[Lowfer] 8 ft Square Loop
Bill Ashlock
[email protected]
Wed, 30 Oct 2002 16:56:41 -0500
Lewis,
>I used 40 turns center taped to ground on the loop side, and 20 turns >to
>coax back to the shack. I earth grounded the shield.
>The toroid came out of computer Power supply. yellow in color.
That's a powdered iron core and will not offer anywhere near enough
inductance for that application. Look for ferrite cores having a dull black
color (not shinny black). The large beads on power cords and monitor video
cables, typically #43, should work OK. Another good source of cores is
inside AC line filters. The core used as the common mode coke is usually a
#77 core - even better than the #43 in terms of inductance Vs turns on the
core.
Bill A
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