"on the otherhand I suppose that if one were to install special bridges (with packet switiches) across every transformer..."
Or just use low current, high frequency transformers with one winding connected across the power transformer's primary and the other winding connected across the power transformer's secondary. Since this "jumper transformer" would be bi-directional with regard to the data flow I'm not sure you could really classify either one of it's windings as the primary or the secondary.
As a passive device it would probably be a lot cheaper than a special (or even ordinary) packet switching active device.
The power companies probably worry a lot more about their transformers being low impedence at 60 Hz than they do about making sure that they serve as very good low-pass/high-cut filters, that is, they want them to be excellent band-pass at 60 Hz devices without giving as much thought to the upper and lower cut-off frequencies, so it might be interesting to see just how high a frequency you could transmit with minimum attenuation from one winding to the other.
Residential 240 is single phase with a center tapped ground/neutral and 2 "hot" wires which are 180 degrees "out of phase" with each other and each with the center tap, which, when it is positive from the point of view of one of the hot wires is negative from the point of view of the other.
In a 3-phase system each of the three "hot" wires is behind or ahead of the other 2 by 120 degrees. In a Wye connected system, with the common connection of all three windings used as ground/neutral, the voltage between any one hot wire and ground/neutral is 120 Volts (averaged, same as the voltage between either hot wire and ground/neutral of a single phase center tapped system), and the voltage between any 2 of the 3 hot wires is 208 Volts.
From "Practical Electrical Wiring" by Richter & Schwan (McGraw-Hill): "A 2-phase system, which is similar in principle but inferior to a 3-phase system, is used in so few localities that it does not warrant space in this book."
An individual residence's 120/240 service may well be one of three delta connected secondary windings of a transformer with the ground/neutral connected to the center tap of that one winding, with the building's 120 Volt circuits fed by that one secondary winding's ground/neutral and one end of that secondary winding or by the center tap and the other end of that same secondary winding, and the 240 Volt circuits fed by the two ends of that one secondary winding. Call the three nodes where the ends of the 3 delta connected secondary windings connect A, B, and C. One end of the first secondary winding connects to one end of the second secondary winding at node A. The other end of the second winding connects to one end of the third winding at B. The other end of the third winding connects to the other end of the first winding at C. A residence might be fed by wires connected to A and C and a ground/neutral connected to a center tap of the winding between A and C. No wire leading from node B will run to that residence. Some other building might use A and B but not C, or B and C but not A. A to B is one phase. B to C is a second phase. C to A is the third phase. Each building's feed is one of those 3 phases, therefore it is single phase. Unless, of course, 3/3=2.
TVs and monitors auto-degauss at turn-on and are finished before the tube filiment has warmed up enough for you to see anything on the screen.
The traditional way of doing it was to attach one lead of the built-in de-gaussing coil to one side of the incoming AC line and the other lead to the other side of the incoming line(after it went through the power switch) through a special type of resistor (a positive temperature co-efficient resistor, or posistor) that has a very low resistance at turn-on (so that full current flows through the de-gaussing coil) and rapidly rises in resistance (causing a rapid tapering off of current through it) as it heats up from the current flow through it until the resistance is so high that almost no current flows.
This accomplishes the same thing as using an external manual coil that you back slowly away from the screen as great a distance as possible (thus reducing the magnetic field strength through distance instead of tapering off the current the way the posistor does on the internal coil) before switching off or unplugging the external manual coil.
On newer "digital" monitors with user-accessible degauss buttons, the posistor has probably been replaced with some kind of remotely controlled semiconductor, and on yours some other problem was triggering that semiconductor every so often. Maybe that part of the circuitry was falsely being told "the monitor has just been turned on" and responding accordingly.
"If I have multiple telephones, can a proxy combine two or more 56K connections to get a larger pipe?"
