[Lowfer] I need the formula to calculate needed turns on a coil

[Warren Ziegler]

Paul, Andy,

>  You can
> wind 10 turns and check that then wind whatever mulitple of 10 turns to
> get the 2500 uh you want.

    Remembering of course that inductance goes up with the square of
the turns count so 20 turns will have 4x the inductance of 10 turns.

-- 
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1

On Fri, Nov 20, 2009 at 11:38 AM, Paul Daulton <k5wms at centurytel.net> wrote:
> Andy , Ralph W5JGV has provided us with a nomograph to calculate big
> coils . see
> http://w5jgv.com/downloads/indchart.gif  you might want to print this
> and have it laminated
> at a copy shop. you might want to back up one level and see
> http://w5jgv.com/downloads
> and check out all the neat stuff there.
>
> There are several programs like vertload on the internet but the
> nomograph is the easiest to use.
>
>  Best I remember you have one of the AADE inductance meters. You can
> wind 10 turns and check that then wind whatever mulitple of 10 turns to
> get the 2500 uh you want.
>
> Keep us posted on your progress.
>
> Paul k5wms
>
> Quoting Andy - KU4XR <ku4xr at yahoo.com>:
>> Hi all:
>>
>> I hope soon to rewind my LOWfer antenna coil with the #14 soild,
>> in place of the #28 I'm using now. DC Resistance will be lower,
>> which in itself will be another improvement in the overall setup.
>> I'll be using a white paint bucket this time, and probably a
>> white, thin walled PVC for the vari-coil, 4" diameter.
>> To this point, I have been concentrating on antenna, but now I
>> need to begin educating myself on optimum coils, and winding.
>> I admit right up front that my experience in this area is just
>> starting.
>> I do not want to cut the #14 wire " too short " , so I need to
>> know how to calculate the number of turns needed for a particular
>> Inductance. I also don't want to cut it way too long, as this will
>> be waste.  And, for my education, if the inductace needed for #28
>> wire is 2.36 mH at resonance, will it be the same for #14 wire ??
>> That will help me to know this too.
>> Any help you gentlemen will offer will be most appreciated.
>>
>> Thank you and 73 to all :::
>>
>>
>> Andy - KU4XR - EM75xr - Friendsville, TN.
>> LOWfer Beacon " XR " @ 185.29866 KHz ( QRSS-60 )
>> Coordinates:  N:  35* 43' 54" - W:  84* 3' 16"
>> http://www.myspace.com/beaconxr
>>
>>
>>
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>
> Paul Daulton K5WMS
> beacon WMS 187.492 khz qrss30/slow 24/7
> Jacksonville,Ar 72076
> em34wu
>
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-- 
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1