[TowerTalk] Cable on a reel using a formula?

[Keith Dutson]

Was it Brother Dave Gardner?

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of TexasRF at aol.com
Sent: Thursday, October 06, 2005 2:35 PM
To: mattpatt at 1starnet.com; aa6eg at hotmail.com; dolanmorrison at tiscali.co.uk;
towertalk at 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 at 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 at hotmail.com>
To:  <dolanmorrison at tiscali.co.uk>; <towertalk at 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 at hotmail.com
>
>
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>
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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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