Howdy,

These numbers are characteristic impedances of the cables. If you had an
infinite length of it all you would have to do is use an impedance meter and it
would yield the correct C. I.

It is a function of the frequency and the distributed R, L, C, and G of the
cable.

The ARRL Handbook and their antenna book can tell you much.

7e de Jack, K9CUN

It's actually Ohms with a capital OH.

:-)

Nope, it's actually ohms with a lower case oh, at least in the US.

According to the metric standard promoted by NIST and most of the world, proper
names are not capitalized, with one exception. The exception is Celsius, but
only because the correct unit is "degree Celsius" not "Celsius".

Contributing to the confusion is the standard that many symbols are capitalized
even when the spelled out unit name is not. For example, W is the symbol for
watt, Pa is the symbol for pascal, J is the symbol for joule, etc.

If this stuff actually interests anyone the reference is:

http://www.physics.nist.gov/Pubs/SP811/contents.html

73,
Gene
W4SZ

JDer8745 wrote:
It's actually Ohms with a capital OH.

:-)

On Tue, 09 Dec 2003 20:46:18 GMT, Gene Fuller
wrote:

Nope, it's actually ohms with a lower case oh, at least in the US.

Not according to the referance you gave at
http://www.physics.nist.gov/Pubs/SP811/contents.html

Quote:
6.1.2 Capitalization
Unit symbols are printed in lower-case letters except that:
(a)
the symbol or the first letter of the symbol is an upper-case letter
when the name of the unit is derived from the name of a person...

End quote.

Ohm is a name of a person.

Danny

Danny,

Sorry, please read more carefully.

Check out section 4. The units have both names and symbols. Names are not
capitalized except at the beginning of a sentence. Symbols are capitalized if
they are derived from a person's name.

Ohm is a person's name, but it is not a unit symbol. The unit symbol for
resistance is capital omega. The correct unit name for resistance is ohm.

73,
Gene
W4SZ


Dan Richardson wrote:
On Tue, 09 Dec 2003 20:46:18 GMT, Gene Fuller
wrote:


Nope, it's actually ohms with a lower case oh, at least in the US.


Not according to the referance you gave at
http://www.physics.nist.gov/Pubs/SP811/contents.html

Quote:
6.1.2 Capitalization
Unit symbols are printed in lower-case letters except that:
(a)
the symbol or the first letter of the symbol is an upper-case letter
when the name of the unit is derived from the name of a person...

End quote.

Ohm is a name of a person.

Danny

Ohm is a name of a person.

=======================

During which era did Mr Inch live?

Someone sed,

"Reg, G4FGQ observed on these pages long ago that an ordinary ohmmeter would
read Zo if connected to the end of an infinite line. He is right of course."

But the Zo of a line varies with frequency. How will the "ordinary ohmmeter"
do the job at, say, 100 kHz?

73 de jack

On Wed, 10 Dec 2003 17:35:08 +0000 (UTC), "Reg Edwards"
wrote:

Ohm is a name of a person.

=======================

During which era did Mr Inch live?


Georg Simon Ohm

Born: 16 March 1789 in Erlangen, Bavaria

"Reg, G4FGQ observed on these pages long ago that an ordinary ohmmeter
would
read Zo if connected to the end of an infinite line. He is right of
course."

But the Zo of a line varies with frequency. How will the "ordinary
ohmmeter"
do the job at, say, 100 kHz?

73 de jack

YOu should get a lot of people calling BS on the Zo changing with frequency.
It does not change at any reasonable frequency for the line. That is at
least anything below 1 ghz for coax.

Zo of ALL real, ordinary, transmission lines changes versus frequency over a
very wide frequency range.

Zo ranges over lots of thousands of ohms at a few cyles of seconds,
thousands of ohms at power frequencies, hundreds of ohms at audio
frequencies, and from tens to a few hundred ohms from 100KHz up to as many
GHz as you like.
---
Reg.


--
.................................................. ..........
Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
.................................................. ..........
"Ralph Mowery" wrote in message
...

"Reg, G4FGQ observed on these pages long ago that an ordinary ohmmeter
would
read Zo if connected to the end of an infinite line. He is right of
course."

But the Zo of a line varies with frequency. How will the "ordinary
ohmmeter"
do the job at, say, 100 kHz?

73 de jack

YOu should get a lot of people calling BS on the Zo changing with
frequency.
It does not change at any reasonable frequency for the line. That is at
least anything below 1 ghz for coax.