Two Direction Beverage Antenna System using twisted pair wire, 300 ohm Ladderline, or surplus Military WD-1A Field Wire
Radioware and KD9SV have announced a new simplified Beverage antenna system kit. The kit includes an optimized feed and reflection transformers and can be used with either a custom manufactured “Twisted Pair Wire,” 300 Ohm ladder line available from Radioware or Military surplus WD1 or WD-1A Field Telephone Wire. Conceptually, the design is similar to other two wire designs using “ladder line” but is greatly simplified for ease of use and installation. This antenna is great for those who can only install receiving antennas during the winter season. In the spring, the antenna can be wound up on a hose reel for re-installation come fall. It is also robust enough for a permanent installation.
This new design also offers the ultimate in installation simplicity while providing excellent front-to-back ratios and the advantage of receiving from two directions from one simple antenna.
The Feed Transformer and Reflection Transformer are designed with bi-filar windings for extremely good balance utilizing the popular binocular type ferrite cores and optimized impedance matching. The transformers are also encapsulated with polyurethane and plastic box for complete weather protection.
Twisted Pair shown in above diagram can be 300 ohm Ladder Line, Twisted Pair Wire, or WD1 Twin Lead Zip Cord, dependent upon selection of Feed and Reflection Transformers. See ordering below. Schematic from NCJ.
Installation is simple and easy. Two feed lines go from the feed point transformer at the near end for direction selection thereby eliminating the need for relays to change directions. At the far end, the wires are connected to the reflection transformer. For best operation, the unused direction should be terminated with a 75 ohm resistor and this can be easily done at your antenna selection box.