[AMRadio] coils

[John Lawson]

>
> ----- 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