[AMRadio] coils

[KB2WIG at twcny.rr.com]

Sand??   Doesn't this make it solid state???  klc

----- Original Message -----
From: John Lawson <jpl15 at panix.com>
Date: Sunday, January 8, 2006 9:21 pm
Subject: Re: [AMRadio] coils

> 
> 
> >
> > ----- Original Message ----- From: "Edward B Richards" 
> <zuu6k at juno.com>>> 
> >> I am going to wind a pi section tank coil from 1/4" copper tubing
> >> tomorrow. Mine will be 4" in diameter and 3" in diameter. Which 
> tubing is
> >> best (no kink) thick or thin? Thanks.
> 
> 
>   A trick to making smooth bends in soft metal tubing, is to fill 
> it with 
> fine sand first.
> 
>   Now - I understand this can be tedious with long lengths of 
> small-diameter stock, but if you have no other mandrels or 
> fixtures to 
> wind it on, sometimes this can help from developing a kink in the 
> pipe.
>   Then, you can blow the sand out, or just leave it in there - 
> won't hurt 
> the electrical specs of the coil...
> 
>   Cheers
> 
> John  KB6SCO
> 
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