"Tesla coil circuits were used commercially in sparkgap radio transmitters
for wireless telegraphy until the 1920s,[1"
From: http://en.wikipedia.org/wiki/DRSSTC

But in 1929 was wrote: "It is not generally appreciated that this curious
apparatus, often associated with pretty or spectacular demonstrations of
high voltage electricity, is really a fundamental part of modern radio. For
all the tuning apparatus and circuits in every transmitting and receiving
set are simply variations of Tesla coils and Tesla coil circuits".
From: http://www.tfcbooks.com/tesla/1929-09-22.htm

Now is 2012. Is " this curious apparatus" the "fundamental part of modern
radio"? Of course in form of the " variations of Tesla coils and Tesla
coil circuits".
S*

Jeff wrote:

No and yes. Tesla coils are not used to provide high voltages and
sparks, but resonant circuits, which a Tesla coil is, are used.


On the other hand, did anyone else notice that Tesla Motors Inc, makes an
Edison designed car? :-)

Geoff.


--
Geoffrey S. Mendelson, N3OWJ/4X1GM
My high blood pressure medicine reduces my midichlorian count. :-(

On Apr 4, 2:42*am, "Szczepan Bialek" wrote:
Now is 2012. *Is " this curious apparatus" the "fundamental part of modern
radio"?

Here is a paper that will help explain the similarities:

http://hamwaves.com/antennas/inductance/corum.pdf

In Figure 2, the diagram of the Tesla coil looks identical to a 75m
mobile antenna with top hat.
--
73, Cecil, w5dxp.com

Uzytkownik "Jeff" napisal w wiadomosci
...
On 04/04/2012 08:42, Szczepan Bialek wrote:
"Tesla coil circuits were used commercially in sparkgap radio
transmitters
for wireless telegraphy until the 1920s,[1"
From: http://en.wikipedia.org/wiki/DRSSTC

But in 1929 was wrote: "It is not generally appreciated that this
curious
apparatus, often associated with pretty or spectacular demonstrations of
high voltage electricity, is really a fundamental part of modern radio.
For
all the tuning apparatus and circuits in every transmitting and receiving
set are simply variations of Tesla coils and Tesla coil circuits".
From: http://www.tfcbooks.com/tesla/1929-09-22.htm

Now is 2012. Is " this curious apparatus" the "fundamental part of
modern
radio"? Of course in form of the " variations of Tesla coils and Tesla
coil circuits".
S*



No and yes. Tesla coils are not used to provide high voltages and sparks,
but resonant circuits, which a Tesla coil is, are used.

So in your transmitters are the coils made of wires?
Where can I find the scheme of a simple todays transmitter with the coils?

S*

I think Jeff - what the problem is, is that the VEC hands out Ham Radio Licenses like purple Quaalude's at a Grateful Dead Concert.

When your only goal is to increase the number of licensed amateurs, with no concern as to the education portion of the hobby, you end up with a pool of known nothing amateurs, who's only radio set up consists of a single or multiple single or dual band walkie talkies.

Even the local REACT chapter has more money invested in their cb radios and antenna's then the actual amateur radio - Technician Class license holder today.

The burden of proof is the fact that Amateur Radio Clubs in my area are being operated by people who have had their license for less then 5 years, and by people who has no actual real knowledge of how their radio actually works.

The Technology aspect of the club environment has been changed by coffee and doughnuts. " I pity the fool that gets between those club members and the coffee pot when the meeting is over!"

Because of that, most people feels that it is not necessary to join any club, or find a Elmer once you get a license. The people who holds a license isn't qualified to be a Elmer anyways. So basically these people are free to wander the earth, hopelessly lost. Not knowing what purpose Amateur Radio really serves. The ARRL, in hopes of attracting new members, says that the purpose of Amateur Radio is to do Ecom... ONLY Ecom requires training and participation and the use of more then just a simple walkie talkie.

When all else fails - amateur radio still works. - YES
But when all else fails - if your radio equipment does not work - you go hungry, Bow Wow Wow!

People sees something or they read something or they are spoon fed from the QST Magazine they get every month from their membership from the ARRL and they see the articles in the magazine, but the magazines real purpose is to sell stuff. The advertisers is what keeps the magazine going.
I say it over and over again. They are not going to say anything bad about amplifiers - because the first ad you usually see is for some type of amplifier.

People are like Tim the Toolman Taylor - More Power arugh arugh arugh!
Only there is no one around willing to stand up on the soap box and tell them that if you have a 100 watt transceiver, to move the S meter one S unit between S - 1 and S-8, you need to increase the power 4 times / hence you need 400 watts just to move the S meter one S unit.
All signals reduce at the square of the distance away!
1200 watts is only 2 S units.
Yet everyone thinks that with a 1500 watt amplifier, you are going to set the world on fire...
That's only one S Unit - if you were 10/S-9, or two S units if you were less then S-7 with 100 watts...

The stuff that Tesla was doing, would have burned the hair off your head while you stood there and looked at it.
He was able to send electricity through the air for something like 26 miles.
The reason why we don't use Tesla's model of electric transmission is due to the fact that if we did. all we would have to do is stick a antenna up in the air and receive electricity. They wouldn't even have to meter it, because it would be so cheap. The problem is - trying to get these cheap skates to pay for it.

Now think back - gee, stick a antenna in the air and receive free electricity.
Isn't that what we are doing with Amateur Radio?
Or antenna is a electrostatically charged device.
We create power when we transmit and we receive power when we receive someone else's signal..
Maybe what Tesla didn't understand was Broadcasting!
Maybe that was the reason why his coil was dismantled at the start of WW II - because the government knew that if it fell into enemy hands, it could be used to transmit anytime, day or night, globally - any information that someone wanted to send.

Even the largest transmitters of the time - such as WLW's Big Arse Transmitter couldn't compete with the one Tesla built....
http://www.ominous-valve.com/wlw.html

Szczepan Bialek wrote:

napisa? w wiadomo?ci
...

No, you babbling moron.

A Tesla coil specifically refers to a resonant transformer specifically
designed to produce high voltages, typically much higher than 10,000
volts.

The coils in radio transmitters and receivers are part of resonant
circuits
specifically designed to provide either bandwidth limiting or impedance
matching or sometimes both.

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

The first person to NOTICE that resonance exists in a capacitor and inductor
circuit, thus forming a tuned circuit, was Felix Savary in 1826.

The first patent for a spark-gap transmitter and a receiver with tuned
circuits in them was filed by Oliver Lodge in 1897.

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.

On 4/5/2012 7:18 AM, Channel Jumper wrote:
I think Jeff - what the problem is, is that the VEC hands out Ham Radio
Licenses like purple Quaalude's at a Grateful Dead Concert.
snip crap

Even the largest transmitters of the time - such as WLW's Big Arse
Transmitter couldn't compete with the one Tesla built....
http://www.ominous-valve.com/wlw.html


And this has what to do with the subject?

Nothing at all.

tom
K0TAR

On 4/5/2012 12:08 PM, Szczepan Bialek wrote:


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*



I'm not sure where all this is heading, but always keep in mind that
there is no free lunch, and at certain locations, lunch is very
overpriced for what you actually get for your money.

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..