Iridium 9601 Product Developer Manual page 20

Iridium Satellite LLC
9601 SBD Transceiver Product Developers Guide
V1.24 120505
dependant upon the phase of the mismatch. For power critical applications a good antenna and cable will
be required.
(C) Background operating current: Whenever the 9601 is turned on the nominal supply current will be
70mA.
(D) Receiver data burst: The receive data burst current pulse is 14mS long, and is initially 200mA, rising
to 247mA for the last 5mS, as the 9601 turns on various parts of the receiver, to capture the data burst
from the satellite.
Figure 12 shows an oscilloscope plot of a single frame:
Both traces are zero referenced on the first graticule line from the bottom of the plot. The upper trace is
the 5V supply rail measured at the Test Interface Connector (TIC) box. The power supply was set for 5.5V
and configured for remote sensing, which gives rise to the voltage overshoot at the end of the transmit
burst.
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Figure 12 Single Frame Current Profile for the 9601
The scales for the above plot are:
Time base
Current (Yellow trace)
Voltage (Red trace)
10mS / cm
0.5A / cm
1V / cm
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