Well, actually you'd need multiple telephone lines:-)
Diamond (or whatever they were most recently named before finally going out of business) used to advertise something they called "shotgun" modems; you bought two of them for one computer and used one on one phone line and the other on a second phone line. Apparently in addition to whatever software came with the modems (probably Windows only) you had to get your dial-up ISP to go to some effort to support it as well.
Calling it a DC component is a bit misleading. A flow of direct current isn't really part of it. You might as well say that since the stuff coming out of your wall socket crosses the zero axis 120 times per second (twice per cycle) that it has a DC component. Baseband starts at 0 Hz and goes up however high it goes depending upon the bandwidth of that particular technology, but, then, so can broadband. Both can can be transformer coupled, which removes any DC component.
Plain Old Telephone Service is almost baseband (300 Hz to 3000 Hz) and it can pass through a high enough capacitance capacitor just fine. Audio goes from 20 Hz up to 20,000 Hz and it goes through capacitors all the time. RCA plug video is considered baseband and it goes through capacitors as well.
Some broadband technologies have the lowest of the multiple bands in the same place (0 Hz up to 0 + width of band) as baseband.
DSL is broadband because more than one "channel" exists on the same wire at the same time, the under voice part you mentioned, where still used, and the frequency of the ringing voltage , the 2700 Hz voice band (3000 Hz - 300 Hz), and the heterodyned up above 3000 Hz data stream that can be used for internet access or a background music service or whatever else the phone company can get the government and the laws of physics to let them put there.
Note: The 48 Volts DC on your phone line isn't really part of any of those channels, it's basically the phone company equivalent of phantom power.
If not for the shadow mask that extra brightness would be caused by the electron beams hitting phosphor dots adjacent to the ones they're supposed to be hitting in addition to hitting the ones they're supposed to. It would be brighter but the blurriness would drive you nuts.
"I'm personally going with RCA from now on for home electronics..."
You realise, I hope, that RCA doesn't own RCA anymore. Consumer electronics that say RCA or GE are really from the French company Thomson, although there's no telling from one model to the next who they actually get to do the manufacturing, but you can be pretty sure that they're Japanese, Chinese, or Korean.
Do you at least have spring to look forward to? I remember spring and fall from 30 or 40 years ago here in coastal NC but now we have 3 seasons, summer (also known as hurricane season or too wet to mow the jungle formerly known as the back yard), winter, and everything covered in yellow dust (pine pollen).
Speaking of compost, look for a book called "Worms Eat My Garbage" to see how you can use a bunch of food waste that you would otherwise put in the garbage and speed up the process of turning it into compost. See if your local library has any back issues of Organic Gardening magazine from which to steal ideas.
You're unhappy with a policy instituted at the very top of this company and you propose to jump ugly with the minimum wage script following monkeys working the help desk? I don't think that'll deliver your message where it needs to be delivered.
Remember the server room name survey a few weeks back? I think "Bringer of Tears" would be a good candidate. Still surprised nobody submitted "Temple of Doom".
Yes this is off-topic but this is the most likely article to attract someone who can help me.
I need a test tone cd tomorrow morning before the stores open. I have a cd burner. Anybody know where I could find and download a file which could be made into a test tone cd?
"...that has a working 8-Track hooked to their board."
Are you sure that's really an 8-track (endless loop tape cartridge) machine and not an NAB endless loop tape cartridge machine which uses a very similar looking cartridge but was never a consumer market machine?
Yeah, but you didn't say anything (totally unrelated to validity of her article and, of course, immature) about whether or not she's really hot looking!
I don't see anything in the actual article or the page it's on to indicate whether the author is male or female and I don't know if the story submitter (overshoot) knows for sure or just assumed.
That probably is a pen name and not the author's real name, but it's not unheard of for columnists to do this.
The author might not be able to whip up a brand new operating system in assembly overnight, but it's obvious from reading the entire article that he or she knows a lot more about computers than the average user and is no stranger to installing software.
We need to get Taco to set up one of those best 10 question interviews with him/her.
