Beta
×

Welcome to the Slashdot Beta site -- learn more here. Use the link in the footer or click here to return to the Classic version of Slashdot.

Thank you!

Before you choose to head back to the Classic look of the site, we'd appreciate it if you share your thoughts on the Beta; your feedback is what drives our ongoing development.

Beta is different and we value you taking the time to try it out. Please take a look at the changes we've made in Beta and  learn more about it. Thanks for reading, and for making the site better!

Comments

top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re:flywheel (218 comments)

For the benefit of anyone reading, jklovanc is still talking out of his ass, but I've wasted too much time on this nonsense already. Goodbye.

3 hours ago
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re:Flywheel spin and political spin (218 comments)

You're correct, I was just using overly-simple wording trying to make sure my point got across. I often find it necessary to do so, here.

It would have been rather wordy to write it more pedantically... something about "adjusting combustion to increase/decrease the steam output to a turbine", and might have confused or detracted from the point I was trying to make.

yesterday
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re:flywheel (218 comments)

Look up the efficiencies of electric motors and water turbines. They are nowhere near 100%.

Of course I never said either was 100% efficient. Why you're wasting my time with volumes of mindless drivel, I may never understand.

Notice that it is in New York State so evaporation would be minimal.

New York State doesn't have any evaporation? I guess that must mean they don't ever get any rain, then. It takes a twisted mind to throw around accusations at others when you're completely ignorant of the topic.

The only link I can find that mentions efficiency of pumped storage is this one and it is a summary of all US pumped hydro storage.

And how does that, in your twisted mind, make the 87% figure less relevant? How is it that you're now just ignoring it, since it doesn't agree with you, and firing off a bunch more anecdotal numbers?

Don't you think that if evaporative losses were a big factor and easily remedied that these installations would not have done it by now?

Nope, there are innumerable reasons not to do so. Even 70% efficiency is pretty good with cheap electricity, and it's not a trivial effort to combat the evaporation, nor would it be popular with residents, and free of environmental consequences.

Helms Pumped Storage Plant is a power station that uses Helms Creek canyon for off-river water storage. It never was a conventional dam.

No? Everyone else in the world seems to think Courtright Dam and Wishon Dam are... wait for it... dams.

yesterday
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re:flywheel (218 comments)

Most of your sources that just state total losses and don't bother to separate out the evaporative losses, don't lend ANY support to your assertion at all.

Some you are using out of context... "something like 90%", "assumed" and "small amount" are obviously not meant as rigorous and exact figures, yet you try to use them as such.

Yelling without up backing you statement with references just weakens your case.

You never asked, nor even argued with my statement... You just acted like it didn't exist and then quoted more nonsense that doesn't speak to the issue either way...

How would you feel about a source for 87% real-world efficiency?

http://www.heco.com/portal/sit...

And as for conversions of dams to pumped storage, the first one that comes up:

https://en.wikipedia.org/wiki/...

yesterday
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re:flywheel (218 comments)

Most references to pumped storage efficiency refer to 70% to 85% efficiency.

...BECAUSE OF EVAPORATION (Which is something that can be addressed). Just like I said before... It's like talking to someone with a head injury that can't form short-term memories.

yesterday
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re: Flywheel spin and political spin (218 comments)

Try this one:

The main disadvantages of flywheels are the high-cost and the relatively high standing losses. Self-discharge rates for complete flywheel systems are high, with minimum rate of 20% of the stored capacity per hour. These high rates have the effect of deteriorating energy efficiency when cycling is not continuous, for example when energy is stored for a period between charge and discharge. Such high discharge rates reinforce the notion that flywheels are not an adequate device for long-term energy storage but only to provide reliable standby power.

Ref: Overview of current and future energy storage technologies for electric power applications (2008)
Ioannis Hadjipaschalis, Andreas Poullikkas, Venizelos Efthimiou

http://www.sfu.ca/~mbahrami/EN...

yesterday
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re: Flywheel spin and political spin (218 comments)

However, I've seen several local substation proposals for storing energy using banks of flywheels, and even more for rail.

Anybody can "propose" any ridiculous thing they want. It's a common trick for companies to say they're "working on" something that's going to be better than everything else out there. That's where the term "vaporware" comes in.

Point me to one single flywheel that can store energy without massive losses over the course of one day (on earth, not in space). All existing units are "for minute-to-minute fluctuations" and NOT longer-term energy storage.

yesterday
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re:flywheel (218 comments)

Even if you added another dam to catch the water it would decrease the efficiency of the original dam as the drop would be decreased.

Unless you dig a nice big hole at the bottom that can hold a day's worth of water. Then there's no loss of head pressure and plenty of water available to be pumped.

It's not like I imagined any of this. Dams ARE converted to pumped-storage.

at least 10% of the electricity is lost due to converting the electricity into potential energy and back again.

That's just a little bit high, but still a tiny fraction of the 35% losses previously stated, and much better than any battery technology plus AC-DC-AC conversion that exists today.

yesterday
top

Deputy Who Fatally Struck Cyclist While Answering Email Will Face No Charges

evilviper Re:Parallel "Nothing Wrong" case in VA (442 comments)

Except that in VA you are only allowed to shoot if you life is threatened, and not for the sake of protecting property. In no way did his daughter threaten his life.

That would matter if he shot someone in the back while fleeing with a TV, car, etc., or perhaps rigged-up a gun to his door to automatically fire (man-trap) or something. But when someone is breaking into your home, in proximity to you and your family, you have every right to assume they are armed and dangerous, and can shoot at-will. You are under no obligation to turn on the lights and visually confirm they are armed, or wait until they try to rush you, putting your life at serious risk, to confirm beyond a doubt that they are a danger.

yesterday
top

Deputy Who Fatally Struck Cyclist While Answering Email Will Face No Charges

evilviper Re:Conflict of interest... (442 comments)

District Attorney is an elected position, like many others. It doesn't matter what "house" they are in, as they can be kicked out on their asses like any other elected official.

