Someone sed:

"So, the 300/75/50 ohm term, characteristic impedance, is the square root of
L/C"

This is an *approximation* that is useful when complex arithmetic is over the
capability of your calculator or if the imaginary components of the formula for
Zo are negligible.

At the usual HF through UHF ham frequencies the imaginary components are
negligible so the approximation suffices.

UNITS: 10-pF capacitor. 10-pF is hypenated when used as a modifier, i. e.,
adjective.

Others: 10-ft pole, 5-cent cigar, 2-dollar pistol, 12-V battery, 500-mile
track.

73 de Jack, K9CUN

JDer8745 wrote:

snip


UNITS: 10-pF capacitor. 10-pF is hypenated when used as a modifier, i. e.,
adjective.

Others: 10-ft pole, 5-cent cigar, 2-dollar pistol, 12-V battery, 500-mile
track.

73 de Jack, K9CUN


Partly correct.

The use of "10-picofarad capacitor" is preferred under the standard rules of
English and the NIST style guide. The use of "10-pF capacitor" should be
replaced by "10 pF capacitor" according to NIST.

See section 7.2 in http://www.physics.nist.gov/Pubs/SP811/contents.html

"Even when the value of a quantity is used in an adjectival sense, a space is
left between the numerical value and the unit symbol. (This rule recognizes that
unit symbols are not like ordinary words or abbreviations but are mathematical
entities, and that the value of a quantity should be expressed in a way that is
as independent of language as possible.)"

"When unit names are spelled out, the normal rules of English apply. Thus, for
example, ‘a roll of 35-millimeter film’ is acceptable."

73,
Gene
W4SZ

Jack, with all due respect, you need a hobby...


"JDer8745" wrote in message
...
Someone sed:

"So, the 300/75/50 ohm term, characteristic impedance, is the square root
of
L/C"

This is an *approximation* that is useful when complex arithmetic is over
the
capability of your calculator or if the imaginary components of the
formula for
Zo are negligible.

At the usual HF through UHF ham frequencies the imaginary components are
negligible so the approximation suffices.

UNITS: 10-pF capacitor. 10-pF is hypenated when used as a modifier, i.
e.,
adjective.

Others: 10-ft pole, 5-cent cigar, 2-dollar pistol, 12-V battery, 500-mile
track.

73 de Jack, K9CUN

w4jle wrote:

Jack, with all due respect, you need a hobby...



He was just getting his 2-cents worth in! :-)
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