Was it Brother Dave Gardner?
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of TexasRF@aol.com
Sent: Thursday, October 06, 2005 2:35 PM
To: mattpatt@1starnet.com; aa6eg@hotmail.com; dolanmorrison@tiscali.co.uk;
towertalk@contesting.com
Subject: Re: [TowerTalk] Cable on a reel using a formula?
Who said: pi are round; cornbread are squared?
Circumference= pi times diameter. Length= circumference times number of
turns.
73/k5gw
In a message dated 10/6/2005 2:04:12 P.M. Central Standard Time,
mattpatt@1starnet.com writes:
Isn't the formula pi * radius(squared) * the number of turns what you
need?
Been a long time since I did any geometry...
Matt
----- Original Message -----
From: "Pat Barthelow" <aa6eg@hotmail.com>
To: <dolanmorrison@tiscali.co.uk>; <towertalk@contesting.com>
Sent: Thursday, October 06, 2005 12:22 PM
Subject: Re: [TowerTalk] Cable on a reel using a formula?
>
>>How
>>to calculate the amount of cable on a reel using a formula?
>>Anybody know this formula.
>>GM0LZE
>
> I used to have an Allied Electronics reference guide from the 60s
> That had a formula for big audio inductors where the bobbin
> dimensions(diameter and spool length) the wire diameter were entered
> and it could calculate inductance, resistance....
>
> Hmmm...mebbe a better way...er two better ways...if the cable is
> newly manufactured, it often has foot or metre markers with numbers
> marked on the jacket every
> foot..look at both ends and subtract...but that would be too easy.. so
> probably not an option in your case...
> If Coax, and very long, take a good hi res ohmmeter, short one end,
> and measure the loop resistance and look up the factory loop
> resistance figures for that kind of cable..so
>
> Maybe some old solenoid design engineering formulas can be had to do
> the trick....
>
> Or, Get an MFJ 259B, and connectorize the free spool end, and use the
> legth function of the 259B to calculate the length to the end...
>
> 73, DX Pat AA6EG aa6eg@hotmail.com
>
>
> _______________________________________________
>
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>
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
_______________________________________________
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http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
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