Her hearing aid must be picking up access point's transmission and demodulates it. WiFi transmits data using small packets of data. So i guess she can hear pops, clicks, buzzing, or noise if access point is very busy.
Any GMS mobile phone can make audible noise if placed near cheap audio amplifier and can make picture pops on old CRT monitors. Hers hearing aid must be picking up transmission of an access point in the same way.
I doubt people can be allergic to WiFi. Why only WiFi, microwave ovens are stronger 1000 times more? TV transmitters are 1000 times stronger than microwave ovens...
I can sense strong electromagnetic fields. For example I can sense if TV transmitter or FM radio transmitter is on or off, and that is no big deal. Many people I know can do that. But those transmitters are transmitting hundreds of watts, WiFi goes up to 400 milliwatts. It would be very interesting if someone would be able to detect low power transmitters without hearing aids or similar electronic devices.
I'm sorry about bad link. There seems to be an bug related to href HTML field in slashdot's new posting system. Link did show up correctly on preview.
Just look at the CFR version 3.3 and 4.0. they have very good power output and over-unity efficiency too.
According to this site, someone did something and has some data: CFR data
Also there are some interesting videos on YouTube.
It looks too simple to reproduce. The only thing that is hard to get are the electrodes ( Pd, W, Cr ) heavy water and a various radiation detectors.
You can do a lot on 500 meters using homemade antennas (scroll down, check pdf's) . Or you can buy any with gain of 15 dB or more.
1. Be sure to use routers that have external connections to avoid messy soldering. Anything with more than 17dbm is good enough.
2. Put the damn routers in the the sealed boxes outside, in the shade, close to the antennas. Keep coaxial cables short, less than 5 meters is good enough. Use Power over ethernet to power the routers.
3. Use uni-directional high gain low Q-factor antennas. Use coaxial cables suited for the GHz range frequencies. Use appropriate connectors and mounting to avoid boring repairs.
4. If You are interested in an wireless community, the simplest way to start is to put Your e-mail, or some other contact data in radio name or something that people can see when scanning.
I am using the wireless internet right now, with speed of more than 500 kilobytes per second at approximately 800 meters form the base access point.
It would be very nice if *all* software manufacturers would start to:
1) make software that does not need to be reinstalled after the operating system is wiped/installed or reinstalled
2) make software that can verify the consistency of its own files and report to the user or operating system if files had been changed and ask for the user to verify the change
3) force users to actually think about location and safety of the data / backup / etc.
That would help, but making an operating system that does not attract malware like magnet attracts nails would help even more.
That's it. I had enough. I'm buying the playstation 3. Period. NO Windows installation, NO driver update, NO DirectX reinstalling, NO malware / spyware / trojans / viruses.
I have slightly different approach to the increasing the efficiency of the CPU.
I switch off ACPI mode in BIOS before I install the Windows. This forces windows to run in PIC mode.
While this method effectively disables the power management of the low power devices in my PC, it removes need for the CPU to process ACPI power saving scripts. This removes 10-15% of CPU load effectively giving you what the overclocking would without any power consumption increase or chance for BSOD / bricking / file system failure.
Also I am running declocked CPU with RAM timing set to relaxed settings. This decreases few celsius on the CPU.
I have reduced total number of the cooling fans to only two. One is in power supply, and the other cools down the CPU and the rest of the motherboard / add on cards. This reduces the noise and saves the power. In order to keep my motherboard / graphic card cool and long lasting I had to make air tunnels out of insulation foam, aluminium sheets and sticky tape to channel cool and hot air. It sounds funny and looks crazy, but CPU is running far below critical temperature and CPU is much cooler than it would without such intervention.
I agree. Grid-tied is way too much complicated for the hobbyist.
Maybe an heavily modified UPS with external battery bank and solar/wind recharger is an better solution. Getting rid of major home energy hogs, and changing the habits might help too.
Well... going green eider hurts or just costs much in invested work or money.
I wonder if it is possible to make some manner of three layer LED that could conduct in both directions and whether it would exhibit a noticeable flickering. There are LEDs that conduct electricity the both ways, sadly they are uncommon and hard to obtain. The trick is to connect two LEDs in such way to conduct the current the both ways and put them in the same case. It is fairly simple for the ordinary LEDs.
That also takes care of the flickering as it doubles the flickering frequency. An full wave bridge rectifier could make the same effect, but would make huge voltage drop ( 1.2 to 2 volts depending on the load ) reducing the efficiency.
