The last version of the HamCalc is on my web.
Direct download from:
http://www.qsl.net/ok1rr/files/hamcal94.zip
73 Martin, OK1RR
ok1rr@qsl.net
http://www.qsl.net/ok1rr
----------------------------------------
The difference between theory and practice in theory
is less than the difference between theory and practice in practice.
----- Original Message -----
From: "Terry Dunlap" <kk6t@joneslumber.com>
To: <towertalk@contesting.com>
Cc: "Towertalk" <towertalk@contesting.com>
Sent: Wednesday, March 13, 2002 10:20 PM
Subject: Re: [Towertalk] Measuring/ calculating Inductance
> There was a set of DOS programs around several years back called HamCalc
> which included a program to do that calculation. I'm sure they must still
> be available on the net.
>
> 73 de Terry KK6T
>
>
>
>
>
>
> At 02:40 PM 3/13/2002 -0600, Red wrote:
> >Hi, Steve and all;
> >
> >ARRL handbooks provide formulas and graphs for calculating inductance and
> >designing coils.
> >
> > From the 1994 handbook:
> >
> >"The approximate inductance of a single layer air-core coil....
> >
> >L = d^2 times n^2) ÷ (18 times d + 40 times l)
> >
> >where:
> >L = inductance in microhenrys
> >d = coil diameter in inches (measured to outside diameter)
> >l = coil length in inches (measured to greatest length)
> >n = number of turns
> >(d^2 = d squared and n^2 = n squared)
> >
> >This formula is a close approximation for coils having a length equal to
> >or greater than 0.4d."
> >
> >The handbook presents several graphs and tables to simplify the
> >calculations for coils of selected diameters and turns per inch.
> >
> >Hope this helps.
> >
> >73 de WOØW
> >
> >ve6wz_steve wrote:
> >
> > > I am looking for some advice or references on how to calculate and/or
> > measure the inductance of a loading coil. I have been modelling a
loaded
> > yagi (for 80m) and know the reactance I require for the loading coils,
> > and want to design the coils. I have experimented with a coil on a 6 ''
> > form and have tried to measure the inductance with my MFJ
analyser....the
> > MFJ will not measure over 650 ohms reactance. Is there another way to
> > either accurately measure the inductance or calculate the winding
> > required for "Y" inductance using "X" gauge wire on "X" diameter form?
I
> > realize experimentation will ultimately be required but I'd like to get
> > close on my first design.
> > >
> > > de steve VE6WZ.
> > >
> >
> >
> >
> >_______________________________________________
> >Towertalk mailing list
> >Towertalk@contesting.com
> >http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
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>
>
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