---
title: Nano-Satellite Voice-Enabled Communications
type: technology
url: "https://www.envisioning.com/research/apogee/australia-nz__satellite-voice-communications"
hub: apogee
summary: "Fleet Space demonstrated satellite-enabled Push-to-Talk voice for the Australian Defence Force on the world's smallest known voice-capable satellite — Centauri-4 weighing just 6kg."
---

# Nano-Satellite Voice-Enabled Communications

Fleet Space demonstrated satellite-enabled Push-to-Talk voice for the Australian Defence Force on the world's smallest known voice-capable satellite — Centauri-4 weighing just 6kg.
- Technology Readiness Level: 6/9
- Impact: 2/5
- Investment: 3/5
Fleet Space Technologies demonstrated satellite-enabled Push-to-Talk (PTT) voice communications for the Australian Defence Force's ASCEND2LEO program using its Centauri-4 satellite — at 6kg, the world's smallest known satellite capable of voice relay. The demonstration proved that nano-satellites could provide tactical communications capability in areas without terrestrial network coverage, relevant for both military operations and remote civilian applications across Australia's vast interior.

Australia's geography — a continent the size of the contiguous United States with a population concentrated on the coasts — creates enormous communications dead zones in the interior. Military operations, mining activities, pastoral stations, and emergency services in these areas currently depend on expensive HF radio or satellite phones. Nano-satellite voice relay at the cost point enabled by Fleet Space's constellation could democratize satellite communications access.

For defense applications, the ability to provide secure voice communications through an Australian-built and operated satellite constellation offers sovereignty advantages over reliance on foreign-owned systems (Iridium, Inmarsat). The ASCEND2LEO program explicitly aims to develop Australian sovereign space communications capability, with nano-satellites offering rapid constellation deployment and replacement at costs orders of magnitude lower than traditional military communications satellites.

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Source: Envisioning — Technology Research Institute (https://www.envisioning.com/research/apogee/australia-nz__satellite-voice-communications)