TV imprisonment ended at least 15 years ago; cable-ready TV freed us for non-pay NTSC programming and cable-ready HDTV will free us for non-pay HDTV programming.
Until a few years ago, my cable company scrambled all of its channels, forcing everyone to use their POS set-top box to watch TV. It didn't matter if your television set was cable-ready. Your television set was going to be permanently tuned to channel 3, the RF output of the set-top box. Even today, you have to use the set-top box to watch any of the premium channels like HBO.
What law? By putting your trash at the curb, you relinquish ownership. Anyone can legally take it. Police officers do not have special rights in this area.
The author seems to be upset that innocent third-parties are being inconvenienced by black-hole lists. Tough shit. If it takes a thousand back-hoes cutting every Internet link to South Korea, China, Russia and other spam havens, to suppress spam, I will chip in for the diesel fuel. These ISPs don't care about spam and I don't care if they get BGP'd off the face of the Earth, along with any legitimate users they might serve.
It would produce a "fizzle" and kill anyone in the immediate area. You need about 52kg of U235 to make a gun assembly bomb. The primary problem in assembling a critical mass of any fissionable material is the assembly time in relationship to the frequency of spontaneously generated neutrons. The critical mass must be assembled quickly enough that the probability of a "fizzle" caused by background neutron radiation is reduced to an acceptable level. U235 has a low level of background neutron radiation, allowing assembly of a critical mass by the relatively slow method of a gun shooting a U235 plug into a U235 target. Pu239 has a much higher level of background neutron radiation, making gun assembly impractical. This resulted in the development of implosion systems, which have a much faster assembly time. The higher the background neutron radiation level, the faster you must assemble the critical mass.
The amount of effort Microsoft has put into enhancing and fixing bugs in their command line tools since the release of MS-DOS 1.0 and MS-DOS 2.0 is so close to zero that it generates an underflow error. Bill said many years ago that he doesn't assign programmers to projects unless the project will make money for Microsoft or advance its strategic goals. Making customers happy is not a sufficient reason.
Liberal gun control advocates have a long history of fabricating and distorting statistics to support their positions. I have seen similar behaviour from environmental advocacy groups. The next time anyone quotes a statistic to support their group's position, ask them for a citation to support their numbers.
I have seen "Liberal Science" at work in government research and development. Research projects that support the liberal orthodoxy get funded, research projects that are skeptical are not funded and the agency gets threatened with budget cuts if it generates research critical of someone's sacred cow.
The problem is that there are large companies that do content creation and distribution. They may own a movie studio, broadcast network, radio and television stations, cable channels and cable systems. This creates many reasons for not selling content to third parties. The DBS people ran into this problem when they wanted to distribute "cable channels" via satellite. The cable operators had ownership interests in, and strong influence over many cable channels.
It may be an obvious security flaw now, but it didn't used to be for many programmers. To mangle an old joke, "This program crashes when I type 514 characters into a text entry field!", "Well, don't do that!". It used to be common to assume that the user was not hostile and that the program was not getting its input from some random hacker on the Internet.
Status information is usually being continually downlinked in the telemetry. This includes things like the status of the command receiver and decoder. Memory dumps are usually only transmitted in the telemetry when the control center sends a command for a memory dump.
Control centers handle their own retransmission of lost/corrupted commands. They transmit a command and check the telemetry to see if it was received by the spacecraft. If it was lost, they retransmit the command. The details are very spacecraft dependent. Commands may execute immediately upon receipt or they may be split into two phases, load command and execute command. Some commands are time tagged for execution at a later time. A set of commands can be uplinked into a command buffer on the spacecraft, verified by a memory dump in the telemetry stream, and executed after the control center has verified that they got a good load of the command list.
NASA already uses multicast UDP for transferring telemetry and command data between ground stations and control centers/experimenters. Congestion control is handled by scheduling the bandwidth of the data lines. This is on a private NASA Internet that is not connected to the public Internet. The air/ground communications links use the CCSDS standards.
Combining the output of multiple antennas is not new. This can be done with standard microwave components. The problem is that it adds complexity and expense. If you want improved sensitivity, I believe that it is cheaper to build a larger antenna. Most of the antenna arrays that I've read about were built to get increased resolution (effective aperture), not sensitivity.
