March 2009 QST Feedback
In “Old Amplifiers — Boat Anchors or Bargain Basement Opportunities?” [Jan 2007, pp 37-41], Figure 3 shows the ac circuit breakers in the wrong place. It shows them to be in the main ac line, which would require different values of circuit breakers when switching between 120 and 240 V ac power. The circuit breakers should be on the other side of the voltage selector strip, thus placing them in one of the individual transformer primaries, not the main ac line that feeds both primaries. The connections shown were in early Heath literature, later corrected by them and used in newer manuals. Thanks to Lon W. Cottingham, K5JV, for the information.
In “Experimenter’s RF Spectrum Analyzer” [Oct 2008. pp 36-40], capacitors C1 and C3-C5 are indeed 0.1 µF, as shown in the schematic.
In “Hints & Kinks” [Jan 2009. pp 79-80], Steve Taber, W4ITD, reports that the 12 gauge ladder line in his “Feed Line Stretcher,” does not appear to be available. He has found that currently available 14 gauge line works fine instead.
Page last modified: 09:51 AM, 04 Feb 2009 ET
Page author: qst@arrl.org
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