Innov Antennas Delta-C240: 2 Element Yagi for 40m

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Top Features

  • SWR =< 2:1
  • Boom 7m
  • Width 11.5m

Supply Scope

  • Delta-C240 Antenna
  • Mast clamp 50mm

Technical description Delta-C240

The Delta-C240 from InnovAntennas is a 2-element Yagi antenna for the 40m band with particularly good efficiency and a relatively small footprint.

There are several methods to shorten a dipole or elements of an antenna, including extension coils and roof capacitors at the element end. With coils, position is critical to efficiency - further in the middle is mechanically easier, further out is electrically better. Justin, G0KSC has used both methods to build the Delta-C240 antenna robustly and efficiently, limiting the size to one that many radio amateurs can still install on the mast. The Delta-C240 2-element Yagi has coils in the middle of the element halves and roof capacitors at the ends of the elements. The boom length is only 7m and the maximum width is 11.5m.

The Delta-C240 2-element Yagi requires no guy wires! The square boom has an edge length of 60mm and a wall thickness of 2mm, making it very stable even without guy wires. The fact that individual pictures show this antenna with guy wires is the individual decision of the operator, for example because a lot of snow is expected in winter. The construction is designed for heavy loads, so the elements have a large diameter of 50mm in the middle. Towards the outside, the thickness decreases rapidly to save weight, but the ends still have a diameter of 25mm. The coax connection is uncomplicated via screw terminals, without balun. For insulation of the cable we recommend 'Rubbaseal', a liquid rubber coating for cables. The maximum permissible transmitting power is 3000 W.

Application description Delta-C240

The 40 m band is particularly attractive due to its propagation conditions, also and especially for contest participants. Depending on the time of day, both local and international connections are possible. However, a good antenna for 40m is already a challenge due to the relatively long wavelength. A 2-element Yagi antenna for this band, however, is something that can be placed on the mast if it is constructed appropriately. Here InnovAntennas offers a very good solution with the Delta-C240 Yagi.

The Delta-C240 is a compact Yagi for the 40m band with 2 elements. The shortening of the dipole halves is done both by extension coils and roof capacitors at the ends of the elements. The boom length could be limited to 7m. This results in a relatively large, usable bandwidth of approx. 120 kHz with an SWR of =< 2:1. Thus, when mounted approx. 20m above ground, a gain of approx. 10.5 dBi (6.3 dBi free space gain) is obtained. The connection is made via an adjustable "hairpin" feed, which does not negatively affect the usable bandwidth. Enjoy an efficient 40m 2-element beam that is compact enough to fit on the house or mast of many radio amateurs.

Technical Data
Product Name Delta-C240
Brand Innov Antennas
Max. Element Length 11.5
Supported Bands 40m
Bandwidth (kHz) 120 kHz (SWR <= 2:1)
Mono-/Multiband Monoband
Impedance (Ω) 50
Weight (Transport) [kg] 55
Gain 7 MHz [dBi] 10.53
Number of connectors 1
Number of Elements 2
Boom length [cm] 700 cm
Balun Included Yes
Max. Power [W] 3000 W
Frequency Range 7 - 7.3 MHz
Polarisation Horizontal
Rotation Radius [m] 6.92 m
Antenna Guying No
Antenna Type Directional Antenna
Design of antenna Dipole
Strut no
Antenna mount Center Mount
Max. Mast Diameter [mm] 50
Connector Screw Terminal
Max. Windspeed (km/h) 172 km/h
Weight [kg] 50.00 kgs

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