I think GrangeBand is a software application for creating music that lulls cows into a false sense of security so that you can run up to them and push them over. Search for it on SourceForge or FreshMeat.
Why have you only quoted low switching IC's to me. I don't want IC's I just want transistors and diodes.
My pre-submit post said that I don't remember transistor and diode circuit design that well. I know those datasheets have schematics, and I remember going through them in college to identifying what transsitor/diode did what.
If you find an old version of TI's TTL Databook, you will see the schematics for the various devices. You should be able to find scanned PDF versions on TI's website.
IIRC, 74LS00 was the quad NAND, 74LS08 was the quad AND, 74LS02 was the quad NOR, 72LS32 was the quad OR, 74LS04 was the hex invertor, and 74LS86 was the quad XOR.
You're correct in that multi-path governs cellular communications, particularly for spread spectrum systems like IS-95 CDMA. However, wouldn't the fact that the device is flying above the skyline with no objects for the signal to bounce off of minimize multi-path effects? It's almost free air space with no obstructions when you're pointed at an airplane.
The only real way to be sure is to take field measurements, but I am pretty sure that this would be a Rician model (line of sight with multipath) with a fairly big Doppler shift. My reasoning is that since the mainlobe of the antenna is horizontal or pointing downward, it will pick up building and ground reflections. Since they are doing picocell and retransmitting, then can precompensate for the Doppler, though, by measurements on pilot channel. This topic has come up several times on comp.dsp. The general consensus was that the LOS component really helps things more than you think.
Antenna manufacturers try to make these nodes small because it's just wasted energy. One would rather have that energy pointed to where the traffic is. So the cell phones that are in the air will have moderate to poor signal strength which will require the cell phone and the base station radio to transmit at their highest power settings. For the base station, that's not too bad, but for the cell phone, you're suddenly going to have this giant source of interference because the phone will be broadcasting at its full power setting from nearly two miles above the surface. Since voice quality is indirectly proportional to the level of the noise floor in an area, cell phones service will get even worse.
I'm not sure if this is really true. Currently, cell phones operate totally without any line of sight component in a multipath envirinment (ie, a Rayleigh signal model). An airplane would have line of sight to a base station, but would still have multipath (ie, a Rician signal model). Having a LOS component greatly improves things. I haven't see a a Smith chart for a cell tower antenna in a while, but while the main lobe is basically horizontal, there will be a side lobe pointing up. Also, multipath dominates the quality issues in mobile communications. AWGN plays a part, but fading is a bigger problem.
Betamax is the consumer version, and is pretty much dead. The professional version, Betacam SP, is still used, and in some places, it is still the most popular video format. The main reason is that it works well, the Sony Beta decks will not die, the newer professional digital decks are really expensive.
It really has nothing to do with this. As others have pointed out, it is a warning for people who are still deploying systems with this chip, and for people doing maintenance on systems with this chip. In a lot of embedded and industial applications with long lifetimes, maintenance is a huge issue. There are companies who specialize in selling chips that are no longer produces (they buy up old stock and resell it).
No, that wasn't the Space Based Laser. That was just some ranging fire to make sure the targeting is accurate. The Space Based Laser fire will commence shortly.
In the PC world, you are correct. SRAM isn't used for main memory. In a lot of embedded applications, though, using SRAM for main memory is pretty common.
Memory manufacturers use megabits because they have done so for a long, long time. At one time, memory parts with single bit data busses were common. Even now, some devices have data widths other that eight, and not every CPU addresses eight bit bytes.
I think all consumer GPS devices do this, but there are lots of commercial/industiral GPS devices, too.
I don't think it would be that hard to integrate one of the chipsets from Trimble into a WAP to provide the feature Woz is describing. Install the WAP in the ceiling, and run some RG-58 to the roof for the antenna, and I think that would make spoofing the GPS a lot harder.
It has been a long time since I have worked in satcomm, but I think that all countries allow 2 degree spacing for C-band now. I know the US has allowed it since the 80's. I'm not positive, but I think that some allow 0.5 degree spacing for Ku band in certain circumstances.
Personally, I have never had problems reading either format, but I have clients who have had problems giving DVD+R masters to duplication houses, where DVD-R masters are fine.
However, as a Systems Admin, it would be nice to have this available to scan my corporate LAN. I am all for file-sharing, but I don't trust users to do so safely and would prefer to protect my servers and avoid lawsuits at work.
Won't the normal snort p2p.rules pick up most of this traffic?
Re:What's wrong with freezing a drive?
on
Creative Data Loss
·
· Score: 1
In a nutshell, the timing parameters for a chip are rated over a given temperature range. These parametrs are how a designer can guarantee that a design will work (think of them as tolerances). When the heat on the die gets too high, the timing can go out of spec and a design may stop working properly. The way to test to see if this is the case is to spray the chip (or chips) with some coolant, and see if the circuit starts working until it overheats again.
Re:What's wrong with freezing a drive?
on
Creative Data Loss
·
· Score: 2, Informative
In my experience, cold temperatures can cause solder joints to break. Also, I have never seen cold actually fix a problem other than proving that there is a heat-related timing problem in a deisgn.
If anyone is interested, a great book on the subject is Peitgen and Richter's The Beauty of Fractals. It presents a good mathematical background, but it also has tons of pictures demonstrating the math.
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I think GrangeBand is a software application for creating music that lulls cows into a false sense of security so that you can run up to them and push them over. Search for it on SourceForge or FreshMeat.
Read Bruce Schneier's Applied Cryptography, and then do all of the sample problems in the book.
Why have you only quoted low switching IC's to me. I don't want IC's I just want transistors and diodes.