Problem is, the opposite is reality. Most people are law and order die-hards, think police can do no wrong. They will support the DA's decision, and would have voted against him if he had prosecuted the police officer involved.

So, be careful what you wish for.

yesterday
top

Deputy Who Fatally Struck Cyclist While Answering Email Will Face No Charges

evilviper Re:Ridiculous (442 comments)

Apparently they totally failed to check whether the dude might have violated the law that says you should not kill people by driving over them with your car, which he obviously did violate.

There's no law against driving over people with your car, nor a law against killing people in general. If there was, law-abiding citizens would be jailed for shooting someone breaking into their home, police would be arrested every time they exchanged gunfire in self-defense, doctors would face life in jail every time they made a mistake, etc., etc. And specific to vehicles, you'd face many years in jail when a kid suddenly runs out into the street, or someone commits suicide by semi-truck...

There are laws against murder, though. And manslaughter. The later might sound like it would fit, but the standard it requires is depraved indifferences to human life, and just having one brief slip-up while looking down at your GPS, adjusting your radio, etc., isn't enough to qualify, unless you really take it to extremes.

yesterday
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re:flywheel (218 comments)

Pumped storage costs about $200 million per GWh of electricity stored to build.

But it's already built. Wherever there was a big river, dams have been constructed to take advantage of it, and they've been extremely profitable investments. Adding a pump to an existing dam to convert it to pumped-storage operation, is rather inexpensive.

the sunny parts of the US where large amounts of solar power are being generated are distinctly lacking in water to the point of being either deserts or often in drought conditions during the summer

Deserts are classified by rainfall, not available water resources. Las Vegas is a desert despite Lake Mead and Hoover dam. The Southern California deserts have lots of water available in aquifers, just not quite enough for the opulent water-wasting lifestyles of the astronomically huge population after several years of drought. Even Antarctica is a desert.

Pumped storage is also lossy, typically about 65% efficient round-trip.

The power loss is overwhelmingly because of evaporation from the dam reservoir. If you're building a dedicated pumped-storage facility, particularly in the desert, you simply need to cover it and you can get those losses down to next to nothing.

yesterday
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re:Yes, we know that. (218 comments)

Peak demand in California is between 6 to 7PM, peak solar production is approximately 12 noon.

You're apparently talking about PV. Solar thermal power production lags behind peak solar output by a bit, and continues producing a bit after sunset, much as air-conditioners do.

And in any case, you're oversimplifying it too much. The very peak of demand may be 6pm, but demand is very, very high for several hours throughout the afternoon, and tracks pretty closely with solar output...

yesterday
top

Power Grids: The Huge Battery Market You Never Knew Existed

evilviper Re:Flywheel spin and political spin (218 comments)

Substations convert and distribute 220 to your neighborhood, from high tension wires from the power plants.

Line voltage may even go up from 110

What are you, 200 years old? How are your carbon filament lights doing these days?

125V and 240V+ is typical US line voltage. If you're seeing 110V and 220V, your (knob and tube?) wiring is ready to catch fire...

Batteries are one method, but flywheels can work well, too. They could spin up a flywheel to consume the excess energy, then release it later as-needed (e.g. a dark cloud). In fact, they can spin up a flywheel at nighttime, too, when they have excess production, to smooth out daytime use

Bull. Shit. Flywheels store power for a few short MINUTES. There will be no energy left an hour later.

There have been promises of long-term flywheel power storage for many years, decades even, but they've never been able to get those magnetic bearings to work, due to pesky little eddy currents. Without that, you've got a big heavy wheel spinning around at high speed on ball bearings. Shut off the power to your clothes drier, and measure how long it keeps spinning... That's about how long-term flywheel energy storage works here on Earth. Go up into space, where there's no gravity or atmosphere, and it does a better job.

this infrastructure will smooth out their plants for normal use, too.

It could, but they'd be stupid to use it for that purpose. Grid losses average 7%. You get that much loss out of the AC-DC then DC-AC conversion, and possibly many times more losses out of the charging/discharging cycle losses of any battery chemistry... Meanwhile, speeding-up/slowing-down a turbine has little or no loss.

Localizing the storage is far more efficient than sending it hundreds of miles,

No, storage is vastly LESS efficient, and that's even if you pretend the infrastructure and maintenance is free. See above.

yesterday
top

New Computer Model Predicts Impact of Yellowstone Volcano Eruption

evilviper Re:Do they know more than they let on? (113 comments)

Wow ... there is a lot of talk about the Yellowstone volcano. Do the authorities know more than they are saying to the public? Why all of the sudden interest in Yellowstone?

Because people got tired of hearing about extinction-level asteroids... The Yellowstone Supervolcano was just the next ready standby to scare the public and get more viewers. I suppose it was the Y2K thing that taught the media herd that terrifying the public with BS is profitable, and they've kept it up ever since.

Sure, we've got Ebola now, but it's not as visual and a bit more mundane than the crazy and exotic ways to end civilization that the media finds most profitable.

yesterday
top

Raspberry Pi Gets a Brand New Browser

evilviper Re:Not the correct application for this (102 comments)

Firefox caches images and rendered pages so that things happen reasonably fast. A 1000x1000 colur image at 24 bit is already 3M.

Web pages don't usually have 1000x1000 images, with the exception of wallpaper sites, and people sure as hell don't keep 300 tabs open with those images, to justify Firefox using 1GB+ of memory and swapping to disk... Never mind the fact that Firefox could cache the compressed version of the images, and re-render that part of the page when the tab gains focus.

There is no way a modern page with an image or two would fit in a few M.

If we're going by Firefox, it seems there's no way a modern page or two will fit in a few GB.

many websites do pointless bloaty stuff and require scads of JS and huge images just to show some text.

Yes they do, but Firefox is smart enough to delay the loading of tabs until they gain focus, and could STOP the processing of all JS and unload decompressed images from cache when they lose focus again.

