How does Wireless work so well?
Discussion
Alert Einstein said:
"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."
you're an old chav! 
The simple answer is you don't really want to know as this would cause your brain to fillup and have to dump a chunk of longterm memory. If I explained it all, you would probably forget your 10th birthday party or some other vital past events
If you really want to twist your melon think about this.
You are in Australia and pickup your mobile phone and tap in a number and press the call button 20 seconds later you are talking to your friend in the UK - WOW!
The simple answer is you don't really want to know as this would cause your brain to fillup and have to dump a chunk of longterm memory. If I explained it all, you would probably forget your 10th birthday party or some other vital past events
If you really want to twist your melon think about this.
You are in Australia and pickup your mobile phone and tap in a number and press the call button 20 seconds later you are talking to your friend in the UK - WOW!
Radio signals travel at the same speed as light which is roughly 186,000 miles PER SECOND,
Ever tried putting Radio 2 on you Sky box, and the radio at the same time, there is a slight delay in the reception, coz the signal is travelling up to the satelite, and back to your aerial, which adds a few milisends to the time.
Another interesting one about sound speed, a person in Australia will hear big ben dong on his radio before a person standing on the pavement below it, this is due to the vast difference in the speed of a radio wave, and the speed of sound. Urts the brain dont it.
Ever tried putting Radio 2 on you Sky box, and the radio at the same time, there is a slight delay in the reception, coz the signal is travelling up to the satelite, and back to your aerial, which adds a few milisends to the time.
Another interesting one about sound speed, a person in Australia will hear big ben dong on his radio before a person standing on the pavement below it, this is due to the vast difference in the speed of a radio wave, and the speed of sound. Urts the brain dont it.
Vipers said:
Another interesting one about sound speed, a person in Australia will hear big ben dong on his radio before a person standing on the pavement below it, this is due to the vast difference in the speed of a radio wave, and the speed of sound. Urts the brain dont it.
That's assuming the time it takes for the sound to travel to the microphone which is recording big ben, the time it takes for the radio sound to travel to the Aussies ear and the processing time at either end is less than the time it takes for the sound to travel down to the guy on the pavement
wanty1974 said:Don't even think about consumer wireless devices when it comes to computing - we're barely scratching the surface. It's all radio waves, and it's the same thing that transmits mobile phone signals, terrestial TV, walkie talkie broadcasts etc.
Call me an old chav and all that, but here I sit, 10 metres from my wireless ADSL point, receiving all of TwinCam's opinions about general UK politics and I wonder how on earth such data can be transfered over the air so quickly.
Any people who can explain this wonderment to me?
If you think wireless data transmission is cool, wait till wireless *electricity* becomes common place. It's already been done...
It's all down to the high frequencies WiFi uses (2.4Ghz and 5Ghz), which is up in the microwave region.
Basically, the higher the frequency, the more data you can pack into it. Along the same principle as FM radio (88 to 108 Mhz) being good quality stereo radio and short wave (about 500Khz to 1500kHz) being crap quality!!
Basic explaination here
More in-depth here
>> Edited by _dan_ on Sunday 12th June 00:43
Basically, the higher the frequency, the more data you can pack into it. Along the same principle as FM radio (88 to 108 Mhz) being good quality stereo radio and short wave (about 500Khz to 1500kHz) being crap quality!!
Basic explaination here
More in-depth here
>> Edited by _dan_ on Sunday 12th June 00:43
I think he's talking about electrical induction. That's how RFID tags work, and now some wireless mice and phone chargers. It's very low power and short distance - don't expect your washing machine to be wirelessly powered anytime soon.
>> Edited by rebelstar on Sunday 12th June 10:18
>> Edited by rebelstar on Sunday 12th June 10:18
Tesla experimented with "wireless" power distribution in houses. He used enormously powerful electromagnetic fields ... I'll see if I can find any pictures ...
Well, hree's a link to some text in which he describes his global power transmission scheme http://mysite.verizon.net/vzeoyr81/magtrans.html
>> Edited by ATG on Sunday 12th June 10:42
Well, hree's a link to some text in which he describes his global power transmission scheme http://mysite.verizon.net/vzeoyr81/magtrans.html
>> Edited by ATG on Sunday 12th June 10:42
chrisjl said:
Tesla experimented with "wireless" power distribution in houses. He used enormously powerful electromagnetic fields ... I'll see if I can find any pictures ...
Wouldn't that make your fillings hum and your cutlery stick to the walls?
Quite possibly. Think along the lines of living inside a microwave oven.
ATG said:
ATG said:
Tesla experimented with "wireless" power distribution in houses. He used enormously powerful electromagnetic fields ... I'll see if I can find any pictures ...
Wouldn't that make your fillings hum and your cutlery stick to the walls?
Quite possibly. Think along the lines of dying inside a microwave oven.
mindgam3 said:As far as I know, the microphone is in the bell tower itself, so thats why the guy in oz hears it first,
Another interesting one about sound speed, a person in Australia will hear big ben dong on his radio before a person standing on the pavement below it, this is due to the vast difference in the speed of a radio wave, and the speed of sound. Urts the brain dont it.
That's assuming the time it takes for the sound to travel to the microphone which is recording big ben, the time it takes for the radio sound to travel to the Aussies ear and the processing time at either end is less than the time it takes for the sound to travel down to the guy on the pavement
rebelstar said:
I think he's talking about electrical induction. That's how RFID tags work, and now some wireless mice and phone chargers. It's very low power and short distance - don't expect your washing machine to be wirelessly powered anytime soon.
Ah, yes, quite cool but hardly new.....
And you're never going to power anything big with it....
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