HC771

When precision matters.®

HC771 Single-Band Helical Antenna
Frequency Coverage:

L1/G1/E1/B1

Overview
The lightweight HC771 helical antenna is designed and crafted for
precision positioning and covers the GPS/QZSS-L1, GLONASS-G1, GalileoE1, and BeiDou-B1 frequency bands, as well as SBAS (WAAS, EGNOS &MSAS).
Weighing only 24 g, the lightweight HC771 features a precision-tuned helix
element that provides excellent axial ratios and operates without therequirement of a ground plane, making it ideal for a wide variety ofapplications, including unmanned aerial vehicles(UAVs).
The HC771 features an industry-leading low current, low noise amplifier(LNA) that includes an integrated low-loss pre-filter to protect against
harmonic interference from high amplitude interfering signals, such as
700 MHz band LTE and other near in-band cellular signals.
The HC771 is protected by a robust, military-grade plastic enclosure withan integrated SMA connector for screw-on mounting that securely seals
the unit with an O-ring, complying with IP67 standards. The enclosure
also provides two threaded holes in the base for secure attachment of theunit.

Applications

FeaturesBenefits• Autonomous unmanned aerial vehicles (UAVs)• Precision GNSS positioning• Precision land survey positioning• Mission-critical GNSS timing• Safety & security• Network timing & synchronization• Very low noise preamp: 2.0 dB typ.
• Axial ratio: : ≤ 0.5 dB at zenith• LNA gain: 28 dB typ.
• Low current: 15 mA typ.
• ESD circuit protection: 15 kV• Invariant performance from: 2.2 to 16 VDC• IP67, REACH, and RoHS compliant• Extremely lightweight (24 g)• Ideal for L1 RTK surveying systems• Great multipath rejection• Increased system accuracy• Excellent signal-to-noise ratio

About Tallysman: With global headquarters and manufacturing in Ottawa, Canada, Tallysman is a leading manufacturer of highprecision antennas and components for Global Navigation Satellite System (GNSS) applications. Tallysman’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.tallysman.com
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Contact us:
info@tallysman.com
T: +1 613 591-3131

HC771 Single-Band Helical Antenna
Frequency Coverage:

L1/G1/E1/B1Antenna

Low Noise Amplifier (LNA) - Measured at 3V and 25°C

Technology

Dual Frequency, RHCP Quadrifilar Helix
Frequency Bandwith
Gain

Axial Ratio

dBic typ. at ZenithdB at Zenith

L13.5

≤ 0.5

L2--

GNSS

GPS / QZSSOut of Band Rejection

1559 - 1606 MHz-Upper Band

Lower Band

< 1500 MHz > 65 dB> 1700 MHz > 65 dB-L5--G12.0

≤ 0.5

G2-

-Architecture

pre-filter → LNA

G3--Gain

28 dB typ. | 26 dB min.

E13.5

≤ 0.5Noise Figure

2.0 dB typ.

E5A-

-VSWR

< 1.5:1 typ. | 1.8:1 max.

E5B--

Supply Voltage Range

2.2 to 12 VDC

E6--Supply Current

15 mA typ.

B13.0

≤ 0.5

ESD Circuit Protection

15 kV air discharge

B2--

P 1dB Output

-

B2a-

-

Group Delay

-

B3-

-

IRNSS / NavIC

L5-

-

QZSS

L6-

---

Iridium--

Globalstar--

Efficiency-

GLONASS

Galileo

BeiDouL-Band Services (1525 MHz - 1559 MHZ)

Mechanical Diagram

Satellite Communications

Other
Axial Ratio at 10°-PC Variation-Mechanicals
33.3 mm (dia.) x 54.2 mm (h.)
SizeWeight (including O-Ring) 24 g
Available connectors

SMA

RadomeRadome and Base: EXL9330

Mount

2 M2.5 screws

Environmental
Operating Temperature-40 °C to +85 °C

Storage Temperature-50 °C to +95 °C

Vibration

MIL STD 810D - 2 hr per axis (X,Y,Z)

Shock-Salt Fog-Ordering Information

IP Rating

IP67 (housing)Part Number

Compliance

IPC-A-610, FCC, RED / CE Mark, RoHS, REACH

33-HC771

Warranty:Parts and Labour

One year (extended warranty available)

Please refer to our Ordering Guide to review available radomes and connectors at:https://www.tallysman.com/resource/tallysman-ordering-guide/© 2019 Tallysman Inc. All rights reserved. Tallysman, the “When Precision Matters” tag line and the Tallysman logo are trademarks or registeredtrademarks of Tallysman Inc. and/or its affiliates in Canada and certain other countries. All other trademarks mentioned in this document are theproperty of their respective owners. The information presented is subject to change without notice. Tallysman assumes no responsibility for anyerrors or omissions in this document. Tallysman Wireless Inc. hereby disclaims any or all warranties and liabilities of any kind.

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