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Comment Re:What would Americans comment to this? (Score 1) 1019

I know that for instance mortgage is a different thing in the US, in Holland the debt stays with you and if selling the house doesn't cover the debt you get to keep paying, whereas Americans can apparently just abandon the house and walk away, the debt is with the house.

This is not true. When people say they walk away from a mortgage, it essentially means they are declaring bankruptcy and their credit is destroyed. If you sell a house below the price you paid for it, you will take a loss and still have to pay off the loan.

-molo

Comment Long-distance VHF/UHF happens often (Score 1) 71

Look at the records for 144MHz and 430MHz long distance ham radio contacts (two-way contacts; ignore the EME section, those are being bounced off the moon). Note that distances are in kilometers. Tropospheric ducting is occasionally strong enough to even propagate 430MHz FM signals long distances, like the 2672km contact between northwestern Spain and a ship off the coast of Mauritania.

Most countries limit their ham radio licensees to less than 2kW. In the US it is 1.5kW. In the UK it depends on the license level, I think. This is more than enough power to reach long distances, even on VHF and UHF. The reason your FM broadcast radio doesn't reach long distances is basically that broadcast radio receivers are generally very poor in terms of sensitivity. And the antennas used are similarly poor. Another factor is that the US radio market (maybe the UK also?) is fairly saturated in metropolitan areas. When you drive close to the edge range of a transmitter, often another station begins interfering. There is a zone where you can receive neither very well without directional antennas.

Some more reading on VHF propagation is on Wikipedia.

-molo

Comment "OMG WTF PDF" lecture (Score 1) 202

If you're wondering what they're talking about you should watch this video. http://www.youtube.com/watch?v=54XYqsf4JEY

For a demo, see the 38:00 mark. The windows "calc.exe" is modified to simultaneously a valid windows exe, a valid zip archive, and a valid PDF. The same file can appear benign to anti-virus tools even though there is malware contained in the file when interpreted in certain ways.

-molo

Comment Re:The only thing taller.. (Score 1) 407

Okay, I found this on wikipedia about land use:

A 200 MW power plant with the same 1000-metre-high tower would need a collector 7 kilometres in diameter (total area of about 38 km^2).

http://en.wikipedia.org/wiki/Solar_updraft_tower#Conversion_rate_of_solar_energy_to_electrical_energy

Since this is "only" 800m, it will need a larger collector area (how much larger is unclear).

-molo

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