[Antennas] L & C Calculator

Thu, 25 Apr 2002 18:56:40 -0400

Van,

Wow, thanks a gigacycle for these .....What fun... A computer program cannot
let you visualize the relationships like this intuitive device.  Newer is
not always better.

Maybe ARRL would care to print these and make them available ??

----------------------
I did print the Allied one.  I had to make up a local 'web page' (file named
'lca1.html') with the following content:

<img src="alliedLC1.jpg" width="484" height="850">

Made one of these for all four pieces.  Although overly simplistic, this
seemed the easiest way to play with the ratio of the two to get the windows
to align.  I am not an HTML giant and I'm sure there is a neater and sexier
way to do this with html tables.

I then had to play with the relationship of the 'slider' pages with the
front/back ones.  This would probably vary somewhat from PC to PC based on
screen resolution, screen H-W ratio, printer type, browser version, etc....
My system seemed to do best on the Allied one with the front/back at 484/850
and the inner sliders at 440/850.  The Shure ones look a bit different.

After practicing some 'Arts&Crafts 101' skills, I have a working model of
the Allied one.  Nothing to write home about, but great to have.... Thanks a
gigacycle.

There are copyright notices on both these.  Allied is still in business as a
division of Avnet (Dallas area).  Shure was, I believe, was bought by
Motorola many moons ago.  The original Shure building (on  Shure Drive,
Arlington Heights, IL) is now a Motorola property and part of their
Infrastructure group (radio systems and paging/cell switches).

These companies could create some tremendous goodwill by reproducing these
in something durable like plastic or aluminum.  I'm sure all of us would buy
a pair or two, even if they are only used as wall hangings or paperweights.
I'll be on the lookout for these at swaps and garage sales.

73
Frank

<<---  END OF MESSAGE --->>
----- Original Message -----
From: "van lincoln wd8aam" <[email protected]>
To: "A10382" <[email protected]>
Sent: Wednesday, April 24, 2002 9:05 PM
Subject: Re: [Antennas] L & C Calculator

