Specifications 2D-40A
Description
The 2D-40A is a 2-driven-element array for the 40-meter amateur band. It features full size elements, an internal phasing line, and an
patented integral BALUN feed system. This beam has gain comparable to a 2-element Yagi, and a front-to-rear ratio comparable to a 3-element Yagi.
Physical Specifications
Wind Survival (no ice): 100MPH (85 Knots)
Materials
Elements: Aluminum, 6061-T6
Accessories: Aluminum, Steel, PVC, and Acrylic
Size
Element Diameter: Elements taper from 2.50 inches to 0.375 inches
Element length: Front, 66.2 feet. Rear, 70.2 feet
Element sag: Front, 27.9 inches. Rear, 30.6 inches
Turn Radius: 36 feet
Weight: 163 pounds, including mounting plates and hardware
Projected area: 16.8 square feet
Electrical Specifications
Rated Power: 1.5KW CCS, 3KW ICAS
Feedpoint Impedance: Adjustable to exactly 50 Ohms
Operating Bandwidth
The VSWR bandwidth will be approximately as follows when
measured at the antenna terminals. Measurements made at the transceiver end of the
feedline may show wider bandwidths than these.
For 2.6:1 VSWR: 295 kHz (36% of the range is below F0 and 64% is above)
For 2.0:1 VSWR: 206 kHz (39% of the range is below F0 and 61% is above)
For 1.4:1 VSWR: 94 kHz (45% of the range is below F0 and 55% is above)
Minimum VSWR: Set to 1.0:1 at F0
Pattern
Gain: 6.5-dBi minimum (free space)
11.9 dBi (approximately - NEC2 model) when array tuned for F0 = 7.1 MHz and
mounted 70 ft (21 meters) above local earth.
Front to rear ratio: 20-dB minimum
Takeoff angle: 26.5 degrees
Vertical Beam width: 33 degrees -3dB 13 and 46 degrees.
See patterns
and associated notes.
Horizontal Beam width: 74 degrees
Download
the 2D-40A Manual Adobe Acrobat file.
(Manual updated 2003
Jun 24)
Specifications updated: 2001 Aug 29
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