I've been out of radio for a while now (and with all the stations in the area tending more and more towards "robot radio" I'll probably never go back) and don't keep up with the industry as much as I used to (that whole legal payola thing kinda took me by surprise), but isn't it Clear Channel that also has a business that handles most of the concert bookings these days as well, and also has a lot of leverage over the ticket selling business?
That way they decide who gets played, who gets to come to town to play, and what you have to pay to get in.
What part of GPS technology involves audio recording capability? What part of hiding an audio recorder of some sort under the dash requires installing a GPS system?
I don't know if Avis is evesdropping or not but that's probably unrelated to digitally recording GPS co-ordinates with time stamps.
Slashdot Mirror
(You're thinking of Rochester, but he was only the driver)
The equations were probably necessary in order to figure out how to do business with Jack Benny and still turn a profit.
Or just use low current, high frequency transformers with one winding connected across the power transformer's primary and the other winding connected across the power transformer's secondary. Since this "jumper transformer" would be bi-directional with regard to the data flow I'm not sure you could really classify either one of it's windings as the primary or the secondary.
As a passive device it would probably be a lot cheaper than a special (or even ordinary) packet switching active device.
The power companies probably worry a lot more about their transformers being low impedence at 60 Hz than they do about making sure that they serve as very good low-pass/high-cut filters, that is, they want them to be excellent band-pass at 60 Hz devices without giving as much thought to the upper and lower cut-off frequencies, so it might be interesting to see just how high a frequency you could transmit with minimum attenuation from one winding to the other.
In a 3-phase system each of the three "hot" wires is behind or ahead of the other 2 by 120 degrees. In a Wye connected system, with the common connection of all three windings used as ground/neutral, the voltage between any one hot wire and ground/neutral is 120 Volts (averaged, same as the voltage between either hot wire and ground/neutral of a single phase center tapped system), and the voltage between any 2 of the 3 hot wires is 208 Volts.
From "Practical Electrical Wiring" by Richter & Schwan (McGraw-Hill): "A 2-phase system, which is similar in principle but inferior to a 3-phase system, is used in so few localities that it does not warrant space in this book."
An individual residence's 120/240 service may well be one of three delta connected secondary windings of a transformer with the ground/neutral connected to the center tap of that one winding, with the building's 120 Volt circuits fed by that one secondary winding's ground/neutral and one end of that secondary winding or by the center tap and the other end of that same secondary winding, and the 240 Volt circuits fed by the two ends of that one secondary winding. Call the three nodes where the ends of the 3 delta connected secondary windings connect A, B, and C. One end of the first secondary winding connects to one end of the second secondary winding at node A. The other end of the second winding connects to one end of the third winding at B. The other end of the third winding connects to the other end of the first winding at C. A residence might be fed by wires connected to A and C and a ground/neutral connected to a center tap of the winding between A and C. No wire leading from node B will run to that residence. Some other building might use A and B but not C, or B and C but not A. A to B is one phase. B to C is a second phase. C to A is the third phase. Each building's feed is one of those 3 phases, therefore it is single phase. Unless, of course, 3/3=2.
The traditional way of doing it was to attach one lead of the built-in de-gaussing coil to one side of the incoming AC line and the other lead to the other side of the incoming line(after it went through the power switch) through a special type of resistor (a positive temperature co-efficient resistor, or posistor) that has a very low resistance at turn-on (so that full current flows through the de-gaussing coil) and rapidly rises in resistance (causing a rapid tapering off of current through it) as it heats up from the current flow through it until the resistance is so high that almost no current flows.
This accomplishes the same thing as using an external manual coil that you back slowly away from the screen as great a distance as possible (thus reducing the magnetic field strength through distance instead of tapering off the current the way the posistor does on the internal coil) before switching off or unplugging the external manual coil.
On newer "digital" monitors with user-accessible degauss buttons, the posistor has probably been replaced with some kind of remotely controlled semiconductor, and on yours some other problem was triggering that semiconductor every so often. Maybe that part of the circuitry was falsely being told "the monitor has just been turned on" and responding accordingly.
