inyouagain
Posts: 418
Joined: 1/6/2004
Status: offline
|
quote:
ORIGINAL: sub4hire
Wireless connection on a bus? How many terrorists have I come across in my daily life?
Also the US claims they never had him in custody. What would it really matter if they did or they did'nt?
I just hope the parents can find some peace someday.
Wireless connections are just like cell phones, and will work anywhere a cell phone works usually... buses, trains, planes, ships, cars... anywhere in many cases. Just as "text messaging" and "digital pictures" are sent to/from cell phones, wireless internet connections work very similarly.
Limiting factors would be location restrictions, such as the way domestic airlines usually don't allow personal electronics that convert freqiencies (heterodyning) to be used during flights. Many AM/FM radios use heterodyning as a part of demodulation, to convert the AM or FM band spectrum frequencies to a lower "common" frequency by mixing it with a local oscillator signal, and the resultant sum signal is lower frequency and the same demodulator can be used for all frequencies within the AM or FM frequency bands. This is an analog radio frequency (RF) process.
Digital encoding uses different modulation techniques with the RF carrier signal, and does not require frequency conversion or mixing. There are no undesired harmonics generated up and down the frequency band as analog processes generate.
The interference problem is not the actual RF carrier frequency, it's the odd and even harmonic frequencies generated above and below the RF carrier signal during mixing for demodulation that can cause interference with flight controls and navigation equipment on board airliners.
Buses don't have electronic flight controls, or navigation transponders and receivers which are affected by harmonic frequencies. The presence of a harmonic frequency induces errors in the calculations of position, altitude, and bearing.
The US Dept of Transportation (DOT) has not forbid personal electronics (analog or digital), but the Federal Aviation Agency (FAA) mandated restrictions for certain personal electronics use onboard commercial jets. Some will let you use them while on the ground, but discontinue their use while airborne, and some will allow laptop computer use with onboard wireless access. The FAA determined a few crashes were the result of induced errors, and issued their mandate.
Many Hospitals also forbid the use of all personal electronic equipment, even cell phones in certain Critical Care wards.
Ever wonder why public locations with Microwave ovens in use are required to have a warning for "pacemaker" patients? It's because the harmonics generated by the Microwave's high frequency Magnetron Tube amplifier can interfere with the pacemaker's operation.
Yes, wireless internet on a bus. As long as the bus is within cell phone tower distance, the wireless connection will work, if it is not forbidden to use it.
BTW, the Al Queda operative was allegedly none other than Masacarus Marcoui (the alleged 15th 911 hijacker), or whatever his name is... the one that has been held is US custody since before 911, the one who has been acting as his own lawyer. Yes, that means the e-mail was sent prior to 911, which means Nick Berg was in the Middle East prior to 09/11/2001, over 2½ years ago.
Inyouagain
_____________________________
Careful with that axe, Eugene 
|
meanwhile, back in iraq - 
Profile
New Messages
No New Messages
Hot Topic w/ New Messages
Hot Topic w/o New Messages
Locked w/ New Messages
Locked w/o New Messages
Post New Thread