The March/April issue of QEX is coming soon, and it is full of theoretical and practical technical articles that you won't want to miss. QEX is the ARRL’s “Forum for Communications Experimenters.” Published bimonthly, it features technical articles, columns and other items of interest to radio amateurs and communications professionals. The mission of QEX is threefold: To provide a medium for the exchange of ideas and information among Amateur Radio experimenters; to document advanced technical work in the Amateur Radio field, and to support efforts to advance the state of the Amateur Radio art.

Here’s what you’ll find in the March/April issue:

• John Post, KA5GSQ, shows how to use circuit simulation software to determine the gain of positive or negative feedback loops in “On Determining Loop Gain through Circuit Simulation.”
• Arch Doty, W7ACD, discusses “The Effects of Ground Conductivity on Antenna Radials.”
• In “Network Control of the W8ZR StationPro II,” Paul Christensen, W9AC, expands the capability of this powerful device and includes the ability to control it over a LAN or even the Internet.
• Build a SoftRock SDR rig that doesn’t need a PC. Charles Hill, W5BAA, shows how he did it in “SDR2GO: A DSP Odyssey.”
• John Roos, K6IQL, describes a way to keep an old frequency standard useful in “Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a Low Spurious Frequency Doubler.”
• Maynard Wright, W6PAP, provides another installment in his series of tutorials on the use of the free Octave mathematics program in “Octave for L Networks.”

Would you like to write for QEX? It pays $50/printed page. Get more information and an Author’s Guide here. If you prefer postal mail, send a business-size self-addressed, stamped envelope to QEX Author’s Guide, c/o Maty Weinberg, ARRL, 225 Main St, Newington, CT 06111-1494. QEX is edited by Larry Wolfgang, WR1B, and is published bimonthly. The subscription rate (6 issues) for ARRL members in the US is $24. For First Class US delivery, it’s $37; in Canada and internationally by airmail it’s $31. Nonmembers add $12 to these rates. Subscribe to QEX today.