The 2D-30A is a 2-driven-element array for the 30 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.
The antenna is designed to reach the maximum allowable
stress for the aluminum material at an actual airspeed across the elements in the worst
case direction of 106 Miles Per Hour (MPH). We rate the elements to survive exposure to an
airspeed of 100 MPH. This rating does not take ice loading into account.
Elements: Aluminum, 6061-T6.
Accessories: Aluminum, Steel, PVC, Acrylic
Element Diameter: Elements taper from 1.875 inches to
Element length: Front, 46.5 feet; Rear, 49.2 feet
Element sag: Front, 14.5 inches; Rear, 15.9 inches
Turn Radius: 25.3 feet
Weight: 54 pounds, including mounting plates and hardware
Rated Power: 1.5KW CCS, 3KW ICAS
Feedpoint Impedance: Adjustable to exactly 50 Ohms
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.
180 KHz For 1.4:1 VSWR
450 KHz For 2.0:1 VSWR
720 KHz For 2.6:1 VSWR
Gain: 6.5 dBi minimum (free space), over the entire 30
Meter Amateur Band.
4.3 dBd (relative to full size dipole at same height)
This number has been verified by actual measurement.
Front to back ratio: 20 dB
Takeoff angle: 28 degrees when mounted at the 46 foot
recommended height. See patterns and associated notes.
Vertical Beamwidth: 33 degrees; -3dB 13 and 46 degrees
when mounted at the 46 foot recommended height. See patterns
and associated notes.
Horizontal Beamwidth: 74 degrees
Note: Please see patterns and graphs for more information.
Note: CAL-AV reserves the right to make
and implement design improvements without notice.
Specifications updated: 4/24/00
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