has been telling them it won't be supported.)
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@Applied-Mediocrity it's available on the switch? Not very potent then.
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I was going to suggest that it might just be a sideways image, but opening it in its own tab revealed that it actually is something to do with the embed.
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@hungrier said in Not sure if good idea, bad idea or evil idea:
I was going to suggest that it might just be a sideways image, but opening it in its own tab revealed that it actually is something to do with the embed.
Another one gets enlightened!
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@Tsaukpaetra :fa_samsung:
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@hungrier said in Not sure if good idea, bad idea or evil idea:
@Tsaukpaetra :fa_samsung:
Good idea! Someone visit this thread on their TV for science!
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https://www.youtube.com/watch?v=tyTTVuG6vcw
This demo runs on most phones
Footage captured from
RTX TitanSamsung S20+
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@Applied-Mediocrity said in Not sure if good idea, bad idea or evil idea:
Footage captured from
RTX TitanSamsung S20+And it's a whopping 12 seconds long (the 3D portion of that video, that is)! The new Samsung must be phat to stand that heat!
I'll have to upgrade my actively cooled, 60W chugging, GPU card soon. Lest I get taken over by a fanless blob.
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@JBert dietary experts are having heart attacks, everyone else cherishes.
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Anyone else get the urge to yell, "Cocksuker!" whenever they look at @apapadimoulis' avatar?
INB4: CoC-sucker
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@boomzilla said in Not sure if good idea, bad idea or evil idea:
Anyone else get the urge to yell, "Cocksuker!" whenever they look at @apapadimoulis' avatar?
INB4: CoC-sucker
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@boomzilla I would (currently) file that under "really bad idea"!
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@dcon Let's give him the title "God, Emperor and Tyrant".
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@Rhywden
So ... he is GET ? Approved!
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@Luhmann and let's give @boomzilla the title of Prime Overseer Second Tyrant!
Restful moderators. As in, very .
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@Gąska But who gets to be the Principal Unbiased Tyrant?
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@boomzilla said in Not sure if good idea, bad idea or evil idea:
Anyone else get the urge to yell, "Cocksuker!" whenever they look at @apapadimoulis' avatar?
INB4: CoC-sucker
Just makes me think of a crappy TV show from years ago.
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@loopback0 said in Not sure if good idea, bad idea or evil idea:
@boomzilla said in Not sure if good idea, bad idea or evil idea:
Anyone else get the urge to yell, "Cocksuker!" whenever they look at @apapadimoulis' avatar?
INB4: CoC-sucker
Just makes me think of a crappy TV show from years ago.
You should be thinking of a good TV show from years ago.
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@PleegWat said in Not sure if good idea, bad idea or evil idea:
Unbiased
sounds like a mission impossible around here
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@boomzilla said in Not sure if good idea, bad idea or evil idea:
You should be thinking of a good TV show from years ago.
Same actor, so not surprising that there's a mixup in some people's minds.
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@PleegWat I'm more worried about the Downright Evil Lord, Eminently Totalitarian Emperor
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@Rhywden said in Not sure if good idea, bad idea or evil idea:
@PleegWat I'm more worried about the Downright Evil Lord, Eminently Totalitarian Emperor
Why? Jeff left.
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That doesn't look appropriate...
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@CHUDbert said in Not sure if good idea, bad idea or evil idea:
That doesn't look appropriate...
You're right, let's get the man in the picture instead:
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@Tsaukpaetra
It doesn't help ... if gay dad let's go of the privileged baby it still smacks to brain damage ...
I did like to carry my daughter on my belly in a pouch thing in the first 18 months but once everyone is settled you don't have to hold the little pooper. She liked it as long as you didn't stopped walking around. If you stopped she would start crying ...
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Bit of all of the above in this:
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@boomzilla An excellent opportunity to install one of these!
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@Tsaukpaetra The Nope! thread is
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Somebody suggested me "Here's a fix for those working remotely who miss the ambience of the office"
https://www.youtube.com/watch?v=fuwGT88P-RU
One of the top comments:
ggg9ggg 10 months ago
I turn this up on my speakers and then put the noise cancelling phones on.
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@Tsaukpaetra said in Not sure if good idea, bad idea or evil idea:
@boomzilla An excellent opportunity to install one of these!
If you arrive at an unmanned highway stop and the only toilet hasn't been cleaned in two weeks, I'd probably still use the bushes.
Beyond that, no thanks.
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@boomzilla Just waiting for the house prices to plummet after all the newly vacant homes hit the market.
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@error Aren't we all? People looked at 2008, when housing prices came back down to reality, and far too many people in power said "let's reinflate the bubble back to delusional levels again!"
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@boomzilla If that sign (theoretically a good idea) is necessary, it's because there were at least two incidents…
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@dkf however, by putting up the sign they might just be giving ideas to people unaware of those incidents.
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@dkf said in Not sure if good idea, bad idea or evil idea:
@boomzilla If that sign (theoretically a good idea) is necessary, it's because there were at least two incidents…
Well, it's a university.
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@boomzilla said in Not sure if good idea, bad idea or evil idea:
Granted, "fastest growing" usually just means nobody is doing this. Or, one person did it last month, now it's two people this month. 100% growth!!!!!
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@error_bot xkcd fastest growing
Edit: fuck.