In view of the nil replies to the following posting it's safe to say that's
another old wives' tale which bites the dust.

The next ingrained tale on the list is the so-called SWR meter nonsense
versus the TLI.

=========================

A TALE OF TWO OLD WIVES

There are two cantankerous old wives:

One old wife asserts it is obvious radiation occurs mainly from the middle
portion of a dipole because that's where the current is strongest and the
magnetic field is most concentrated.

The other old wife asserts it is obvious radiation occurs mainly from the
ends of a dipole because that's where the highest voltages occur and the
electric field is most intense.

Since the pair of arguments are logically identical in form they are of
equal validity. But because it is impossible to reconcile the two women
.....
they cannot BOTH be right .... only one conclusion can be drawn ...

... both arguments are false!

The old wives are telling tales. Citizens - drag 'em off to that old
English
custom - the ducking stool.

"Reg Edwards" wrote in message
...
In view of the nil replies to the following posting it's safe to say
that's
another old wives' tale which bites the dust.

The next ingrained tale on the list is the so-called SWR meter nonsense
versus the TLI.

=========================

A TALE OF TWO OLD WIVES

There are two cantankerous old wives:

One old wife asserts it is obvious radiation occurs mainly from the
middle
portion of a dipole because that's where the current is strongest and
the
magnetic field is most concentrated.

The other old wife asserts it is obvious radiation occurs mainly from
the
ends of a dipole because that's where the highest voltages occur and the
electric field is most intense.

Since the pair of arguments are logically identical in form they are of
equal validity. But because it is impossible to reconcile the two women
....
they cannot BOTH be right .... only one conclusion can be drawn ...

... both arguments are false!

The old wives are telling tales. Citizens - drag 'em off to that old
English
custom - the ducking stool.

Reg:

Compared to current, voltage is just so ephemeral....

Voltage is a line integral, it depends upon the path over which one
evaluates the integral.

While current is something more substantial... one does not have to
plan the path of integration to know the current.

What?

--
Peter K1PO


"Reg Edwards" wrote in message
...
In view of the nil replies to the following posting it's safe to say
that's
another old wives' tale which bites the dust.

The next ingrained tale on the list is the so-called SWR meter nonsense
versus the TLI.

=========================

A TALE OF TWO OLD WIVES

There are two cantankerous old wives:

One old wife asserts it is obvious radiation occurs mainly from the
middle
portion of a dipole because that's where the current is strongest and
the
magnetic field is most concentrated.

The other old wife asserts it is obvious radiation occurs mainly from
the
ends of a dipole because that's where the highest voltages occur and the
electric field is most intense.

Since the pair of arguments are logically identical in form they are of
equal validity. But because it is impossible to reconcile the two women
....
they cannot BOTH be right .... only one conclusion can be drawn ...

... both arguments are false!

The old wives are telling tales. Citizens - drag 'em off to that old
English
custom - the ducking stool.

Reg Edwards wrote:
In view of the nil replies to the following posting it's safe to say that's
another old wives' tale which bites the dust.

Reg, we have a clear example of where the high voltage part of the
antenna is not allowed to radiate (much). That would be a balanced
top hat. Not allowing the high voltage part of the antenna to radiate
leaves the high current part to do most of the radiating. We know from
field strength measurements that a mobile antenna with a balanced top
hat can radiate as well (or better than) an antenna equipped with a
radiating high voltage top section.

If you keep the high voltage portion of the antenna and replace the
high current portion with an antenna tuner, the field strength falls
by some 12 dB.

Lengthening the high current section under the loading coil has a
much greater effect than lengthening the high-voltage section on top
of the loading coil.
--
73, Cecil http://www.qsl.net/w5dxp



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Cec, I don't doubt your experimental results. It's your extrapolated
imagination and logic which worries me. ;o)
----
Yours, Reg.

Reg Edwards wrote:
Cec, I don't doubt your experimental results. It's your extrapolated
imagination and logic which worries me. ;o)

I didn't imagine those experimental results, Reg, and all I did was
report those results. My logic tells me that there is a grain of
valid circumstantial evidence in there somewhere.

What you need to do to prove your point is present an antenna where the
high-current portion is prohibited from radiating yet still yields a
high field strength.

Example #1: The top half of an electrical 1/4WL antenna is prohibited
from radiating by a balanced top hat. Field strength results are
similar to a 1/4WL monopole. This has already been presented.

Example #2: The bottom half of an electrical 1/4WL antenna is
prohibited from radiating by _________________. Fill in the blank
and prove that field strength results are similar to a 1/4WL monopole.
That's all you need to do to make a believer (instead of a doubter)
out of me.
--
73, Cecil http://www.qsl.net/w5dxp



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Its the voltage parts of the antenna which do the radiating.

That is proved by cutting off the top part of the antenna and replacing it
with a top hat which has a much larger capacitance so it radiates the power
harder.
---
Reg.

Reg Edwards wrote:
Its the voltage parts of the antenna which do the radiating.

That is proved by cutting off the top part of the antenna and replacing it
with a top hat which has a much larger capacitance so it radiates the power
harder.

Reg, let's say we have an elevated antenna system where the radial system
and top hat system are identical and balanced. Energy flows back and
forth between the radials and top hat. Very little energy is radiated
from either the top hat or the radials since they are balanced. Virtually
all of the radiated energy comes from the high-current vertical portion
of the antenna.

Such antennas are described in Appendix II - Short Ground-Mounted Verticals
in _Building_and_Using_Baluns_and_Ununs_ by Jerry Sevick, w2fmi.
--
73, Cecil http://www.qsl.net/w5dxp



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Cec, who's Jerry Sevick. I don't seem to have a copy of his works around me
at present.
---
Reg.

Cecil Moore wrote:

Reg, we have a clear example of where the high voltage part of the
antenna is not allowed to radiate (much). That would be a balanced
top hat. Not allowing the high voltage part of the antenna to radiate
leaves the high current part to do most of the radiating.

Cecil,

Reg makes a good point. We know that the same amplitude (less ohmic
losses) of current travels the entire length of the antenna in both
directions. The relative phase of forward and reverse currents simply
makes the superposition of the two currents greater at one end than
another. We might measure the standing wave current with an ammeter,
but it is the traveling wave currents which radiate.

73, Jim AC6XG