Vaisala RM32 Technical data

Vaisala Telemetry Antenna RM32

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Features and beneﬁts

Radiation pattern optimized for

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radiosonde reception

Easy installation

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Long telemetry range

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– 200 km with RS92-SGP

High elevation angle coverage

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– improved data availability

The Vaisala Telemetry Antenna RM32 is an omnidirectional UHF antenna used with the Vaisala DigiCORA Sounding System to receive radiosonde signals in the 400 MHz meteorological band.

RM32 has two antenna-elements which have been selected to optimize the performance in all elevation angles, both near the horizon and at the zenith. The sounding system selects the antenna with the best reception through a two position antenna switch. The operating

telemetry range with the Vaisala RS92-SGP radiosonde is up to 200 km.

RM32 is well suited for ﬁxed installations, but it can also be used in portable systems, when feasible. The mounting sleeve at the bottom of the tubular stand makes it easy to install the whole antenna assembly on top of an external mast. All the ampliﬁer parts are housed in a watertight box at the base of the antenna mast. The ampliﬁer runs on DC voltage, supplied by the UHF receiver.

Technical data

General

Frequency range 400 … 406 MHz Vertical antenna

Directivity 5 dBi Polarization Vertical Horizontal pattern Omnidirectional

Helix antenna

Gain 3dBic Polarization Right-hand circular Horizontal pattern Omnidirectional with

hemispheric coverage

Telemetry range

With RS92-SGP radiosonde 200 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

Mechanics

Cable connector Coaxial N-type male Total height including mast 1760 mm Inner diameter of mounting sleeve 61.5 mm Weight 11.4 kg with the feeder cable

6.3 kg without the cable

Standard cable length 33 m

Environmental conditions

Operating temperature range -40 ... 55 °C Operating humidity range 0 … 100 %RH Operating precipitation Unlimited Maximum wind speed 65 m/s

For more information, visit www.vaisala.com or contact us at sales@vaisala.com

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