Vaisala CG31 Technical data

Vaisala Portable Antenna Set CG31

Features and benefits

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The Vaisala Portable Antenna Set
CG31 is a portable antenna designed
to be used with GPS wind-nding
systems. The antenna set consists
of a Helix UHF antenna with antenna
amplier and GPS antenna on a
tripod. The antenna set is painted
green as standard. One person can
handle and assemble the antenna set.

The 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.

www.vaisala.com

Easy set up with captive parts

Long telemetry range - 150 km
with RS92-SGP

Vaisala portable antenna CG31 is easy to set up and is well suited for portable
installations.

Technical data

UHF Antenna

Type Full-wave Quadrifilar Helix
Frequency range 400 … 406 MHz
Gain (Elevation angle 25°) 3.5 dBic
Polarization Right-Hand Circular
Horizontal pattern Omnidirectional

Telemetry range

With RS92-SGP radiosonde 150 km

Amplifier

Gain 20 dB typical
Noise figure <2 dB
Power input +10 … 12 VDC,

typically 130 mA through RF cable

Output impedance 50 ohms, VSWR <1.5

GPS Antenna

Primary power + 5 volts DC (± 10%)
Power consumption 22 mA, 0.11 watts (nominal)
Output impedance 50 Ohms
Frequency L1 (1575 MHz)
Polarization Right-Hand Circular

Polarization (RHCP)
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)

Mechanics

Connector

UHF Antenna Coaxial N-type female

GPS Antenna Coaxial TNC-type female
Diameter Footprint 1133 mm
Total height assembled 1695 mm
Weight

With cables 10.5 kg

With accessories and transport case 23 kg
Transportation case dimensions 1380 x 355 x 385 mm
Standard cable length 20 m

Environmental conditions

Operating temperature range -40 ... +55 ºC
Operation humidity range 0 ... 100 %RH
Operating precipitation Unlimited
Maximum wind speed 65 m/s
Storage temperature -50 ... +71 ºC
Storage humidity 0 ... 100 %RH

For more information, visit
www.vaisala.com or contact
us at [e-mail]

Ref. B210687EN-D ©Vaisala 2010

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copyrights retained by Vaisala and its individual partners. All
rights reserved. Any logos and/or product names are trademarks
of Vaisala or its individual partners. The reproduction, transfer,
distribution or storage of information contained in this brochure
in any form without the prior written consent of Vaisala is strictly
prohibited. All specifications — technical included — are subject
to change without notice.