Mike,

shouldn't your formula be as follows:

f=0.159 over the square root of l times c?

Didn't you just take the reciprocal of the 2 times pi which would be 0.159 
to get it out of the denominator?

If you use 0.159 the answer would be 1590000 hertz which is of course, 1.59 
million or 1.59 megahertz?

Not trying to stir up trouble, just didn't look right to me.

73's

Howard #3, W A 9 Y B W


----- Original Message ----- 
From: "Mike Cozzolino" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, January 16, 2012 11:20 PM
Subject: Re: requesting help with math question


> hello scott, i tried to follow your formula, but the way you wrote it
> i couldn't follow it.  anyway scott, why don't you use the formula >>
> f=159 over the square root of l times c <<.  first you multiply the l
> times c and then you get the square root of that answer.  then you
> take the 159 and devide that by your answer.  the answer i got using
> the values you gave, 50 microhenries and 200 pico farads was 1.59.  i
> left the values at their original values picos and
> microhenries.  thats the formula i always use for resonance of a
> tuned circuit.  73 bl c u mike w6quv
>
>
>
> At 07:06 AM 1/16/2012, you wrote:
>>All,
>>
>>Ok, I'm studying away here and trying to master the material for the =
>>Extra class exam. I have to admit that my math skills are not the best, =
>>but in my defense I have not done such fun stuff when in school and =
>>certainly never took much algebra. So, I'm admitting my mathematical  =
>>ignorance  here and asking for a little mercy. grin
>>I want to understand how best to work out these problems because =
>>remembering the answers is probably almost as much work. grin
>>So, here is the question and this is dealing with resonance.
>>The forumla f sub r =3D r squared times l squared.
>>So, f is the resonant frequency and I got that and that is what I need =
>>to solve for.
>>So, r is 50 micro henrys and l is 200 pico farads.
>>I understand that I need to convert micro henrys to henrys and pico =
>>farads to farads. I gather multiplying 50 times 10 to minus 6 gets the =
>>job done and doing this on a calculator would be 50 times 10 (press the =
>>x y button) -6.
>>You would do the same for converting pico farads to farads.
>>However, at this point I'm not quite sure how to work out the rest and =
>>of course entering this into a scientific calculator is really important =
>>and would make the process a bit easier.
>>I realize the end result will be an answer that is in megahertz. If =
>>anyone could help with this I would really appreciate it. The electrical =
>>theory portion of the exam is going to be the difficult part for me. =
>>RUles etc. no problem, but this stuff which I'm sure is going to be a =
>>big part of the exam is going to be the make or break for me.
>>
>>thanks,
>>73
>>Scott/N3BYY=