Having the two LEDs in the same casing connected in this way is great because allows the alternating current to flow the both ways and the current can be doubled for the single LED, form 20 mA to 40 mA as diodes have the duty cycle of 50% on AC voltage.
Induction motors can be used as generators
and they automatically shut down when grid is down. Induction motor will continue to make electricity as long as it's rotor keeps on turning because of the remnant magnetic field in rotor. Even if the rotor stops turning, some magnetic filed might still be present in rotor, depending on magnetic alloy type, and will produce some voltage if the rotor starts turning again.
Also if not properly protected, it might overload if grid power is turned off. For grid tied generators an controller is needed to prevent connecting the AC induction motor when for example, wind speed is to low because in that case the generator will work as an fan, effectively eating the power form the grid. Controller must provide soft or at least partially synchronised connection to the grid.
CO2 has the lowest CO2 emissions compared to coal and natural gas (the only other practical base load generation facility types in the US. Also, nuclear material can be recycled without the need to dispose of it through the use of Breeder reactors:
Correction:
Nuclear has the lowest CO2 emissions compared to coal and natural gas.. Non-carbon compared to carbon.. not much of an competition right? How about hydro or wind power?
You are clearly referring to recycling, reusing the "spent" nuclear fuel.
The nuclear fuel is the last thing that needs to be taken care of when disposing off the nuclear reactor. It is the smallest in volume and the easiest to store or transport. It can be reused in breeder reactors because it is still fuel.
The biggest problem are reactor parts that have been exposed to radiation for years and have become radioactive. They have shorter half-life's, radiate at dangerous levels, are bulky, chemically reactive, and can not be recycled or reused. They are the main pollutant and the biggest problem.
The fabric itself can be made in such way to be highly resistant to tearing apart when punctured. It should be much easier to fix textile fabric than solid cable or an rope. I am aware of the pressure and the gravity relation. The pressure is not constant, but the gravity is not constant too. The gravity makes the pressure, I see no problem in that. That is the true advantage of the system.
The payload can be stored in a big and light capsule, sphere, bullet head like container or something similar. That could minimize the pressure needed to push the payload up. Anyway I wasn't thinking of supersonic propelling of payload, that would be insane. Unlike the rocket fuel, pressure is easy and cheap to make and store, and is easy to control too!
Any material capable of hanging down several thousands of kilometers should be able to hold some pressure, right?
The pressure will keep the tube rigid, providing some stability. Also lightweight textile tube will dampen vibrations and dangerous oscillations better than any cable would because of the material properties and construction itself.
The advantages over the tether / cable climber are numerous.
How about an elastic tube made of thin and strong material.
Payload could travel up, inside the tube, powered by pressure from the ground station, saving a lot of energy ( yes, the fuel stays on the ground, it does not travel up, stupid rockets ). Some pressure could escape around the payload to keep it centered.
In case of the defect, tube would rip itself to pieces, and fall down. Since ti has big surface to mass ratio pieces would fall down slower than cable would. The upper section of tube could be pulled up by the inertial forces or the rockets at the end of the tube. Most of the tube wouldn't hit the ground.
I can't agree more. This works more than fine. It is not the first time long range have been achieved using WiFi equipment.
I'm not saying that Intel's routers are bad. This one looks like it can survive the ice age. If they could get it under $200...
Have no idea, but, I would fill and empty mast to adjust rocking frequency of the boat to achieve better conversion of wave energy ( rocking ) to forward motion. I guess that is why mast is so thick yet it has no sails on it.
Back in the days of IE 4/5 and NS 4-4.7, Netscape was NOT fast by any measure. It was slow to start, slow to load pages, True it was slow, but that was because Netscape actually checked every single link that user clicked on against Netscape security rating, and that takes time. Netscape sand boxed scripts and applets, and that made it notoriously slow, but superbly secured compared to competition. Unlike IE Netscape never loaded infected pages (viruses or exploits bundled within JPG images was cool way to terrorize users at second half of '90s) and warned users about known risky pages.
and crashed (at least for me) far more often than IE. The only thing that really annoyed me is that feedback agent, that really caused Netscape to crash frequently. Installed without feedback agent Netscape was stable, except for the pages with exploits deliberately made to crash Netscape, or the ones with poorly written malware / exploits.