It is trivial to remove a piece of paper from an ordinary sealed envelope, modify it or replace it, and put it back in the envelope. Intelligence agencies have been doing it for centuries.
Most ground station receivers use a phase-lock loop to track the carrier in the downlink signal. The carrier frequency isn't a constant. There is thermal drift in the spacecraft's transmitter oscillator and there is doppler shift from relative motion. The spacecraft's signal is transmitted at microwave frequencies, making it impossible to record it with current technology. The signal is down-converted to a standard intermediate frequency and demodulated by the ground station receiver. The phase-lock loop is used to generate local oscillator frequencies in the receiver and fed to a frequency counter for doppler measurements.
For critical systems, nothing gets changed without an approved change request. All changes must be examined, tested and approved by someone other than the programmer. You can also have a separate group to maintain the source libraries and to do builds.
It's part of standard industrial safety procedures not to use two-way radios in areas with flammable or explosive atmospheres. The radio can directly or indirectly produce a spark. There are specially designed and certified radios that can be safely used in a flammable or explosive atmosphere. Your cell phone is not one of them.
Re:Interference?
on
DOD vs. 802.11b
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· Score: 3, Informative
A radar may have a very high ERP (effective radiated power), but the signal returned from an illuminated target is small. You have the path loss to and from the target. That is what makes it possible to jam a radar with a modest transmitter.
It wouldn't be a smart move for the spammer. The list includes a large number of people who would react very negatively to the spam, and have the ability to do something about it.
You don't need to replace the tower and the entire broadcast chain. You can get by with keeping all your NTSC gear and buying an ATSC encoder/exciter and a new transmitter. It will not be HDTV, but it will be DTV and enough to meet FCC requirements.
Kill ISS and the Shuttle and you have destroyed the manned spaceflight program at NASA. It would save a lot of money. It would also throw away a large amount of individual expertise and institutional knowledge, making it more difficult and expensive for NASA to ever put people in space again.
While it isn't a desirable situation, the article makes it sound much worse than it is. I have a.22 rifle. I could theoretically kill all the inhabitants of a small city. Quick, call a SWAT team!
For many years, the FCC has allowed part (470-512 MHz) of the UHF television band to be used for land mobile radio services in areas where those channels are not being used by television stations. My local police department uses frequencies in this band.
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Until a few years ago, my cable company scrambled all of its channels, forcing everyone to use their POS set-top box to watch TV. It didn't matter if your television set was cable-ready. Your television set was going to be permanently tuned to channel 3, the RF output of the set-top box. Even today, you have to use the set-top box to watch any of the premium channels like HBO.
What law? By putting your trash at the curb, you relinquish ownership. Anyone can legally take it. Police officers do not have special rights in this area.
The author seems to be upset that innocent third-parties are being inconvenienced by black-hole lists. Tough shit. If it takes a thousand back-hoes cutting every Internet link to South Korea, China, Russia and other spam havens, to suppress spam, I will chip in for the diesel fuel. These ISPs don't care about spam and I don't care if they get BGP'd off the face of the Earth, along with any legitimate users they might serve.
It would produce a "fizzle" and kill anyone in the immediate area. You need about 52kg of U235 to make a gun assembly bomb. The primary problem in assembling a critical mass of any fissionable material is the assembly time in relationship to the frequency of spontaneously generated neutrons. The critical mass must be assembled quickly enough that the probability of a "fizzle" caused by background neutron radiation is reduced to an acceptable level. U235 has a low level of background neutron radiation, allowing assembly of a critical mass by the relatively slow method of a gun shooting a U235 plug into a U235 target. Pu239 has a much higher level of background neutron radiation, making gun assembly impractical. This resulted in the development of implosion systems, which have a much faster assembly time. The higher the background neutron radiation level, the faster you must assemble the critical mass.
The amount of effort Microsoft has put into enhancing and fixing bugs in their command line tools since the release of MS-DOS 1.0 and MS-DOS 2.0 is so close to zero that it generates an underflow error. Bill said many years ago that he doesn't assign programmers to projects unless the project will make money for Microsoft or advance its strategic goals. Making customers happy is not a sufficient reason.
