Balun description: who is right
 

I built an "ugly" air wound balun on a PVC water pipe according to this
description
http://www.hamuniverse.com/balun.html

I get 24 turns on a pipe having 75mm (about 3 inches) diameter measured
outside.

But recently i had the chance to look up the section in the ARRL antenna
book and there the number of windings is considerably smaller at a
higher winding radius.

Which description is right? Or does either have advantages and drawbacks?

Johann Höchtl wrote:

I built an "ugly" air wound balun on a PVC water pipe according to this
description
http://www.hamuniverse.com/balun.html

I get 24 turns on a pipe having 75mm (about 3 inches) diameter measured
outside.

But recently i had the chance to look up the section in the ARRL antenna
book and there the number of windings is considerably smaller at a
higher winding radius.

Which description is right? Or does either have advantages and drawbacks?

The optimum number of turns depends upon the band. Such a balun optimized
for 160m may not be effective on 10m and vice versa. OTOH, ferrite baluns
can be designed to function over a 10:1 frequency range by the proper
choice of the material for the toroid.
--
73, Cecil http://www.qsl.net/w5dxp


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---= East/West-Coast Server Farms - Total Privacy via Encryption =---

From MY copy of the message I sent containing the binary attachment I get no
response by clicking the program's icon or the 'paper clip'.

I get a message which says "Outlook Express has made the attachment
inaccessible". So its in my computer somewhere but I can't get at it. Not
that I want it.

At some time in the distant past I may have set OE to reject suspicious
non-standard attachments.

But out of curiosity, has anyone managed to download program SELFRES2 ?

Or has it been rejected simply because its a binary file sent via a
newsgroup?

Thank you for your cooperation.

Although the program is finished I am reluctant to make it generally
available via my website because it has not been tested against actual coils
for spurious responses in impedance resonant curves which might restrict
the operating bandwidth at the higher frequencies. It's unexpected defects
in the coils I am interested in rather than defects in the program.
----
Reg.

Reg,

I downloaded and launched the program without difficulty.

It is generally considered "unsafe" to pass around naked 'exe' files in
newsgroups. It is quite typical that newsreaders have a default to
disallow such files. I have also seen downloads of 'exe' files that came
through corrupted for some reason. I do not know why.

In any case the difficulty with bare 'exe' files is one reason that many
files are zipped up.

73,
Gene
W4SZ

(This group is set up as a non-binary group. However, there is no
mechanism that prevent binary attachments, so that would not be the
cause of the problem you report.)

Reg Edwards wrote:
From MY copy of the message I sent containing the binary attachment I get no
response by clicking the program's icon or the 'paper clip'.

I get a message which says "Outlook Express has made the attachment
inaccessible". So its in my computer somewhere but I can't get at it. Not
that I want it.

At some time in the distant past I may have set OE to reject suspicious
non-standard attachments.

But out of curiosity, has anyone managed to download program SELFRES2 ?

Or has it been rejected simply because its a binary file sent via a
newsgroup?

Thank you for your cooperation.

Although the program is finished I am reluctant to make it generally
available via my website because it has not been tested against actual coils
for spurious responses in impedance resonant curves which might restrict
the operating bandwidth at the higher frequencies. It's unexpected defects
in the coils I am interested in rather than defects in the program.
----
Reg.

"Reg Edwards" wrote in message
...

From MY copy of the message I sent containing the binary attachment I get
no
response by clicking the program's icon or the 'paper clip'.

I get a message which says "Outlook Express has made the attachment
inaccessible". So its in my computer somewhere but I can't get at it.
Not
that I want it.

At some time in the distant past I may have set OE to reject suspicious
non-standard attachments.

But out of curiosity, has anyone managed to download program SELFRES2 ?

Or has it been rejected simply because its a binary file sent via a
newsgroup?

Thank you for your cooperation.


Hi, Reg -

I am using XP. The attachment is grayed out in OE for me and is not
available. I have heard that M$ did that intentionally to minimize the
transmission of virii. If you simply rename the file extension to something
else, like SelfRes2.run perhaps, the file might then become available and
could be executed after renaming. Or you could just zip it up and it will
transfer okay.

I think. That's what I've heard, anyway.

John

"Reg Edwards" wrote in message
...

From MY copy of the message I sent containing the binary attachment I get
no
response by clicking the program's icon or the 'paper clip'.

I get a message which says "Outlook Express has made the attachment
inaccessible". So its in my computer somewhere but I can't get at it.
Not
that I want it.

At some time in the distant past I may have set OE to reject suspicious
non-standard attachments.

But out of curiosity, has anyone managed to download program SELFRES2 ?

Or has it been rejected simply because its a binary file sent via a
newsgroup?

Thank you for your cooperation.


Update...

In XP, I clicked Tools/Options then selected the Security tab. Unchecked the
"Do not allow attachments to be saved or opened...". I can get the file now.
I runs just fine.

John

non-standard attachments.

But out of curiosity, has anyone managed to download program SELFRES2 ?

Or has it been rejected simply because its a binary file sent via a
newsgroup?

Thank you for your cooperation.

Running win 98 here. The file is grayed out but this hapens alot to me. I
tell OUtlook Express ro forward the message and from there I can run and or
save the program just fine. Thanks for the many fine programs.

Hello Johann:

Loose the coax Balun, and get a toroid balun.

All the coax Baluns I have used are now used to tie up bushs for pick up
on Thrusdays morning trash pick up.

http://www.amidoncorp.com/aai_cost_baluns.htm

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


Johann Höchtl wrote:

I built an "ugly" air wound balun on a PVC water pipe according to this
description
http://www.hamuniverse.com/balun.html

I get 24 turns on a pipe having 75mm (about 3 inches) diameter measured
outside.

But recently i had the chance to look up the section in the ARRL antenna
book and there the number of windings is considerably smaller at a
higher winding radius.

Which description is right? Or does either have advantages and drawbacks?

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

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 ....

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