Why do you think they call it broadband?
Well, actually you'd need multiple telephone lines :-)
Diamond (or whatever they were most recently named before finally going out of business) used to advertise something they called "shotgun" modems; you bought two of them for one computer and used one on one phone line and the other on a second phone line. Apparently in addition to whatever software came with the modems (probably Windows only) you had to get your dial-up ISP to go to some effort to support it as well.
Plain Old Telephone Service is almost baseband (300 Hz to 3000 Hz) and it can pass through a high enough capacitance capacitor just fine. Audio goes from 20 Hz up to 20,000 Hz and it goes through capacitors all the time. RCA plug video is considered baseband and it goes through capacitors as well.
Some broadband technologies have the lowest of the multiple bands in the same place (0 Hz up to 0 + width of band) as baseband.
DSL is broadband because more than one "channel" exists on the same wire at the same time, the under voice part you mentioned, where still used, and the frequency of the ringing voltage , the 2700 Hz voice band (3000 Hz - 300 Hz), and the heterodyned up above 3000 Hz data stream that can be used for internet access or a background music service or whatever else the phone company can get the government and the laws of physics to let them put there.
Note: The 48 Volts DC on your phone line isn't really part of any of those channels, it's basically the phone company equivalent of phantom power.
If not for the shadow mask that extra brightness would be caused by the electron beams hitting phosphor dots adjacent to the ones they're supposed to be hitting in addition to hitting the ones they're supposed to. It would be brighter but the blurriness would drive you nuts.
I assume you mean other than the degauss at power-on that anything with a CRT is supposed to do automatically?
You realise, I hope, that RCA doesn't own RCA anymore. Consumer electronics that say RCA or GE are really from the French company Thomson, although there's no telling from one model to the next who they actually get to do the manufacturing, but you can be pretty sure that they're Japanese, Chinese, or Korean.
Uh, miracle workers?
If you're in central Mass. and I'm in humid coastal Carolina I suspect we have differing definitions of "sweltering".
Do you at least have spring to look forward to? I remember spring and fall from 30 or 40 years ago here in coastal NC but now we have 3 seasons, summer (also known as hurricane season or too wet to mow the jungle formerly known as the back yard), winter, and everything covered in yellow dust (pine pollen).
It'll still be a major pain, though.
Speaking of compost, look for a book called "Worms Eat My Garbage" to see how you can use a bunch of food waste that you would otherwise put in the garbage and speed up the process of turning it into compost. See if your local library has any back issues of Organic Gardening magazine from which to steal ideas.
You're unhappy with a policy instituted at the very top of this company and you propose to jump ugly with the minimum wage script following monkeys working the help desk? I don't think that'll deliver your message where it needs to be delivered.
Remember the server room name survey a few weeks back? I think "Bringer of Tears" would be a good candidate. Still surprised nobody submitted "Temple of Doom".
I need a test tone cd tomorrow morning before the stores open. I have a cd burner. Anybody know where I could find and download a file which could be made into a test tone cd?
Are you sure that's really an 8-track (endless loop tape cartridge) machine and not an NAB endless loop tape cartridge machine which uses a very similar looking cartridge but was never a consumer market machine?
Well actually you could use electromagnetism to apply drag or boost, depending upon which was needed.
Somebody give that man a +1, Funny (even if it turns out to be a woman).
Perspiring slashdotters want to know!
That probably is a pen name and not the author's real name, but it's not unheard of for columnists to do this.
The author might not be able to whip up a brand new operating system in assembly overnight, but it's obvious from reading the entire article that he or she knows a lot more about computers than the average user and is no stranger to installing software.
We need to get Taco to set up one of those best 10 question interviews with him/her.
That way they decide who gets played, who gets to come to town to play, and what you have to pay to get in.
I don't know if Avis is evesdropping or not but that's probably unrelated to digitally recording GPS co-ordinates with time stamps.