Model AH-405 380-430 MHz 11 dBic Gain 
 

HELICAL ANTENNA

Design Features: The AH-405 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. The AH-405 helical antenna is highly suitable to provide the uninterrupted communications in the tunnels. 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-405 Helical Antenna is supplied with a specially designed mounting arrangement to hold the antenna at back end by using two stainless steel mounting brackets to withstand the higher wind rating. Optional: A mounting arrangement to support the antenna from front end can also fixed to handle the high wind pressure created by high speed trains. Both LHCP and RHCP models are available.
The part number for LHCP version is AH-405-LHCP and AH-405-RHCP is for RHCP version.
Constructions: The AH-405, like all our AH series helical antennas, utilizes right hand circular polarization to minimize the effects of multipath interference. The AH-405 Helical Antenna is heavy duty, 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. Optional: Two drain holes can be provided at the bottom surface of helical antenna enclosure.

Electrical Specifications:
Frequency Range380-430 MHz
Gain11 dBic
Bandwidth380-430MHz
PolarizationCircular - LHCP or RHCP
Input Impedance50 Omhs
Radiation PatternDirectional
Horizontal Beamwidth -Half Power Points45 Degrees
Front to Back Ratio16 dB.
VSWR1.5:1
RF Power Handling Capacity500 Watts
Input TerminationN-Female

Mechanical Specifications:
MaterialsCopper, Fibeglass & Aluminum
Mounting Hardware -MaterialsMarine Grade Stainless Steel
Wind Rating200 Km/Hr.
Overall Length1400 mm
Shipping Length1450 mm
Radiating MaterialHigh Quality Copper
Maximum Mount Pipe Diameter 38-60 mm (1.5-2.25Inches)
Radome MaterialHigh Strength Fiber Glass
Radome Outer Diameter260 mm
Radome Length1300 mm
Gross Weight12 Kgs.

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