I never wanted to "pay for protection", so IE was never an option for me. I really hate installing antiviral and anti-malware tools, and updating them over the Internet, so I completely rely on Netscape's customizable Site Control on this 8.1.3 version that I use right now. I tried FireFox 2, but I scored 10 trojans in 4 days of use, and reverted back to Netscape as I had 4 trojans / worms in 3 years of surfing with it.
Hint: Netscape9 == FireFox2. I liked the old flavour better.
You Sir are wrong. Find and download Netscape 8.1.3 and see for Yourself how wrong You are.
Netscape offered customizable Site Controls. That feature can be used to protect against the malware, if configured correctly.
I call BS.
1. No. Solder is not very strong when repeatedly heated and cooled. It becomes brittle and breaks. Next time when you see a grandpa kicking the TV to get picture back it is the bad soldering joint. The only difference is that an TV gets cracked soldering joints after 10+ years, Xbrick X360 needs only 1+.
Now, the X360 is Rohs compliant which means it uses AgTn solder instead of TnPb, and that leads to more failures in all modern electronics, I digress. Let mi fix that for You: It is not AgTn it is AgSn. It is not TnPb it is SnPb in most cases SnPb with small amount of Ag or Cu.
2. Actually usual SnPb alloy melts around 180deg C. RoHS alloy is almost pure tin ( Sn ) and melts around 230deg C. Soldering must be done at slightly higher temperature, say 260deg C or more, and guess what AgSn is bitch to solder, it melts the circuit board glue, eats soldering iron tips and can overheat components. Who cares if AgSn is more stronger than SnPb if it stresses circuit board more during soldering process.
3. BGA packed chips are famous for solder joint breaks. RoHS joints do crack on rear occasions, they usually peel off the circuit board pads, the ones that are more weakened during 260 deg C reflow soldering. When that happens the whole circuit board is essentially unrepairable. Also BGA components "hate" to be resoldered manually (see 2.) as they are heat sensitive, and they have soldering pads similar to that one on circuit board. That makes repairing extremely difficult and unreliable.
Everybody likes to be ahead of the game, and nobody wants to plod along the old-fashioned way. A sense that you're better than everyone else is expected, and even essential (and not just in video games). I completely disagree with you. If I need to search online for the answer, then I am essentially "playing the book" playing already played, which is in essence of it an blasphemy against the gaming itself: not playing the game but reading about the game, not discovering the world by playing in it, but by reading about it on thottbot, alakazam, etc.. If I wanted to read, I would have bought the damn book, not the game.
[rant]
I consider a cheater an person who uses add-ons and UI mods to: modify their/roll to get better items, to make their trinkets instant cool down, to "see" mobs drop before the mob is killed, etc...
[/rant]
Online games (and any game in which you accumulate possessions).. [rant]
In WoW for example, every 3 to 5 months complete skill system is rearranged, or broken by an expansion pack in such way that most of the "easy to get" gear is rendered useless so that most of the players are sent back to grinding zones, instances, new quests, or yet more convenient to gold farmers who provide "cheap" gold for the valuable items sold on auctions.
[/rant]
In all of that cheaters get more lucky by means of exploiting the game. Example:
[xml] [mmorpg]
Cheaters level faster, cheaters get better drops (and grind less), sell more and make more gold. More gold allows them to buy better gear, that allows them to advance faster in guilds. Higher rank in guilds allows them to get better gear from the guild chest, and that allows them to get better drops and make more gold...
[/mmorpg] [/xml]
It is recursive... there is no end. Once a cheater always cheater. It is so sweet to cheat, to be ahead of the game, to be ahead of the game-play.
All that makes game bitter to play for the players that do not use cheats. I see no fun in games that have cheats / gold-farmers / stock gear. Random drops and custom tailored gear is the good old-fashioned way. The forgotten way.
Oh, I'm sorry, we are not talking about gaming revolution, we are talking about gaming (MMORPG) industry.
My bad. Sorry.
Magnetic is more efficient, but only if transmitter coil and receiving coils are extremely close one to another. It is in an essence flat "air core" transformer.
RF is more flexible, works on distance but it is terribly inefficient: it is difficult to efficiently produce powerful electromagnetic waves, RF is difficult to turn into controlled DC voltage needed to power electronics in efficient manner, and it is impossible to focus all RF energy into the beam.
Apart from that batteries / electronics need regulated current / voltage to charge / work so both methods need a way to rectify AC into DC and control it levels.
