With the DB11, you don’t have to give up performance to fit the antenna into a small space!
The DB11 is the smallest of our Yagi antennas that uses loop technology. This is a distinctive advantage, allowing for a 40% smaller size platform with excellent performance. The DB11 uses an integral coax switch to select which one of the three elements are driven to give equal performance in forward and reverse directions. The control of the Antenna and Coax switch is integrated into the SDA 100 controller for effortless tuning. The DB11 is our only antenna without the optional 6m passive element kit – the spacing of the 3 elements turns out to be ideal for 6m as well.
With two active elements on 20m and three active elements above 20m, an average of 7 dBi of gain (free space), and 20 dB front/rear ratio is obtained on each band.
Weight 63 lb / 28.58 kg *Projected Area 11.08 sq ft / 1.03 sq m Longest Element 19 ft / 5.79 m Turning Radius 10.5 ft / 3.2 m Boom Length 11 ft / 3.35 m Mast Hardware 2.0 in / 5.08 cm Power Rating 3 kW Frequency Coverage 13.95 MHz—54 MHz Cable Requirements 16 conductor 22 ga shielded Tuning Rate 1.33 ft/sec - 0.4 m/sec
Band dBi Gain (Freespace) dB F/R (Freespace) 20m 6.41 19.53 17m 7.02 16.19 15m 7.08 21.35 12 m 7.25 23.17 10 m 7.46 24.55 6 m 8.76 15.09
*Projected area is the total perpendicular surface area measured in square feet/square meters, that is exposed to wind. To calculate wind load you always take the largest projected area whether that is from the perspective perpendicular to the boom or perpendicular to the elements. In the case of SteppIR Yagi’s, the maximum projected area will always be the sum of the surface area’s perpendicular to the Yagi elements. This calculation is a constant number and will not change regardless of EIA specification changes. Do not mistake this projected area calculation as anything more than a data point to present to your structural engineer, tower manufacturer or rotator manufacturer so that they can determine what is necessary for your application.
When sizing an antenna to a tower, many factors need to be taken into consideration including, but not limited to: projected area of antenna in square feet or square meters, weight of the antenna and other items on tower, turning radius, element lengths, antenna height, location exposure category, locations three-second gust wind-speed, locations maximum radial ice loading.
Improper specification of an antenna or rotator to a tower can result in product failure, injury or death. SteppIR is not an expert on tower or rotator sizing and for this reason will never make any kind of a recommendation – this specification process is meant for industry professionals such as a structural engineer, tower manufacturer or rotator manufacturer. Please do not attempt to self-specify our products – the information provided by SteppIR is to be utilized by industry professionals only.