The November/December 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.

• Tom Apel, K5TRA, describes the construction of 902 and 1296 MHz coaxial collinear antennas with the coaxial elements wrapped into a helix in “A New Horizontal Polarized High Gain Omnidirectional Antenna.”
• Dave Gordon-Smith, G3UUR, presents “The Design of Mixed-Coupling LC Band-Pass Ladder Filters” with third, fourth and fifth order design examples. Tables of normalized design coefficients are included.
• Ian Cowan, VK1BG, describes the steps he took to quiet the RF noise generated by an inexpensive switch mode power supply that he purchased to operate a broadcast receiver and a Yaesu FT-897 Amateur Radio transceiver in “Taming the SMPS Beast.” This article has been picked up from Amateur Radio, the monthly journal of the Wireless Institute of Australia.
• Ralph Gable, WA2PUX, describes the hardware and software he uses with an RS-232 Ethernet adapter and phone patch for “Remote Rig Operation.”
• Ron Skelton, W6WO, examines “Multi-Band Operation of Near-End-Fed Wire Antennas.” This article reports on further research as a follow-up to his March/April 2009 QEX article on near-end-fed wire antennas.
• Ray Mack, W5IFS, introduces an inexpensive DSP development platform, the Texas Instruments TMS320C5535 eZdsp board in his “SDR: Simplified” column. Ray explains how to install the software for this evaluation kit, and describes a basic DDS implementation. Then he shows us how to create a simple FM transmitter using the DSP chip on the evaluation board.

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