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SHOUT ts User’s Manual Version 1.0.1

| Appendix C: Power Consumption

The SHOUT ts has an internal 1.95 A-Hr Li-Ion rechargeable battery. When both

the Iridium and GPS antennas have clear view of the sky and the battery is fully

charged, the ts is capable of sending more than 1,500 tracking reports with the

following settings: (1) report rate of less than two hours, and (2) mailbox check

rate and the report rate are the same. Blocked or partially blocked antennas will

force the ts to retry multiple SBD transmissions for each report and, as a result,

can significantly reduce the overall number of reporting cycles.

The ts saves valid ephemeris data after each 3-D fix. The data is used to reduce

acquisition time in the next reporting cycle from cold-start to hot-start. If the

ephemeris data is older than two hours (time between reports is set for more

than two hours), the GPS receiver will go through cold-start each time it wakes up

to send a report. As a result, the ts configured for report rate of more than two

hours can only send ~1300 tracking reports.

IMPORTANT: Data presented here are only estimates and are highly dependent

on the operating environment and antenna type. Data are based on

measurements made with multiple ts devices placed on the roof of NAL

Research’s facility with no blockage.

Each time the ts wakes up to send a report, it has two minutes to acquire a GPS

fix and send an Iridium SBD message. Assuming the ephemeris data is valid (less

than two hours old or time-between-reports is less than two hours), the GPS

receiver takes about 10 seconds for a position fix drawing approximately 55mA.

The Iridium transceiver takes about 10 seconds to transmit an SBD message

drawing an average current of 110mA. The ts circuit draws about 125mA during

25-second reporting cycle. The entire reporting cycle consumes ~1.32 mA-Hr of

battery power. If the Iridium antenna is blocked or an overhead Iridium satellite is

not available, the Iridium transceiver can potentially stay on for another 100

seconds in attempting to send a report. This results in additional consumption of

9.7 mA-Hr or 11 mA-Hr total. A missed report consumes ~8.5 times more power

than a ‘normal’ transmitted report.

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