My browsing habits sure aren't to blame... I use NoScript and Adblock, too, and never have more than 20 tabs, and yet about every 8 hours I need to close Firefox because my 1GB of RAM is exhausted, and the swapping to disk is making my system unresponsive... This with the lightweight Fluxbox as my WM, and absolutely nothing else running.

yesterday
top

Raspberry Pi Gets a Brand New Browser

evilviper Re:Not the correct application for this (102 comments)

With some quality programming, the web browsers could use a fraction of the CPU power they do now by storing off screen graphics in compressed formats, for instance, especially since ending up with disk caching due to using up the RAM is far more resource intensive than decompressing images.

While the rest of your comment may be sarcastic, this is actually a very good idea. First, it is actually many, many times faster to recompute a value than to pull it from memory:

Jim Gettys: "There seems to be a common fallacy among programmers that using memory is good: on current hardware it is often much faster to recompute values than to have to reference memory to get a precomputed value. A full cache miss can be hundreds of cycles, and hundreds of times the power consumption of an instruction that hits in the first level cache."
http://lwn.net/Articles/188060...

Secondly, even if we're talking about content that isn't already available in compressed form (which most web content is), there are simple compression methods like LZOP, where the extra CPU overhead is still faster than the increased amount of I/O needed to transfer the equivalent amount of uncompressed data.

"lzop is usually IO-bound and not CPU-bound"
http://www.lzop.org/

Frankly, I'd be happy to turn off all Firefox caching if I could... I never open more than 20 tabs, and certainly not with huge images, yet on my 1GB system, Firefox starts causing swapping to disk after every 8 hours or so, and needs to be restarted, and I certainly don't buy the cop-out that my add-ons (Adblock and NoScript) are to blame, while Firefox would be perfect otherwise. And this is with the LTS/ESR version, which is supposed to be the super-stable version.

yesterday
top

Russian Military Forces Have Now Invaded Ukraine

evilviper Re:Inevitable (832 comments)

Make all the noise you want... Obama has still done the job better than Bush could claim, and the results show that, undeniably. Bush was no deterrant, and utterly toothless in the face of Russians invading a neighboring country. I expect Obama will handle Ukraine much better.

It makes perfect sense for you to bring McCain into this... Since he's never been in-charge, you can make up your fantasy world about his presidency, unconstrained by pesky little facts and actual actions and results.

2 days ago
top

Russian Military Forces Have Now Invaded Ukraine

evilviper Re:Inevitable (832 comments)

Georgia was undermined by Obama's *removal* of sanctions in 2010 despite continued military occupation.

It was still invaded under Bush. The Russians could not have known what Obama would or wouldn't eventually do. Clearly, there's nothing special about Obama that makes Russia think they can invade countries with impunity, despite your talk-radio nonsense claims.

2 days ago

Submissions

top

Low Power Monochrome LCD screens

evilviper evilviper writes  |  more than 5 years ago

evilviper (135110) writes "Ever since I picked up my Psion 5mx handheld many years ago, I was impressed all-around with the clarity and amazingly low power requirements of simple monochrome LCD screens. I didn't even find myself missing color. Now, I find myself tasked with replacing hundreds of dumb terminals with surplus PCs, doing nothing at all but running a simple terminal emulator, and wasting power. With the majority of power being drawn by the monitor, and requirements so modest that switching to a grayscale display would go practically unnoticed, naturally, my mind goes back to those inexpensive and power-sipping monochrome LCD screens. Sadly, all I've found in my searches are old CRTs, and very expensive high-end LCDs for medical imaging.

So where can decent-sized monochrome LCD screens (preferably with VGA connectors) for PC output be found? Even a text-only screen, ala. digital watches, might be acceptable. I'm sure I'm the only person to ever have this need. What do others in similar situations do to reduce the power consumption of largely idle PCs that are needed merely as a small upgrade from dumb terminals?"
top

Cellphone Signals Used to Track Traffic Patterns

evilviper evilviper writes  |  more than 6 years ago

evilviper (135110) writes "Engineers at the Indiana Department of Transportation have developed a method to track how long it takes vehicles and pedestrians to travel from one point to another. "Now we have a way to measure how slow traffic is on a given stretch of road or how long it's taking people to get through airport security at a given concourse and time of day." Data from such a system would provide not only information about short-term factors such as congestion from construction work zones, but also long-term trends requiring design changes.

Research findings will be detailed in a paper appearing in the June issue of the Institute of Transportation Engineers Journal. The researchers have filed a patent on the method, and the basic technology is available commercially to create the tracking system.

(apologies for the previous submission lacking URL)"
top

Cellphone Signals Used to Track Traffic Patterns

evilviper evilviper writes  |  more than 6 years ago

evilviper (135110) writes "Engineers at the Indiana Department of Transportation have developed a method to track how long it takes vehicles and pedestrians to travel from one point to another. "Now we have a way to measure how slow traffic is on a given stretch of road or how long it's taking people to get through airport security at a given concourse and time of day." Data from such a system would provide not only information about short-term factors such as congestion from construction work zones, but also long-term trends requiring design changes.

Research findings will be detailed in a paper appearing in the June issue of the Institute of Transportation Engineers Journal. The researchers have filed a patent on the method, and the basic technology is available commercially to create the tracking system."
top

evilviper evilviper writes  |  more than 7 years ago

evilviper (135110) writes "Everyone's favorite company (SCO) is now distributing everyone's favorite GPL'd Unix video program (MPlayer) for their UnixWare and OpenServer operating systems. With it, they are including numerous codecs in the form of Windows DLLs, from Microsoft, Apple, RealNetworks, and others. This brings up numerous questions about the legality of re-distributing freely downloadable files, and the enforceability of EULAs on the related software. It also raises the question of whether the GPL extends to closed-source, binary code being loaded by GPL'd programs at runtime, such as DLLs or Linux kernel modules.

http://www.heise.de/newsticker/meldung/88956
http://www.sco.com/products/docs/MPlayer%20for%20U W714%20&%20OSR6-FINAL.pdf
http://www.sco.com/support/update/download/release .php?rid=270
http://www.sco.com/support/update/download/release .php?rid=271"

Journals

top

FTA Satellite Reception in North America

evilviper evilviper writes  |  more than 6 years ago

If you live in the western US, more than 100 miles from a major city, over-the-air TV can be very limited, available only via a weak signal, or entirely unavailable. There, your only choice is satellite.

