Tom, K0TAR wrote:
"Of course that still means thery aren`t resonant aince you just
displaced the "center" of the element."

Kraus describes adjustment of the phase between driven and parasitic
elements on page 320 of his 1950 edition of "Antennas":

"The parasitic element may have a fixed length of 1/2 wavelength, the
tuning being accomplished by inserting a lumped reactance in series with
the antenna at its center point."

In my case, the "lumped reactance" was a tuned stub adjusted to the
desired phase difference between parasitic and driven elements as
indicated by an RCA WM-30A phase monitor.

Best regards, Richard Harrison, KB5WZI

Cecil, W5DXP wrote:
"Trim the ladder-line until the impedance looking into the ladder-line
is purely resistive."

Sure. The line is purely resistive at resonant lengths where the power
factor is one. No reactance. A 1/2-wave is a resonant length.

Charlie Wright, an A.D. Ring and Accociates engineer used to drive our
German engineers crazy, telling them that slopes on the autobahn used
coble stones because they didn`t know how to pour concrete on an
incline.

Charlie also got to a group using an RCA WM-30A phase monitor to tune
parasiitic elements in a curtain array. Most medium-wave directional
stations at the time used a WM-30A as a phase monitor, just as shortwave
stations used them for tune-up.

Charlie had used the monitor for years and knew it had an underated
resistor which sometimes failed. The group had upended the chassis and
Charlie offered to help troubleshoot. The Germans acquiesced.

Charlie asked for voltage measurements from unrelated parts of the
circuit, took out his slide rule and feigned a few calculations. Then,
Charlie pointed to the defective resistor and said: "Change that one."

The crowd shook its collective heads but complied. The monitor
miraculously sprang to life again. Charlie chuckled to himself as he
left the incredulous crowd.

Best regards, Richard Harrison, KB5WZI

Cecil, W5DXP wrote:
"Trim the ladder-line until the impedance looking into the ladder-line
is purely resistive."

Sure. The line is purely resistive at resonant lengths where the power
factor is one. No reactance. A 1/2-wave is a resonant length.

Charlie Wright, an A.D. Ring and Accociates engineer used to drive our
German engineers crazy, telling them that slopes on the autobahn used
coble stones because they didn`t know how to pour concrete on an
incline.

Charlie also got to a group using an RCA WM-30A phase monitor to tune
parasiitic elements in a curtain array. Most medium-wave directional
stations at the time used a WM-30A as a phase monitor, just as shortwave
stations used them for tune-up.

Charlie had used the monitor for years and knew it had an underated
resistor which sometimes failed. The group had upended the chassis and
Charlie offered to help troubleshoot. The Germans acquiesced.

Charlie asked for voltage measurements from unrelated parts of the
circuit, took out his slide rule and feigned a few calculations. Then,
Charlie pointed to the defective resistor and said: "Change that one."

The crowd shook its collective heads but complied. The monitor
miraculously sprang to life again. Charlie chuckled to himself as he
left the incredulous crowd.

Best regards, Richard Harrison, KB5WZI

They can be wonderful engineers, however.....
My 999 story: A major automobile manufacturer tasked their German
branch to design a new transmission for a "sporty" car. Prototype
arrived at the proving grounds and looked anemic. Transmission was
placed into prototype car. Everyone went to see the first use. Driver
wound up the engine to red line, and loud 9 9 9 was heard as clutch was
engaged and shrapnel was produced. US engineers turned to German
engineers and said: "We told you how it would be used - now believe
us."
An antenna system was used to send data back for analysis. 73 Mac
N8TT

--
J. Mc Laughlin - Michigan USA
Home:

"Richard Harrison" wrote in message
...
Cecil, W5DXP wrote:
snip

Charlie Wright, an A.D. Ring and Accociates engineer used to drive our
German engineers crazy, telling them that slopes on the autobahn used
coble stones because they didn`t know how to pour concrete on an
incline.

Charlie also got to a group using an RCA WM-30A phase monitor to tune
parasiitic elements in a curtain array. Most medium-wave directional
stations at the time used a WM-30A as a phase monitor, just as
shortwave
stations used them for tune-up.

Charlie had used the monitor for years and knew it had an underated
resistor which sometimes failed. The group had upended the chassis and
Charlie offered to help troubleshoot. The Germans acquiesced.

