Message-ID: <01C4CE0F.A626D2D0.actalbot@southsurf.com>
From: Andy <actalbot@southsurf.com>
To: "'rsgb_lf_group@blacksheep.org'" <rsgb_lf_group@blacksheep.org>
Date: Fri, 19 Nov 2004 08:13:26 -0000
Importance: high
Organization: UKNWN(UK)
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Subject: RE: LF: Loading Coils
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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:we0h@genesiswireless.us] 
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
> >
> >
> >