January 2005 QST Feedback
In "Hands-On Radio, Experiment #21: The L-Network" [Oct
2004, p 63] the reactance-canceling inductance in the design example should be
0.11 µH, not 0.32 µH, as printed. This is the correct value for 28 MHz.--tnx
KB9WMJ
"A High Quality Speaker System for the Ham Shack" [Oct
2004, p 28-34] had a couple of measurement errors. In Figure 14, the speaker
cutout measurements are incorrect. The 2 inch hole for the tweeter should be 2
1/4 inches from the left side. The 3 7/8 inch hole should be 5 7/8 inches from
the left side. Several readers wondered why the back was smaller than the
front. The back is purposely smaller in size so that the unfinished back edges
do not show against the finished sides and top.
A couple of errors crept into "A 12 V dc Boost Regulator
for Battery Operation" [Nov 2004, p 37]. The schematic (Figure 2, p 38) shows a
solid line drawn from the right side of R7 to ground. That is incorrect; a
capacitor, C14 (220 µF, 16 V) should take its place, with the negative side
connected to ground. The Web site reference schematic is correct (www.arrl.org/files/qst-binaries/boost_reg.zip).
Also, the SCR in the crowbar circuit (Figure 5, p 40) is drawn backward; the
anode and cathode should be reversed--the gate lead is correct.
In "A 10/17 Meter Hanging Loop Antenna" [Oct 2004, p 42],
the materials table (Table 1) should show the 14 gauge wire quantity as 100
feet, not 65 feet. You'll need at least 91 feet of wire to build the antenna.
A cautionary note if you're trying to run the Microsoft
software development tools referenced in "Programming for the Pocket PC" [Dec
2004, p 38]. Various operating systems, including Windows XP, require
you to be logged on as an "Administrator" to run the tools successfully.--tnx
K1EHW
Clarification: 2005 ARRL Handbook Editor Dana Reed,
W1LC, was quoted in "ARRL in Action" [Nov 2004, p 13] as saying, "Every chapter
was updated...[from the 2004 edition]." In fact, many chapters were
updated, and nearly all were revised in compiling the new Handbook.
Page last modified: 03:08 PM, 13 Dec 2004 ET
Page author: qst@arrl.org
Copyright © 2004, American Radio Relay League, Inc. All Rights Reserved.
