CAL-AV Labs, Inc.

Quality Engineering Solutions Since 1959

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Specifications DIP-40A


The DIP-40A is a rotatable dipole for the 40 meter amateur band. It is an unloaded, full size element. It will be noticeably quieter than a vertical, and when mounted at the same feedpoint height, will exhibit both higher efficiency and more gain than an inverted vee.

It is constructed of multiple sections of 6061-T6 aluminum tubing. Successively smaller sections are used from the center toward the tips of the element, resulting in a tapered element. A mounting plate and hardware which allow mounting the dipole on a 2" mast are supplied with the antenna. (Mounting plates for mounting the antenna on other sizes of masts are available from the factory.) The mounting plate includes insulators which electrically isolate the split element from the mast mounting plate. A BALUN for coaxial cable feed is supplied with the antenna. The BALUN incorporates a UHF receptacle for connection of the coax's UHF plug (e.g. a PL-259).

Physical Specifications

Wind Survival

The antenna is designed to reach the maximum allowable stress for the aluminum material at an actual airspeed across the element in the worst case direction of 106 Miles Per Hour (MPH). We rate the element 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


Element Diameter: elements taper from 2.50 inches to 0.375 inches

Element length: 73.58 feet

Element Sag: 32.35 inches

Turn Radius: 36.8 feet

Weight: 63 pounds, including mounting plates, hardware, and supplied (0.5lb) EB-1 BALUN

Projected Area: 11.51 square feet

Electrical Specifications

Rated Power: 3W CCS, 5KW ICAS

Gain: 2.15 dBi, 0 dBd; (this is a full-size dipole)

Feedpoint Impedance: Approximately 73 Ohms

(This applies only at resonance and recommended height above local earth. Both resonant frequency and the resistive component of the feedpoint impedance are affected by the height above ground. See VSWR Graph showing theoretical variation in these parameters over frequency for various mounting heights.)

VSWR Bandwidth: 2.0 to 1 or less over 460 KHz

The antenna may also be fed with 50 ohm feedline. If it is, then the minimum VSWR when mounted at the recommended height will be 1.5 to 1.

Note: Please see patterns and graphs for more information.

Note: CAL-AV reserves the right to make and implement design improvements without notice.

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