"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*

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

Many modern solid state transmitters have no "coils", per se, except perhaps in the output low pass filter or output matching network. The carrier is generated from a crystal oscillator (no coils, just caps and a hunk o' rock) and amplified in broadband stages.

On 04/08/2012 09:55 AM, wrote:
Many modern solid state transmitters have no "coils", per se, except perhaps in the output low pass filter or output matching network. The carrier is generated from a crystal oscillator (no coils, just caps and a hunk o' rock) and amplified in broadband stages.



More like a switch mode power supply than a crystal oscillator, (the way
I visualize a modern AM transmitter without large coils.)

"dave" napisal w wiadomosci
m...
On 04/08/2012 09:55 AM, wrote:
Many modern solid state transmitters have no "coils", per se, except
perhaps in the output low pass filter or output matching network. The
carrier is generated from a crystal oscillator (no coils, just caps and a
hunk o' rock) and amplified in broadband stages.


More like a switch mode power supply than a crystal oscillator, (the way I
visualize a modern AM transmitter without large coils.)

Are such used by radio amateurs?
S*

Szczepan Bialek wrote:

"dave" napisal w wiadomosci
m...
On 04/08/2012 09:55 AM, wrote:
Many modern solid state transmitters have no "coils", per se, except
perhaps in the output low pass filter or output matching network. The
carrier is generated from a crystal oscillator (no coils, just caps and a
hunk o' rock) and amplified in broadband stages.


More like a switch mode power supply than a crystal oscillator, (the way I
visualize a modern AM transmitter without large coils.)

Are such used by radio amateurs?
S*

Since you haven't a clue what he is talking about, your question is
meaningless.

Most current, modern transmitters, amateur or otherwise, generate their
carrier frequency through digital frequency synthesizers referenced to
a crystal oscillator.

A small percentage of transmitters that are designed for either fixed
frequency use or use over a limited frequency range just use crystal
oscillators.

The output power is produced by amplifier stages to raise the level to the
desired output.

If there were no regulations, that would be the end of it, but since there
are regulations on spectral purity of transmitters, there are resonant
circuits somewhere before the antenna to ensure no spurious frequencies
are transmitted at a significant level.

Below microwave frequencies the resonant circuits are almost always made
of discreet inductors and capacitors forming either band pass or low pass
filters.

On 4/9/2012 4:03 AM, Szczepan Bialek wrote:
napisal w wiadomosci
m...
On 04/08/2012 09:55 AM, wrote:
Many modern solid state transmitters have no "coils", per se, except
perhaps in the output low pass filter or output matching network. The
carrier is generated from a crystal oscillator (no coils, just caps and a
hunk o' rock) and amplified in broadband stages.


More like a switch mode power supply than a crystal oscillator, (the way I
visualize a modern AM transmitter without large coils.)

Are such used by radio amateurs?
S*

On 4/9/2012 4:03 AM, Szczepan Bialek wrote:
napisal w wiadomosci
m...
On 04/08/2012 09:55 AM, wrote:
Many modern solid state transmitters have no "coils", per se, except
perhaps in the output low pass filter or output matching network. The
carrier is generated from a crystal oscillator (no coils, just caps and a
hunk o' rock) and amplified in broadband stages.


More like a switch mode power supply than a crystal oscillator, (the way I
visualize a modern AM transmitter without large coils.)

Are such used by radio amateurs?
S*



Why don't you tell us? You are the expert. Google and Wikipedia are
your friend.

tom
K0TAR

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. :-(

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*