Resonant frequency formula

K

Kevin Doyle

Guest
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.
 
Kevin Doyle wrote:
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?
Click to expand...
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.

Cheers,
Kevin.
Click to expand...
 
Oh!
Thanks for that.

Kevin.
"Andrew Holme" <andrew@nospam.com> wrote in message
news:d9clk0$lo1$1$830fa79d@news.demon.co.uk...
Kevin Doyle wrote:
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.


Cheers,
Kevin.
Click to expand...
 
Andrew Holme wrote:
Kevin Doyle wrote:

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.


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

Stick to SI. Always.

Jeroen Belleman
 
On Thu, 23 Jun 2005 08:21:41 +0100, Paul Burke <paul@scazon.com> wrote:

Jeroen Belleman wrote:

Stick to SI. Always.

What's your weight, then?
Click to expand...
9.81*kg ? :))
 
"Paul Burke" <paul@scazon.com> a écrit dans le message de
news:3hv6seFiuk3qU2@individual.net...
Jeroen Belleman wrote:

Stick to SI. Always.

What's your weight, then?
Click to expand...
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.

--
Thanks,
Fred.
 
Fred Bartoli wrote:

You should have asked the right question: what's your mass?
Then comes the right answer.
Click to expand...
11 o'clock at St. Mary's?

Paul Burke
 
"Fred Bartoli"
<fred._canxxxel_this_bartoli@RemoveThatAlso_free.fr_AndThisToo> ha

Weight is irrelevant: it doesn't depends on you only and changes everywhere
Click to expand...
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
 
In article <rk63c1dpvr8lcu8vai85tbt0hupt08pemq@4ax.com>, 7+5
@supereva.it says...
"Fred Bartoli"
fred._canxxxel_this_bartoli@RemoveThatAlso_free.fr_AndThisToo> ha

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

--
Keith
 
On Tue, 28 Jun 2005 15:45:27 -0400, Keith Williams wrote:

In article <rk63c1dpvr8lcu8vai85tbt0hupt08pemq@4ax.com>, 7+5
@supereva.it says...
"Fred Bartoli"
fred._canxxxel_this_bartoli@RemoveThatAlso_free.fr_AndThisToo> ha

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."

Ah, so a mole of Hydrogen has the same mass as a mole of Uranium. Got
it! ;-)
Click to expand...
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
 
On Tue, 28 Jun 2005 15:45:27 -0400, Keith Williams wrote:

In article <rk63c1dpvr8lcu8vai85tbt0hupt08pemq@4ax.com>, 7+5
@supereva.it says...
"Fred Bartoli"
fred._canxxxel_this_bartoli@RemoveThatAlso_free.fr_AndThisToo> ha

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."

Ah, so a mole of Hydrogen has the same mass as a mole of Uranium. Got
it! ;-)
Click to expand...
Well, you _do_ admit that a gram of gold has the same mass as a gram
of feathers, right?

;-)
Rich
 
In article <pan.2005.06.28.21.12.03.400877@example.net>,
richgrise@example.net says...
On Tue, 28 Jun 2005 15:45:27 -0400, Keith Williams wrote:

In article <rk63c1dpvr8lcu8vai85tbt0hupt08pemq@4ax.com>, 7+5
@supereva.it says...
"Fred Bartoli"
fred._canxxxel_this_bartoli@RemoveThatAlso_free.fr_AndThisToo> ha

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."

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?
Click to expand...
....but not the same number of atoms.

--
Keith
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top