In message , Szczepan
Bialek writes



"The wire antennas used with crystal receivers are monopole antennas

The words "almost always, almost every time, almost invariably and
almost without exception" are missing.

As crystal receivers are normally used at low frequencies (long and
medium wave), the obvious antenna to use is an end-fed long wire
monopole. This, of course, requires a ground.

However, in principle, you could use a (probably large) dipole, provided
you modified/designed the circuit of the receiver so that it would take
a balanced input (which would probably also be low impedance).

I'm pretty sure that some of the early radar receiving systems used
essentially a dipole antenna feeding a crystal receiver.





--
Ian

Jeff wrote:


I have explained to you how it works. That explanation is correct.
Please stop adding incorrect information and asking stupid questions.

I know two stupid Poles. Are there more?


Is that the same as a dipole?

A dipole consists of two poles. As some Poles can only count to
one, they will have a different explanation.

Szczepan Bialek wrote:

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

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

They jump off from the end (corona) after the time equal to speed of
light.
They do not flow from the transmitter to the end of antenna. They kick
the
next ones. It is the oscillatory flow.

You have been told time and time again that there is no corona in normal
antenna operation.

But is in unnormal operation. When it is seen?

Only when you output kilowatts of power and there is some point in
the antenna where the voltage is very high.

I was asking on the speed of electrons in the conductor.

No you were babbling about electrons jumping off the end of the antenna
yet again.

You have also been told many times that the speed of the electrons in the
conductor is less than a slow crawl.

How stupid are you that you are told these things time and again but
you still can't understand them?

But a radio amateur knows that it is possible to transmit signals with
arbitrarily low power and that the range becomes smaller but it still
works all the time. So even with very low voltages, where there is
no corona, a transmitter still transmits.

"Leakage current is also any current that flows when the ideal current is
zero".

No, leakage current is any current that is flowing in other than the
desired or designed path.

Real current is not the ideal one.

Gibberish; you are a babbling idiot.

Szczepan Bialek wrote:

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


In AC electrons oscillate. In DC electrons are flowing for ages.
Where they come from?

No; in AC electrons periodically change directions and in DC electrons
flow in one direction only.

An antenna is a device that converts the electromagnetic energy which
antenna intercepts
into AC electrical energy at it's terminals.

A diode converts AC into DC.

The crystal radio antenna has only one terminal.

Utter nonsense.

Before the diode is AC.
After the diode is DC.
Where electrons come from?

The electrons are always in the conductors and they stay in the conductors,
they don't "come" from anywhere.

You are an ignorant, babbling, ineducable idiot who knows absolutely
NOTHING about how anything works.

An antenna is a device that converts the AC electrical energy at it's
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.

How many antennas have you built in your lifetime?

Why do you refuse to answer the question?

Is it because you have built zero antennas and you are trying to say all
the people that have successfully built hundreds that they are all wrong
and you don't want to admit you are an ignorant, inducable, idiot?

Why can't you obtain and read a university level textbook on anything
in any language?

Is it because you are too stupid to be able to understand the material?

Szczepan Bialek wrote:

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

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


In AC electrons oscillate. In DC electrons are flowing for ages.
Where they come from?

No; in AC electrons periodically change directions and in DC electrons
flow in one direction only.

An antenna is a device that converts the electromagnetic energy which
antenna intercepts
into AC electrical energy at it's terminals.

A diode converts AC into DC.

The crystal radio antenna has only one terminal. Before the diode is AC.
After the diode is DC.
Where electrons come from?
S*

There should always be a DC path around the diode, or the crystal radio
will not work.

Normally there is a tuned circuit at the input, which consists of a
coil and capacitor in parallel. The DC flows through the coil.

"The wire antennas used with crystal receivers are monopole antennas which
develop their output voltage with respect to ground. They require a return
circuit connected to ground (earth) so that the current from the antenna,
after passing through the receiver, can flow into the ground."

Unnormally you can have only the monopole antenna and the diode and ground.

What current is flowing between the diode and the ground?
Is it dependent on the distance from the transmitter?
S*

You are an ignorant, babbling, ineducable idiot who knows absolutely
NOTHING about anything.

