Model SD-312 225 - 400 MHz. 3 dBd. Gain 


Design Features: The SD-312 Aviation Band Antenna is manufactured using high-grade anodized aluminum. Powder coating of the complete aviation band antenna provides extra protection against corrosion in saline weather present in coastal areas. The SD-312 is heavy duty stacked dipole array features, high gain, high power handling capacity, low VSWR, low noise performance and null filling coverage with omni directional characteristics.

Constructions: The SD-312 Stacked Dipole Array consists of TWO folded dipoles stacked vertically, fed in phase. Termination of phasing harness cable sealed by heat shrinking tube making stacked dipole antenna waterproofing. The stacked dipole antenna is suitable for mounting on the top of tower and is supplied with two mounting brackets.

Radiation Pattern: When the TWO dipoles are arranged 180 degrees apart around the central mast, 3dBd. (5.15dBi) omni directional radiation pattern results. Aligning the TWO dipoles collinearly (facing in one direction) a 6dBd. (8.15dBi) offset radiation pattern can be obtained. The radiation pattern can be changed in the field by use of common hand tools.

Electrical Specifications:
Frequency Range 225 - 400 MHz.
Gain3 dBd.
Bandwidth60 MHz.
Antenna TypeDipoles
Input Impedance50 Ohms.
Radiation PatternOmni Directional
Beamwidth -3dB.40 (Vertical)
RF Power Handling Capacity500 Watts.
Input TerminationN-Female

Mechanical Specifications:
Mounting Hardware -MaterialsStainless Steel
Weight Approx7 Kgs.
Wind Rating220 km/Hr.
Overall Length2 Meters.
Support Pipe Aluminum - Outer Diameter. Aluminum 50 mm
Dipoles Aluminum - O.D.Aluminum 12.7 mm
Shipping Length1.8 Meters
Maximum Mount Pipe Diameter 52 mm (2 Inches)
Radiating Elements
- Material
- Cross Section

Aluminum Tube
Round - 12.7 mm O.D.

Environmental Specifications:
Operating Temperature(-)30 to +60 Degrees Celsius
Storage Temperature(-)40 to +70 Degrees Celsius
Humidity0 to 95% RH