The September/October issue of QEX is out, and it is full of theoretical and practical technical articles that you don't want to miss.

In this issue, Mark Spencer, WA8SME, describes a VLF receiver system that automatically logs received signal data so we can learn about some propagation conditions such as sudden ionospheric disturbances during Solar Cycle 24 in "SID: Study Cycle 24, Don't Just Use It." Phil Anderson, W0XI, gives us a detailed analysis of crystal set receiver circuitry in "A Great Teacher: The Crystal Set." Bertrand Zauhar, VE2ZAZ, brings us another great project that goes well beyond a simple battery charger with his "Rechargeable Battery 'Cycler.'"

Jim Kocsis, WA9PYH, presents "Press-n-Peel Circuit Boards," a simple, reliable way to make your own circuit boards using Techniks, Inc Press-n-Peel Blue etch-resist material. Henry J. Rech offers some thoughts about, "Receiver Performance Measurement and Front End Selectivity," and Frank Witt, AI1H, describes "Optimum Lossy Broadband Matching Networks for Resonant Antennas," in this reprint of an April 1990 RF Design article.

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QEX is edited by Larry Wolfgang, WR1B, and is published six times a year. The subscription rate for ARRL members in the US is $24. For First Class US delivery, the rate is $37 for members, $49 for nonmembers. For international delivery via air mail, including Canada, the subscription rate is $31 for members, $43 for nonmembers. Subscribe to QEX today.