InnovAntennas Delta-C140 Rotary Dipole 40m
Available in 25 days
Top Features
- SWR =< 2:1 (<1.6:1 up to 7.2 MHz)
- Only 12m long
- 89% efficiency
Supply Scope
- Delta-C140 Antenna
- Pole clamp 50mm
Technical description Delta-C140
The Delta-C140 from Innov Antennas is a rotary dipole for the 40m band
with particularly good efficiency. The element length (width) is only
12m.
There are several methods to shorten a dipole, including
extension coils and roof capacitors at the element end. With coils,
position is critical to efficiency - further in the middle at the feed
point is mechanically easier, further out is electrically better.
Justin, G0KSC has used both methods to build the Delta-C140 antenna
robustly and efficiently, limiting the size to a dimension that many
radio amateurs can still install on the mast. The Delta-C140 has coils
in the centre of the radiator halves and roof capacitors at the ends.
The
Delta-C140 dipole does not need any 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 element has a large
diameter of 55mm with 2mm wall thickness in the middle. The thickness
decreases rapidly towards the outside 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-C140
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, due to the relatively long wavelength, a good antenna for 40m
is a challenge, because not everyone has the space to hang a full-length
dipole. Here InnovAntennas offers a very good solution with the
Delta-C140 Rotary Dipole.
Even if the Delta-C140 dipole cannot be
rotated (what wire dipole can be rotated?), this antenna offers an
excellent solution for operation on 40m with relatively small space
requirements. The shortening of the dipole halves is done both by
extension coils and roof capacitors at the ends of the radiator. The
advantage of this design is a very large usable bandwidth of the antenna
- the Delta-C140 can be used over the entire internationally approved
range from 7.0 to 7.3 MHz without having to use a tuner. The SWR is
usually less than 2:1. In the range from 7.0 to 7.2 MHz, the SWR is
usually equal to or better than 1.6:1. The efficiency of the antenna is
89%!
All in all, the Delta-C140 antenna combines a carefully
calculated design with a very robust construction. This is also
supported by the materials used: UV-resistant insulators, seawater-proof
stainless steel elements and aluminium from aircraft construction. The
result is a rotary dipole with high efficiency, which, with a width of
only 12m and a weight of only 8.5 kg, will cause enthusiasm among many
radio amateurs.
| Product Name | Delta-C140 |
|---|---|
| Max. Element Length | 12 |
| Supported Bands | 40m |
| Impedance (Ω) | 50 Ohm |
| Bandwidth (kHz) | 300 kHz (2:1), 200 kHz (1.6:1) |
| Number of connectors | 1 |
| Mono-/Multiband | Monoband |
| Weight | 8.5 kg |
| Brand | Innov Antennas |
| Balun Included | No |
| Max. Power [W] | 3000 W |
| Frequency Range | 7 - 7.3 MHz |
| Rotation Radius [m] | 6.92 |
| Antenna Guying | No |
| Antenna Type | Dipole |
| Design of antenna | Rotary Dipole |
| Antenna mount | Center Mount |
| Max. Mast Diameter [mm] | 50 |
| Connector | Screw Terminal |
| Max. Windspeed (km/h) | 172 km/h |
| Gain [dBi] (free space) | 2.1 |
| Gain 7 MHz [dBi] | 2.1 |