It is in essence a trade off: efficiency for "cordlessability".
Hmm... how narrow can microwave energy beam be?
Let's say that power output is one gigawatt and say 10 times more denser than solar radiation at the surface, then it is about 10KW per m^2 at surface. Not deadly, but very abundant and slightly hot. Could damage unprotected electronic devices like computers, radios etc. "Hot Spot" radius could be ~560m and microwave radiation might scatter while traveling trough atmosphere, allowing enemy troops to pinpoint beam direction easily.
It's like saying: "Hello, We're over here! Send Your SCUD missiles on us."
Not very smart way to supply power to the ground troops.
Also I can't imagine accurate and reliable beam targeting system for an low Earth orbit satellite.
Slashdot Mirror
Her hearing aid must be picking up access point's transmission and demodulates it. WiFi transmits data using small packets of data. So i guess she can hear pops, clicks, buzzing, or noise if access point is very busy.
Any GMS mobile phone can make audible noise if placed near cheap audio amplifier and can make picture pops on old CRT monitors. Hers hearing aid must be picking up transmission of an access point in the same way.
I doubt people can be allergic to WiFi. Why only WiFi, microwave ovens are stronger 1000 times more? TV transmitters are 1000 times stronger than microwave ovens...
I can sense strong electromagnetic fields. For example I can sense if TV transmitter or FM radio transmitter is on or off, and that is no big deal. Many people I know can do that. But those transmitters are transmitting hundreds of watts, WiFi goes up to 400 milliwatts. It would be very interesting if someone would be able to detect low power transmitters without hearing aids or similar electronic devices.
Exactly. Unlike other experimets this one is well documeted, and available on public site.
I'm sorry about bad link. There seems to be an bug related to href HTML field in slashdot's new posting system. Link did show up correctly on preview.
Just look at the CFR version 3.3 and 4.0. they have very good power output and over-unity efficiency too.
http://jlnlabs.online.fr/cfr/html/cfrdatas.htm
According to this site, someone did something and has some data:
CFR data
Also there are some interesting videos on YouTube.
It looks too simple to reproduce. The only thing that is hard to get are the electrodes ( Pd, W, Cr ) heavy water and a various radiation detectors.
304km link made by Italian radio amateurs.
You can do a lot on 500 meters using homemade antennas (scroll down, check pdf's) . Or you can buy any with gain of 15 dB or more.
1. Be sure to use routers that have external connections to avoid messy soldering. Anything with more than 17dbm is good enough.
2. Put the damn routers in the the sealed boxes outside, in the shade, close to the antennas. Keep coaxial cables short, less than 5 meters is good enough. Use Power over ethernet to power the routers.
3. Use uni-directional high gain low Q-factor antennas. Use coaxial cables suited for the GHz range frequencies. Use appropriate connectors and mounting to avoid boring repairs.
4. If You are interested in an wireless community, the simplest way to start is to put Your e-mail, or some other contact data in radio name or something that people can see when scanning.
I am using the wireless internet right now, with speed of more than 500 kilobytes per second at approximately 800 meters form the base access point.
It would be very nice if *all* software manufacturers would start to:
1) make software that does not need to be reinstalled after the operating system is wiped/installed or reinstalled
2) make software that can verify the consistency of its own files and report to the user or operating system if files had been changed and ask for the user to verify the change
3) force users to actually think about location and safety of the data / backup / etc.
That would help, but making an operating system that does not attract malware like magnet attracts nails would help even more.
That's it. I had enough.
I'm buying the playstation 3. Period. NO Windows installation, NO driver update, NO DirectX reinstalling, NO malware / spyware / trojans / viruses.
Just pure and simple PLUG&PLAY.
I have slightly different approach to the increasing the efficiency of the CPU.
I switch off ACPI mode in BIOS before I install the Windows. This forces windows to run in PIC mode.
While this method effectively disables the power management of the low power devices in my PC, it removes need for the CPU to process ACPI power saving scripts. This removes 10-15% of CPU load effectively giving you what the overclocking would without any power consumption increase or chance for BSOD / bricking / file system failure.
Also I am running declocked CPU with RAM timing set to relaxed settings. This decreases few celsius on the CPU.
