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Page 7.29, Table 7.35
Figures 18.29 and 18.30 and their captions have been revised and are available for download. (1,515,711 bytes, PDF file)
The PC board templates and Excel spreadsheet with Pi-L calculations mentioned on page 18.33 were omitted from the CD-ROM. These files are available for download.
There are several errors in the text.
Page 18.34, center column. The transformer parts designators are reversed. The low voltage transformer is T3 and filament transformer is T2.
Page 18.34, right column. The low voltage supply provides regulated +12 V and +24 V dc, not +28 V as indicated. Other references to +28 V dc in the text should read +24 V as well.
Page 18.34, right column, last paragraph. References to D101 should read ZD101, which is a 10 V, 1 W Zener diode.
Page 18.35, left column, first paragraph. The current surge resistor is R300 in Figure 18.30, not R308. In addition, the text should note that if R300 fails because the B+ shorts to ground, it may do so with a bang and disintegrate. For safety, the power supply should be fully enclosed in its metal cabinet during operation.
Page 18.36, left column. Table 18.7 shows that 160 meters requires 44 µH, not 42 µH. Also, in one place the output L-coil is referred to as L102. It is L5.
Page 18.36, right column. In the first paragraph, R115 (a potentiometer) is adjusted to obtain full scale, not R114 (a fixed resistor). Also, in the third paragraph, references to D201 should read ZD201, a 3.1 V Zener.
The PI network software may be downloaded from here. It is also bundled in the companion software for the 2004 ARRL Handbook 04hbksw.exe (3.3MB)
