Part 1. (For a core of 3.5 in. diam.)

Inductance in Number Length Feet of wire

mil-henries. of turns. in inches. required.

0.10 25 0.46 25

0.16 34 0.63 36

0.20 39 0.72 42

0.25 44 0.81 49

0.40 58 1.07 63

0.60 75 1.38 80

0.80 92 1.70 100

0.85 96 1.78 104

1.00 108 2.00 118

1.20 123 2.28 133

1.80 164 3.03 176

2.00 180 3.33 190

3.00 242 4.48 250

4.00 304 5.62 310

5.00 366 6.77 370

8.00 550 10.20 550

Letters of a Radio-Engineer to His Son · 第 3 / 4 章