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Comment: Re:all I'd need there is a sports iPod (Score 1) 427

by anethema (#47323967) Attached to: Ask Slashdot: What Would It Take For You To Buy a Smartwatch?

Ya my current watch (Casio pathfinder ) is already pretty smart as far as watches go (has altimiter, barometer, compass) and half the face is a solar panel. I've not had to change a battery since I got it, and expect I wont for a long long long time.

Be nice if a smart watch could be rugged without being the size of a phone, and have solar or some kind of decent battery life. A month even would be nice.

Comment: Unlocked iPhone 5s does it all (Score 1) 259

by anethema (#47157361) Attached to: Ask Slashdot: Do 4G World Phones Exist?

O2 and Vodaphone appear to use LTE band 20 (SOURCE: AT&T and Canadian carriers generally seem to use bands 4 and 17 (same source).

The iPhone 5s does all of those and more. Model A1533 (GSM)*: UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz); LTE (Bands 1, 2, 3, 4, 5, 8, 13, 17, 19, 20, 25)

  (Source: )

I may be missing something but just buying an unlocked iPhone 5S from apple seems to give you all the LTE, HSPA, etc networks you could use in the UK and USA/Canada.

Comment: Apple Maps (Score 1) 198

by anethema (#46379361) Attached to: Apple To Unveil Its 'iOS In the Car' Project Next Week

"Drivers will be able to use Apple Maps as in-car navigation"

Not sure how that compares to most in-car navigation, but Apple maps is still a pile of garbage. They maps are much harder to see than googles, the POI database is terrible, the routing is unusable, at least in small-town Canada.

Be interesting to see what they come up with but I sure hope it has an App store to switch out the maps.

Comment: Re:Gravity wells and other distance issues (Score 1) 330

by anethema (#46321173) Attached to: Japanese Firm Proposes Microwave-Linked Solar Plant On the Moon

Actually you are understating the difficulty of transmitting that power.

There are several big problems. One is real world rectennas are not that efficient. The best best lab condition ones with lower power are 90% but high power ones are quite a bit less, sometimes up to 75 percent or so.

The other massive loss is transmission loss. The basic formula is 32.45 + 20log(d) + 20log(f). Using the 1.32 TW estimate in this post: and a rough 24ghz given in this page http://www.propagation.gatech.... we would have around 231 db. Considering you are starting with 121 dBW of power, you are left with -110dBW of power on earth not accounting for antenna gains.

Since a watt is 0dBW, we need 55db of dish gain on either side to get 1 watt and a gain of 115 to get the input power generation. At 24 GHz this is a 3 KILOMETER dish on either end. The largest parabolic on earth now is 0.3 km, so ten times that. Plus it would have to always point at the moon (how? No idea).

Plus You would lose your 50% or more since obviously the whole equator isn't facing the sun. Then the 50-70 from your rectenna loses.

I imagine a bunch of other stuff from other losses I havent taken into account (Convert to AC, line loss, whatever else) and I cant imagine this being feasable.

Comment: Re:There are several good indie titles (Score 1) 669

by anethema (#46285629) Attached to: Ask Slashdot: What Games Are You Playing?

I actually found its not really like Cod at all.

There are similarities, like there would with any shooter. But there is parkour like running around (Like Assassins creed, but first person), jetpacks (due two these two, you have to think very vertically, or get killed very often), cloaks, "burn cards" which grant cool abilities, plus the obvious very large titans running around.

Comment: Re:Beware the CSI effect. (Score 1) 93

by anethema (#45926957) Attached to: First Recorded Observation of Freshwater Fish Preying On Birds In Flight

Yeah I really enjoyed the behind the scenes stuff of the BBC Planet earth showing the sharks catching the seals.

They aren't sure where/when/if it is going to happen, so catching the shots was tough.

They had a cool high speed camera that was always recording, and when they hit the button to get their slow-mo footage, the video camera recorded 2 seconds BEFORE and 2 after they pressed it, otherwise they would never have been able to get the whole event.

Pretty interesting.

Comment: Re:geostationary GPS satellites (Score 1) 247

by anethema (#45878619) Attached to: Is Earth Weighed Down By Dark Matter?

They are absolutely not geostationary. The whole reason your GPS needs time to 'lock' when you haven't used it in a while is it is downloading the orbital path(Ephemeris) data from the satellites themselves. Once it knows where they should be at which times exactly, it knows where it is relatively.

So basically, none of them are geostationary, unless you count ground based DGPS stations, that obviously don't move haha.

Comment: Re:Awesome (Score 1) 295

by anethema (#45878553) Attached to: CES: Laser Headlights Edge Closer To Real-World Highways

You don't actually have to replace the housing to get this though. The proper retrofits put a projector lens inside your current housing.

These for example are designed to be modified into stock housings:

Also if you've seen a HID Xenon bulb, the ball inside that makes the light is bigger in almost every dimension as compared to a filament in a Halogen bulb. This is why the light tends to be a bit unfocused in a halogen housing without a projector, just the stock reflector. But even still most of the problem comes from the fact that they are just twice as bright. You see much of the same glare with a halogen installed it is just too dim to be annoying.

Comment: Re:Seeing the gravity is only 1/6th up there (Score 1) 90

by anethema (#45758457) Attached to: Smooth, 6.5 Hour Spacewalk To Fix ISS Ammonia Pump

Yeah it is surprising how many people think there is no gravity in orbit.

Gravity is only reduced by roughly 10 percent at that distance from earth. The reason it seems like there is no gravity is you are always falling towards the earth. You just happen to keep missing !

Do a retrograde burn and you will stop missing quickly though.

"Religion is something left over from the infancy of our intelligence, it will fade away as we adopt reason and science as our guidelines." -- Bertrand Russell