HT-2D Choke Ring Antenna
The choke measuring antenna meets the needs of highprecision measure-ment and multisystem compatibility for measurement equipment. Widely used in CORS stations set up, land surveying, seismic monitoring, moni-toring of landslides, bridges and other highprecision measurement of de-formation monitoring applications.

Features
■ The antenna part of the multi-point design and fully symmetrical antenna structure, phase center accuracy to millimeter level, and the phase center of high stability, good repeatability;
■ The use of 2D choke coil design, to achieve excellent multi-path suppression effect;
■ The antenna low elevation gain, high altitude satellite signal tracking ability, to ensure that the system has enough number of satellites;
■ LNA part of the pre-filter design, effectively suppress the band interference signal, to avoid causing the amplifier saturation, improve system reliability;
■ Built-in lightning and voltage regulator circuit, the effective protection of the amplifier to ensure that the normal work in harsh environments;
■ Shell with high reliability of the engineering plastics, using the overall waterproof design,waterproof rating IP67, to ensure that the antenna can work outdoors for many years.

Specifications
Antenna indicators
Frequency Range:
-GPS: L1,L2,L5
-GLONASS :L1,L2
-BD2:B1,B2,B3
-Galileo:E1,E5a,E5b,E6
-Impedance:50Ω
Polarization mode: right-handed circular polarization
The antenna axial ratio:≤3dB
Horizontal coverage angle:360°
Output standing wave:≤1.5
Vertex gain:≥5dBi
Phase center error:±1mm
Environmental
Working Temperature: -55°C to +85°C
Storage Temperature: -55°C to +85°C
Working storage humidity:95% (no condensation)
Low-noise amplifier index
Gain:50dB
Noise figure:≤2dB
Output standing wave:≤2
Operating Voltage:3.3~18VDC
Operating Current:≤55mA
Differential transmission delay:≤5ns
Structural properties
Size :Φ322×240mm
Connector Type: TNC-K
Bottom installation method:5/8"-11UNC
Weight: 5000g