Szczepan Bialek wrote:

"W5DXP" napisal w wiadomosci
...
On Saturday, July 28, 2012 2:15:21 PM UTC-5, Szczepan Bialek wrote:
AC is in oscillating circuit (closed circuit). RF current is in an
antenna (open circuit).

RF *IS* AC.

Yes. But RF CURRENT is: " "Electric currents that oscillate at radio
frequencies have special
properties not shared by direct current or alternating current of lower
frequencies. The energy in an RF current can radiate off a conductor into
space as electromagnetic waves (radio waves); this is the basis of radio
technology."

Where ever you got this piece of trash quote, it is wrong just like all
your ancient quotes from over a hundred years ago.

AC of any frequency can radiate off a conductor into space as
electromagnetic waves.

Now are also ULF transmitters (30Hz). So the above is not precise.
What decide that "an RF current can radiate off a conductor into space"?

That the AC is applied to an appropriate antenna.

That is the purpose of an antenna, to convert AC into electromagnetic waves.

For the third time, AC of any frequency can radiate off a conductor into
space as electromagnetic waves.

There is no minimum frequency.

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


AC of any frequency can radiate off a conductor into space as
electromagnetic waves.

The condenser also radiate?
http://educypedia.karadimov.info/lib...entstehung.gif


Now are also ULF transmitters (30Hz). So the above is not precise.
What decide that "an RF current can radiate off a conductor into space"?

That the AC is applied to an appropriate antenna.

What the appropriate antenna looks like?

That is the purpose of an antenna, to convert AC into electromagnetic
waves.

For the third time, AC of any frequency can radiate off a conductor into
space as electromagnetic waves.

There is no minimum frequency.

Is an antenna the open circuit?
S*

"Szczepan Bialek" wrote in message
...


AC of any frequency can radiate off a conductor into space as
electromagnetic waves.

The condenser also radiate?
http://educypedia.karadimov.info/lib...entstehung.gif

Now are also ULF transmitters (30Hz). So the above is not precise.
What decide that "an RF current can radiate off a conductor into
space"?

That the AC is applied to an appropriate antenna.

What the appropriate antenna looks like?
That is the purpose of an antenna, to convert AC into electromagnetic
waves.

For the third time, AC of any frequency can radiate off a conductor into
space as electromagnetic waves. There is no minimum frequency.

Is an antenna the open circuit?
S*

Hello Szczepan.
" The condenser also radiate? "
Try asking on sci.physics.electromag. If the diagram is trying to equate a
capacitor to an antenna then I'd not agree with that at all.
" What the appropriate antenna looks like?"
It would be an antenna that matches to the transmitter. You wouldn't use an
antenna that is a mismatch as this would defeat the purpose of the antenna.
" Is an antenna the open circuit?"
From my viewpoint it is not. "Open circuit" = "no current" and we know that
antennas carry a current.

Several postings have recommended that you acquire a textbook. I have a
suspicion that you already have one ....

Regards, Ian.

"Ian" napisa³ w wiadomo¶ci
...
"Szczepan Bialek" wrote in message
...


AC of any frequency can radiate off a conductor into space as
electromagnetic waves.

The condenser also radiate?
http://educypedia.karadimov.info/lib...entstehung.gif

Now are also ULF transmitters (30Hz). So the above is not precise.
What decide that "an RF current can radiate off a conductor into
space"?

That the AC is applied to an appropriate antenna.

What the appropriate antenna looks like?
That is the purpose of an antenna, to convert AC into electromagnetic
waves.

For the third time, AC of any frequency can radiate off a conductor into
space as electromagnetic waves. There is no minimum frequency.

Is an antenna the open circuit?
S*

Hello Szczepan.
" The condenser also radiate? "
Try asking on sci.physics.electromag. If the diagram is trying to equate a
capacitor to an antenna then I'd not agree with that at all.

It is known from Hertz experiment. He used plates or balls.
Of course the plates are as on the diagram.

" What the appropriate antenna looks like?"
It would be an antenna that matches to the transmitter. You wouldn't use
an
antenna that is a mismatch as this would defeat the purpose of the
antenna.
" Is an antenna the open circuit?"
From my viewpoint it is not. "Open circuit" = "no current" and we know
that
antennas carry a current.

"Well, the antenna end, we have an Open Circuit - so the point with the
Highest Voltage"
From: http://www.telecomhall.com/what-is-antenna.aspx
S*

"Szczepan Bialek" wrote in message
...
| |
| It is known from Hertz experiment. He used plates or balls.
| Of course the plates are as on the diagram.
| | S*
|
What frequency did Hertz use?
Regards, Ian.

Szczepan Bialek wrote:

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


AC of any frequency can radiate off a conductor into space as
electromagnetic waves.

The condenser also radiate?
http://educypedia.karadimov.info/lib...entstehung.gif

No.

This depicts electorstatic fields; antennas radiate electromagnetic
fields, so your question makes no sense.

Now are also ULF transmitters (30Hz). So the above is not precise.
What decide that "an RF current can radiate off a conductor into space"?

That the AC is applied to an appropriate antenna.

What the appropriate antenna looks like?

It makes no difference what the antenna looks like as the only property
that matters is its ability to convert AC electrical energy at the input
frequency to electromagnetic radiation.

That is the purpose of an antenna, to convert AC into electromagnetic
waves.

For the third time, AC of any frequency can radiate off a conductor into
space as electromagnetic waves.

There is no minimum frequency.

Is an antenna the open circuit?

No.

An antenna is a device that converts the AC electrical energy at its
teminals into electromagnetic energy which radiates from the antenna
and also coverts the electromagnetic energy which antenna intercepts
into AC electrical energy at it's terminals.

Do you wear slip on shoes?

napisa³ w wiadomo¶ci
...

An antenna is a device that converts the AC electrical energy at its
teminals into electromagnetic energy which radiates from the antenna
and also coverts the electromagnetic energy which antenna intercepts
into AC electrical energy at it's terminals.

Radiates = jumps off?
S*

Szczepan Bialek wrote:

napisa³ w wiadomo¶ci
...

An antenna is a device that converts the AC electrical energy at its
teminals into electromagnetic energy which radiates from the antenna
and also coverts the electromagnetic energy which antenna intercepts
into AC electrical energy at it's terminals.

Radiates = jumps off?
S*

Only in Poland.

Szczepan Bialek wrote:

napisa? w wiadomo?ci
...

An antenna is a device that converts the AC electrical energy at its
teminals into electromagnetic energy which radiates from the antenna
and also coverts the electromagnetic energy which antenna intercepts
into AC electrical energy at it's terminals.

Radiates = jumps off?

No, to issue or emerge in rays or waves.

Do you wear slip on shoes?

On Monday, July 30, 2012 1:44:55 PM UTC-5, Szczepan Bialek wrote:
Radiates = jumps off?

You already know the answer. Radiates = photons emitted from the free electrons on the surface of the conductors of the antenna system.
--
73, Cecil, w5dxp.com