33-HC843

## HC843 

## Multi-Constellation Dual-Band and Iridium Switchable Antenna 

**Frequency Coverage:** GPS L1, L2 | GALILEO E1 | BEIDOU B1 | GLONASS G1, G2 | Iridium + L-Band 

The patented dual-purpose (GNSS and Iridium signal reception) HC843 helical antenna is designed for precision positioning, covering the GPS/QZSS-L1/L2, GLONASS-G1/G2, Galileo-E1, and BeiDou-B1 frequency bands, including the satellite-based augmentation system (SBAS) available in the region of operation [WAAS (North America), EGNOS (Europe), MSAS (Japan), or GAGAN (India)]. The HC843 also passively supports communications over voice and data modems on the Iridium® frequency band (1616.0 - 1626.5 MHz). 

The HC843 is switchable between the passive Iridium and the active GNSS antenna: an input voltage lower than 5.2 VDC engages the GNSS antenna, while an input voltage of 5.5 VDC and above invokes the passive Iridium antenna. 

Weighing only 42 g, The light and compact HC843 features a precision-tuned helix element that provides excellent axial ratios and operates without the requirement of a ground plane, making it ideal for a variety of applications, including uncrewed aerial vehicles (UAVs). 

The HC843 features an industry-leading low current, low-noise amplifier (LNA) that includes an integrated low-loss pre-filter to prevent harmonic interference from high-amplitude signals, such as 700 MHz band LTE and other nearby inBand cellular signals. 

Calian's helical family has passed a rigorous 30-hour vibration test procedure, consisting of five cycles of 2-hour tests per axis (x, y, z): 

- Cycle 1: 1.05 Grms; 

- Cycle 2: 1.20 Grms; 

- Cycle 3: 1.35 Grms; 

- Cycle 4: 3.67 Grms; 

- Cycle 5: 3.67 Grms. 

All Tallysman housed helical antenna elements are protected by a robust military-grade IP69K-compliant plastic enclosure. The enclosure’s base provides three threaded inserts for secure attachment, as well as a rubber O-ring around the outer edge to seal the antenna base and its integrated male SMA connector. 

Mounting instructions available on our product page. 

- Applications Features Benefits • Iridium® voice and data applications • Low noise preamp (3.3 dB typ.) • Extremely light (42 g) • Autonomous uncrewed aerial vehicles (UAVs) • Axial ratio (≤ 0.5 dB at zenith) • Ideal for RTK and PPP surveying systems • Precision GNSS positioning • LNA gain (25 dB typ., 23 dB min.) • Excellent RH circular polarized signal reception • Precision land survey positioning • Low current (GNSS: 23 mA, Iridium: 3.6 mA • Great multipath rejection • Mission-critical GNSS timing typ.) • Increased system accuracy • Network timing and synchronization • ESD circuit protection (15 kV) • Excellent signal-to-noise ratio • Sea and land container tracking • Invariant performance from 2.5 to 16 VDC • Industrial temperature range 

   - Excellent RH circular polarized signal reception 

- Network timing and synchronization • Sea and land container tracking 

   - Industrial temperature range 

- GNSS-mode: 2.5 to 5.0 VDC 

   - Rugged design, ideal for harsh environments 

- Fleet management and asset tracking 

   - Iridium-mode: 5.5 to 16 VDC 

- Marine and avionics systems 

- Law enforcement and public safety • IP69K, REACH, and RoHS compliant 

About Calian: With global headquarters and manufacturing in Ottawa, Canada, Calian is a leading manufacturer of highprecision antennas and components for Global Navigation Satellite System (GNSS) applications. Calian’s mission is to support the needs of a new generation of positioning systems by delivering unprecedented antenna precision at competitive prices. Learn more at www.calian.com/gnss 

