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 Model AH-475 400-550 MHz 11 dBic Gain 


Design Features: The AH-475 uses extended stubs to provide the greater gain while maintaining the wider beam-width. This high-gain low-profile antennas use Circular Polarization Antenna Technology - which delivers better penetration through obstruction and interference. This commercial grade antenna provides superior performance as compare to significantly larger and more expensive products. Our AH series helical antennas are smaller than conventional yagi antenna. The AH-475 Helical Antenna is supplied with a specially designed mounting arrangement for steering the antenna in both planes, over 360 Degrees in Azimuth and 90 Degrees in Elevation for terrestrial and satellite links. Elevation tracking can be done if antenna is mounted on horizontal mast/pole. Broadband design feature of antenna makes it highly suitable for FTS application as FTS ground station antenna without having the requirement of multiple antennas.
Constructions: The AH-475, like all our AH series helical antennas, utilizes circular polarization to minimize the effects of multipath interference. Both Right Hand Circular Polarized (RHCP) and Left Hand Circular Polarized (LHCP) helical antenna models are available. The AH-475 Helical Antenna is light weight, broadband and rugged helical antennas, supplied with high strength fiberglass radome to protect the antenna from environment. Cylindrical enclosure is used for low wind loading and for minimal effect of ice formation on the helical antenna operation as well as providing an aesthetically pleasing appearance. The antenna is designed as per MIL-STD-810G standards.
Array Formation: For higher gain requirement, the Helical antenna can be supplied in DUAL stacked or QUAD stacked arrays formation with suitable power splitter/combiner cable harness. Customized color and customized mounting can also be supplied on request.

Electrical Specifications:
Frequency Range400-550 MHz
Gain11 dBic
Antenna TypeHelix
PolarizationCircular RHCP or LHCP
Input Impedance50 Ohms
Radiation PatternDirectional
Horizontal Beamwidth -Half Power Points55+/-5 Degrees Typical
Front to Back Ratio15+/-1 Degrees Typical
VSWR - Equal To or Better Then2.5:1
RF Power Handling Capacity1500 Watts
Input TerminationN-Female or DIN Female

Mechanical Specifications:
Antenna MaterialsFiber Glass, Copper & SS
Mounting Hardware -MaterialsMarine Grade Stainless Steel
Wind Rating200 KMPH
Overall Length1300 mm
Shipping Length1450 mm
Radiating MaterialHigh Quality Copper
Mounting Clamps PositionAt Rear End of Antenna
Maximum Mount Pipe Diameter 52 mm
Radome MaterialHigh Strength Fiber Glass
Reflector Diameter310 x 310 mm
Gross Weight14 Kgs

Environmental Specifications:
Operating Temperature(-) 30 to +70 Degrees Celsius
Storage Temperature(-) 40 to +80 Degrees Celsius
Humidity0 to 95% RH