[Antennas] L & C Calculator

Sun, 21 Apr 2002 19:52:58 -0400

ARRL now freely (and free) distributes programs to calc the lc for a loaded
dipole (shortened).  They used to supply these on a CD-ROM with the ARRL
handbook, but now make them available on their web site ( www.arr.org ).

73 Frank

<<---  END OF MESSAGE --->>
----- Original Message -----
From: "Dave Fouchey" <[email protected]>
To: <[email protected]>
Cc: "Hare,Ed, W1RFI" <[email protected]>
Sent: Sunday, April 21, 2002 4:30 PM
Subject: Re: [Antennas] L & C Calculator

> Mike the ARRL actually had two versions that I know of, have them both and
> no neither is for sale!<G>, one was the large circular one you refer to
and
> the other was a more classic "slide rule" type. Not sure WHY they stopped
> making them but I sure wish they would return them to production.
>
> Ed, I  hate to drag you into a discussion from another list but any
> comments on these?
>
> 73's
> Dave
> WA4EMR
> Sterling Heights, MI
>
> At 11:41 AM 4/21/2002 -0500, Mike J Maloney wrote:
> >Tom, The best was the "ARRL Lightning Calculator", a circular calculator,
> >that not only did F, L, and C, but also did coil calculations.   Other
> >than from a vintage radio list, or ebay, I wouldnt know how to come up
> >with one.  The one I have is a laminated XEROX version, sent me by
> >someone years ago as a request.   I would give $15-20 for an original in
> >clean working condition.      If it is just L, C and Freq you are
> >interested in, you can memorize the constant 25330.
> >Divide this constant by Freq (MHz) squared and you have the LC product
> >for that freq.    Divide by known L or C to get unknown.   If you know
> >the L and C, divide the LC product into 25330 and the square root of the
> >answer is the Freq. in MegaHertz.
> >
> >73, Mike, ac5p
> >(the above constant works  for L in uH, and C in pF).
> >
> >On Fri, 19 Apr 2002 17:50:09 -0400 "Tom Bates" <[email protected]> writes:
> >> Greetings...
> >>    Anyone know where I can find one of those old cardboard slide
> >> rule calculator
> >> gadgets which was used to find L, C, or Res Freq when 2 of the 3
> >> variables were
> >> known ?  I think Allied used to sell them years ago.
> >>    Thanks es 73,   Tom   AA1NZ
> >>
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