Portable Antenna Set CG31 Features • Easy set up with captive parts • Long telemetry range - 150 km (93.2 mi) using the RS41 series GPS radiosondes Vaisala Portable Antenna Set CG31 is a portable antenna designed to be used with GPS wind-finding systems. The antenna set consists of a Helix UHF antenna with antenna amplifier and GPS antenna on a tripod. The antenna set is painted green as standard. One person can handle and assemble the antenna set. CG31 receives radiosonde signals in 400 MHz meteorological UHF band. The tripod and the antennas fold compactly for transportation. The transport case is made of polypropene and equipped with wheels for ease of transportation. The transport case also holds an equipment bag, which contains foot pads, pegs, and a hammer. Technical Data Technical Specifications Mechanical Specifications UHF Antenna Diameter Footprint 1133 mm (44.61 in) Type Full-wave Quadrifilar Helix Total height assembled 1695 mm (66.73 in) Frequency 400 … 406 MHz Transportation case dimensions Gain (Elevation angle 25°) 3.5 dBic 1380 × 355 × 385 mm (54.33 × 13.98 × 15.16 mm) Polarization Right-Hand Circular Standard cable length 20 m (65 ft) Horizontal pattern Omni-directional Connector Telemetry Range With RS41 series GPS radiosondes 150 km (93.2 mi) UHF Antenna Coaxial N-type female GPS Antenna Coaxial TNC-type female Weight Amplifier Gain 20 dB typical With cables 10.5 kg (23.15 lb) Noise figure < 2 dB With accessories and transport case 23 kg (50.71 lb) Power input +10 … 12 VDC, typically 130 mA through RF cable Output impedance 50 Ω, VSWR < 1.5 Operating Environment GPS Antenna Operating temperature range -40 ... +55 °C (-40 ... +131 °F) Primary power +5 VDC (±10 %) Operating humidity range 0 ... 100 %RH 22 mA, 0.11 W (nominal) Operating precipitation Unlimited 50 Ω Maximum wind speed 65 m/s (145 mph) Frequency L1 (1575 MHz) Storage temperature -50 ... +71 °C (-58 ... +159.8 °F) Polarization Right-Hand Circular Polarization (RHCP) Storage humidity 0 ... 100 %RH VSWR 2:1 Axial ratio 2 dB at zenith, 10 dB above 10° elevation Gain 35 dB (nominal) Noise 2.75 dB (nominal) Pass-band width 50 MHz Azimuth coverage 360° (omni-directional) Elevation coverage 0° to 90° elevation (hemispherical) Power consumption Output impedance Published by Vaisala | B210687EN-F © Vaisala 2017 www.vaisala.com All rights reserved. Any logos and/or product names are trademarks of Vaisala or its individual partners. Any reproduction, transfer, distribution or storage of information contained in this document is strictly prohibited. All specifications — technical included — are subject to change without notice.