In my article "When Will the Bands Improve?" [Jul 2006, p 46] the definition of the length of a sunspot cycle should read: "The average length of a sunspot cycle, from solar minimum with a minimum number of sunspots (low electron density) to solar maximum with a maximum number of sunspots (high electron density) and then back down to the next solar minimum, is approximately 11 years." -- Carl Luetzelschwab, K9LA

In "Homebrew Solid-state 600 W HF Amplifier [Jun 2006, pp 39-43] R3 and R4 in Figure 1 should be omitted. The resulting bleeder current is 1.1 A; the value in the text is in error for either configuration.

Update: In the "A CAT5 Cable and Connector Tester" [Jul 2006, pp 52-53] the CAT5 crimping tool listed in the article, #115-1321 is no longer available. The correct item number is #115-2158.

In my article, "A Neat Dual Band Antenna" [Aug 2006, pp 50-51] the "upper aluminum tube" length in Figure 4 should be 22 1/8 inches as shown correctly in Figures 2 and 3. -- Geoff Haines, N1GY

Clarification: The impressive AO-40 satellite dish on the cover of the August 2006 issue was built and installed by Jerry Brown, MØMOE/K5OE, at his home in Houston. (He now lives in London, UK.) "The dish," he writes, "is a surplus 4 foot UHF TV antenna (from the '60s) with a homebrew L/S dual-band feed. The two cross-Yagis (V/UHF) are PVC pipe and copper wire using a folded-dipole feed from a satellite-specific design I presented at the AMSAT-UK Colloquium in 2000. The two boxes contain coaxial relays for switching antenna polarizations on the V/UHF antennas."

Clarification: In the sidebar, "Power Measurement and the Alpha Power 4510" in the July 2006 issue [Product Review, p 63], power is defined more precisely as the quantity of work performed per unit of time. -- tnx Doug Smith, KF6DX, and Jon Tandy, K9KNC