On Thu, 05 Apr 2012 19:27:08 +0100, Jeff wrote:



Who was the inventor of this "coils in radio transmitters"?

Marconi.

So this:

"A Magnifying Transmitter is an advanced version of Tesla's tesla coil, a
high power radio transmitter. Often cited as Tesla's greatest invention, the
Magnifying Transmitter consisted of three coils: an air-core transformer
plus a third coil operated as a grounded-base quarter-wave waveguide. In
Colorado Springs, Nikola Tesla constructed the first "Magnifying
Transmitter". From: http://www.wordiq.com/definition/Magnifying_Transmitter

is not true?
S*


That may or may not be a true account of a particular transmitter, but
has no bearing on the question that you asked, not being the first
transmitter to incorporate a coil.

Marconi tried to sell his communication system to the US army.
They refused to accept because the system would receive
from all ships simultaneously without selection.
Then he added selective tuneable circuits.

Tesla on the contrary polluted the whole radio band with his
broadband lightning towers and poked fun at those "Hertzian waves".
Tesla never understood and went bancrupt for senile stubborness.

w.

Actually, if you read Tom Edisons Bio - it says that he owed Tesla money and refused to pay.
Tesla was mad at Edison and said he was so stupid, he was willing to do something wrong 100 times until he found the right answer, then to spend the money and pay someone once to show him how to do it the right way.
Tom was the one who was hard headed.
Tesla's family was the ones who benefited by his death.
They were able to settle his estate and collect what was owed to them and were well off with the money that they received after his death.

Tesla was just stuck on trying to transmit electricity.
If you think about all the money spent on telephone poles, rights of ways, copper wire etc - if he could have perfected it - it would have made him a millionaire.

I would chock it up the same as the Tucker Automobile.
It was so far ahead of everyone else - as far as technology went that no one understood it and the Big 3 refused to allow him to make it, or they would have had to comply with the standards he invented and it would have cost them money, both in sales and in market share.

It was easier to get rid of Tucker then to allow him to produce his automobile and show the world how wrong the rest of the world was.

Things like air cooled engines, seat belts, padded dash boards, recessed knobs..

On 4/5/2012 8:10 PM, Channel Jumper wrote:


Tesla was just stuck on trying to transmit electricity.
If you think about all the money spent on telephone poles, rights of
ways, copper wire etc - if he could have perfected it - it would have
made him a millionaire.

Dunno.. Transmitting electricity through the air strikes me as
quite lossy, and if using a broad pattern to enable many people to use
it, the amount of recoverable energy vs what is transmitted would be
fairly small. A large amount would go off into space totally wasted.
If his method were actually practical, I suspect someone would be
using it by now on some scale.
There are enough loss just using a direct connection with wire.
I can light a florescent light bulb using the energy from my
HF mobile antenna. But only if I have the tube right next to
the antenna. Five feet away, fugettaboutit..

NM5K wrote:
On 4/5/2012 8:10 PM, Channel Jumper wrote:


Tesla was just stuck on trying to transmit electricity.
If you think about all the money spent on telephone poles, rights of
ways, copper wire etc - if he could have perfected it - it would have
made him a millionaire.

Dunno.. Transmitting electricity through the air strikes me as
quite lossy, and if using a broad pattern to enable many people to use
it, the amount of recoverable energy vs what is transmitted would be
fairly small. A large amount would go off into space totally wasted.
If his method were actually practical, I suspect someone would be
using it by now on some scale.

Exactly why the idea isn't used for anything much heavy duty than charging
a cell phone or a cordless toothbrush.

But system efficiency and losses were not something Tesla took into
concideration, nor was much thought put into how one whould charge
customers when they could have built the "receiver" end themselves
and obtained his electricity for free. Not a viable bussiness model.

Well darnitall! There goes my idea for a wireless extension cord!

Irv VE6BP

wrote in message
...
NM5K wrote:
On 4/5/2012 8:10 PM, Channel Jumper wrote:


Tesla was just stuck on trying to transmit electricity.
If you think about all the money spent on telephone poles, rights of
ways, copper wire etc - if he could have perfected it - it would have
made him a millionaire.

Dunno.. Transmitting electricity through the air strikes me as
quite lossy, and if using a broad pattern to enable many people to use
it, the amount of recoverable energy vs what is transmitted would be
fairly small. A large amount would go off into space totally wasted.
If his method were actually practical, I suspect someone would be
using it by now on some scale.

Exactly why the idea isn't used for anything much heavy duty than charging
a cell phone or a cordless toothbrush.

But system efficiency and losses were not something Tesla took into
concideration, nor was much thought put into how one whould charge
customers when they could have built the "receiver" end themselves
and obtained his electricity for free. Not a viable bussiness model.