Subminiature L-Band Satellite Data Terminal

This is a subminiature terminal with a digital I/Q interface for a separate modem board (not shown). The single-board construction includes all analogue, power supply and RF subsystems (except antenna) required for a small, low-power L-band satellite communications terminal.

Subminiature Satcomms Terminal

The board was originally designed with partial funding from the European Space Agency to provide an RF platform for a proof-of-concept prototype of a proposed subminiature Inmarsat BGAN terminal.

The board has since evolved into a more generic subsystem intended for low-power, low-rate data terminals. Major features are:

Efficient class-C HPA delivering 5dBW (TDD, less than 50% duty cycle) into the antenna. This is suitable for constant-envelope modulation only. The balanced amplifier is tolerant of extreme antenna mismatch without the risk of damage or instability.
Effective power management. Standby current less than 100uA. An on-board real-time clock allows the terminal to wake up during predefined slots.
Wide-range DC power input, with on-board battery pack for stand-alone operation. Suitable for direct connection to vehicle supplies, solar panels etc.
On-board GPS receiver.
Mounting points and power supply for customer's modem card fitted to top of board in above images.
Provision for either external antenna or integrated flat panel antenna (fitted to reverse of board).
Low-cost construction. Chemically milled screens (not shown) directly soldered to board reduce external screening requirements.

This board is optimised for low-power, low-rate terminals using constant-envelope modulation in the return path. For a more versatile system capable of higher data rates and with a choice of HPA technologies see our miniature terminal.

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