An antenna is a device that converts the AC electrical energy at it's
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.

Since an antenna is defined in terms of it's terminals, anything that
may be connected to the terminals, such as a balun, transmission line,
or diode has NOTHING to do with what the antenna is or how the antenna
operates.

What that also means is the current flows between the antenna terminals no
matter what type of antenna it is.

How many antennas have you built in your lifetime?

Why do you refuse to answer the question?

Is it because you have built zero antennas and you are trying to say all
the people that have successfully built hundreds that they are all wrong
and you don't want to admit you are an ignorant, inducable, idiot?

Why can't you obtain and read a university level textbook on anything
in any language?

Is it because you are too stupid to be able to understand the material?

"Ian Jackson" napisal w wiadomosci
...
In message , Szczepan Bialek
writes



"The wire antennas used with crystal receivers are monopole antennas

The words "almost always, almost every time, almost invariably and almost
without exception" are missing.

As crystal receivers are normally used at low frequencies (long and medium
wave), the obvious antenna to use is an end-fed long wire monopole. This,
of course, requires a ground.

However, in principle, you could use a (probably large) dipole, provided
you modified/designed the circuit of the receiver so that it would take a
balanced input (which would probably also be low impedance).

I'm pretty sure that some of the early radar receiving systems used
essentially a dipole antenna feeding a crystal receiver.

You are right:
"A simple rectenna element consists of a dipole antenna with a diode
connected across the dipole elements." And:
"A nantenna is a very small rectenna the size of a light wave, fabricated
using nanotechnology, which acts as an "antenna" for light,"

Each rectenna arm (or dipole element) must be shorter then 1/4 WL.

But: "Where the electrons come from?
S*

Ian Jackson wrote:
In message , Szczepan
Bialek writes



"The wire antennas used with crystal receivers are monopole antennas

The words "almost always, almost every time, almost invariably and
almost without exception" are missing.

As crystal receivers are normally used at low frequencies (long and
medium wave), the obvious antenna to use is an end-fed long wire
monopole. This, of course, requires a ground.

However, in principle, you could use a (probably large) dipole, provided
you modified/designed the circuit of the receiver so that it would take
a balanced input (which would probably also be low impedance).

Or you could use a ferrite antenna with a coupling coil wound to
match the impedance.

Oh, wait, that would be a coil wound around a ferrite bar with no
ground connection whatsoever and no place for jumping electrons.

Good Lord, could it possibly work with no jumping electrons and no
ground?

I'm pretty sure that some of the early radar receiving systems used
essentially a dipole antenna feeding a crystal receiver.

Yes, some early microwave receivers were in essence crystal sets until
the components became available to build the stages necessary for a
superheterodyne receiver.

Most of the simple Gunn diode based door openers are also basically crystal
set receivers.

Where do electrons jump from in a horn antenna?

"Rob" napisa³ w wiadomo¶ci
...
Jeff wrote:


I have explained to you how it works. That explanation is correct.
Please stop adding incorrect information and asking stupid questions.

I know two stupid Poles. Are there more?


Is that the same as a dipole?

A dipole consists of two poles.

Even if one is in air and the second in the ground?
"The quarter wave monopole antenna is a single element antenna fed at one
end, that behaves as a dipole antenna"
S*

"Szczepan Bialek" wrote in message
...


Even if one is in air and the second in the ground?
"The quarter wave monopole antenna is a single element antenna fed at one
end, that behaves as a dipole antenna"
S*

Good afternoon Szczepan. I see that, after several weeks and lots of
postings, you still do not understand the difference between a monopole and
a dipole. Please also note the phrase "behaves as".
Kindest regards, Ian.

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


I was asking on the speed of electrons in the conductor.

No you were babbling about electrons jumping off the end of the antenna
yet again.

You have also been told many times that the speed of the electrons in the
conductor is less than a slow crawl.

The average speed.
The circuit with an antenna was named "open circuit" before Maxwell.
Maxwell discovered that the current is "prolongated" in the insulator
(displacement current) so the all circuits are "closed".
So at the bonduary the electrons must jump off. And come back.
In each textbooks is wrote that electrons jump off from a conductor and come
back.
But sometimes this phenomena is not symmetric.
S*