Is the ideal solution for those who want an antenna working both for 11m and 10m (27 and 28 MHz), with great gain, for small space (has no boom) and low weight.
The SmarTech 278DL1 can be mounted with very few operations and is suitable for both fixed and portable installations.
Unlike fiberglass structures, aluminum systems give a considerable duration and better response to wind loads. This allows to keep "intact" the antenna geometry (shape) and avoid sudden changes of impedance and decay of efficiency and general performances.
In addition, the antennas of this type allow to reach particularly low take off angles: key feature especially for long distance DX, via the ionosphere.
Delta Loops develop all over the joint with the mast and therefore tend to suffer much less soil losses. Furthermore the antenna is also little affected by close disturbing objects.
Considering the same support, Delta Loop antennas result to be (electrically) higher than a Yagi.
Thanks to the work of study, prototyping and optimization by SmarTech Technical Division, the 27DL1 is manufactured with the finest materials to ensure the best electrical and mechanical efficiency.
SmarTech Deltaloop Antennas are designed to reach the best possible configuration of Forward Gain, F/B Ratio, F/S Ratio and Radiation Solid Clearence becouse of design resulting combinations are not affected by the 50 ohm native impedance constraint.
Therefore once the best antenna configuration is reached, a specific gamma match system provides the perfect 50 ohm impedance for the maximum power transfer and for the maximum system efficiency.
The antenna main structure is made of aluminum alloy EN AW-6060/82 UNI 9006/1 (Anticorodal 60/100), which provides excellent long-term durability against the most severe weather (ice, water, UV rays, fine particles, acid rain), and better resistance to heavy wind load.
The Delta Loop is supplied with stainless steel parts AISI 304 (Inox Austenitic UNI / EN 10088) and steel S235JR2 (UNI 100 series), certified according to 2000/53 / CE + RoHs standards.
Insulators are made of Polypropylene PPC 5660, resistant to remarkable thermic excursions (certified for temperatures from -20°C to +130°C), with high load at break (ultimate tensile strength 25Mpa), excellent abrasion-resistant and volume resistivity > 1018
The horizontal wire is one of the most important components of the antenna. Here flows the highest current and RF radiation is maximum. Therefore the quality of the material most determines the system efficiency.
For this, SMARTECH has focused its utmost care and efforts for the production of a specific, special wire consisting of 99.99% pure copper with antioxidation coating and insulated with a special polymer.
The wire is also used for military and aerospace applications because of its excellent dielectric properties (insulation better than glass), abrasion and tear resistant, UV rays resistant, chemical solvent attack resistant. IDT 8 kV. Operating temperatures -65+150°C.
The antenna is made to obtain the maximum electrical efficiency, the best mechanical resistance and durability, thanks to its high quality materials. It is also suitable for installation in mountain areas and coastal (corrosive) areas.
SmarTech antennas are designed with the minimum necessary electrical/mechanical joints. So, parasitic resistances are the lowest possible so as to minimize unwanted RF dissipations.
In order to maintain its best performances, each Delta Loop is individually checked before shipment.
|Gain||8.66 dBi @9m (29.5 ft)
8.87 dBi @15m (49.2ft)
|Power rating||3 kW (optional 5 kW)|
|VSWR min. @50 ohm||1.0:1|
|Matching Method||Gamma Match|
|3 dB Horizontal Beamwidth||84° @9m (29.5ft)
84° @15m (49.2ft)
|PHYSYCAL AND MECHANICAL SPECIFICATIONS|
|Projected area [F=Flat - C=Cylindrical]||0,28m² - 1,88ft²|
|Rotation radius||1.7m (5.6ft)|
1 el. DELTA LOOP - 27/28 MHz (278DL1)
- Brand: SmarTech Innovations
- Product Code: 278DL1