My pre-submit post said that I don't remember transistor and diode circuit design that well. I know those datasheets have schematics, and I remember going through them in college to identifying what transsitor/diode did what.
If you find an old version of TI's TTL Databook, you will see the schematics for the various devices. You should be able to find scanned PDF versions on TI's website.
IIRC, 74LS00 was the quad NAND, 74LS08 was the quad AND, 74LS02 was the quad NOR, 72LS32 was the quad OR, 74LS04 was the hex invertor, and 74LS86 was the quad XOR.
Yeah, it would be great if a piece of production machinery craps out because someone wanted a bag of microwave popcorn...
Yeah, I want a browser that does one thing, and one thing well: browse the web. Extra features should be done with extensions and plugins.
You're correct in that multi-path governs cellular communications, particularly for spread spectrum systems like IS-95 CDMA. However, wouldn't the fact that the device is flying above the skyline with no objects for the signal to bounce off of minimize multi-path effects? It's almost free air space with no obstructions when you're pointed at an airplane.
The only real way to be sure is to take field measurements, but I am pretty sure that this would be a Rician model (line of sight with multipath) with a fairly big Doppler shift. My reasoning is that since the mainlobe of the antenna is horizontal or pointing downward, it will pick up building and ground reflections. Since they are doing picocell and retransmitting, then can precompensate for the Doppler, though, by measurements on pilot channel. This topic has come up several times on comp.dsp. The general consensus was that the LOS component really helps things more than you think.
Antenna manufacturers try to make these nodes small because it's just wasted energy. One would rather have that energy pointed to where the traffic is. So the cell phones that are in the air will have moderate to poor signal strength which will require the cell phone and the base station radio to transmit at their highest power settings. For the base station, that's not too bad, but for the cell phone, you're suddenly going to have this giant source of interference because the phone will be broadcasting at its full power setting from nearly two miles above the surface. Since voice quality is indirectly proportional to the level of the noise floor in an area, cell phones service will get even worse.
I'm not sure if this is really true. Currently, cell phones operate totally without any line of sight component in a multipath envirinment (ie, a Rayleigh signal model). An airplane would have line of sight to a base station, but would still have multipath (ie, a Rician signal model). Having a LOS component greatly improves things. I haven't see a a Smith chart for a cell tower antenna in a while, but while the main lobe is basically horizontal, there will be a side lobe pointing up. Also, multipath dominates the quality issues in mobile communications. AWGN plays a part, but fading is a bigger problem.
Many of the top college football programs generate enough net revenue to cover the cost of the entire varsity sports program.
Betamax is the consumer version, and is pretty much dead. The professional version, Betacam SP, is still used, and in some places, it is still the most popular video format. The main reason is that it works well, the Sony Beta decks will not die, the newer professional digital decks are really expensive.
It really has nothing to do with this. As others have pointed out, it is a warning for people who are still deploying systems with this chip, and for people doing maintenance on systems with this chip. In a lot of embedded and industial applications with long lifetimes, maintenance is a huge issue. There are companies who specialize in selling chips that are no longer produces (they buy up old stock and resell it).
New applications mostly use newer chips like the ARM, but legacy applications (and new orders of legacy products) still use older processors.
No, that wasn't the Space Based Laser. That was just some ranging fire to make sure the targeting is accurate. The Space Based Laser fire will commence shortly.
In the PC world, you are correct. SRAM isn't used for main memory. In a lot of embedded applications, though, using SRAM for main memory is pretty common.
Memory manufacturers use megabits because they have done so for a long, long time. At one time, memory parts with single bit data busses were common. Even now, some devices have data widths other that eight, and not every CPU addresses eight bit bytes.
I think all consumer GPS devices do this, but there are lots of commercial/industiral GPS devices, too.
I don't think it would be that hard to integrate one of the chipsets from Trimble into a WAP to provide the feature Woz is describing. Install the WAP in the ceiling, and run some RG-58 to the roof for the antenna, and I think that would make spoofing the GPS a lot harder.
Surround sound isn't limited to home theater. Both the SACD and DVA-A support it.
It has been a long time since I have worked in satcomm, but I think that all countries allow 2 degree spacing for C-band now. I know the US has allowed it since the 80's. I'm not positive, but I think that some allow 0.5 degree spacing for Ku band in certain circumstances.
Personally, I have never had problems reading either format, but I have clients who have had problems giving DVD+R masters to duplication houses, where DVD-R masters are fine.
However, as a Systems Admin, it would be nice to have this available to scan my corporate LAN. I am all for file-sharing, but I don't trust users to do so safely and would prefer to protect my servers and avoid lawsuits at work.
Won't the normal snort p2p.rules pick up most of this traffic?
In a nutshell, the timing parameters for a chip are rated over a given temperature range. These parametrs are how a designer can guarantee that a design will work (think of them as tolerances). When the heat on the die gets too high, the timing can go out of spec and a design may stop working properly. The way to test to see if this is the case is to spray the chip (or chips) with some coolant, and see if the circuit starts working until it overheats again.
In my experience, cold temperatures can cause solder joints to break. Also, I have never seen cold actually fix a problem other than proving that there is a heat-related timing problem in a deisgn.
If anyone is interested, a great book on the subject is Peitgen and Richter's The Beauty of Fractals. It presents a good mathematical background, but it also has tons of pictures demonstrating the math.
I'm not sure if many people remember, but there was a short time when the kernel source was compiled with g++, even though the source was plain C.
IIRC (memeory very hazy, though), it lasted about a month in 1992 or 1993, and it had something to do with type-safe linking(?).
I believe the politically correct term is RUS.