Tallysman Introduces Active Helical Antennas for Iridium STL Signals

Tallysman Wireless has introduced two new lightweight and compact active Iridium helical antennas: the housed HC610 and the embedded HC610E.

The HC610 and HC610E are designed to receive the Iridium Satellite Time and Location (STL) signals. These antennas can be used by STL terminals to provide worldwide position, navigation and timing information independent of GPS/GNSS via an encrypted satellite broadcast signal. Since 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 including private and public infrastructure.

The HC610 and HC610E are active Iridium antennas that operate in receive-only mode and enable Iridium terminals to be installed tens of metres away from the antenna. 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 (24 g) is 33 mm wide and 54.2 mm long. It features IP67 protection with a robust, military-grade plastic enclosure, a base-mounted male SMA connector and two screw holes for surface attachment. The embedded HC610E (10 g) is only 27.5 mm wide and 38.7 mm and can be installed in a custom enclosure. It also 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 for optimal antenna performance.