Now available: Program COAX_VLF

The behaviour of transmission lines at the lower frequencies is more
complex than it is at HF and above. The effects set in sooner at
higher frequencies on low impedance coaxial transmission lines. They
are affected more at higher frequencies than other types of line.

As frequency is reduced below several hundred KHz the impedance Zo
increases, its impedance angle becomes more negative, and the
propagation velocity decreases. Unusual things happen such as
reflection coefficients being greater than unity and the SWR being
greater at the input end of a line than it is at the load end.

At power and audio frequencies Zo can be an order of magnitude greater
than the nominal HF value, and the angle of Zo aproaches -45 degrees.

It is useful to be aware of the magnitude of such effects. With coax
they can be experienced in small ways at frequencies as high as 2 MHz
or more.

Download program COAX_VLF in a few seconds from website below and run
immediately. Filesize = 48 Kilo-bytes. It is both practical and
educational. Try to fathom out how reflection coefficients greater
than unity can arise.
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Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
.................................................. ..........

I have made available from my website the source code of program
COAX_VLF. It may be of interest to transmission line addicts.

Regarding the mathematics involved with the calculations you will not
find any references in your Bibles on which you appear to depend so
much.

But you may, at least, judge from the comments alongside the code what
is involved. That much may be rather obvious.

Roy and others have been criticising me for years about not disclosing
what's behind my programs in the hope of inducing me to disclose the
trade secrets. There are no secrets. Just common sense.

Well Roy, now you have it all. What do you make of it? Can you make
any sense out of it? Don't expect me to spend the next few years
trying to educate you. I havn't the time to spare. In any case I
should expect to be paid at the rate of 100 US$ per hour.

My programs are free to USA citizens. Make what use of them as you
will. And don't quibble about them on the grounds that they are
founded merely on the opinions of a foreigner.

"Patriotism is not enough" - Nurse Edith Cavell.
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Reg.

Thank yoy,

de W8CCW
On Thu, 13 Apr 2006 20:18:39 +0100, "Reg Edwards"
wrote:

I have made available from my website the source code of program
COAX_VLF. It may be of interest to transmission line addicts.

Regarding the mathematics involved with the calculations you will not
find any references in your Bibles on which you appear to depend so
much.

But you may, at least, judge from the comments alongside the code what
is involved. That much may be rather obvious.

Roy and others have been criticising me for years about not disclosing
what's behind my programs in the hope of inducing me to disclose the
trade secrets. There are no secrets. Just common sense.

Well Roy, now you have it all. What do you make of it? Can you make
any sense out of it? Don't expect me to spend the next few years
trying to educate you. I havn't the time to spare. In any case I
should expect to be paid at the rate of 100 US$ per hour.

My programs are free to USA citizens. Make what use of them as you
will. And don't quibble about them on the grounds that they are
founded merely on the opinions of a foreigner.

"Patriotism is not enough" - Nurse Edith Cavell.
----
Reg.

John Ferrell W8CCW

Reg Edwards wrote:
. . .
Roy and others have been criticising me for years about not disclosing
what's behind my programs in the hope of inducing me to disclose the
trade secrets. There are no secrets. Just common sense.
. . .

There you go again, Reg, making things up and presenting them as fact. I
challenge you to cite a single example of my criticizing you for not
disclosing your source code.

I have, on the other hand, criticized you several times for lying.
Consider this another one.

Roy Lewallen, W7EL