Slide show


Bological researchers often tag animals with electronic data loggers that transmit data to Argos system satellites orbiting the Earth. These devices are typically activated just before they are attached to whales,bears, birds, etc. Before attaching the tags the researchers need to know if the transmitters are working. AO designed the Argos Uplink Receiver to test the tags before they are deployed.


The instrument consisted of a UHF receiver, demodulator and digital data detection circuit. It operated from battery power or an external AC power module and was packaged in a small, attractive and rugged metal case that fit easily in a briefcase. A removable antenna connected to a jack on the front panel. A LED bar graph signal strength indicator displayed received signal strength. An earphone jack with volume control and squelch allowed the operator to listen for Argos transmitter output. A RS-232 serial data output connected to a computer for data transfer.

Alpha Omega provided a program to display received data on a computer. It listed all Argos transmitters that were being received and displayed the data stream from each in real time.


The Alpha Omega Argos Uplink Receiver performed well and was a popular product. Delivery stopped when production of key components ceased. A replacement unit is being planned.