They probably meant 1 TW ERP (effective radiated power). Since they are both closer and can use directional antennas with gain, their jamming would look like a 1TW point souce at the jammed transmitter.
Re:Very interesting... it's been done
on
HighWLAN
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· Score: 1
I haven't researched the issue, but I believe that a ham can legally modify an 802.11 box. I am quite sure that it is legal if the operating frequency is moved to one of the ham bands (I don't recall if it is already in a "shared" band).
Normally this would be the case but last time I checked hams were only allowd to use certain spreading sequences and I do not think that the 802.11b ones are the same. We also are not generally allowed to use any sort of encryption.
Third, why don't computers and related equipment have small builtin UPSs? They already have DC power supplies, and DC is what is needed to charge most batteries. DC is what the computer actually needs, and DC is what batteries produce. Doing some battery backup inside each box would be pretty easy. How much battery does a little ethernet hub need? External UPSs need to make AC from DC (which is never terribly efficient) and they themselves become single points for potential failure. Sure, if you need a survivable facility, buy big UPSs and generators, but the failover and resistance to tripping over power cords would be so much better if each piece of equipment had a few minutes of backup built in. A well maintained generator should be able to start up and be running smoothly within just a few minutes. If the equipment itself could last a dozen minutes or so, there would be no need for any external UPSs other than for a few CRTs. As most power problems are very short, even home users would like a few minutes of backup time.
The internal DC voltage on a typical switching power supply is 340 Volts DC which corresponds to rectifying 240 Volts AC. If you are running on 120 Volts AC, they double it first which is what that little switch on the back sets.
It would be relatively easy to add the battery back up system at this point using a boost converter and a couple of years ago I heard about someone doing just that. As a bonus, this would make an online UPS with no transfer time. It would be easy enough to add this kind of functionality to any power supply with the appropriate external connector. Too bad they (the power supply manufacturers) don't.
You might want to be carefull with this one. The energy to start this reaction can be provided by a flashlight beam. You can mix the hydrogen and florine in a ballon IN THE DARK and then set it off by shining a flashlight on it. BANG!
When Fry's Electronics and Micro City first showed up in Southern California, they were selling printer cables and mice for 50 cents each. Some time later I was over at a friend's house and he started having trouble with his mouse. He then unplugged it, threw it in the trash, and reached over into a box to get a new one in the original packaging. He had bought 20 dollars worth of mice and figured it wasn't worth cleaning them anymore.
Speaking of Star Trek, Star Wars, and Babylon 5, what is the deal with having all of the ships line up with a common orientation in space? B5 does better with this later in the series but still. I remember an old Star Trek (the Enterprise is after a Romulan ship that hides behind a comet) where the order was givin to minimize the forward profile of the ship so as not to be too big a target but I guess most audiences would miss this.
As far as using technobable (midiclorians) to make something more scifi-ish, it bugs me when they introduce something neccessary for the plot but do not explore the why and how. "Gee, why couldn't we just make more midiclorians and have Super-Jedi?" "We don't want any Jedi interfearing in our plans, let's put up midiclorian detectors (like metal detectors) at all entrances and exits to keep them out." Star Trek is very bad in this respect. "Let's drop off the captain in a shuttlecraft so he can travel to such-and-such starbase and get a heart transplant. It will only take him a day and we have to get the Enterprise to Rigel in a hurry. We can cover that distance in 2 seconds at Warp 7? Oh, nevermind."
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They probably meant 1 TW ERP (effective radiated power). Since they are both closer and can use directional antennas with gain, their jamming would look like a 1TW point souce at the jammed transmitter.
Emitter area of bipolar transistor:
Ranchet
which is equal to 1 picoacre (10^-12)
Normally this would be the case but last time I checked hams were only allowd to use certain spreading sequences and I do not think that the 802.11b ones are the same. We also are not generally allowed to use any sort of encryption.
KD6LZA
Third, why don't computers and related equipment have small builtin UPSs? They already have DC power supplies, and DC is what is needed to charge most batteries. DC is what the computer actually needs, and DC is what batteries produce. Doing some battery backup inside each box would be pretty easy. How much battery does a little ethernet hub need? External UPSs need to make AC from DC (which is never terribly efficient) and they themselves become single points for potential failure. Sure, if you need a survivable facility, buy big UPSs and generators, but the failover and resistance to tripping over power cords would be so much better if each piece of equipment had a few minutes of backup built in. A well maintained generator should be able to start up and be running smoothly within just a few minutes. If the equipment itself could last a dozen minutes or so, there would be no need for any external UPSs other than for a few CRTs. As most power problems are very short, even home users would like a few minutes of backup time.
The internal DC voltage on a typical switching power supply is 340 Volts DC which corresponds to rectifying 240 Volts AC. If you are running on 120 Volts AC, they double it first which is what that little switch on the back sets.
It would be relatively easy to add the battery back up system at this point using a boost converter and a couple of years ago I heard about someone doing just that. As a bonus, this would make an online UPS with no transfer time. It would be easy enough to add this kind of functionality to any power supply with the appropriate external connector. Too bad they (the power supply manufacturers) don't.
amsdell and globtek come up with a search on Google.
H2 + F2 -> 2HF
You might want to be carefull with this one. The energy to start this reaction can be provided by a flashlight beam. You can mix the hydrogen and florine in a ballon IN THE DARK and then set it off by shining a flashlight on it. BANG!
When Fry's Electronics and Micro City first showed up in Southern California, they were selling printer cables and mice for 50 cents each. Some time later I was over at a friend's house and he started having trouble with his mouse. He then unplugged it, threw it in the trash, and reached over into a box to get a new one in the original packaging. He had bought 20 dollars worth of mice and figured it wasn't worth cleaning them anymore.
Speaking of Star Trek, Star Wars, and Babylon 5, what is the deal with having all of the ships line up with a common orientation in space? B5 does better with this later in the series but still. I remember an old Star Trek (the Enterprise is after a Romulan ship that hides behind a comet) where the order was givin to minimize the forward profile of the ship so as not to be too big a target but I guess most audiences would miss this. As far as using technobable (midiclorians) to make something more scifi-ish, it bugs me when they introduce something neccessary for the plot but do not explore the why and how. "Gee, why couldn't we just make more midiclorians and have Super-Jedi?" "We don't want any Jedi interfearing in our plans, let's put up midiclorian detectors (like metal detectors) at all entrances and exits to keep them out." Star Trek is very bad in this respect. "Let's drop off the captain in a shuttlecraft so he can travel to such-and-such starbase and get a heart transplant. It will only take him a day and we have to get the Enterprise to Rigel in a hurry. We can cover that distance in 2 seconds at Warp 7? Oh, nevermind."