> here you go....evidently the url's are now out of date, and probably
> no longer exist...here is some off my site.
>
> ok, here are the URL's, i put them on my website.  I am NOT making
> them available to everyone, as I have a bandwidth problem.  the size of
these
> files is 6+ megs, and I am only allowed 25 for download a month.
> enjoy, and maybe YOU can pass them along.
> van wd8aam
>
>
> http://www.geocities.com/vlincoln1735/alliedLC1.jpg
> http://www.geocities.com/vlincoln1735/alliedLC2.jpg
> http://www.geocities.com/vlincoln1735/alliedLC3.jpg
> http://www.geocities.com/vlincoln1735/alliedLC4.jpg
>
> http://www.geocities.com/vlincoln1735/shure1.jpg
> http://www.geocities.com/vlincoln1735/shure2.jpg
> http://www.geocities.com/vlincoln1735/shure3.jpg
> http://www.geocities.com/vlincoln1735/shure4.jpg
>
>
> http://www.geocities.com/vlincoln1735/readme.txt
>
> =======================================================================
>
> At 08:11 PM 4/24/02 -0400, you wrote:
> >Hmmm... been trying to open these pages, but no luck.  Is the spelling OK
> >?.....   Is it case sensitive ?....  Is it being bombarded with users
?.....
> >
> >
> ><<---  END OF MESSAGE --->>
> >----- Original Message -----
> >From: "van lincoln wd8aam" <[email protected]>
> >To: "Tom Reid" <[email protected]>; "Tom Bates" <[email protected]>;
> ><[email protected]>
> >Sent: Sunday, April 21, 2002 5:55 PM
> >Subject: Re: [Antennas] L & C Calculator
> >
> >
> >> here you go....from sandy.....
> >>
> >> Reply-To: <[email protected]>
> >> From: "Ron D' Eau Claire" <[email protected]>
> >> To: "Sandy W5TVW" <[email protected]>, <[email protected]>
> >> Subject: GB> Coil and Reactance Calculators
> >> Date: Thu, 13 Dec 2001 12:56:08 -0800
> >> Importance: Normal
> >> Sender: [email protected]
> >>
> >> I just picked up my genuine replica Allied Radio "RF Resonance and Coil
> >> Winding Calculator" to check the tuning range of a circuit and it
reminded
> >> me to say a BIG "Thanks!" to Sandy, W5TVW, for providing the images for
> >the
> >> calculators on his website (the URL's are below).
> >>
> >> When he announced them I took a peek and recognized the Allied one as
> >> something I had many years ago, so just for fun I downloaded the images
> >and
> >> printed it out on my ink-jet printer using 110 pound cover stock. Made
the
> >> slide up of two sheets stuck back to back so it has some real body, and
> >then
> >> fashioned two double thickness 'shims' to act as guides and keep the
> >outside
> >> covers from binding on the slider. Trimmed out the bits with a sharp
> >X-acto
> >> knife and stuck it all together with a glue stick.
> >>
> >> It looked so good that my wife picked it up and said, "Wow! This is a
real
> >> antique!". I had to make her feel for the rivets and see that they were
> >only
> >> images to prove it wasn't 'real'. With the shims running the length of
the
> >> calculator acting as guides for the slider, I suspect that it works
better
> >> than the original with the riveted construction.
> >>
> >> Then I discovered how USEFUL it was. In these days of calculators
pounding
> >> out answers to 6 decimal places, it's really FB to be able to wiggle
the
> >> slide and see in an "analog" way (like my brain works) how the size or
> >turns
> >> of a coil affect its inductance, or simply scan the scale and see what
> >> tuning range my 25-350 pf variable will have with any size of
inductance.
> >>
> >> I went right back and got the Shure calculator too. They are so much
more
> >> friendly and fast to use than my calculator, and the results are as
> >accurate
> >> as anything I need to make a circuit perform like I want it to.
> >>
> >> I'm going to save the images because I can see that I'll wear the ones
I
> >> made out before long. Besides, there's a whole generation of hams who
> >don't
> >> know about them. Seeing a new builder punching in strings of numbers to
> >find
> >> the resonant frequency of a circuit on his calculator, I had to give
him a
> >> set. He was AMAZED at how easy it can be. I'll probably give more
copies
> >> away as time goes on.
> >>
> >> Back in the "pre-calculator" days I found the design of nomographs and
> >> specialized slide rules like this a fascinating mixture of artistry and
> >> engineering. It seems to be an art that has died out under the
onslaught
> >of
> >> digital number crunchers. But that doesn't mean that the digital
machines
> >> are better, or even "as good" as the simpler tools for many purposes.
> >>
> >> Guess that's why telegraph keys are still around too, Hi.
> >>
> >> Ron AC7AC
> >>
> >> Oh... here's the URL's Sandy provided for those images:
> >>
> >>
> >> http://asti.net/W5TVW/alliedLC1.JPG
> >> http://asti.net/W5TVW/alliedLC2.JPG
> >> http://asti.net/W5TVW/alliedLC3.JPG
> >> http://asti.net/W5TVW/alliedLC4.JPG
> >>
> >> http://asti.net/W5TVW/shure1.JPG
> >> http://asti.net/W5TVW/shure2.JPG
> >> http://asti.net/W5TVW/shure3.JPG
> >> http://asti.net/W5TVW/shure4.JPG
> >>
> >>
> >> http://asti.net/W5TVW/readme.txt
> >>
> >>
> >>
> >>
> >> =======================================================================
> >> At 05:29 PM 4/21/02 -0400, Tom Reid wrote:
> >> >I got mine from the ARRL a long time ago
> >> >----- Original Message -----
> >> >From: Tom Bates <[email protected]>
> >> >To: <[email protected]>
> >> >Sent: Friday, April 19, 2002 5:50 PM
> >> >Subject: [Antennas] L & C Calculator
> >> >
> >> >
> >> >> 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]
> >> >> _______________________________________________
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> >> >>
> >> >
> >> >- - -
> >> >
> >> >Your moderator for this list is:
> >> >Larry Wilson KE1HZ [email protected]
> >> >_______________________________________________
> >> >Antennas mailing list
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> >> >
> >> - - -
> >>
> >> Your moderator for this list is:
> >> Larry Wilson KE1HZ [email protected]
> >> _______________________________________________
> >> Antennas mailing list
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> >>
> >
> >
>