A21 and A31 Antennas

Product catalog summary

Key Features:
The document provides technical specifications for GNSS antennas, specifically the A31 and A21 models, designed to maintain tracking of multiple satellite systems including GPS, GLONASS, BeiDou, Galileo, and SBAS. Both antennas are equipped to handle challenging environments with features like improved multi-path mitigation and superior noise rejection.

Specifications:

GNSS Reception: Supports GPS L1, GLONASS G1, BeiDou B1, Galileo E1, SBAS, L-band, and Beacon.
Frequency Range: 1.525 to 1.614 GHz for GNSS and L-band; 283.5 - 325 KHz for Beacon.
LNA Gain: 30 dB with noise levels below 2.0 dB.
Power Input: Voltage range of 5 to 12 VDC with current between 50 - 60 mA.

Mechanical and Environmental:

Enclosure: A31 uses Lexan, while A21 has an aluminum base with ASA plastic top.
Dimensions and Weight: A31 measures 10.4 H x 14.5 D cm and weighs 0.73 kg; A21 measures 7.0 H x 13.0 D cm and weighs 0.38 kg.
Temperature Range: Storage from -40°C to +85°C and operating from -30°C to +70°C.
Enclosure Rating: IP69K for both models, ensuring protection against dust and high-pressure water.
Shock and Vibration: Compliant with EP455 standards.

Recommendations:
The antennas are recommended for use with Hemisphere GNSS Crescent and Crescent Vector II receivers, offering enhanced performance in environments with electrical noise and multi-path interference.

Catalog excerpts

GPS, Glonass, BeiDou, Galileo, SBAS and L-Band Antenna GPS, Glonass, BeiDou, Galileo, SBAS, L-Band and Beacon Antenna GNSS Sensor GNSS Sensor GNSS Reception: GNSS Frequency: LNA Gain: LNA Noise: GPS L1, GLONASS G1, BeiDou B1, Galileo E1, SBAS, and L-band 1.525 to 1.614 GHz 30 dB 2.0 dB, typical Dimensions: Weight: Mount: RF Connector: Aluminum base with ASA plastic top 7.0 H x 13.0 D (cm) 2.9 H x 5.1 D (in) .38 kg (.84 lbs) 5/8 inch female thread TNC (straight) Environmental Storage Temperature: Operating Temperature: Enclosure Rating: Shock and Vibration: Beacon Frequency: Beacon LNA Gain: Power Input Mechanical Enclosure: L-Band Frequency: L-Band LNA Gain: Beacon Sensor Power Input Input Voltage: Input Current: GNSS Frequency: LNA Gain: LNA Noise: GPS L1, GLONASS G1, BeiDou B1, Galileo E1, SBAS, L-band, and Beacon 1.525 to 1.614 GHz 30 dB < 2.0 dB L-Band Sensor L-Band Sensor L-Band Frequency: L-Band LNA Gain: GNSS Reception: The A21™ antenna is designed to help maintain tracking of GPS, GLONASS, BeiDou, Galileo, and differential correction signals in challenging environments. Sometimes keeping the antenna level and away from electrical noise is just not possible. With a metal base, lower profile, improved multi-path mitigation, and ability to filter out an additional 30 decibels of radio band frequencies, A21 offers superior noise rejection. The A21 is designed for use with Hemisphere GNSS Crescent® and Crescent Vector™ II receivers. Input Voltage: Input Current: Mechanical Enclosure: Dimensions: Weight: Mount: RF Connector: Lexan 10.4 H x 14.5 D (cm) 4.1 H x 5.7 D (in) .73 kg (1.62 lbs) 1” coarse thread (5/8” adapter available) TNC Environmental Storage Temperature: Operating Temperature: Enclosure Rating: Shock and Vibration: The A31™ antenna is designed to help maintain tracking of GPS, GLONASS, BeiDou, Galileo, Beacon, and differential correction signals in challenging environments. Sometimes keeping the antenna level and away from electrical noise is just not possible. With improved multi-path mitigation and ability to filter out an additional 30 decibels of radio band frequencies, A31 offers superior noise rejection. The A31 is designed for use with Hemisphere GNSS Crescent and Crescent Vector II receivers.

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A21 and A31 Antennas

A21 and A31 Antennas

Catalog excerpts

All Hemisphere GNSS catalogs and technical brochures