I have seen "Liberal Science" at work in government research and development. Research projects that support the liberal orthodoxy get funded, research projects that are skeptical are not funded and the agency gets threatened with budget cuts if it generates research critical of someone's sacred cow.
The problem is that there are large companies that do content creation and distribution. They may own a movie studio, broadcast network, radio and television stations, cable channels and cable systems. This creates many reasons for not selling content to third parties. The DBS people ran into this problem when they wanted to distribute "cable channels" via satellite. The cable operators had ownership interests in, and strong influence over many cable channels.
See the 14th amendment and the incorporation doctrine.
I can't write a purchase order for an auction on e-bay.
It may be an obvious security flaw now, but it didn't used to be for many programmers. To mangle an old joke, "This program crashes when I type 514 characters into a text entry field!", "Well, don't do that!". It used to be common to assume that the user was not hostile and that the program was not getting its input from some random hacker on the Internet.
Status information is usually being continually downlinked in the telemetry. This includes things like the status of the command receiver and decoder. Memory dumps are usually only transmitted in the telemetry when the control center sends a command for a memory dump.
Control centers handle their own retransmission of lost/corrupted commands. They transmit a command and check the telemetry to see if it was received by the spacecraft. If it was lost, they retransmit the command. The details are very spacecraft dependent. Commands may execute immediately upon receipt or they may be split into two phases, load command and execute command. Some commands are time tagged for execution at a later time. A set of commands can be uplinked into a command buffer on the spacecraft, verified by a memory dump in the telemetry stream, and executed after the control center has verified that they got a good load of the command list.
NASA already uses multicast UDP for transferring telemetry and command data between ground stations and control centers/experimenters. Congestion control is handled by scheduling the bandwidth of the data lines. This is on a private NASA Internet that is not connected to the public Internet. The air/ground communications links use the CCSDS standards.
Combining the output of multiple antennas is not new. This can be done with standard microwave components. The problem is that it adds complexity and expense. If you want improved sensitivity, I believe that it is cheaper to build a larger antenna. Most of the antenna arrays that I've read about were built to get increased resolution (effective aperture), not sensitivity.
It is trivial to remove a piece of paper from an ordinary sealed envelope, modify it or replace it, and put it back in the envelope. Intelligence agencies have been doing it for centuries.
Most ground station receivers use a phase-lock loop to track the carrier in the downlink signal. The carrier frequency isn't a constant. There is thermal drift in the spacecraft's transmitter oscillator and there is doppler shift from relative motion. The spacecraft's signal is transmitted at microwave frequencies, making it impossible to record it with current technology. The signal is down-converted to a standard intermediate frequency and demodulated by the ground station receiver. The phase-lock loop is used to generate local oscillator frequencies in the receiver and fed to a frequency counter for doppler measurements.
For critical systems, nothing gets changed without an approved change request. All changes must be examined, tested and approved by someone other than the programmer. You can also have a separate group to maintain the source libraries and to do builds.
It's part of standard industrial safety procedures not to use two-way radios in areas with flammable or explosive atmospheres. The radio can directly or indirectly produce a spark. There are specially designed and certified radios that can be safely used in a flammable or explosive atmosphere. Your cell phone is not one of them.
A radar may have a very high ERP (effective radiated power), but the signal returned from an illuminated target is small. You have the path loss to and from the target. That is what makes it possible to jam a radar with a modest transmitter.
The solution.
It wouldn't be a smart move for the spammer. The list includes a large number of people who would react very negatively to the spam, and have the ability to do something about it.
You don't need to replace the tower and the entire broadcast chain. You can get by with keeping all your NTSC gear and buying an ATSC encoder/exciter and a new transmitter. It will not be HDTV, but it will be DTV and enough to meet FCC requirements.
Kill ISS and the Shuttle and you have destroyed the manned spaceflight program at NASA. It would save a lot of money. It would also throw away a large amount of individual expertise and institutional knowledge, making it more difficult and expensive for NASA to ever put people in space again.
While it isn't a desirable situation, the article makes it sound much worse than it is. I have a .22 rifle. I could theoretically kill all the inhabitants of a small city. Quick, call a SWAT team!
For many years, the FCC has allowed part (470-512 MHz) of the UHF television band to be used for land mobile radio services in areas where those channels are not being used by television stations. My local police department uses frequencies in this band.