## PSN-L Email List Message

**
Subject: RE: Coil winding formula ?**

From: RLLaney@.......

Date: Mon, 24 Jul 2000 12:16:02 EDT

Arie:
The following formula is taken from the ARRL Amateur Radio Handbook and is
for the inductance of a single-layer air-core:
L = d(squared) n(squared) / 18d + 40 l
L = inductance in microhenrys
d = coil diameter in inches
l = coil length in inches
n = number of turns
Notation in connection with the use of this formula says that this formula is
a close approximation for coils having a length equal to or greater than 0.4d.
There are formulas for winding loop antennas that take into account the wire
diameter.
Hope this information is helpful.
Bob Laney
Herndon, VA
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Larry Cochrane <cochrane@..............>