On Fri, 24 Oct 2003 16:11:30 -0400, wrote:

snip
The X-terminator has its main lobe at bit higher angle than the whip
does. That may account for some of the differences.

Chrome has about the same conductivity that Stainless does, or at
least from the info I found. 3-15% for Stainless, 19% for chrome,
relative to copper.

I'll have to go through the archives to find the numbers but chrome is
a better conductor than Stainless


Chrome has 74.3% the conductivity of copper

Stainless Steel has 3% the conductivity of copper

On Fri, 24 Oct 2003 17:48:23 GMT, lancer wrote:

On Thu, 23 Oct 2003 16:22:18 -0400, wrote:


Actually it's 62"..........If you can wait a second I'll give you the
entire dimensions. Maybe Mmana wants to know?

Tnom;

I plugged in the values that you posted. By simulation, the
Stainless whip has just about a 1 dB edge. The S/S whip has its main
lobe at 27.9 degrees, the X-terminator at 31.2 degrees. I posted a
current plot for it in:

alt.binaries.pictures.radio

I played with the parameters for the coils, and one coil works just as
well as the 2. Guess it just doesn't look as cool?

Did you use the proper conductivity values.

Stainless = 3% of copper

Chrome = 74.3% of copper

On Fri, 24 Oct 2003 16:09:25 -0400, wrote:

On Fri, 24 Oct 2003 17:48:23 GMT, lancer wrote:

On Thu, 23 Oct 2003 16:22:18 -0400, wrote:


Actually it's 62"..........If you can wait a second I'll give you the
entire dimensions. Maybe Mmana wants to know?

Tnom;

I plugged in the values that you posted. By simulation, the
Stainless whip has just about a 1 dB edge. The S/S whip has its main
lobe at 27.9 degrees, the X-terminator at 31.2 degrees. I posted a
current plot for it in:

alt.binaries.pictures.radio

I played with the parameters for the coils, and one coil works just as
well as the 2. Guess it just doesn't look as cool?

I don't disagree with what Mmana says but, there is no antenna
simulation program that can give the definitive answer for how a
antenna will actually perform in a real installation.

In other words when a engineer plugs in his values when designing a
new product he can never just rely on the computer or that design as
the final product. If he is to give performance numbers on the product
he can never use the computed values. He must use the measured
values. The measured value is always the most direct and accurate way
to evaluate a product.

I did notice when I was playing with the parameters on that
antenna, that a small change in the coils or element lengths made a
fairly significant change in expected gain, swr, etc. Most center
loaded, or any shortened antenna is a little more touchy about tuning,
ground and proximity to metal surfaces than a 1/4 would be.
Thanks, was a good Friday project.

In , lancer wrote:

snip
Chrome has about the same conductivity that Stainless does, or at
least from the info I found. 3-15% for Stainless, 19% for chrome,
relative to copper.

I'm not sure, I'll check it and get back on that.







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In , "(Scott Unit 69)"
wrote:


(Twistedhed) wrote:
wrote:
But what about what Frank said?

Irrelevant.
_
You know Tnom's test was a sham.
_
Countered by.....Frank's claims? THAT is your claim that Tnom's
presentation is a sham?

I just

don't like to see people get cheated.

_
It's way beyond that on this group,,,,this is about one who prefers
Chevy, one prefers Ford, and yet another prefers Dodge. The margin of
difference when applied to the average cber will not be noticeable
between the the antennas. The actual "cheating" taking place, if indeed
such a thing is to be found among a discussion forum, are the posts of
malicious and angry origin, unprovokingly attacking one's character by
name, contacting their work, and intentional libelous content of posts.
Of course, we can always add the scumbags that post under different nics
and play both sides of the fence......


I am not trying to play both sides of the fence Twist, you know me and my
CB background. But when it comes to the truth about a product there should
be no "fence" that divides us, only the truth.

And truth is Twisty's friend!!!






