"Reg Edwards" wrote in message
...

With sufficient accuracy, knowing its maximum value, it is possible to
estimate the value of an air-spaced variable capacitor setting just by
looking at it.

Similarly, the value of a coil can be calculated by counting the
number of turns and guessing its length and diameter. The calculation
is simple enough.

I've done it dozens of times. It gets you into the right ballpark.
Which is quite accurate enough for amateur radio purposes. There's no
need for rocket science.

I can't understand the abysmal state of education in simple arithmetic
in our primary schools. We should import the kids who inhabit the
sewers of Rio de Janerio and other American cities and employ them as
arithmetic teachers. It would be more economic than culling by armed
police.
----
Reg, G4FGQ


I credit the California and Oklahoma Public Schools for my mathematical
illiteracy. Went to school in Bakersfield in 1947, got straight A cause the
math they taught in the 9th grade was the math I learned in Oklahoma in the
4th grade. Returned to Oklahoma in the middle of the school year and was
placed in a 2nd semester
Algebra class. Teacher was a coach who spent most of his class time working
with (on?) a female student whom he later married. Even if I had been truly
interested I'd never have been able to catch up. I was passed on even though
I was totally incompetent in Algebra.( this was before social passing became
common in the public schools)They should have adjusted my schedule and had
me start at the beginning Algebra semester even if it required some class
juggling the following year. Perhaps they thought they were doing me a
favor, or maybe they just didn't realize how retro the California school
math was.

Harold
KD5SAK