I have reduced total number of the cooling fans to only two. One is in power supply, and the other cools down the CPU and the rest of the motherboard / add on cards. This reduces the noise and saves the power. In order to keep my motherboard / graphic card cool and long lasting I had to make air tunnels out of insulation foam, aluminium sheets and sticky tape to channel cool and hot air. It sounds funny and looks crazy, but CPU is running far below critical temperature and CPU is much cooler than it would without such intervention.
I agree. Grid-tied is way too much complicated for the hobbyist.
Maybe an heavily modified UPS with external battery bank and solar/wind recharger is an better solution. Getting rid of major home energy hogs, and changing the habits might help too.
Well... going green eider hurts or just costs much in invested work or money.
That also takes care of the flickering as it doubles the flickering frequency. An full wave bridge rectifier could make the same effect, but would make huge voltage drop ( 1.2 to 2 volts depending on the load ) reducing the efficiency.
Having the two LEDs in the same casing connected in this way is great because allows the alternating current to flow the both ways and the current can be doubled for the single LED, form 20 mA to 40 mA as diodes have the duty cycle of 50% on AC voltage.
type error at quotes. it should be:
Induction motors can be used as generators and they automatically shut down when grid is down.
Induction motors can be used as generators and they automatically shut down when grid is down. Induction motor will continue to make electricity as long as it's rotor keeps on turning because of the remnant magnetic field in rotor. Even if the rotor stops turning, some magnetic filed might still be present in rotor, depending on magnetic alloy type, and will produce some voltage if the rotor starts turning again.
Also if not properly protected, it might overload if grid power is turned off. For grid tied generators an controller is needed to prevent connecting the AC induction motor when for example, wind speed is to low because in that case the generator will work as an fan, effectively eating the power form the grid. Controller must provide soft or at least partially synchronised connection to the grid.
Correction: Nuclear has the lowest CO2 emissions compared to coal and natural gashttp://en.wikipedia.org/wiki/Breeder_reactor
You are clearly referring to recycling, reusing the "spent" nuclear fuel.The nuclear fuel is the last thing that needs to be taken care of when disposing off the nuclear reactor. It is the smallest in volume and the easiest to store or transport. It can be reused in breeder reactors because it is still fuel.
The biggest problem are reactor parts that have been exposed to radiation for years and have become radioactive. They have shorter half-life's, radiate at dangerous levels, are bulky, chemically reactive, and can not be recycled or reused. They are the main pollutant and the biggest problem.
The fabric itself can be made in such way to be highly resistant to tearing apart when punctured. It should be much easier to fix textile fabric than solid cable or an rope.
I am aware of the pressure and the gravity relation. The pressure is not constant, but the gravity is not constant too. The gravity makes the pressure, I see no problem in that. That is the true advantage of the system.
The payload can be stored in a big and light capsule, sphere, bullet head like container or something similar. That could minimize the pressure needed to push the payload up. Anyway I wasn't thinking of supersonic propelling of payload, that would be insane. Unlike the rocket fuel, pressure is easy and cheap to make and store, and is easy to control too!
Any material capable of hanging down several thousands of kilometers should be able to hold some pressure, right?
The pressure will keep the tube rigid, providing some stability. Also lightweight textile tube will dampen vibrations and dangerous oscillations better than any cable would because of the material properties and construction itself.
The advantages over the tether / cable climber are numerous.
How about an elastic tube made of thin and strong material.
Payload could travel up, inside the tube, powered by pressure from the ground station, saving a lot of energy ( yes, the fuel stays on the ground, it does not travel up, stupid rockets ). Some pressure could escape around the payload to keep it centered.
In case of the defect, tube would rip itself to pieces, and fall down. Since ti has big surface to mass ratio pieces would fall down slower than cable would. The upper section of tube could be pulled up by the inertial forces or the rockets at the end of the tube. Most of the tube wouldn't hit the ground.
It's just an idea, one of many...
I can't agree more.
This works more than fine. It is not the first time long range have been achieved using WiFi equipment.
I'm not saying that Intel's routers are bad. This one looks like it can survive the ice age. If they could get it under $200...
Have no idea, but, I would fill and empty mast to adjust rocking frequency of the boat to achieve better conversion of wave energy ( rocking ) to forward motion. I guess that is why mast is so thick yet it has no sails on it.
I never wanted to "pay for protection", so IE was never an option for me. I really hate installing antiviral and anti-malware tools, and updating them over the Internet, so I completely rely on Netscape's customizable Site Control on this 8.1.3 version that I use right now. I tried FireFox 2, but I scored 10 trojans in 4 days of use, and reverted back to Netscape as I had 4 trojans / worms in 3 years of surfing with it.
