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 Model HL-225-400 225 - 400 MHz 10 dBic Gain 


Design Features: The HL-225-400 UHF Aeronautical Band helical antenna uses extended stubs to provide the greater gain while maintaining the wider beam-width. This high-gain antenna 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 HL-225-400 helical antenna is smaller than conventional yagi antenna. The HL-225-400 Helical Antenna can be 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.

Constructions: The HL-225-400 UHF aviation band helical antenna, 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 HL-225-400 UHF Aero Band Helical Antenna is light weight, broadband and rugged helical antennas, supplied with 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.

Array Formation: For higher gain requirement, the Helical antenna can be supplied in DUAL stacked or QUAD stacked arrays with suitable power splitter/combiner cable harness.

Electrical Specifications:
Frequency Range225 - 400 MHz
Gain10 dBic
BandwidthEntire Band
Antenna TypeHelical
PolarizationCircular - LHCP or RHCP
Radiation PatternDirectional
Horizontal Beamwidth -Half Power Points50 Degrees
Front to Back Ratio16 dB.
VSWR - Equal To or Better Then2.5:1
RF Power Handling Capacity500 Watts
Input TerminationN-Female

Mechanical Specifications:
Antenna MaterialsFiber Glass & Copper
Mounting Hardware -MaterialsMarine Grade Stainless Steel
Wind Rating200 KMPH
Overall Length1200 mm
Shipping Length1400 mm
Radiating MaterialCopper
Maximum Mount Pipe Diameter 60 mm
Radome MaterialFiber Glass
Radome Outer Diameter260 mm
Radome Length1200 mm
Gross Weight14 Kgs.

Environmental Specifications:
Operating Temperature(-) 30 to +70 Degrees Celsius
Storage Temperature(-) 40 to +80 Degrees Celsius
Humidity0 to 100% RH