DBS vs. FTA
The question is, do you want to pay $50 a month to a direct broadcast satellite (DBS) service like DirecTV and Dish, or do you want to be free? DBS providers will give you a large number of channels, but I find 95%+ of my TV viewing is shows available on local broadcast channels anyhow. That leads us to free-to-air (FTA) satellite.

Over in Europe, Asia, Africa, there are a large number of channels broadcast unencrypted. The western US, however, is the absolute ass-end of the world... separated from the rest of the world by the two largest oceans in the world, and, with such a minuscule population density that practically nobody is interested in serving the area. See previous point about TV reception.

FREQUENCIES/LNBF
Point being, with FTA in North America, there isn't a big selection. As a rule of thumb, as an English speaker with a KU band receiver, you can really only expect to get PBS, news, and shop-at-home channels. Things get more interesting, however, in the C-band... There you have a much larger selection of channels, intended to be picked up by cable companies and the like, and include all the major broadcast networks. Even though just about all growth is in the KU band, it's clear there is still a lot of life left in the C band. I recommend a dual, C/KU LNBF. You really don't even need to worry about noise and gain figures for LNBFs these days, unless you're looking to pick up seriously fringe signals.

PICKING A DISH
The second issue is size. I don't consider a dish a good purchase if you can't take it with you when you move elsewhere. The only way to guarantee your future land-lord/neighborhood association/etc. absolutely can't forbid you from installing a dish is to follow FCC rules and buy one that is no larger than 1 meter in diameter. Fortunately, this isn't 80s technology anymore, and 1 meter is perfect sufficient for C-band reception. Furthermore, you can get just a bit more signal if you go with an offset dish, rather than an old, standard, parabolic dish, as the LNBF is not located where it blocks signal reception. Since you're size-limited, it's better to buy an offset antenna, and get the maximum amount of signal possible. In most cases, there is effectively no price difference.

RECEIVERS
Analog has nearly gone the way of the dodo. 4DTV/VideoCipherII is popular in North America, and a good option if you want to get all the standard "cable" channels (for a lower price than cable or DBS, but otherwise, there's practically no FTA content, so it's quite safe to skip it. That just leaves one option, the one that has quickly taken over most satellite transmissions, worldwide: DVB-S... For about $40, you can get a nice PCI DVB-S card, and turn any old PC into a TV tuner, or DVR. But, if you're not very technologically competent, there are also $150 "FTA receiver" set-top-boxes that will do the job as well, if less flexibly.

ENCRYPTION
Though I'm really not interested in it myself, I should at least mention that FTA is commonly used as a euphemism for illegally descrambling encrypted satellite TV signals. Now, DirecTV and 4DTV broadcasts are immune, partly because they are proprietary, and relatively few people have interest in. Dish Network, however, uses standard DVB-S equipment, and NagravisionII encryption, which can be decrypted with "softcam" programs that are available. Of course these things are difficult to find, due to the risk of lawsuits under the DMCA, but "softcam" software certainly exists both for computers (Windows and Linux) as well as "unofficial" firmware for damn near all "FTA" receivers. Yes, it is a bit of a shell-game, and no doubt the vast majority of FTA sales are based on this.

CHANNEL GUIDE
To see what satellite signals are freely available to you, visit lyngsat: http://www.lyngsat.com/freetv/United-States.html

Just be sure to take that listing with a grain of salt... Sometimes, that list shows signals available that are actually from satellites on the opposite side of the planet (see: Playboy One).

EQUIPMENT
You'll also need standard equipment like a dish rotator, that is strong enough to hold the weight of the dish, and communicates with the receiver in some standard they both understand, but that's pretty straight forward to check on. Not to mention good quality coax cable, and absolutely no splitters in-line, or else you'll cause some serious damage.

INSTALLATION
Buy a compass, and mount your dish so it has a perfectly clear view all across the southern horizon... If there's a tree or a building in the way, you've got almost no chance of getting any reception at all. You can mount it to your roof, or to the ground, but either way, make sure your mount can handle hundreds of pounds of force, without the dish shifting even a fraction of a inch, otherwise you'll have picture drop-outs when it's windy. Manage all of that and, barring heavy commercial air traffic, you should get a perfect signal, all the time. The dish is far larger than it needs to be for KU-bands, enough so "rain fade" shouldn't occur in even the worst storms.

Hopefully this was helpful for those of you considering purchasing a satellite dish. If you still have any questions, feel free to ask in the comment section.

top

HDTV Reception: Everything You Need to Know

evilviper evilviper writes  |  more than 6 years ago

Both ignorance and misinformation abounds about the coming switchover to HDTV in the US. I will cut right to the facts.

Right now all major TV stations have two transmitters, their old/original, and a new, secondary for their DTV broadcasts, which is always lower power, on UHF. As of February 2009, they will be shutting off one of the two, and broadcasting digital-only. The FCC has allowed them to select which of the two they wish to continue using. At this point, it's largely settled. VHF-low is going away.

ANTENNA SELECTION:
Practically all broadcasters on VHF-low (channels 2-6) are dropping their existing channel assignments, and switching to a higher (UHF) one. There are very few exceptions. There are also (much lesser) signs of broadcasters leaving VHF-high (7-13), but for the time being, there are lots of VHF-high channels, so you will need an antenna that can receive channels 7-13.

Also important is the fact that ATSC doesn't handle multi-path interference (ghosts) very well. Unlike current analog NTSC, it won't just make the picture look worse, if it's significant, it will prevent you from getting a picture at all. If you are in a city with tall building or big hills/mountains around, this is very important in the selection of an antenna. Older and more common (rectangular) VHF antennas are less directional, and can do little to suppress multi-path interference.

Also important: The FCC is removing UHF channels 52-69. There will no longer be TV broadcast in that range.