Hint: Netscape9 == FireFox2. I liked the old flavour better.
You Sir are wrong. Find and download Netscape 8.1.3 and see for Yourself how wrong You are.
Netscape offered customizable Site Controls. That feature can be used to protect against the malware, if configured correctly.
1. No. Solder is not very strong when repeatedly heated and cooled. It becomes brittle and breaks. Next time when you see a grandpa kicking the TV to get picture back it is the bad soldering joint. The only difference is that an TV gets cracked soldering joints after 10+ years, Xbrick X360 needs only 1+.
Now, the X360 is Rohs compliant which means it uses AgTn solder instead of TnPb, and that leads to more failures in all modern electronics, I digress. Let mi fix that for You: It is not AgTn it is AgSn. It is not TnPb it is SnPb in most cases SnPb with small amount of Ag or Cu.
2. Actually usual SnPb alloy melts around 180deg C. RoHS alloy is almost pure tin ( Sn ) and melts around 230deg C. Soldering must be done at slightly higher temperature, say 260deg C or more, and guess what AgSn is bitch to solder, it melts the circuit board glue, eats soldering iron tips and can overheat components. Who cares if AgSn is more stronger than SnPb if it stresses circuit board more during soldering process.
3. BGA packed chips are famous for solder joint breaks. RoHS joints do crack on rear occasions, they usually peel off the circuit board pads, the ones that are more weakened during 260 deg C reflow soldering. When that happens the whole circuit board is essentially unrepairable. Also BGA components "hate" to be resoldered manually (see 2.) as they are heat sensitive, and they have soldering pads similar to that one on circuit board. That makes repairing extremely difficult and unreliable.
[rant]
I consider a cheater an person who uses add-ons and UI mods to: modify their
[/rant]
Online games (and any game in which you accumulate possessions).. [rant]
In WoW for example, every 3 to 5 months complete skill system is rearranged, or broken by an expansion pack in such way that most of the "easy to get" gear is rendered useless so that most of the players are sent back to grinding zones, instances, new quests, or yet more convenient to gold farmers who provide "cheap" gold for the valuable items sold on auctions.
[/rant]
In all of that cheaters get more lucky by means of exploiting the game. Example:
[xml] [mmorpg]
Cheaters level faster, cheaters get better drops (and grind less), sell more and make more gold. More gold allows them to buy better gear, that allows them to advance faster in guilds. Higher rank in guilds allows them to get better gear from the guild chest, and that allows them to get better drops and make more gold...
[/mmorpg] [/xml]
It is recursive... there is no end. Once a cheater always cheater. It is so sweet to cheat, to be ahead of the game, to be ahead of the game-play.
All that makes game bitter to play for the players that do not use cheats. I see no fun in games that have cheats / gold-farmers / stock gear. Random drops and custom tailored gear is the good old-fashioned way. The forgotten way.
Oh, I'm sorry, we are not talking about gaming revolution, we are talking about gaming (MMORPG) industry.
My bad. Sorry.
Both of the methods are far from perfect.
Magnetic is more efficient, but only if transmitter coil and receiving coils are extremely close one to another. It is in an essence flat "air core" transformer.
RF is more flexible, works on distance but it is terribly inefficient: it is difficult to efficiently produce powerful electromagnetic waves, RF is difficult to turn into controlled DC voltage needed to power electronics in efficient manner, and it is impossible to focus all RF energy into the beam.
Apart from that batteries / electronics need regulated current / voltage to charge / work so both methods need a way to rectify AC into DC and control it levels.
It is in essence a trade off: efficiency for "cordlessability".
Onanbots or Onannites?
Onanotechnology?
Hmm... how narrow can microwave energy beam be?
Let's say that power output is one gigawatt and say 10 times more denser than solar radiation at the surface, then it is about 10KW per m^2 at surface. Not deadly, but very abundant and slightly hot. Could damage unprotected electronic devices like computers, radios etc. "Hot Spot" radius could be ~560m and microwave radiation might scatter while traveling trough atmosphere, allowing enemy troops to pinpoint beam direction easily.
It's like saying: "Hello, We're over here! Send Your SCUD missiles on us."
Not very smart way to supply power to the ground troops.
Also I can't imagine accurate and reliable beam targeting system for an low Earth orbit satellite.