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Resonant frequency formula

K

Kevin Doyle

Jan 1, 1970
0
Hi all,
As we all know Fr of a resonant circuit is 1/(2PiSqrt(LC))
I saw in the ARRL hand book that they have this formula but have 159 where
the one is.
I also saw the use of it here>
http://www.hamradio-online.com/1999/may/w6bky-13.html
If 159 is above the line does this mean at Fr the resistance of the tank is
159 ohms?

Cheers,
Kevin.
 
A

Andrew Holme

Jan 1, 1970
0
Kevin said:
Hi all,
As we all know Fr of a resonant circuit is 1/(2PiSqrt(LC))
I saw in the ARRL hand book that they have this formula but have 159
where the one is.
I also saw the use of it here>
http://www.hamradio-online.com/1999/may/w6bky-13.html
If 159 is above the line does this mean at Fr the resistance of the
tank is 159 ohms?

No. 159 ~= 1000 / (2*pi).

They've changed the units of f, L and C from Hertz, Henrys and Farads to
MHz, uH and pF.
 
J

Jeroen Belleman

Jan 1, 1970
0
Andrew said:
No. 159 ~= 1000 / (2*pi).

They've changed the units of f, L and C from Hertz, Henrys and Farads to
MHz, uH and pF.

Yep, a fine example of an attempt to simplify things by making them
more obscure.

Stick to SI. Always.

Jeroen Belleman
 
F

Fred Bartoli

Jan 1, 1970
0
Paul Burke said:
What's your weight, then?

Stick to basic physics, always. :)
Weight is irrelevant: it doesn't depends on you only and changes everywhere
you go.

You should have asked the right question: what's your mass?
Then comes the right answer.
 
P

Paul Burke

Jan 1, 1970
0
Fred said:
You should have asked the right question: what's your mass?
Then comes the right answer.

11 o'clock at St. Mary's?

Paul Burke
 
F

Fabio G.

Jan 1, 1970
0
"Fred Bartoli"
Weight is irrelevant: it doesn't depends on you only and changes everywhere

I remember some people who confused the concept of weight and mass.

To make clear the difference I finally said: "you can think the mass as
the number atoms of an object. If you are on the moon or on the earth
the number of atoms (mass) will not change, but the weight (influenced
by the gravity force) will."

Bye

--
Per rispondermi via email sostituisci il risultato
dell'operazione (in lettere) dall'indirizzo
-*-
To reply via email write the correct sum (in letters)
in the email address
 
K

Keith Williams

Jan 1, 1970
0
7+5 said:
"Fred Bartoli"


I remember some people who confused the concept of weight and mass.

To make clear the difference I finally said: "you can think the mass as
the number atoms of an object. If you are on the moon or on the earth
the number of atoms (mass) will not change, but the weight (influenced
by the gravity force) will."

Ah, so a mole of Hydrogen has the same mass as a mole of Uranium. Got
it! ;-)
 
R

Rich The Newsgroup Wacko

Jan 1, 1970
0
Ah, so a mole of Hydrogen has the same mass as a mole of Uranium. Got
it! ;-)

Well, irregardless of what element, what do you do with the mole tunnels
on your lawn?
--
Thanks,
Rich
------
"There was a young woman named Ells
Who was subject to curious spells
When got up very oddly,
She'd cry out things ungodly
by the palms in expensive hotels."
-- Edward Gorey
 
R

Rich Grise

Jan 1, 1970
0
Ah, so a mole of Hydrogen has the same mass as a mole of Uranium. Got
it! ;-)

Well, you _do_ admit that a gram of gold has the same mass as a gram
of feathers, right?

;-)
Rich
 
K

Keith Williams

Jan 1, 1970
0
Well, you _do_ admit that a gram of gold has the same mass as a gram
of feathers, right?

....but not the same number of atoms.
 
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