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In , lancer wrote:

snip
Chrome has about the same conductivity that Stainless does, or at
least from the info I found. 3-15% for Stainless, 19% for chrome,
relative to copper.

For a conductor 102" long with a diameter of 0.625", the following metals have
the following AC resistance at 27 MHz:

Chromium .0194 ohms
Copper .00711 ohms
S. Steel .0451 ohms








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On Fri, 24 Oct 2003 22:23:48 -0700, Frank Gilliland
wrote:

In , lancer wrote:

snip
Chrome has about the same conductivity that Stainless does, or at
least from the info I found. 3-15% for Stainless, 19% for chrome,
relative to copper.

For a conductor 102" long with a diameter of 0.625", the following metals have
the following AC resistance at 27 MHz:

Chromium .0194 ohms
Copper .00711 ohms
S. Steel .0451 ohms

************************************************** **********
Chromium .0194 ohms ?
Copper .00711 ohms ?

With these figures Chrome has 36% the conductivity of copper
************************************************** ************

Stainless steel is definitely more resistive than
you stated. According to your figure SS has 16%
the conductivity of copper. This is not even close.
Standard carbon steel has10% the conductivity.
Stainless is less. 18-8 is 2.5%, 13-cr is 3.5%, and
18-cr is 3%

The conductivity of the above figures on steel and
stainless steel come from the "Metals" properties table,
page 40, Ugly's electrical reference. George V. Hart

On Fri, 24 Oct 2003 22:23:48 -0700, Frank Gilliland
wrote:

In , lancer wrote:

snip
Chrome has about the same conductivity that Stainless does, or at
least from the info I found. 3-15% for Stainless, 19% for chrome,
relative to copper.

For a conductor 102" long with a diameter of 0.625", the following metals have
the following AC resistance at 27 MHz:

Chromium .0194 ohms
Copper .00711 ohms
S. Steel .0451 ohms

http://www.amm.com/index2.htm?/ref/conduct.HTM

Chrome has 55% the conductivity of copper

Steel (all types ) 3% - 15%

On Sat, 25 Oct 2003 02:21:12 -0400, wrote:

On Fri, 24 Oct 2003 22:23:48 -0700, Frank Gilliland
wrote:

In , lancer wrote:

snip
Chrome has about the same conductivity that Stainless does, or at
least from the info I found. 3-15% for Stainless, 19% for chrome,
relative to copper.

For a conductor 102" long with a diameter of 0.625", the following metals have
the following AC resistance at 27 MHz:

Chromium .0194 ohms
Copper .00711 ohms
S. Steel .0451 ohms

http://www.amm.com/index2.htm?/ref/conduct.HTM

Chrome has 55% the conductivity of copper

Steel (all types ) 3% - 15%

17-7 ph stainless steel is used for most stainless antennas

Its resistivity compared to the standard (copper) can be found here
http://www.hpmetals.com/elec_resist.asp

Copper = 1.71 microohm-cm

17-7 ph = 83 microohm-cm

In other words stainless antenna stock has 2% the conductivity of
copper.

http://www.amm.com/index2.htm?/ref/conduct.HTM

Chrome has 55% the conductivity of copper

Steel (all types ) 3% - 15%

17-7 ph stainless steel is used for most stainless antennas

Its resistivity compared to the standard (copper) can be found here
http://www.hpmetals.com/elec_resist.asp

Copper = 1.71 microohm-cm

17-7 ph = 83 microohm-cm

In other words stainless antenna stock has 2% the conductivity of
copper.


What type of material is the whip of the exterminator? SS right, the few
inches of copper or chrome material of that antenna will make little or
no difference what so ever, you guys are nit picking about something that
in this application is un noticeable.

Yes the whip is SS, but unlike your imagined explanation the antennas
others attributes must be making a difference. It does "make a
little difference". That was you quote by the way.

If it "makes a little difference" and does it at five feet instead of
nine then I would say it makes quit a difference.