STRONG SIGNAL (0-20 miles):
If you are just a few miles from all the TV stations you want to receive, and there are no obstructions in the way, you would probably do well to just get a TV-top antenna that does both VHF and UHF (rabbit ears for VHF and a loop or bow-tie for UHF).

MEDIUM SIGNAL (20-40 miles):
If you use an older rectangular VHF antennas, multi-path interference on VHF signals can pose a problem. Don't get an antenna that is large, and/or highly directional with high gain (db) or else it will be unnecessarily difficult to install and aim the antenna. Hopefully all the channels you want to watch are coming from the same general direction, otherwise, you'll need a (low-end) antenna rotator to get a good signal or possibly two antennas pointed in different directions. I suggest a Winegard 4400 (4-bay) for UHF, and possibly an AntennaCraft Y5-7-13 for VHF-hi. To connect them, DON'T USE A REGULAR SPLITTER or you'll ruin your reception for no good reason. You want a $2 UHF/VHF combiner, commonly made by Pico Macom/Blonder Tongue/Holland/etc.

WEAK/FRINGE SIGNAL (40+ miles):
The most popular type of UHF antennas, yagis with corner reflectors (they look like big metal arrows), design is such that they perform poorly at lower UHF channels, and best at the highest UHF channels. One of the antennas I was considering buying only starts to perform well at UHF channel 50, channels which won't be around in a year.

With that in mind, I recommend an 8-bay antenna instead... One of the top performers which is also far less expensive than other 8-bay antennas is the Winegard 8800. 8-bays perform quite well at the lower range of UHF frequencies from 14 to 50. A few 8-bay antennas claim to get good VHF performance, but it's all misinformation (which I also fell for). At best, they only barely outperform the most basic rabbit ear designs, If you're far enough from UHF stations that you need an 8-bay, you'll also be far from VHF stations, and need a GOOD VHF antenna to bring in the signal. A barely-capable-of-VHF 8-bay simply doesn't have enough gain to get decent VHF reception. A $20 VHF-high antenna will blow them all away. Use a VHF/UHF combiner, NOT a standard splitter to connect them.

VHF-hi needs much smaller and cheaper antennas, and VHF-low is almost gone, except in Alaska, where stations are keeping their low VHF stations due to terrain.

There's one other advantage that multi-bay antennas have over yagi/corner reflectors. If you are renting an apartment, you are allowed to install any antenna you want, provided that it resides entirely on your property. Being able to mount a long yagi/reflector without it sticking out (no longer your property) is pretty unlikely, unless you have a huge balcony. Multi-bay antennas are quite flat, and even just an outside window ledge could be used to mount it legally. Just make sure it's mounted securely, because they are heavy. If there's no location for installation outdoors, you could also install it on the inside of a window, facing out, perhaps hidden from view by your curtain... a yagi would have to stick out, halfway across the room.

INSTALLATION:
There's no substitute for putting your TV antenna on a nice long pole, hooked up to your HDTV tuner, and walking around your house with it until you find a location that gets a strong signal on all the channels you care about. A simple procedure, but a lot of time-consuming work. An antenna can be mounted up to 12' above the top of your roof without requiring you to apply for any permits, and in general, the higher your UHF antenna is, the stronger the signal.
Stay far away from power lines. Be sure to ground both the antenna pole and the coax cable outside of your house to prevent lightning damage.
Large multi-bay antennas are very heavy, so be sure to get heavier gauge pipe for mounting it.
If you are in a fringe area, and your cable runs aren't pretty short, you'll need a mast-mounted signal preamplifier. Lower noise (2.0db) is better, and only slightly more expensive than the rest. Gain (eg 15db) will hardly be an issue UNLESS you have extremely long cable runs... Only then, a second amp might help.

I'm looking forward to HDTV, not for the resolution, but because 95% of the shows I care about are on broadcast TV, and signal quality (fringe area) is the only reason I consider cable/satellite. DVRs, Netflix and Hulu obsolete most of the need for cable, and the sudden and total deterioration of the quality of original programming on the major cable networks sealed pay-TV's fate, IMHO.

If you still have any questions about the basics of digital TV, feel free to leave a comment, and I'll get to it. Coming up next time (soon!) similar tips for satellite reception...

Sources:
FCC DTV tentative frequency assigments: http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-06-1082A2.pdf
Antenna performance comparison: http://www.hdtvprimer.com/ANTENNAS/comparing.html

Products Linky:

UHF/VHF combiner: ... Pico Macom "Tru Spec" UVSJ

Winegard UHF 4-bay 4400: http://www.solidsignal.com/pview.asp?p=hd-4400&d=winegard-hd-4400-4-bay-uhf-prostar-1000-high-definition-tv-antenna-%28hd-4400%29

Winegard UHF 8-bay 8800: http://www.solidsignal.com/pview.asp?p=hd-8800&d=winegard-pr8800-8-bay-uhf-prostar-1000-high-definition-tv-antenna-%28hd-8800%29

AntennaCraft VHF-hi y5-7-13: http://www.solidsignal.com/pview.asp?p=y5-7-13&d=antennacraft-by-radioshack-y5-7-13-highband-broadband-vhf-yagi-tv-antenna-for-channels-7-13-%28y5-7-13%29&sku=716079000987

AntennaCraft VHF-hi y10-7-13: http://www.solidsignal.com/pview.asp?p=y10-7-13&d=antennacraft-by-radioshack-y10-7-13-highband-broadband-vhf-tv-antenna--%28y10-7-13%29&sku=716079000994

top

Xiph.org run by trained monkeys...

evilviper evilviper writes  |  about 9 years ago

It has to be said... It's clear Xiph.org is run by trained monkeys.

I was subscribed to the theora mailing list for a very long time. Recently, I tried to send a message to the list, only to find it rejected because my IP (on which I run my personal SMTP server) is dynamic. Don't ask why I don't use my ISP's SMTP server, that's an argument for another time. Suffice it to say that I'm stuck with this arrangement, and quite happy with it.

