Reg Edwards wrote:

Johann,

Practically ANYTHING will do for a coaxial or similar choke balun. It's the
most uncritical component in the whole of radio engineering.


....



I have a program which does the calculations but which I have not yet fully
tested except for the resonant frequency. So it is not yet available from my
website.

I have attached small program (43 kilo-bytes) named SELFRES2 to this
message, for which I may be reprimanded. It is not zipped up. You should be
able to run it immediately after download just by clicking its icon. Let's
see.

Thank you very much for your in depth explanaition. The program worked
just fine.

I am not a "hamer" but do CB-radio and the only thing which is legal
there is to play around with different antenna types. I am still
starting to get into the whole matter by reading books and info on the
internet.

What do you get?

I get a self resonance frequency of 23MHz and ~ 9 kOhm @ 28MHz test
frequency. For CB radio this should be pretty much sufficient, though
now i would try to get resonance frequency closer to operation frequency.

----
Reg, G4FGQ

Johann Höchtl wrote:

Jay in the Mojave wrote:

Hello Johann:

Loose the coax Balun, and get a toroid balun.


After replacing the coax balun, with the Amodon 1 to 1 HBH50 current
type balun, on my yagi beams it was like night and day. Ten-4.

Jay in the Mojave


Did you throw it because of signal loss or because the coax balun did
not worked as expected, so what a balun (balanced -- unbalanced) is
meant to be?

It's not all about that i really need a balun when running a dipole
antenna and rg58 but i fear RIF with neighbors ....

Hello Johann:

The Yagi beam antenna with the coax coil balun, showed very little
change in SWR as compared to significant changes in the driven element
lengths. Regardless to the amount of cussing, different type of coax
coiled configurations and such, beer bottles thrown at the tower, or
facing east produced a poor antenna pattern, and signal straight.

When the Amaidon 1 to 1 Current Balun was installed, this all went away.
The SWR could now be changed by lengths in the driven and parasitic
elements, the signal strength went to where is was supposed to,
referenced to a dipole antenna, and the beams pattern sharpen up.

The coiled up coax balun, was allowing RF Energy to travel down the coax
resulting in detuning the antenna significantly.

Jay in the Mojave

Richard Clark wrote:

On Wed, 03 Nov 2004 01:17:33 GMT, "John Smith"
wrote:

In XP, I clicked Tools/Options then selected the Security tab. Unchecked the
"Do not allow attachments to be saved or opened..."


Hi John,

You are now standing at the edge of the abyss.

73's
Richard Clark, KB7QHC

As someone with well over 10000 customers, I can assure you that Richard
is correct.

There was also announced today, an exploit that doesn't even need you to
click on it if you run, gasp!, Microsoft clients.

Here is the link to the story-

http://software.silicon.com/security...9125549,00.htm

and here is a link to the slashdot discussion of it -

http://it.slashdot.org/article.pl?si...id=201&tid=218

I also have to admit that the exploit needs a dummy on the receiving end
to complete the circuit by having poor judgement/settings. They may be
able to write it to be better yet, though, and I'm hoping against hope, not.

tom
K0TAR

John and Ralph,

Thanks very much for the likely explanations. We live and learn!

Johann, the intended primary recipient, also downloaded the attachment OK.

So all's well that ends well.
----
Reg.

"Tom Ring" wrote in message
. ..
Richard Clark wrote:

On Wed, 03 Nov 2004 01:17:33 GMT, "John Smith"
wrote:

In XP, I clicked Tools/Options then selected the Security tab. Unchecked
the "Do not allow attachments to be saved or opened..."


Hi John,

You are now standing at the edge of the abyss.

73's
Richard Clark, KB7QHC

As someone with well over 10000 customers, I can assure you that Richard
is correct.

There was also announced today, an exploit that doesn't even need you to
click on it if you run, gasp!, Microsoft clients.

Here is the link to the story-

http://software.silicon.com/security...9125549,00.htm

and here is a link to the slashdot discussion of it -

http://it.slashdot.org/article.pl?si...id=201&tid=218

I also have to admit that the exploit needs a dummy on the receiving end
to complete the circuit by having poor judgement/settings. They may be
able to write it to be better yet, though, and I'm hoping against hope,
not.

tom
K0TAR

Thanks, Richard and Tom, for your concern. I forgot to say that I
immediately turned that feature back on.

I also use Poptray to examine any mail before actually downloading with OE.
It's amazing how easy it is to spot unwanted emails.

73,
John