Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

RE: LF: Loading Coils

To: [email protected]
Subject: RE: LF: Loading Coils
From: Brian Rogerson <[email protected]>
Date: Fri, 19 Nov 2004 08:33:44 +0000
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
The slide rule generation all did it to place the decimal correctly?
Brian CT1DRP




At 08:13 19/11/2004, you wrote:
When it comes to calculations, the most useful ability is not to be able to
caculate it exactly, caculator or no, but to quickly be able to estimate a ball
park answer or approximation.

Who needs to know that  22uH at 137kHz has 18.93 ohms reactance.

Its quicker to think  " a bit more than 20 times a bit less than 0.14, times
 6-and-a-bit
...    is  2.8 times 6-and-a-bit ,  so call it 18 ohms"

And they don't teach that in schools - and never have done, to my knowledge!

Andy  G4JNT



On Friday, November 19, 2004 4:01 AM, WE0H Mike [SMTP:[email protected]]
wrote:
> Yes, you have to know what buttons to push to get the right answer. The
> calculator just helps you to not make as many mistakes if any at all.
>
> Mike
> WE0H
>
> G4gvw wrote:
>
> >I must confess that after all these years i do find that my calculator with
> >
> >all the built-in formulae (ohms law included) has made me lazy but maybe the
> >
> >skill is in knowing what to calculate and when
> >
> >Pat g4gvw
> >
> >
> >




<Prev in Thread] Current Thread [Next in Thread>