Finding that my posts were not welcome (and angry that Theora is at least 3+ years behind schedule) I decided to unsubscribe and wash my hands of it. Guess what? majordomo@xiph.org is subject to the same IP filtering... I guess they don't want their bots to waste time reading spam... So, of course I use the web-based interface, and unsubscribe.

Figuring someone at xiph.org would want to know about this, I e-mail Monty. Sadly, Monty's address is subject to the same filtering as all other addresses at xiph.org. I do what any nerd would, look up the whois information for xiph.org. "Great honeybee of infinity" the contact info for the xiph.org domain is monty@xiph.org.

So, that is why I've come to the conclusion that xiph.org is run by trained monkeys. These are the people we're supposed to depend on to give us the next-gen free audio/video standard? I still like Vorbis, but I've lost all faith in Theora.

Comments welcome.

top

Low-power CPUs

evilviper evilviper writes  |  more than 9 years ago

I've decided to split this issue into two parts... First: CPUs.

People like to complain... A LOT... that modern CPUs are too hot. While I agree to some extent, the fact is, you just need to be more knowledgable, and you can still get very high-end CPUs with very low power requirements.

Because people have varying needs, I've included processors of many different speeds, and varying power requirements. The only rule is that they have to stand-out as significantly lower power than similar processors.

I include both Intel and AMD chips. I do not include VIA processors, because their performance is quite terrible, and their power requirements not all that low. And most importantly, I am listing desktop chips only, not mobile processors.


Proc Model Max
K6-2-400AFR 16.9W
PIII-800 (6-B-x) 10.63W
Athlon 6-8-1 XP-1600+ 48.5W
Opteron-140 (1.15V) 30W
Athlon 64 (1.0GHz 1.1V) 22W
Sempron (1.0GHz 1.1V) 20W
Athlon 64 FX (1.2GHz) 25W
Xeon-1.6G LV 30W
Athlon 6-A-0 XP-2000+ 60.3W
Sempron 6-A-0 3000+ 62W

BTW, that was a very nice looking table before Slashcode chewed it up, and stripped important info for no particular reason.

Anyhow, processor selection is only about 1/3 of the battle. The even more important issues is power draw, and power management of your motherboard. Unfortunately, neither one is publicly documented, nor are the manufacturers willing to release ANY information at all when I requested that they do so. So, it's very tricky.

top

Cheap Computer Cooling / Silencing

evilviper evilviper writes  |  more than 9 years ago

Computers don't need to be LOUD at all, and you don't need to spend hundreds of dollars to get them running near-silent. You also don't need to sacrific cooling to get quiet.

The problem is a simple one. Computer manufacturers use the cheapest heatsinks and fans they can buy, that will move enough air to adequately cool the system. This results in a savings of about $2 for them, and a lot of noise for you. It's easy to fix this, although it will cost a bit more than $2 to do it after the fact.

The first thing to do is to replace your heatsink. It's probably 60mm in size, with ultra-thin fins, thermal tape, and a tiny bit of space between the fins, such as this one. There are numerous alternatives. The main things you need is plenty of space between the fins, and the ability to accomodate an 80mm fan. You can find one for under $5. I would personally recomend the Thermalright ALX-800, which is easily found for $16 or less.

Install this new heatsink, but for the love of all that is holy, do not use thermal tape. It is unbelievably terrible. Using thermal paste (eg. Arctic Silver 5) will keep your processor a good 20 degrees cooler, with no other changes made.

Alternatively to a new heatsink, if your 60mm one is pretty good, you could just grab an 80mm to 60mm 'fan adapter', for about $2. I recomend buying a larger heatsink in almost all cases though.

Now, there is one fan that stands above all the rest... The Enermax 80mm. It is thermo-controlled, so it will be incredibly quite when your system is cool, and only slightly noisy when your system is very hot. Plus it's just a very quiet fan, that is cheaper than any out there. They are as cheap as $3.50 each (free s+h) if you buy 10 or more: from newegg.com. If you want less than 10 (why?), newegg's shipping prices are outrageous, so you'd be better off buying from: bestbyte.net. or you could use froogle.com, and maybe find them cheaper (not likely though).

These fans need to replace all the others in your system. Your CPU fan, your case fans (if any), and most importantly, your power supply fan. Unplug your power supply from everything before opening it up. You'll have to cut the wires going to the original fan, and leave them several inches long. Cut off the connector on the new Enermax fan, strip both pairs of wires about an inch from the end, and twist them together. Using a few rounds of electric tape will be enough to hold them together... Just make sure you route the wires so the tape won't be resting on the heatsink. It won't likely melt through the tape, but it's a chance I do not want to take.

If your soldering skills are good, I would suggest getting a 2 or 3 prong connector, and soldering it to the power supply. You can just use the connector on the molex adapter that comes with each of the enermax fans. Desolder the two leads going to the original fan, but mark which is positive/negative, and solder the 3-pin connector in there, with the correct polarity. Just cut the 3rd pin, since it's of no use.

These fans are almost the exact ones used by Enermax in it's own power supplies. Enermax has a reputation of having high quality and quiet power supplies, and now your cheap power supply will be just as quiet as an Enermax.

Connect all the fans, and turn on the system. Suddenly, the noisiest component in your system will be the hard drive. You'll still be able to hear the fans--no fan can be completely inaudible--but I can assure you they will be just as quiet as you've dream they would be.

I do not buy ANYTHING except thermally-controlled fans, for very good reason. Not because they are quiet when your system is running cool, but because it almost guarantees your system will never overheat. I live in the desert where tempuratures reach 130F degrees, and without any airconditioning at all, my systems all remain up and running, all day, every day. A half-dozen computers is a huge source of heat, but the CPUs in my systems still never get over 120F degrees (indoor tempuratures don't normally exceed 95). Not only is my solution very quiet, and very inexpensive, but it is also far more heavy-duty than the cooling system you have now. It should keep even the hottest CPUs from overheating, in abient tempuratures higher than the hottest recorded tempurature on the face of the Earth. Just as long as your system isn't in direct sunlight, it will stay cool and quiet.

