Message-Id: <5.2.0.9.2.20041119083121.0133eec0@pop.vianw.pt>
Date: Fri, 19 Nov 2004 08:33:44 +0000
To: rsgb_lf_group@blacksheep.org
From: Brian Rogerson <brian@esoterica.pt>
In-Reply-To: <01C4CE0F.A626D2D0.actalbot@southsurf.com>
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Subject: RE: LF: Loading Coils
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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: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
> > >
> > >
> > >