There was a big discussion about this last year, and somebody posted that
the ARRL was going to eliminate the conjugate reference.

Tam/WB2TT



Going to? It says 2000 on that ARRL Handbook!

They are NOT going to eliminate the conjugate reference, because
it's correct.

Point of fact: in the current 20th edition, dated 2003, it has gone.

It had been correct; then they incorrectly revised it; now it has been
corrected again.


--
73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek

wrote:
However, in almost all practical calculations,
Zo is purely real, ...

Nope, "purely real" requires a special expensive line. I
forget what they call it. Ordinary feedline is not purely
real however close it might be.
--
73, Cecil http://www.qsl.net/w5dxp


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Ian White GM3SEK wrote:
There was a big discussion about this last year, and somebody posted that
the ARRL was going to eliminate the conjugate reference.

Tam/WB2TT



Going to? It says 2000 on that ARRL Handbook!

They are NOT going to eliminate the conjugate reference, because
it's correct.

Point of fact: in the current 20th edition, dated 2003, it has gone.

It had been correct; then they incorrectly revised it; now it has been
corrected again.


Point of fact: If Zo is purely real, then
Zo*=Zo, and so both forms are correct in this case.


S.

Cecil Moore wrote:
wrote:
However, in almost all practical calculations,
Zo is purely real, ...

Nope, "purely real" requires a special expensive line. I
forget what they call it. Ordinary feedline is not purely
real however close it might be.
--

I don't care how much it costs, your line
is NEVER going to be 100% purely real! There
is always a gap between mathematical ideals
and reality.

So i totally agree with you.

But for most practical calculations,
Zo can be considered purely real, and your
calculations will be close.


S.

wrote:
I don't care how much it costs, your line
is NEVER going to be 100% purely real! There
is always a gap between mathematical ideals
and reality.

Therefore, Z0 will never equal Z0*?

One can purchase test leads guaranteed within a certain
percentage at a certain frequency. I believe it occurs
when G/C = R/L or some such.
--
73, Cecil http://www.qsl.net/w5dxp


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wrote:
I don't care how much it costs, your line
is NEVER going to be 100% purely real! There
is always a gap between mathematical ideals
and reality.

Therefore, Z0 will never equal Z0*?

One can purchase test leads guaranteed within a certain
percentage at a certain frequency. I believe it occurs
when G/C = R/L or some such.
--
73, Cecil http://www.qsl.net/w5dxp


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wrote:
I don't care how much it costs, your line
is NEVER going to be 100% purely real! There
is always a gap between mathematical ideals
and reality.

Therefore, Z0 will never equal Z0*?

One can purchase test leads guaranteed within a certain
percentage at a certain frequency. I believe it occurs
when G/C = R/L or some such.
--
73, Cecil http://www.qsl.net/w5dxp


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Cecil Moore wrote:
wrote:
I don't care how much it costs, your line
is NEVER going to be 100% purely real! There
is always a gap between mathematical ideals
and reality.

Therefore, Z0 will never equal Z0*?


Never exactly, but they will be damn close
most of the time, unless your coax is really cheap/bad.



One can purchase test leads guaranteed within a certain
percentage at a certain frequency. I believe it occurs
when G/C = R/L or some such.
--
73, Cecil http://www.qsl.net/w5dxp


If Zo=50+j0.000000000001, then it's
close enough!


S.

On 20 Jun 2005 01:00:51 -0700, wrote:
If Zo=50+j0.000000000001,
And it is not
then it's close enough!
hence it follows from this logic, it is not close enough.

73's
Richard Clark, KB7QHC

Richard Clark wrote:
On 20 Jun 2005 01:00:51 -0700, wrote:
If Zo=50+j0.000000000001,
And it is not
then it's close enough!
hence it follows from this logic, it is not close enough.


Even if Zo=50+j2, then the VSWR will
still be very close to a 1:1 match.

You antenna boys don't build too many
power amplifiers, obviously.


Slick