Contact us: info.gnss@calian.com T: +1 613 591-3131 

Revision: 202412 

## Multi-Constellation Dual-Band and Iridium Switchable Antenna 

**Frequency Coverage:** GPS L1, L2 | GALILEO E1 | BEIDOU B1 | GLONASS G1, G2 | Iridium + L-Band 

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|||||||||||
|---|---|---|---|---|---|---|---|---|---|
|Antenna|Low Noise Amplifier (LNA)  - Measured at 3V and 25|°|C|
|Technology|Dual-frequency, RHCP quadrifilar helix|
|Frequency Bandwith|Out of Band Rejection|
|Gain|Axial Ratio|
|> 35 dB @ < 1100 MHz|
|Lower Band|1217 - 1255 MHz|
|> 30 dB @ < 1200 MHz|
|dBic typ. at Zenith|dB at Zenith|
|GNSS|L-Band Corr.|-|
|> 36 dB @ < 1400 MHz|
|re|L1|2.2|≤ 0.5|> 40 dB @ < 1500 MHz|
|GPS / QZSS|a|L2|re|2.4|≤ 0.5|Upper Band|1559 - 1626.5 MHz|> 38 dB @ > 1625 MHz > 45 dB @ > 1700 MHz|
|L5|-|-|
|a|ee eee|
|ee|G1|2.6|≤ 0.5|
|GLONASS|a|G2|a|2.1|≤ 0.5|Architecture|Pre-filtered|
|a|G3|a|-|-|Gain|25 dB typ., 23 dB min|
|a|E1|2.2|≤ 0.5|Noise Figure|3.3 dB typ.|
|Galileo|a|E5A|-|-|VSWR|< 1.5:1 typ., 1.8:1 max.|
|E5B|-|-|Supply Voltage Range|GNSS: 2.5 to 5.0 VDC | Iridium: 5.5 to 16 VDC|
|esa|E6|[ee]|ee|-|eeee|-|Supply Current|GNSS: 23 mA typ. | Iridium: 3.6 mA typ.|
|a|B1|a|2.2|eee|≤ 0.5|ESD Circuit Protection|15 kV air discharge|
|BeiDou|a|B2b|ee|-|ee|-|P 1dB Output|11 dBm typ.|
|B2a|-|-|Group Delay|15 ns (L1), 12 ns (L2)|
|es|B3|[ee]|ee|-|ee|-|
|a|ee|
|IRNSS / NavIC|L5|-|-|a|
|eees|L-Band Services (1525 MHz - 1559 MHZ)QZSS|ee|[ee]|L6|eeee|--|eee|--|Mechanical Diagram - Units in 'mm'|
|Satellite Communications|
|Iridium|a|2.5|≤ 0.5|
|Globalstar|a|-|-|
|Other|
|Axial Ratio at 10°|-|Efficiency|-|
|a|ee|<|
|PC Variation|± 3.0 mm (all freq.)|PCO (mm)|30 (L1), 35 (L2)|
|es ee|
|Mechanicals|
|Mechanical Size|44.2 mm (dia.) x 62.4 mm (h.)|
|Weight|42 g|
|Radome|LEXAN™ EXL9330|a|D|44.2|||
|Mount|3x M2.5 screws|3-M2.5|DEEP|6|
|Available Connectors|SMA (male)|
|SMA|Adapter|
|Environmental|ORin|
|Operating Temperature|-40 °C to +85 °C|||
|Storage Temperature|-55 °C to +95 °C|
|VibrationShock|MIL-STD-810-G - Test Method 514.6MIL-STD-810-G - Test Method 516.6|||>.|x|026.6|
|Salt Fog|MIL-STD-810-G - Test Method 509.6|Ordering Information|
|IP Rating|IP69K|
|Part Number|
|Compliance|IPC-A-610, FCC, RED / CE Mark, RoHS, REACH|
|Warranty|
|Parts and Labour|3-year standard warranty|Please refer to our|to review available radomes and connectors at:|

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Ordering Information<br>Part Number 33-HC843<br>**----- End of picture text -----**<br>


Please refer to our Ordering Guide to review available radomes and connectors at: https://at.calian.com/gnss/information-support/part-number-ordering-guide/ 

> © 2025 Calian Ltd. All rights reserved. Calian, the “Confidence. Engineered.” tag line and the Calain logo are trademarks or registered trademarks of Calian Inc. and/or its affiliates in Canada and certain other countries. All other trademarks mentioned in this document are the property of their respective owners. The information presented is subject to change without notice. Calian assumes no responsibility for any errors or omissions in this document. Calian hereby disclaims any or all warranties and liabilities of any kind. 

202412 

Revision: