User manual

Revised 14 June 2003

A-1

Appendix A

Specifications for 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 innovative 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:

Materials:

Elements: Aluminum, 6061-T6.

Accessories: Aluminum, Steel, PVC, and Acrylic

Size:

Element Diameter: Elements taper from 2.500 inches to 0.375 inches

Element Overall 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

Wind survival (no ice): 100MPH (85 Knots)

Electrical Specifications:

Operating Bandwidth:

For 2.6:1 VSWR: 295 kHz (36% of the range is below F

and 64% is above)

For 2.0:1 VSWR: 206 kHz (39% of the range is below F

and 61% is above)

For 1.4:1 VSWR: 94 kHz (45% of the range is below F

and 55% is above)

Minimum VSWR: Set to 1.0:1 at F

Gain: 6.5-dBi minimum (free space), 11.9 dBi (approximately -

NEC2 model) when array tuned for F

= 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

Horizontal Beam width: 74 degrees

Note: Please see APPENDIX B, ‘PATTERNS AND GRAPHS” for more

information.

Note: Cal-Av Labs, Inc. reserves the right to make and implement design

improvements without notice.