On Sat, 15 Jul 2000 12:54:17 -0500 "Phil Clements" <philk5pc@tyler.net>
writes:
.
>Much has been written for the proper size conductor
>to be used in the construction of tank coils, but very little
>data is available for the proper construction of the "L" coil in=20
>a Pi-L network, other than its value. Is there a source for
>this ?
Since the Q is (typically) rather low compared to the PI application,
the circulating current is also reasonable, requiring just a small
increase in wire size.
>The torroid is very popular for this purpose, as it is more
>compact and self-shielding, allowing close-to -chassis mounting.
>Has anyone run any tests on the maximum power handling capability
>of such a coil?
That depends mostly on the core and is easily calculated from the
numbers in a Micrometals (or Amidon) catalog. If you need more power
capability you just stack cores.
>There is probably a formula for a simple "L" coil; given an image
>inductance of 300 ohms and 50 ohms output, but I have never seen
>it.
Yes, there is ...presuming you meant to type impedance immediately
above...
I think you can find it in the Orr Handbook... and probably the older
ARRL books... don't know about the new ones. :-)
Q = Square Root (Rin/Rout -1)
L = Rin / (Q * 2 * Pi * F)
>I guess my bottom-line question is: what would a 9.5 uh 20 amp rated
>"L" coil look like?
Just guessing that this is for 160M... #10 wire should suffice, either
a section of Air-Dux or wound on a toroid.
73,
Marv WC6W
*
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