This solution has more than pacified me in my search for silence. The noise from my CPU/PowerSupply/Case -fans is no longer an issue. Hard drives are getting less noisy every generation, so they won't be an issue once I upgrade my oldest (40GB) drives. The incredible noise from my DVD-ROM is another story!!!

My next journal entry will be on cool-running, yet fast CPUs and motherboards. Somewhat related to my former story on AMD power management/S2K. Expect it to appear within a week for your reading pleasure.

top

What you need to know.

evilviper evilviper writes  |  more than 9 years ago

For many years, I've followed a lot of stories about law enforcement, privacy issues, and your rights. After seeing how law enforcement in the USA works, I think it's quite important for EVERYONE to know just one thing... From years and years of my own experiences, I can tell you it's the only way to operate.

Do everything by the book. Go through official channels. Volunteer absolutely nothing.

I know it may sound like something you'd hear from a career criminal or a crazy privocy advocate, but I'm neither. It's just how things work in the real world.

For instance... All the time I hear stories of someone who gave their boss an ultimatum. Perhaps their boss is doing something illegial, immoral, or just in conflict with company policy. What inevitably happens, is that their boss swears he will repent, and change his evil ways. This only serves to placate the complaining employee, and keep them from complaining through official channels. While that's happening, their boss is very busy, scheming to counter the threat. What they do is what the employee should have done... The boss goes through official channels, filing complaints against the employee, claiming anything from harassment to incompotence. In one instance, I've even heard of a boss later telling the employee they can have some time off, but never filing the proper paperwork, and denying that the conversation ever took place. This all culminates in firing the employee, and setting yourself up with a made-up reason the employee might hate you, and be willing to make-up a story to hurt their (former) boss. This obviously could have been avoided if the employee wasn't quite so considerate, and sheepish. If you go through offical channels, this will not happen. Another good lesson in this is that you should not do anything significant, strange, etc., without having it in writing. If you are getting extra time off, make damn sure you have a copy of the request form, or whatever your company happens to use.

What police do really concerns me the most. Whenever they suspect you of doing something illegial, but don't have enough for a warrant, they will try to con you into letting them search. Most commonly they say they'll be nice to you, if you are nice to them. Sounds good in theory, but once they get what they want, you can bet they won't be doing you any favors at all. Less often, I hear about police that ask to search your home or vehicle, saying they don't care about anything illegial you might have, they only want to see if there's someone or something they're looking for. Of course, once you give them permission, and they stumble on to something illegial, they'll take you in. It's probably on their vehicle cameras, but even if it's brought-up in court, the fact is, they can lie their asses off with no consequences. Once you try to help the cops out a little, and volunteer to anything, they've got free reign, and no matter what they told you before hand, they are going to use it.

In addition, there may be built-in privacy or other types of limits in the laws, that don't apply when you are scammed into volunteering. Going back to the house search senario... If you volunteer to let them look through your house for, let's say, a suspect, and they get nosey and decide to look through your dresser drawers, where they find drugs, or perhaps a gun that is not registered in your name (they check gun regs. before they enter your house, of course) then they will take you in on those charges, and everything will be admisible in court. If you did everything by the book, they would have had to get a warrant, and it would have had to specify that they weren't looking for weapons nor drugs, then they couldn't pull tricks like that on you.

Let's cover this by a much different senario. DNA and privacy. Lots of DNA dragnets are happening, so it's a very relevant subject. Let's say you are asked to volunteer DNA, and they threaten to arrest you, or just give you a really hard time if you don't cooperate. Well, the rules are completely different if you volunteer. If they go through the trouble of getting a warrant, then force you to give DNA, there may be rules in your locale that don't allow them to check those results against any case other than the one specified, and prevent them from revealing that DNA info to anyone. Lots of people are concerned that their insurance company will find out that they are pre-disposed to develop a certain disease, and silently revoke their coverage. It's a very real threat, since there have been cases brought to court of it happening.

Protesters are being forced to get smarter about their rights, because police have been very sneaky. They can ask you for your name, or more often ask for ID, and then find out if they can put together any reason to arrest you. You have no reason to give them your name, unless you were pulled-over while driving, or after you've been arrested. Before then, just say no, or even make-up a name... It is your right. I've never been a protestor, but around here, it's not too hard to be in a bad place, and look suspicious. I've had cops ask me for ID. I happily shake their hand, and introduce myself, by first name only. They can be persistant, but you don't have to give them anything. Even if you give them your ID only because they said they'd arrest you otherwise, they were lying, and you just volunteered information. Now, you migh be arrest for something as simple as an unpaid speeding ticket.

Volunteering for anything only does bad things to you, and never anything good. No matter what anyone promises you, don't believe them. Go by the book, don't volunteer anything.

Even if you aren't a protestor, nor a minority in a white neighborhood, nor look homeless, these are important rules to live by, and you'll get screwed over every time you don't strictly follow them.

Although I have not experienced most any of these senarios, I do directly know people who have, and I've been in less serious situations where I got "the short end of the stick" as they say.

Now, since you might not see how it applies to the situation you are in, let's expand on the rules to live by.

Always go by the book, and follow procedures in-order, and don't skip anything.

Volunteer no information to anyone. Looking or sounding suspicious is no crime.

Get everything REMOTELY important, in writing.

If admitting guilt, be VERY specific about what you did, and what you don't admit doing.

Don't sign anything that you have not read fully and very carefully. Be very supicious of pressure.

There is no such thing as a "standard form", you are going to get screwed if you just sign.

Even if someone sounds like they are trying to be nice, be VERY skeptical of their good intentions.

I welcome everyone to add their own comments here. Either if you'd like to add to these rules, or have your own experience to share.

top

AMD CPUs Power Management Problem...

evilviper evilviper writes  |  more than 10 years ago

A person can only hear "bullshit" so many times before getting annoyed, and doing something about it.

I found, from the replies to my recent post that there is a startling lack of knowledge about AMD's power management issues with their CPUs. Since there is such a lack of knowledge, and even more a lack of belief, I thought I go through the issue, in good detail, right here.

