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Power Supply Handbook -- Gain the knowledge and confidence you need to build and use power supplies. A must have for your bookshelf!

ARRL's Vintage Radio -- Articles about the lure of vintage Amateur Radio gear.

The Electronics of Radio -- Temporarily Out-of-Stock! -- This advanced-level textbook uses the practical approach of making a real ham rig (the NorCal 40A) to teach radio electronics.

Hints & Kinks--17th edition -- Now including the popular Hands-On Radio column from QST Workbench.

ARRL's RF Amplifier Classics -- Turn dreams of constructing your first amp or next brick into reality!

Feedback - April, 2003 QST

In "The Doctor is IN" [Mar 2003, p 56], the photos captions are missing. The top left photo is Figure 2A, the top right is Figure 2B, the bottom left is Figure 3A and the bottom right is Figure 3B. The captions should read as follows:

Figure 2A----Modulation (square-wave) that results from an unfiltered key line.

Figure 2B----A shaped and filtered square-wave keying signal.

Figure 3A----Key clicks caused by unfiltered keying result in a wide noise spectrum.

Figure 3B----A filtered keying line reduces these spurious signals noticeably.

In the Hints and Kinks column [Mar 2003, p 67] the caption for Figure 2 should read "A pair of finished termination resistors."