Charlie asked for voltage measurements from unrelated parts of the
circuit, took out his slide rule and feigned a few calculations. Then,
Charlie pointed to the defective resistor and said: "Change that one."

The crowd shook its collective heads but complied. The monitor
miraculously sprang to life again. Charlie chuckled to himself as he
left the incredulous crowd.

Best regards, Richard Harrison, KB5WZI

They can be wonderful engineers, however.....
My 999 story: A major automobile manufacturer tasked their German
branch to design a new transmission for a "sporty" car. Prototype
arrived at the proving grounds and looked anemic. Transmission was
placed into prototype car. Everyone went to see the first use. Driver
wound up the engine to red line, and loud 9 9 9 was heard as clutch was
engaged and shrapnel was produced. US engineers turned to German
engineers and said: "We told you how it would be used - now believe
us."
An antenna system was used to send data back for analysis. 73 Mac
N8TT

--
J. Mc Laughlin - Michigan USA
Home:

"Richard Harrison" wrote in message
...
Cecil, W5DXP wrote:
snip

Charlie Wright, an A.D. Ring and Accociates engineer used to drive our
German engineers crazy, telling them that slopes on the autobahn used
coble stones because they didn`t know how to pour concrete on an
incline.

Charlie also got to a group using an RCA WM-30A phase monitor to tune
parasiitic elements in a curtain array. Most medium-wave directional
stations at the time used a WM-30A as a phase monitor, just as
shortwave
stations used them for tune-up.

Charlie had used the monitor for years and knew it had an underated
resistor which sometimes failed. The group had upended the chassis and
Charlie offered to help troubleshoot. The Germans acquiesced.

Charlie asked for voltage measurements from unrelated parts of the
circuit, took out his slide rule and feigned a few calculations. Then,
Charlie pointed to the defective resistor and said: "Change that one."

The crowd shook its collective heads but complied. The monitor
miraculously sprang to life again. Charlie chuckled to himself as he
left the incredulous crowd.

Best regards, Richard Harrison, KB5WZI

tom wrote,

About what I expected. If someone states something truthfull in this
group, no one responds. And it as a group you are all, even Roy,
obviously subject to this. No one bothered to even think about what I
originally said, or try to see the tongue in cheek.

I guess if you can't argue, it's no fun. I don't blame you all for
that, but it is interesting to observe. And sad.

tom
K0TAR


You can think of it this way, or more probably, you need to
work on your communication skills.
73,
Tom Donaly, KA6RUH

tom wrote,

About what I expected. If someone states something truthfull in this
group, no one responds. And it as a group you are all, even Roy,
obviously subject to this. No one bothered to even think about what I
originally said, or try to see the tongue in cheek.

I guess if you can't argue, it's no fun. I don't blame you all for
that, but it is interesting to observe. And sad.

tom
K0TAR


You can think of it this way, or more probably, you need to
work on your communication skills.
73,
Tom Donaly, KA6RUH

Tdonaly wrote:

You can think of it this way, or more probably, you need to
work on your communication skills.
73,
Tom Donaly, KA6RUH


I've been here long enough to know that it's mostly that a lot of people
here like to argue. And while I may need to work on my comm skills, it
doesn't change that fact at all. Like I said, sad.

tom
K0TAR

Tdonaly wrote:

You can think of it this way, or more probably, you need to
work on your communication skills.
73,
Tom Donaly, KA6RUH


I've been here long enough to know that it's mostly that a lot of people
here like to argue. And while I may need to work on my comm skills, it
doesn't change that fact at all. Like I said, sad.

tom
K0TAR

tom wrot,
Message-id:

Tdonaly wrote:

You can think of it this way, or more probably, you need to
work on your communication skills.
73,
Tom Donaly, KA6RUH


I've been here long enough to know that it's mostly that a lot of people
here like to argue. And while I may need to work on my comm skills, it
doesn't change that fact at all. Like I said, sad.

tom
K0TAR


What's wrong with wanting to argue? Argument, sometimes even violent argument,
has
been a hallmark of Western science for a long time. People who take everything

at face value, without question or disagreement, end up believing the strangest
things.
73,
Tom Donaly, KA6RUH