Tallysman’s new antennas designed for Iridium STL signals

January 4, 2021  - By
Photo: Tallysman

Photo: Tallysman

Tallysman Wireless has introduced two lightweight and compact active Iridium helical antennas designed to receive Iridium Satellite Time and Location (STL) signals.

The signals are used by STL terminals to provide worldwide position, navigation and timing independent of GPS/GNSS via an encrypted satellite broadcast signal that is strong and secure and can also be received indoors.

Because GNSS signals may be jammed (intentionally or accidentally) and spoofed, STL signals are a reliable alternative to augment and authenticate time for applications, such as electrical grids, wireless communications networks and financial systems, as well as position for private and public infrastructure.

The housed HC610 and embedded HC610E active Iridium antennas operate in receive-only mode and enable Iridium terminals to be installed tens of meters away from the antenna.

Photo: Tallysman

Photo: Tallysman

Both antennas are light and compact and feature a precision-tuned helical element that provides an excellent axial ratio and operates without a ground plane. They also feature a low-current, low-noise amplifier (LNA) and pre-filter to prevent harmonic interference from high-amplitude signals, such as 700-MHz band LTE and other nearby in-band cellular signals.

The housed HC610 weighs 23 grams, is 33 x 54.2 mm, and features an IP67 robust, military-grade plastic enclosure, with a base-mounted male SMA connector and two screw holes for surface attachment.

At 10 grams, the embedded HC610E is 27.5 x 38.7 mm and can be installed in a custom enclosure. It provides a base-mounted female MCX connector. An optional embedded helical mounting ring is available to attach the antenna to a flat surface.

Tallysman also provides support for the installation and integration of embedded helical antennas to enable successful implementation and to ensure optimal antenna performance.

About the Author: Tracy Cozzens

Senior Editor Tracy Cozzens joined GPS World magazine in 2006. She also is editor of GPS World’s newsletters and the sister website Geospatial Solutions. She has worked in government, for non-profits, and in corporate communications, editing a variety of publications for audiences ranging from federal government contractors to teachers.