With all PCs, your OS sends a HLT instruction when it doesn't require all the processing power your CPU has to offer. On an Intel chip, this will quite simply cause the CPU to draw less power, and put out less heat. As a matter of fact, the difference in tempurature and power usage is very significant. Unfortunately, this does not happen on AMD processors.

The problem with AMD, is that the processor will not do anything with those HLTs, unless the northbridge disconnects. The northbridge, unfortunately, won't disconnect. So, your AMD CPU, even when idle, will not lower it's tempurature, or power usage.

A common rant I heard in several replies was people saying that their CPU tempurature did drop when it was idle. Well, yes, that's true. Even an AMD CPU will use slightly less power, and slightly drop in tempurature when it isn't being fully utilized, but the change is seriously insignificant. People have just gotten used to the fact that fast CPUs are incredibly hot, and don't realize that they should be seeing an incredible drop in tempurature and power usage, not the tiny change they currently get.

So, as I was saying, the Northbridge doesn't disconnect, and the CPU doesn't idle itself because of it. Well, there is a register (in the Southbridge) that will cause the northbridge to disconnect. It's known as the "S2K bus disconnect" bit (no relation to Y2K). What AMD expected was that motherboard manufacturers would enable that register in the BIOS, and everything would be good. However, practically none of the manufacturers paid any attention, and didn't set the register. AMD wasn't all that bright, in that they registered hundreds of chipset for use with AMD processors, even though they didn't set the S2K bit, and hence caused the processor to run much hotter, and waste lots more power.

Well, with processors running even hotter now, and using up even more power, AMD announced that they won't certify any chipsets as Barton-compatible, unless the BIOS sets the S2K bit. So, should you buy a shiny new motherboard to significantly lower your heat output and power draw? No, you probably don't need to... This can be done by software.

FVcool is a very good program for Linux and the BSDs. It does not work with every system on the planet, but if it does work, you'll see serious power savings. Be sure you apply the patch on the same page to FVCool v1.03, otherwise you're likely to have audio problems. You really should Download and try it. If you run a Windows machine, you can use VCool, although the power savings, even in an idle loop, won't be as significant as with fvcool on Unix.

Thanks to /.er gid (who also didn't believe me initally) we have a graph of CPU tempurature to prove the point. You can see that he started using fvcool on his system on Tuesday the 4th, just after 20:00 (8:00pm). There is a very very stark contrast before and after he started using it. And as significant as the difference in tempurature looks, the difference in power usage is even more impressive... My 90watt system drops to under 50watts when running FVcool. That is a serious power savings, and the drop in tempurature is more significant here in the desert where I live. The cost of powering a system that doesn't idle properly, and the cost of air conditioning to cool down the system that is running too hot, gets to be a very expensive proposition.

Now that I'm done praising the advantages of idling your processor, I have to spend some time complaining about AMD being morons. They did not require chipsets to enable S2K bus disconnect, wasting untold ammounts of power for many years. And even though they've done this now, their method of idling the processor is really quite bad... Intel chips do not require the northbridge to disconnect, and I must say, that's the way to go. When the northbridge has to disconnect, you certainly run the risk of having all sorts of things going wrong with your system. Corrupting or distoring video and audio is a common problem. Network connections being disabled is a very common problem. There is also the potential for systems freezing, or ATA/SCSI controllers failing in obvious or subtle ways.

I don't want to scare you away from using fvcool... The chances that you will have a serious problem with it are slim. However, I just have to point out that all these problems are caused by AMD simply being moronic about processor design. If they had just let the CPU idle down when it recieves a HLT, regardless of the state of the northbridge, AMD systems would have been running far cooler for many years, all without a single one of the problems described above.

If you'd like to read more about the issue, the writer of VCool has provided a very good page detailing it.

top

WARNING! Javascript is the root of all evil! ALERT!

evilviper evilviper writes  |  more than 10 years ago

You are probably here because you clicked on my sig.
You want to know why javascript is awful and should be disabled by everyone.

The link below is to a page that uses some very simple javascript code to repeatedly open up an intifinte number of windows. In those windows are some disgusting images, which you will want to close as quickly as possible. Javascript has taken control of away from you, and will not allow you to leave without a fight.

So, if you are smart, you will disable javascript on all web browsers you have access too, and tell all the websites you visit that you are unable to use their javascript features, which are always pointless, and would be implimented much better without the use of javascript.

Very well... You have been warned. So, without further delay, here is THE LINK!!!

top

According to O'Reilly, My Name is "Some"

evilviper evilviper writes  |  more than 11 years ago

Hmm, after reading an interview with Alan Kay, I made a couple comments that criticized him (and others) for complaining about the current state of computing , but not saying specifically what it is that we should have:
http://slashdot.org/comments.pl?sid=59688&cid=5667893
http://slashdot.org/comments.pl?sid=59688&cid=5670250

Today, I read an O'Reilly article which said (and I blockquote):

Some have criticized this interview because Kay points out the things that are wrong, but doesn't really offer solutions for correcting them.

http://www.oreillynet.com/pub/a/network/newsletters/20030408.html

I don't find anything wrong (or right for that matter) with the article, I just find it to be another interesting note on how far words on slashdot can carry.

This is the second event that belongs in my personal slashdot scrapbook of world impact (well, second under this username). The first being my solutions to the problem of unreachable DNS servers (which Sam later implimented into MaraDNS) http://slashdot.org/comments.pl?sid=50447&cid=5063639

I find the first to be much more impactful on the world (I'm convinced it will end up in other DNS servers, and eventually into an RFC), but for some reason, I find this recent one to be much more curious.

Slashdot Login

Need an Account?

Forgot your password?

Submission Text Formatting Tips

We support a small subset of HTML, namely these tags:

  • b
  • i
  • p
  • br
  • a
  • ol
  • ul
  • li
  • dl
  • dt
  • dd
  • em
  • strong
  • tt
  • blockquote
  • div
  • quote
  • ecode

"ecode" can be used for code snippets, for example:

<ecode>    while(1) { do_something(); } </ecode>