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.

napisa³ w wiadomo¶ci
...
Szczepan Bialek wrote:

"Jeff" napisal w wiadomosci
...


So I modify may question: "Are in today transmitters the "variations of
Tesla
coils" or the "variations of Marx generators".
Or "is possible to do the transmitter without coils"?
If Yes, when was the first?

I have never seen a transmitter (even that in a mobile phone).
S*

Neither, some of Tesla's equipment may have made use resonance, but they
are not the root of resonant circuits used in modern equipment.
ie Tesla coils did not turn into the circuits used today.

"is possible to do the transmitter without any coils"?
S*

Yes.

Microwave transmitters routinely use resonant devices other than coils and
capacitors.

Yes. It was impossible to "make" the microwave frequency using coils.
Magnetrons are for it.

But are the modern radio waves (ham) transmitters without any coils?
S*

Uzytkownik "Jeff" napisal w wiadomosci
...

Microwave transmitters routinely use resonant devices other than coils
and
capacitors.

Yes. It was impossible to "make" the microwave frequency using coils.
Magnetrons are for it.

But are the modern radio waves (ham) transmitters without any coils?
S*


Generally they have coils, but NOT Tesla coils, it would be possible to
not use coils, but it not usual. (Depending on what you call a coil,
inductance would be a better word, as this can be generated in ways other
than what would normally be termed a 'coil'.)

A coil is made of a wire.
Are "magnetrons" or simmilar device for yours transmitters?
S*

Szczepan Bialek wrote:

napisa? w wiadomo?ci
...
Szczepan Bialek wrote:

"Jeff" napisal w wiadomosci
...


So I modify may question: "Are in today transmitters the "variations of
Tesla
coils" or the "variations of Marx generators".
Or "is possible to do the transmitter without coils"?
If Yes, when was the first?

I have never seen a transmitter (even that in a mobile phone).
S*

Neither, some of Tesla's equipment may have made use resonance, but they
are not the root of resonant circuits used in modern equipment.
ie Tesla coils did not turn into the circuits used today.

"is possible to do the transmitter without any coils"?
S*

Yes.

Microwave transmitters routinely use resonant devices other than coils and
capacitors.

Yes. It was impossible to "make" the microwave frequency using coils.

No, it is not "impossible", just more difficult the higher in frequency
you go.

At lower microwave frequencies it is a coin toss whether to use coils
and capacitors or other things.

Magnetrons are for it.

Magnetrons are not relevevant to the question.

But are the modern radio waves (ham) transmitters without any coils?
S*

It is possible, at least at low HF, but not practical in general.

You are babbling.

Szczepan Bialek wrote:

Uzytkownik "Jeff" napisal w wiadomosci
...

Microwave transmitters routinely use resonant devices other than coils
and
capacitors.

Yes. It was impossible to "make" the microwave frequency using coils.
Magnetrons are for it.

But are the modern radio waves (ham) transmitters without any coils?
S*


Generally they have coils, but NOT Tesla coils, it would be possible to
not use coils, but it not usual. (Depending on what you call a coil,
inductance would be a better word, as this can be generated in ways other
than what would normally be termed a 'coil'.)

A coil is made of a wire.

Well, usually but not necessarily.

Are "magnetrons" or simmilar device for yours transmitters?
S*

Magnetrons are microwave oscillators and impractical to build much below
1 GHz.

Magnetrons have nothing to do with coils of any kind.

You are babbling.

Jeff is right, inductance would be the correct term but you want a coil made
of wire...Well what do you call a strip line used in VHF & UHF & beyond in
Ham Transmitters...I'm referring to a straight piece of wire (strip line)
that is not a coil & has no turns....Now you have your answer, it is
possible & is done with no coils...Howard K0ACF
"Szczepan Bialek" wrote in message
...

Uzytkownik "Jeff" napisal w wiadomosci
...

Microwave transmitters routinely use resonant devices other than coils
and
capacitors.

Yes. It was impossible to "make" the microwave frequency using coils.
Magnetrons are for it.

But are the modern radio waves (ham) transmitters without any coils?
S*


Generally they have coils, but NOT Tesla coils, it would be possible to
not use coils, but it not usual. (Depending on what you call a coil,
inductance would be a better word, as this can be generated in ways other
than what would normally be termed a 'coil'.)

A coil is made of a wire.
Are "magnetrons" or simmilar device for yours transmitters?
S*

On 04/07/2012 10:35 PM, Howard K0ACF wrote:
Jeff is right, inductance would be the correct term but you want a coil made
of wire...Well what do you call a strip line used in VHF& UHF& beyond in
Ham Transmitters...I'm referring to a straight piece of wire (strip line)
that is not a coil& has no turns....Now you have your answer, it is
possible& is done with no coils...Howard K0ACF
"Szczepan wrote in message
...

Uzytkownik napisal w wiadomosci
...

Microwave transmitters routinely use resonant devices other than coils
and
capacitors.

Yes. It was impossible to "make" the microwave frequency using coils.
Magnetrons are for it.

But are the modern radio waves (ham) transmitters without any coils?
S*


Generally they have coils, but NOT Tesla coils, it would be possible to
not use coils, but it not usual. (Depending on what you call a coil,
inductance would be a better word, as this can be generated in ways other
than what would normally be termed a 'coil'.)

A coil is made of a wire.
Are "magnetrons" or simmilar device for yours transmitters?
S*




The word is inductor. At certain frequencies inductors take the form of
coils. At high UHF the inductors take the form of hairpins (aka Bobby
pins) a half of a loop.

Tesla lives in every old car with a distributor

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*