The DIP-40A is a rotatable dipole for the
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).
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
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
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
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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