[Antennas] L & C Calculator

Sun, 21 Apr 2002 16:30:26 -0400

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
>> 
>> - - - 
>> 
>> Your moderator for this list is:
>> Larry Wilson KE1HZ [email protected]
>> _______________________________________________
>> Antennas mailing list
>> [email protected]
>> http://mailman.qth.net/mailman/listinfo/antennas
>
>- - - 
>
>Your moderator for this list is:
>Larry Wilson KE1HZ [email protected]
>_______________________________________________
>Antennas mailing list
>[email protected]
>http://mailman.qth.net/mailman/listinfo/antennas