# Resonant frequency formula

Discussion in 'Electronic Design' started by Kevin Doyle, Jun 22, 2005.

1. ### Kevin DoyleGuest

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>
If 159 is above the line does this mean at Fr the resistance of the tank is
159 ohms?

Cheers,
Kevin.

2. ### Andrew HolmeGuest

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.

3. ### Kevin DoyleGuest

Oh!
Thanks for that.

Kevin.

4. ### Jeroen BellemanGuest

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

Stick to SI. Always.

Jeroen Belleman

9.81*kg ? )

7. ### Fred BartoliGuest

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

8. ### Paul BurkeGuest

11 o'clock at St. Mary's?

Paul Burke

9. ### Fabio G.Guest

"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."

Bye

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10. ### Keith WilliamsGuest

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

11. ### Rich The Newsgroup WackoGuest

Well, irregardless of what element, what do you do with the mole tunnels
--
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

12. ### Rich GriseGuest

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

;-)
Rich

13. ### Keith WilliamsGuest

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